954 results about "Catalytic transformation" patented technology

The invention relates to the technical field of biological catalysis, and discloses an L379A mutant enzyme for preparing rebaudioside I. The enzyme is obtained by the following mutations generated by UGT76G1: leucine of the 379th amino acid sequence is mutated into alanine; the enzyme can be applied to RA in-vitro conversion preparation of RI with higher utilization value, the conversion rate is higher than 50%, and the enzyme activity is remarkably improved by 7 times compared with the original enzyme catalytic conversion enzyme activity. The UGT76G1 mutant disclosed by the invention has the advantages that (1) the blank is filled, and a special enzyme catalyst capable of realizing efficient in-vitro synthesis of rebaudioside I (RI) is provided for the first time; 2) efficiency jump: the catalytic conversion rate is greatly increased from original about 7% to more than 50% (increase gt; and 3) stability and reliability: in the cross-scale reaction of 10mL to 5L, the catalyst has stable catalytic performance, shows excellent industrial application potential, and is suitable for popularization and application.

An article for joule heating is described, including a three-dimensional substrate on and / or in which a pyrolyzate of a phenolic resin or polymer forms an electrically conductive carbon network. Such articles may be incorporated in structured materials applications, which may include support, sorbent, and or catalyst components. Also described are methods of fabricating such articles and structured materials, and apparatus comprising same, and methods of use of such articles and structured materials and apparatus for conducting material transformation processes requiring input of heat for their performance, such as CO2 adsorption, methane pyrolysis for hydrogen and carbon production, hydrogen-assisted conversion of CO2 to hydrocarbons, including catalytic conversion of CO2 to olefins, catalytic conversion of CO2 to propane (liquefied petroleum gas), and catalytic conversion of CO2 to renewable natural gas, reverse water gas shift reaction, steam ethane cracking, propane cracking, steam methane reforming, and dry methane reforming.

The invention relates to a fly ash-based MOFs adsorption-catalysis material integrated preparation method, and belongs to the field of solid waste treatment and resource utilization. The material takes industrial solid waste fly ash as a matrix, and is prepared by the following steps: firstly, carrying out alkali modification and silane coupling agent surface activation treatment on fly ash to form a high-activity matrix; then loading a metal organic framework (MOFs) on the surface of the activated fly ash through an in-situ synthesis process to form a porous composite carrier; the integrated material with CO2 adsorption and catalytic conversion functions is further prepared through impregnation of a copper-based active component and a high-temperature calcination process. According to the invention, the problems of high energy consumption, high cost and low comprehensive utilization rate of fly ash of the traditional CO2 capture and utilization technology (ICCU) are solved, high-valued resource utilization of industrial solid waste and efficient capture and conversion of CO2 are synchronously realized, and the method has dual values of environmental protection and economy.

The invention discloses an anode material for adipic acid monoester electrolysis and a preparation method of the anode material, the electrode solves the key problems that a platinum layer is easy to fall off, the catalytic activity is low, the organic matter poisoning resistance is poor and the like of a traditional titanium platinum-plated electrode through multi-scale interface strengthening and nano structure regulation and control; the preparation method comprises the following core steps: constructing a porous ZrO2-TiO2 composite oxide layer on the surface of a titanium substrate by adopting a micro-arc oxidation-hydrothermal composite process, and generating platinum nanoparticles in situ to pre-fill pores, so that the anchoring effect of a platinum layer is remarkably enhanced; depositing a platinum / carbon nano tube (Pt / CNT) composite catalyst layer on the surface of the oxide layer through a pulse-ultrasonic synergistic electroplating technology, wherein the carbon nano tube is used as a conductive framework to inhibit platinum agglomeration; through vacuum annealing and electrochemical activation treatment, the interface bonding force and active site exposure are further optimized; the electrode shows excellent performance in an adipic acid monoester electrolysis system, and efficient electrocatalytic conversion from adipic acid monomethyl ester to dimethyl sebacate is achieved.

