669 results about "Synergistic catalysis" patented technology

The invention relates to a process for the transition metal-catalyzed addition of SiH-containing poly-siloxanes onto olefinic compounds, wherein the catalyst used is a combination of at least two compounds of platinum metals, and also to a corresponding catalyst system.

The invention belongs to a multi-technology synergetic catalysis advanced micro-bubble ozone oxidation tower mainly aiming at the treatment of refractory industrial wastewater. Influent (1) and O3 generated by an ozone generator (24) are injected into a water distribution cabin through a dissolved gas pump (5) and enter a micro-bubble release contact area (7) through a pore plate to release dissolved gas; Liquid which contains slag flows upwards and enters a floating slag separation area (8), liquid which contains no slag flows downwards and enters a gas-liquid separator (9), one part of effluent (10) is drained from a drain hole (11), and one part of the effluent (10) is refluxed to a dissolved gas pump intake pipe (12); an ultrasonic vibrator (13) and an ultraviolet light source (14) provide an ultrasonic and ultraviolet synergetic catalysis action; floating slag overflows to a collecting groove (15) and is drained through a drain hole (16); and a coagulant, powder activated carbon and hydrogen peroxide are added by adding systems (2, 3, 4) to provide a coagulation action and the synergetic catalysis action of PAC (powdered activated carbon) and H2O2. Tail gas is refluxed to the ozone generator through a drain hole (17), a one-way valve (18), gas suction tanks (19 and 20) and a dryer (23). The oxidation tower is compact in structure and has high treatment efficiency.

The invention relates to a complex function ion liquid system, producing method and the application thereof belonging to new material and refinery chemical field. The complex function ion liquid system is composed of phosphine ligand functional ion liquid and alkali functional ion liquid, in which the phosphine ligand functional ion liquid is to link the traditional phosphine ligand to the typical ion liquid with an introducing position on the cation segment or the anion segment of the ion liquid. The cation ion and anion ion parts of the alkalescence functional ion liquid may have the alkaline group respectively or simultaneously. The provided complex function ion liquid can be applied in the coupling reaction of C-C/C-N. The advantages is that: complex function ion liquid system simultaneously plays a role of ligand, attaching acid agent and solvent and puts up an integrated cooperative catalytic effect; and it can be reused for several times and avoids using the poisonous, harmful and volatile organic solvent.

The invention belongs to the technical field of semiconductor oxide gas sensor, and specifically relates to a hollow spherical SnO2/CeO2 heterostructural composite oxide ethanol gas sensor and a preparation method thereof. A hollow spherical SnO2/CeO2 heterostructural composite oxide sensitive material prepared through a two-step hydrothermal method is used. With utilization of a heterostructure formed between SnO2 and CeO2 and synergistic catalysis action of SnO2 and CeO2 on ethanol, the gas sensitive characteristic of the sensor on ethanol is effectively improved. In addition, the adopted sensor structure is composed of a commercially available Al2O3 insulation ceramic tube with two annular gold electrodes, a semiconductor sensitive material coating the annular gold electrodes and the Al2O3 insulation ceramic tube, and a nickel-chromium alloy heating coil passing through the Al2O3 insulation ceramic tube. The ethanol gas sensor is simple in device process, small in size and suitable for mass production, thereby having broad application prospects in detection of the ethanol content.

The invention relates to a method for catalyzing and preparing annular carbonic ester by supported ionic liquid, which is characterized in that supported 1,2,4-triazole ionic liquid is taken as a catalyst, the amount of a catalyst accounts for 0.2-5 mol% of that of epoxy compounds (calculated by the content of ionic liquid), the epoxy compounds and carbon dioxide are synthesized into the relevantannular carbonic ester through cycloaddition under the condition that the reaction pressure is 0.1-10.0MPa, the reaction temperature is 50 DEG C-150 DEG C and the reaction time is for 0.5-8 hours. The synthetic method has the characteristics of high catalyst activity, low cost, long usage life, easy products separation, easy catalyst recovery and the like, and a tertiary amino group contained in 1,2,4-triazole is capable of possessing the effect of the synergetic catalysis.