Systems and methods for implementing protections against catalytic converter theft. A vehicle may comprise Ultra-Wideband (UWB) anchors or sensors. The UWB sensors of a vehicle may be used to detect the relative distance and / or location of UWB-capable devices in close proximity to the vehicle. An assessment may be performed using the UWB anchors and / or other sensors to determine whether the presence of the unknown device is indicative of a threat to the vehicle. If a threat is detected, one or more protection steps may be taken.

The invention relates to the field of biomass energy and chemical industry, in particular to an efficient methanol preparation method based on biomass graded catalytic conversion and cycle coupling. The method comprises the following steps: in a graded catalytic oxidation reaction system, mixing a biomass raw material with a composite vanadium-based catalyst, water, oxygen and circulating methanol for reaction to generate a gas-liquid mixture containing methyl formate; recycling methyl formate by using a gradient variable-pressure rectification separation system; carrying out an interface hydrogenation reaction under the action of a copper-zinc-LTA hierarchical pore catalyst to generate methanol; finally, part of methanol is purified and recycled through membrane separation. The method realizes efficient conversion from biomass to methanol, has the advantages of mild reaction conditions, low energy consumption, high yield and good catalyst stability, and opens up a new path for industrialization of preparation of methanol from biomass.

Method for calculating NH3 and NOx concentrations downstream from an SCR system of an internal combustion engine (E) of a vehicle by means of a statistical module, the method comprising the following steps: using temperature measurements acquired upstream (T1) and downstream (T2) of the Selective Reduction Catalyst (SCR) as first input variables and NOx mass flow measurements acquired upstream (N1) and downstream (N2) of the SCR as second input variables; calculating an NH3 concentration downstream from the SCR catalytic converter as a function of the first and second inputs.

An electrically conductive circuit has a distal end coupled to a catalytic converter of a vehicle. A sensor such as a voltage divider is coupled to a proximal end of this conductive circuit. The voltage divider senses when a resistance associated with the conductive circuit is altered, indicative of catalytic converter tampering. An alarm signal can then be sent to the vehicle horn or otherwise beneficially outputted to warn of the tampering. The conductive circuit preferably includes a length of nichrome wire having a substantial resistance. Reliable electrical connection and tampering avoidance can be provided at the distal end of the nichrome wire by utilizing an electrically conductive washer at the distal tip, covering the nichrome wire with high temperature insulating tape, overlying the tape with a pipe clamp and encapsulating the washer, distal end of the nichrome wire, insulating tape and pipe clamp with a high temperature bonding adhesive.

The invention belongs to the technical field of gene engineering, and particularly relates to fusion vitamin D hydroxylase and application thereof in preparation of 25-hydroxy vitamin D2 and 25-hydroxy vitamin D3. The fusion vitamin D hydroxylase comprises a Vdh-K1 heme structural domain of which the amino acid sequence is shown as SEQ ID NO.1, a CYP116B65 redox structural domain of which the amino acid sequence is shown as SEQ ID NO.3, and a linker for connecting the Vdh-K1 heme structural domain and the CYP116B65 redox structural domain. The fusion vitamin D hydroxylase is a self-sufficiency enzyme, and can realize stable catalytic conversion of vitamin D2 and vitamin D3 on the premise of not depending on an Fdx and Fdr assisted electron transfer system.

Exhaust assemblies for vehicles and methods of installing exhaust systems on vehicles are disclosed. An exhaust assembly for a vehicle includes an exhaust inlet to receive combustion products from a drive unit, a catalytic converter to control emissions from combustion products received by the exhaust system, and a first piping assembly coupled to the exhaust inlet and the catalytic converter.

The invention relates to the field of nano materials and electrochemical technology materials, in particular to a melamino-formaldehyde / MXene composite material, a derived carbon material thereof, a preparation method and application. According to the preparation method disclosed by the invention, MXene is taken as a substrate, and protonated melamine formaldehyde molecules are inserted into MXene layers through an electrostatic self-assembly effect, so that the melamine formaldehyde / MXene composite material is synthesized; and carrying out high-temperature calcination on the basis to prepare the melamine formaldehyde / MXene composite material derived carbon material. According to the invention, active sites for adsorption and catalytic conversion of iodine species are provided while self-stacking of MXene is solved, and the melamine formaldehyde / MXene composite material is used as the positive electrode material of the aqueous zinc-iodine battery, so that the iodine species can be effectively anchored, and the active sites for catalytic conversion of iodine are fully provided; the reversibility and the structural stability of the electrode reaction are enhanced, so that the electrochemical performance of the battery is greatly improved.

The invention discloses a NiCu-based alloy catalyst for preparing high-value products through natural gas decarbonization and application of the NiCu-based alloy catalyst, and belongs to the technical field of natural gas high-value catalytic conversion. The preparation method of the NiCu-based alloy catalyst comprises the following steps: (1) adding nickel nitrate hexahydrate and urea into hot water, adding ethylene glycol, carrying out a stirring reaction at 120-150 DEG C, and calcining the obtained intermediate to obtain a nickel oxide precursor; (2) adding a copper nitrate aqueous solution and ammonia water into the nickel oxide precursor, so that copper ions are anchored on the surface of nickel oxide, drying and calcining to obtain a Ni-Cu alloy oxide precursor; and (3) adding the Ni-Cu alloy oxide precursor, bismuth trioxide and metallic tin into deionized water, adding a complexing agent, carrying out ultrasonic treatment, and carrying out H2 reduction calcination on the obtained precipitate to obtain the Ni < x > Cu < y > Bi < z > Snm alloy. The NiCu-based alloy catalyst is used in a natural gas decarburization high-value product preparation reaction, and the natural gas decarburization reaction is sufficient, and long-term efficient conversion and stable operation are achieved by combining the synergistic effect of ultrasonic waves and an alternating magnetic field.

The invention discloses a preparation method of a nano-porous CeO2 catalyst, and the preparation method of the nano-porous CeO2 catalyst comprises the following steps: S1, adding a cerium source into deionized water, and dissolving to obtain a cerium-containing aqueous solution; s2, adding a mixed solvent into the obtained cerium-containing aqueous solution, and uniformly stirring to obtain a mixed solution; s3, putting the obtained mixed solution into a reaction kettle for hydrothermal reaction, after the reaction is finished, centrifugally washing to obtain a solid substance, and then sequentially drying, conventionally grinding and calcining the obtained solid substance at high temperature to obtain the nano-porous CeO2 catalyst. The invention also provides a nano-porous CeO2 catalyst, and an application of the nano-porous CeO2 catalyst. Compared with the prior art, the preparation method of the nano-porous CeO2 catalyst has the advantages that the operation is simple, and the prepared nano-porous CeO2 catalyst has a good catalytic conversion effect on VOCs (Volatile Organic Compounds) and the like.

The invention discloses an integrated hydrogen-ammonia engine tail gas nitrogen pollutant thermocatalytic conversion device, and relates to the technical field of hydrogen-ammonia engine tail gas treatment, the integrated hydrogen-ammonia engine tail gas nitrogen pollutant thermocatalytic conversion device comprises a shell and an electric control unit; the shell comprises a component detection device, an electric heating type mixing plate, a urea solution spraying device, a temperature monitoring device, a purification device and an electric control unit; the purification device comprises a two-section type structure, namely a first-section SCR reaction area and a second-section ASC-NDC integration area; the electric control unit is electrically connected with each electric component; according to the invention, sequencing optimization and integrated design of hydrogen-ammonia engine parts are realized, and the requirements of triple-effect collaborative purification of nitrogen pollutants, high efficiency, energy conservation and stable operation under all working conditions are met.