The invention relates to a three-way catalyst used for automobile emission purification and a preparation method thereof, and belongs to the field of atmospheric pollution regulation and environment-friendly catalytic materials. The catalyst uses a cordierite honeycomb ceramic as a carrier, a mixture coating of Gamma-Al2O3 and rare earth complex oxide (Ce-Zr-M-Ox) as a promoter, and transition metals of Co and Ni, and precious metals of Pd and Rh as catalytic activity components. According to the invention, through the adoption of a sol method, the pre-treated carrier is coated with the promoter coating, the carrier coated with the promoter coating is dipped into a precursor complex solution of catalytic activity components by using an equal-volume dipping method, and the catalyst is obtained through drying and roasting. The three-way catalyst has low precious metal content; the transition metals of Co and Ni have well concerted catalysis with the precious metals; higher three-way catalytic activities and excellent low temperature ignition performances are shown; carbon monoxide, nitrogen oxide, and hydrocarbon in automobile exhaust can be effectively removed; the preparation process of the catalyst is simple.

The invention relates to a method for preparing a catalyst capable of degrading gaseous phase volatile organic pollutant. The method for preparing a platinum/semiconductor oxide catalyst having a photo-thermal synergistic effect comprises the steps of: 1) adding the semiconductor oxide into a solvent, 2) performing the ultrasonic processing for 1 to 2 hours, 3) adding chloroplatinic acid aqueous solution into the suspension of the semiconductor oxide, stirring at dark place and then stirring under light, 4) coating on the surface of an UV lamp, 5) drying and 6) utilizing the luminous energy and thermal energy emitted by the UV lamp to steam for 2 to 5 h under the mixture steam of water and alcohol, in order to catalytically reduce the chloroplatinic acid into nanometer platinum grain through the luminous energy, opening a gaseous phase catalytic reactor, going on illuminating for 1 to 3 h and volatilizing the residual alcohol and water. The method for preparing the product has simple technique, is easily industrialized, and is capable of efficiently photo-thermal concerted catalyzing to degrade the gaseous phase volatile organic pollutant, with high catalytic stability.

The invention discloses a saccharifying method of xylon cellulose through ultrasonic coordinated modified cellulose enzyme, which comprises the following steps: grinding and predisposoing xylon in the raw material through alkaline; reacting activated methoxy carbowax and cellulose enzyme in the citrate-sodium citrate buffer solution to obtain modified cellulose enzyme; blending modified cellulose enzyme, beta-glucosidase, amylase and pectase to obtain composite liquid; adding composite enzyme into predisposed raw material according to corresponding proportion; proceeding enzyme catalytic reaction through ultrasound; filtering; decompressing; evaporating; obtaining condensed sugar liquid.

The invention discloses a preparation method of an environmental estrogen label-free immunosensor and a use of the environmental estrogen label-free immunosensor in environmental estrogen detection, and belongs to the technical field of novel functional nano-materials and environment detection. The preparation method utilizes the two novel functional nano-materials to modify working electrodes, utilizes synergetic catalysis effects and antibody sorption effects of the two novel functional nano-materials, and prepares the environmental estrogen label-free immunosensor which has high sensitivity, good specificity and fast detection rate, is prepared by simple processes and is used for environmental estrogen detection.

The invention belongs to the technical field of macromolecular synthesis and particularly relates to a preparation method of a biodegradable block copolymer. The biodegradable block copolymer is prepared by taking a hydroxyl terminal compound as an initiator and performing synergistic catalysis on an epoxy monomer, an anhydride monomer and a lactone monomer by using nonmetallic lewis acid and lewis base catalysts through one-step polymerization. The preparation method of the biodegradable block copolymer has the following beneficial effects: due to use of the nonmetallic lewis acid and lewis base catalysts, the problem of medal residues of the block copolymer can be solved; furthermore, triblock copolymers and pentablock copolymers containing polyether blocks and with rich structure typescan be prepared. The purification problem that the fractional step method needs to charge for many times and wastes time and energy can be solved by a one-step method, the production efficiency can beimproved and the production cost can be reduced. The biodegradable block copolymer prepared by the method is controllable in relative molecular weight and block length.