The invention relates to the technical field of lignin separation and catalytic conversion, in particular to a method for separation and in-situ catalytic conversion of lignin in woody biomass, which comprises the following steps: (1) mixing the woody biomass, a catalyst and a reaction solvent, and performing catalytic reaction to obtain a liquid product and a solid product; wherein the catalyst comprises a tungsten element, a phosphorus element and a carrier; (2) evaporating the liquid product to obtain a reaction product and a regenerated solvent; and (3) contacting the reaction product with an extraction agent for extraction to obtain an oil-phase product containing the phenolic monomer and a water-phase product containing the saccharide derivative. According to the method provided by the invention, the lignin in the woody biomass can be converted into the monophenol aromatic compound with high selectivity, and multi-stage and high-value utilization of the biomass can be realized.

The invention belongs to the technical field of gas detection, and particularly relates to a device and a method for detecting decomposition products of insulating gas perfluoroalkyl nitrile. The device comprises a gas collection module, a pretreatment module, a multi-technology combination module, a detection gas chamber and an intelligent data processing and control system, wherein the gas collection module collects and concentrates a gas sample through an equipment gas chamber sampling unit and a low-temperature enrichment unit; the pretreatment module purifies gas and converts complex components through a high-efficiency filter, a dryer and a catalytic conversion unit; the multi-technology combination module is used for separating gas by using a micro gas chromatography unit and carrying out qualitative analysis by using an infrared spectrum unit; a gas sensitive sensor array of the detection gas chamber realizes multi-dimensional detection; a storage module of the intelligent data processing and control system stores various databases, an analysis module calls the databases to analyze multi-module data, and sampling, detection and intelligent analysis of decomposition products are achieved. The problems that existing detection has a leak detection condition and lacks pertinence and high efficiency are solved.

The invention discloses a process for preparing synthesis gas by non-catalytic and catalytic coupling of hydrocarbon-containing raw material gas. The process comprises the following steps: (S1) dividing preheated raw material gas into first raw material gas and second raw material gas; (S2) introducing the first raw material gas, water vapor and preheated oxygen into a non-catalytic reactor, and carrying out a non-catalytic conversion reaction to generate first synthesis gas; (S3) introducing the second raw material gas and supplemented water vapor into a pre-catalytic reactor, and carrying out pre-catalytic conversion reaction to generate second synthesis gas; (S4) introducing the first synthesis gas and the second synthesis gas into a catalytic reactor, and carrying out catalytic conversion reaction to prepare third synthesis gas; and (S5) carrying out heat recovery on the prepared third synthesis gas to obtain the synthesis gas. According to the invention, the non-catalytic conversion reaction and the catalytic conversion reaction are coupled, so that the material consumption is greatly reduced, and meanwhile, heat is provided for the catalytic conversion reaction through the non-catalytic conversion reaction, so that the heat is recovered to a great extent.

There is disclosed a highly efficient and economical catalyst for carbon monoxide (CO) oxidation at low temperatures, using a non-noble transition metal composition of copper oxide (CuO), cerium oxide (CeO2), and niobium oxide (Nb2O5). The catalyst, designated as 10CuCeNb, is synthesized via the wet impregnation method and is composed of with 10% CuO—CeO2 supported on Nb2O5. It shows a significantly improved performance with full CO conversion achieved at relatively low temperature of 150° C. It demonstrates high stability over a 12-hour reaction time. The activation energy (Ea) is 23.1 kJ mol−1, supporting low-temperature CO oxidation with minimal energy input. The catalyst's high activity and stability are attributed to the formation of oxygen vacancies and active Lewis acid sites generated from the synergistic interaction between CuO, CeO2, and Nb2O5. This catalyst offers a cost-effective alternative to noble metal catalysts for use in catalytic converters, effectively reducing CO emissions in industrial and environmental applications.

The invention provides a black TiO2 nanosheet (at) Pt nanoparticle photoelectric catalyst and a preparation method and application thereof in methane photoelectric catalytic conversion, black TiO2 is prepared by introducing surface defects (such as oxygen vacancies) so as to expand the visible light response range of the black TiO2, and the surface of the black TiO2 is modified by precious metal nanoparticles (such as Pt), so that the visible light response range of the black TiO2 is expanded. While the photo-induced electron separation is promoted and the catalytic activity is improved, the overall conductivity and the interface electron transfer rate are remarkably improved. Particularly, TiO2 is constructed into an ultrathin two-dimensional nanosheet structure, so that not only can a larger specific surface area and more reaction active sites be provided, but also the diffusion path of photon-generated carriers can be shortened, and the recombination probability can be effectively reduced, thereby further enhancing the photoelectric conversion efficiency. Compared with the prior art, the catalyst provided by the invention has the advantages of ultrathin two-dimensional structure, surface defect regulation and precious metal synergistic modification, and can realize efficient visible light driven photoelectrocatalytic methane conversion.

The application discloses a high-performance separator coating for lithium battery positive electrodes and a processing method thereof, and belongs to the technical field of lithium battery materials, aiming to solve the problems of weak inhibition of polysulfides, difficult balance between ion transmission and blocking, poor high-temperature stability and low processing efficiency of the existing separator coating. The separator coating is composed of a composite sulfur carrier, a conductive additive, a functional adhesive and a thermal stability enhancer, adopts a double-layer gradient structure with a low-porosity dense barrier in the inner layer and a high-porosity high-efficiency lithium transmission in the outer layer, and its processing method comprises composite sulfur carrier preparation, double-station alternating coating, gradient temperature vacuum drying and low-temperature plasma activation. The application realizes triple synergy of physical adsorption, chemical anchoring and catalytic conversion, so that the capacity retention rate of lithium-sulfur batteries after multiple cycles still reaches a high level, the thermal shrinkage rate of the coating is low, the product qualified rate is improved, and the application is suitable for high-energy-density lithium-sulfur batteries and high-nickel ternary lithium batteries, and meets the long-cycle and high-safety requirements.

The invention discloses a composite catalyst for recovering monophenol from waste fan blades as well as a preparation method and application of the composite catalyst. The catalyst is prepared by taking a beta molecular sieve as a carrier and CeO2-Fe2O3 bimetallic oxide as an active component through a coprecipitation-calcination method. By changing the proportion of Ce < 2 + > / Fe < 3 + >, precise regulation and control of intermetallic interaction can be realized, and the content of active oxygen species and acid sites on the surface of the catalyst is remarkably increased. Meanwhile, due to the ordered macroporous structure of the beta molecular sieve, the shape selectivity of reactants is enhanced, the monophenol yield is remarkably increased, and the problem of carbon deposition in the catalysis process is effectively inhibited. The catalyst has high specific surface area, excellent catalytic activity and cycling stability, and can realize efficient catalytic conversion of waste fan blades within 450-650 DEG C. The process is simple and convenient to operate, low in energy consumption and high in monophenol yield, has both environmental and economic benefits, and provides a new strategy for resource utilization of fan blades.

The invention discloses an enhanced Raman scattering substrate for chiral molecule detection and a preparation method, and relates to the technical field of spectral analysis and chiral recognition. Chiral cysteine is induced at the core of the gold nanorod to form a spiral chiral gold-silver alloy layer and then wraps the zirconium-based metal organic framework, the synthesized chiral gold rod (at) MOF material has excellent LPSR effect and chiral electromagnetic field, and the MOF layer on the surface can well adsorb molecules to be detected to enter a plasma hot spot area. The Raman substrate is excellent in SERS performance. According to the composite material, through the dual effects of molecular enrichment and electromagnetic enhancement, enantiomers are distinguished directly through SERS intensity, and labeling or catalytic conversion is not needed.