The invention relates to a composite catalyst of an air electrode of a lithium-air cell. The composite catalyst comprises a metal catalyst, and a support for performing synergic catalysis with the metal catalyst. The metal catalyst is uniformly distributed on the surface of the support via in-situ loading. The metal catalyst accounts for 0.01 wt%-99.9 wt% of the composite catalyst, preferably 0.1 wt%-60 wt%, and more preferably 0.5 wt%-5 wt%. By utilizing the metal catalyst and the support with synergic effect on the metal catalyst, the composite catalyst of the air electrode is formed, the dispersibility and the stability of the original metal catalyst are improved, and also the catalytic activity not owned or unreached by the single metal catalyst is induced to generate.

The invention relates to a preparation method of a Fe-MnO2 catalyst for purifying VOCs through efficient photo-thermal synergistic catalysis. The preparation method has the beneficial effects that a target catalyst is only synthesized from soluble Fe(II) salt, Mn(II)salt and KMnO4 which are low in cost and easily available through hydrothermal reaction, reaction conditions are mild, the process is simple, no additive is added, the high-temperature calcination is not required, and heavy metals do not need to be loaded, so that the production cost is greatly lowered. A Fe-doped MnO2 composite catalyst prepared by virtue of the preparation method has very strong absorbency in an ultraviolet spectrum, a visible spectrum and an infrared spectrum and has efficient catalytic activity and stability for photoinduced thermocatalytic degradation of VOCs in the ultraviolet spectrum, the visible spectrum, the infrared spectrum and a full spectrum, and the photoinduced thermocatalytic activity of the catalyst is far higher than that of commercial TiO2 (P25) as a standard photocatalyst, and the deficiency that TiO2 (P25) only has ultraviolet light catalytic activity is overcome.

The invention provides a synthesis method of a carbon-containing compound. The synthesis method comprises the following steps: using a copper alloy material with an amorphous structure as a catalyst,and carrying out electrochemical reaction on CO2 to obtain the carbon-containing compound. The copper alloy material with the amorphous structure is used as the catalyst, and CO2 is directly electrocatalytically reduced to prepare alcohol, acid, ketone and other carbon-containing compounds. The copper alloy material can be prepared into various macroscopic forms such as a block shape, a powder shape and a film shape and can be directly used as an electrocatalytic electrode material to be applied to a CO2 electrocatalytic reduction battery, and the electrocatalytic activity and the stability ofthe catalyst are improved and then the performance and the efficiency of an electrolytic tank are improved. According to the synthesis method, the composition and the structure of the copper alloy material with the amorphous structure can be regulated and controlled so that the synergistic catalytic performance among the catalysts can be effectively exerted, the variety of products can be regulated and controlled and different carbon-containing compounds such as alcohol, acid and ketone can be selectively obtained.

The invention discloses a diesel vehicle tail gas purifying catalyst and a preparation method thereof. The catalyst is shown as follows: V2O5-CeO2/TiO2-SiO2-WO3, wherein TiO2-SiO2-WO3 is a titanium-silicon-tungsten composite oxide carrier; V2O5 is 3% (in percentage by weight) of the carrier in weight and CeO2 is 2%-8% of the carrier in weight. The preparation method of the diesel vehicle tail gas purifying catalyst comprises the following steps of: dipping and loading the active ingredients on the carrier by using the titanium-silicon-tungsten composite oxide as the catalyst carrier material, drying and roasting to form catalyst powder; and preparing the catalyst powder into slurry for coating on a ceramic base body to form an integral catalyst. According to the diesel vehicle tail gas purifying catalyst and the preparation method thereof disclosed by the invention, precursor cerium nitrate of the second active ingredient cerium dioxide is added for bringing the concerted catalysis effects of the active ingredients into play by optimizing primary and secondary active ingredients of the catalyst. The catalyst disclosed by the invention can be used for effectively improving the performances of the catalyst, lowering the initiation temperature of NOx to 180 DEG C, expanding a full conversion window and strengthening anti-ageing performances of the catalyst. Meanwhile, the catalyst has a good removing rate to NOx under a high-sulfur high-humidity environment.

The process of preparing hexafluoropropylene oligomer with hexafluoropropylene as material, alkali metal fluoride as main catalyst, organic base as co-catalyst and polyether as catalytic promoter includes two sections of pressurized oligomerization reaction in non-protonic polar solvent at 10-150 deg.c, with the weight ratio of main catalyst, co-catalyst, catalytic promoter and non-protonic polar solvent being 1 to 0.1-10 to 1-10 to 8-40. The first section of pressurized oligomerization reaction is performed in a pressure container with hexafluoropropylene gas pressure of 0.1-1.5 MPa, and the second section of pressurized oligomerization reaction is performed in inert gas of pressure 0.1-1.5 MPa. The present invention has the beneficial effects of high hexafluoropropylene converting rate, synergistic catalysis, high perfluoro nonylene selectivity, convenient solvent recovery, etc.

The invention provides a catalyst for synthesizing cyclic carbonate, a preparation method of the catalyst and a preparation method of the cyclic carbonate. The catalyst is a combination of any one ortwo or more of compounds shown in the formula I or II or III. The catalyst for synthesizing the cyclic carbonate is a multi-active-site catalyst, an active group R group and halogen atoms in the catalyst can generate a cooperative catalysis function, so that under the condition that other additives and catalysts do not need to be added, under the mild condition, a cycloaddition reaction can be efficiently and high-selectively catalyzed for synthesizing the cyclic carbonate, and the catalyst has high industrial potential.

The invention relates to a preparation method of an alkali-earth metal doped MnO2 catalyst capable of efficiently performing catalyzing purification on VOCs through photothermal synergy. The method is characterized by taking low-cost and easily available soluble alkaline-earth metal R (Mg, Ca and Sr) (II) salt, Mn (II) salt and KMnO4 as raw materials and synthesizing the target catalyst through hydrothermal reaction. The method has the advantages of mild reaction condition, simple process, no additives, no high-temperature calcination and no load of noble metals, so that the production cost is greatly reduced. The prepared alkali-earth metal doped MnO2 compound catalyst has high adsorption in ultraviolet, visible and infrared spectra, catalysis activity and stability for efficiently degrading the VOCs through photoinduced thermal catalysis of ultraviolet, visible, infrared and full spectra; the photothermal catalysis activity of the catalyst is far higher than that of commercial TiO2(P25) which is used as a reference photocatalyst; the shortcoming that TiO2(P25) only has ultraviolet catalysis activity is overcome.

The invention relates to the technical field of chiral catalytic materials, and relates to a preparation method of chiral POMOFs. The POMOFs with a tunnel structure are prepared through a hydrothermal technology with L-BCIP or D-BCIP as a chiral source, L as a functional connecting ligand, polyoxometallate (POM) as an oxidation catalysis function group, and Ni<2+>, Cu<2+>, Co<2+> or Zn<2+> in a transition metal salt TM as a node. The above catalyst has the advantages of simple synthesis, easy operation, low price of catalysis reaction raw materials, high yield, controllable preparation of two enantiomers, and easy large-area popularization application. Multiple catalysis site synergistic catalysis makes the catalysis reaction have very good conversion rate and stereoselectivity under a catalysis dosage, so the catalyst is suitable for industrial large-scale production demands, and has very good industrial prospect.

The invention relates to a method for preparing cyclic carbonate by catalyzing with ionic liquid. The method is characterized in that: addition of an epoxy compound and carbon dioxide is catalyzed by taking 1,2,4-triazole ionic liquid as a catalyst under the condition that the using amount of the catalyst is 0.4-2 molar percent (counted by the content of ionic liquid) based on the using amount ofthe epoxy compound, the reaction pressure is 0.1-10.0MPa, the reaction temperature is 50-150 DEG C and the reaction time is 0.5-8 hours to synthesize corresponding cyclic carbonate. The synthetic method has the characteristics of high catalyst activity, low cost, long service life and the like, and a tertiary amino group contained in 1,2,4-triazole has a concerted catalysis effect possibly.