The invention discloses a Pickering IL emulsion microreactor constructed on the basis of temperature-sensitive double-enzyme Janus spheres and application of the Pickering IL emulsion microreactor to enhanced catalysis of conversion of CO2 into formic acid. A Janus emulsion template method is combined with a photocuring technology to synthesize a nano-scale dual-functional temperature-sensitive Janus sphere, one half of the nano-scale dual-functional temperature-sensitive Janus sphere is a hydrophilic hydrocarbon polymer, the other half of the nano-scale dual-functional temperature-sensitive Janus sphere is a hydrophobic fluorocarbon polymer, and rapid inversion of a Pickering emulsion can be realized by utilizing temperature sensitivity. The method comprises the following steps: preparing a Janus particle hydrophilic / hydrophobic hemisphere, selectively immobilizing formate dehydrogenase FDH and carbonic anhydrase CA on the Janus particle hydrophilic / hydrophobic hemisphere to obtain a temperature-sensitive FDH-Janus-CA composite sphere, introducing a fluorine-functionalized ionic liquid to regulate and control the internal microenvironment of a microreactor, and constructing a Pickering IL emulsion microreactor. The CO2 absorption capacity is increased by 47 times compared with that of a pure water system, the formic acid yield reaches 27.5 mM and is higher than the maximum value 22.8 mM of current enzyme electrocatalysis, the storage and catalysis stability is good, and an efficient and sustainable scheme is provided for CO2 recycling.

The invention discloses an adsorption catalyst as well as a preparation method and application thereof, and relates to the technical field of environmental protection. The adsorption catalyst comprises a porous carrier, and inorganic nonmetal nanoparticles and a metal oxide catalyst are loaded on the porous carrier; wherein the inorganic nonmetal nanoparticles are selected from at least one of titanium dioxide, silicon dioxide and zinc oxide; the metal oxide catalyst is selected from at least one of manganese oxide, iron oxide and copper oxide. The adsorption catalyst has the characteristics of efficient adsorption, low-temperature catalysis and high catalytic conversion rate; the preparation method is simple, low in cost and easy for industrial production; when the catalyst is used for treating volatile organic compounds, the catalytic temperature is remarkably improved, the treatment efficiency of VOCs is effectively improved, and the catalyst has a wide application prospect in the field of VOCs waste gas treatment.

A process for the synthesis of methanol (MeOH) comprising the following steps: (a) passing a water-containing stream (3) through an electrolysis unit (4) to produce a cathode-side stream (5) comprising hydrogen (H2) and an anode-side stream (6) comprising oxygen (O2); (b) heat-exchanging said cathode-side stream (5) and optionally said anode-side stream (6) in one or more indirect heat exchanger(s) (7, 8, 32, 33) to obtain a cathode-side heat-exchanged stream (9) and optionally an anode-side heat-exchanged stream (10); (c) condensing said cathode-side heat-exchanged stream (9) to separate a liquid condensate product (11) and a syngas (12); said cathode-side stream (5) and / or said syngas (12) comprise carbon dioxide and optional carbon monoxide added through a separate stream (2); (d) compressing said syngas (12) in a compressor (27, 28) and then feeding compressed syngas (13) to a MeOH synthesis loop (14) wherein catalytic conversion of said compressed syngas (13) into MeOH is carried out under methanol synthesis conditions, thus obtaining a crude methanol stream (15); (e) distilling said crude methanol stream (15) in one or more distillation column(s) (16, 17) to give a refined MeOH product (19, 22); (i) recycling as feed to the electrolysis unit (4) at least a portion of at least one of: (A) a portion (31) of said compressed syngas (13); and / or (B) a bottom water stream (20) of a distillation column (16, 17).

An oven appliance includes a housing defining a discharge vent, a cooking chamber positioned within the housing, an exhaust duct providing fluid communication between the cooking chamber and the discharge vent, an air handler operably coupled with the exhaust duct for urging a flow of heated air from the cooking chamber, through the exhaust duct, and out of the discharge vent, and a catalytic converter assembly. The catalytic converter assembly includes a catalytic element positioned within the exhaust duct for lowering volatile organic compounds from the flow of heated air and a catalyst heater positioned upstream of the catalytic element for selectively heating the flow of heated air.

Examples provide systems and methods for detecting vehicle tamper events without relying on a clear line-of-sight. Namely, examples leverage an intelligent insight that many types of vehicle tamper events have unique audio signatures. Accordingly, examples detect / classify vehicle tamper events based on these unique audio signatures. Moreover, examples can verify these audio-based classifications by analyzing acceleration-related data (e.g., relative acceleration data for a body of a vehicle, relative jerk data for a body of a vehicle, etc.) to determine suspicious movement of a body of a vehicle during a potential / suspected vehicle tamper event. This acceleration-related verification step can reduce occurrence of false positive audio-based classifications caused by other noise events proximate to the vehicle that have similar audio signatures to vehicle tamper events (e.g., drilling or other noise from a construction site, rain, etc.).

The invention discloses a lithium battery positive electrode high-performance diaphragm coating and a processing method, belongs to the technical field of lithium battery materials, and aims to solve the problems of weak polysulfide shuttling inhibition, difficulty in balancing ion transmission and barrier properties, poor high-temperature stability and low processing efficiency of an existing diaphragm coating. The diaphragm coating consists of a composite sulfur carrier, a conductive additive, a functional adhesive and a thermal stability enhancer, and adopts a double-layer gradient structure with low porosity of an inner layer for compact blocking and high porosity of an outer layer for efficient lithium transmission; the processing method comprises the steps of preparation of the composite sulfur carrier, double-station alternate coating, gradient heating vacuum drying and low-temperature plasma activation. According to the invention, triple synergy of physical adsorption, chemical anchoring and catalytic conversion is realized, so that the capacity retention ratio of the lithium-sulfur battery after multiple cycles still reaches a relatively high level, the thermal shrinkage rate of the coating is relatively low, the product percent of pass is improved, and the method is suitable for high-energy-density lithium-sulfur batteries and high-nickel ternary lithium batteries, and meets the requirements of long cycle and high safety.

The invention belongs to the technical field of catalysts, and particularly relates to a metal catalyst for oxidative depolymerization of industrial lignin as well as a preparation method and application of the metal catalyst. By controlling synthesis conditions, the alpha-Fe2O3 carrier with a small particle size and a high defect state is obtained, the specific surface area of the catalyst and the exposed number of surface active sites are effectively increased, and the reaction activity and reaction rate of the catalyst are remarkably enhanced. And secondly, Co / alpha-Fe2O3-D, Mn / alpha-Fe2O3-D and Cr / alpha-Fe2O3-D catalysts are prepared by adopting an atomic layer deposition method, so that the metal dispersibility and the interface synergistic effect are effectively improved, the catalysts are endowed with excellent structural stability and sulfur poisoning resistance, and the catalyst is suitable for desulfurization and efficient catalytic conversion of industrial lignin under harsh reaction conditions such as high temperature and high pressure. Experimental results show that after 8 hours of reaction, the depolymerization rate of lignin can reach 60%, the conversion rate of high-added-value products of aromatic aldehyde and aromatic acid exceeds 40%, and the overall performance is obviously superior to the existing similar technical level.

The invention discloses a sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material as well as a preparation method and application thereof, and belongs to the technical field of preparation methods of lithium-sulfur battery electrode materials, the method comprises the following steps: dispersing biomass derived porous carbon in an ethylene glycol solution dissolved with niobium pentachloride, and sequentially performing hydrothermal reaction to obtain the sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material. The preparation method comprises the following steps: firstly, preparing a porous carbon composite material, calcining the porous carbon composite material, performing calcination reaction on the porous carbon composite material and melamine at the same time, finally mixing the porous carbon composite material with elemental sulfur, and performing heat treatment to obtain the sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material. Lamellar niobium oxide / niobium nitride is utilized to increase polysulfide adsorption and catalytic conversion sites, a built-in electric field generated by constructing a niobium-based heterojunction is utilized to promote the electron transfer rate in the polysulfide conversion process, the electrode reaction kinetics is accelerated, and biomass derived porous carbon is utilized to improve the matrix conductivity and inhibit the shuttle effect of polysulfide, so that the conversion efficiency of the polysulfide is improved. The cycle performance and the service life of the lithium-sulfur battery are synergistically improved.