1402 results about "Carbon deposit" patented technology

The invention relates to the technical field of flue gas treatment, in particular to a sintering flue gas denitration and dust removal integrated post-CO removal method which is specifically completed through cooperation of a sintering flue gas treatment system, and the sintering flue gas treatment system comprises a GGH heat exchanger, a desulfurization reactor, a denitration dust remover and a CO reactor which are sequentially communicated through pipelines. The CO catalyst module is a transition metal oxide CO catalyst; the cleaning device is used for cleaning ash of the CO catalyst module; the ammonia gas is sprayed into the outlet of the desulfurization reactor, so that ammonia escape is reduced, poisoning of the CO catalyst module is reduced, the catalytic efficiency of the CO catalyst module is improved, and the service life of the CO catalyst module is prolonged; the CO catalyst module is regularly subjected to air blowing and back blowing in a closed area, so that impurities such as carbon deposition on the CO catalyst module are cleaned, more active sites are exposed, the service life of the CO catalyst module is prolonged, and the investment and operation cost is reduced by adopting a transition metal oxide CO catalyst.

The invention relates to a preparation method of a catalyst for synthesizing 2, 6-dimethylphenol, which comprises the following steps: mixing ferric salt, aluminum salt, magnesium salt, an acidic material and water to obtain a solution A; mixing sodium silicate, a template agent and water to obtain a solution B; mixing the solution A and the solution B, aging, crystallizing, filtering, drying and calcining to obtain a catalyst precursor I; mixing with an alkaline solution, and filtering to obtain a catalyst precursor II; then mixing with an acidic solution, filtering to obtain a solid, and then washing and calcining to obtain a catalyst; the preparation method of the 2, 6-dimethylphenol comprises the following step of preparing the 2, 6-dimethylphenol by taking methanol, phenol, water and benzoic acid as raw materials in the presence of the catalyst. The catalyst provided by the invention has good catalytic activity, reduces the problem of carbon deposition, and has good selectivity and high phenol conversion rate when being used for preparing 2, 6-dimethylphenol.

The invention discloses a titanium dioxide nanotube confinement catalyst for methane dry reforming and a preparation method and application thereof, a transition metal element is used as an active phase, the titanium dioxide nanotube confinement transition metal element catalyst is modified by a rare earth metal element, and the weight of the methane dry reforming catalyst is used as a reference. The content of the transition element is 1-10%, preferably 1-5%, and the content of the rare earth element is 1-5%, so that the problems of activity reduction and poor stability caused by easy generation of carbon deposition of the methane dry reforming catalyst in the prior art are solved.

The invention relates to a dual-fuel premixing type ejector. The valve comprises a valve body. The outer needle is movably connected into an inner cavity of the valve body, a pressure chamber is formed between the head of the outer needle and the end of the inner cavity of the valve body, a first fuel spraying hole used for spraying first fuel is formed in the head of the outer needle, and a second fuel spraying hole used for spraying second fuel is formed in the end of the valve body. The first fuel spray hole and the second fuel spray hole extend into the pressure chamber, and the outer needle head can make contact with or be separated from the end of an inner cavity of the valve body so as to open or close the second fuel spray hole. And the inner needle is movably connected to the interior of the inner cavity of the outer needle, and the head of the inner needle can make contact with or be separated from the end of the inner cavity of the outer needle so as to open or close the first fuel spray hole. The temperature of the head of the fuel nozzle can be effectively reduced, formation of carbon deposition of the nozzle hole is inhibited, and the design and process difficulty is reduced.

A light hydrocarbon aromatization catalyst capable of increasing the yield of light alkane comprises a hydrogen type Silicalite-1 (at) ZSM-5 core-shell molecular sieve, an active metal and / or a binder, the hydrogen type Silicalite-1 (at) ZSM-5 core-shell molecular sieve takes a Silicalite-1 molecular sieve as a core layer and a ZSM-5 molecular sieve as a shell layer, and the particle size of the hydrogen type Silicalite-1 (at) ZSM-5 core-shell molecular sieve is 90-140 nm. The catalyst is applied to light hydrocarbon aromatization reaction, has higher low-carbon alkane yield and lower dry gas yield, and is good in stability, long in one-way reaction period and low in carbon deposit amount.

The invention discloses a porous tubular methanol solid oxide fuel cell with a closed end, the fuel cell is a tubular solid oxide fuel cell (SOFC) stack, and the tubular SOFC stack comprises a plurality of tubular SOFC single cells; in the moving direction of fuel in the inner tube, the bottom end of the inner tube of the tubular SOFC single cell is open, the top end of the inner tube of the tubular SOFC single cell is closed, and a plurality of sections of closed areas and a plurality of sections of perforated areas are arranged on the tube wall of the inner tube and are sequentially and alternately arranged. According to the inner tube structure of the tubular SOFC single cell, the distribution uniformity of methanol on the surface of the anode of the solid oxide fuel cell can be effectively improved, so that the problem of serious carbon deposition caused by non-uniform distribution of methanol on the surface of the anode of the solid oxide fuel cell is effectively solved.

The invention provides a method for preparing a carbon nanotube with assistance of carbon dioxide, which is characterized in that methane is used as a carbon source, carbon dioxide is used as auxiliary gas, and the carbon nanotube is prepared under the action of a catalyst. Carbon deposition generated by using methane as carbon source gas is reduced by using carbon dioxide, and the quality and performance of single-wall, double-wall or three-wall carbon nanotubes are improved, so that application requirements are met.

The invention discloses a self-rotating cleaning nozzle for cleaning carbon deposits in an air cylinder and a piston ring of a fuel engine, and belongs to the field of engine carbon deposit cleaning. One end of the pulse rotary spraying assembly is connected with an electromagnetic valve seat, and the other end of the pulse rotary cleaning assembly can be directly installed on a spark plug hole to be connected with a combustion chamber, so that a hollow gas conveying cavity is formed. When the piston is located at the top dead center of the air inlet stroke, compressed air is injected into the air cylinder to push the piston to do work, and therefore the engine works continuously. The engine cleaning device has the beneficial effects that an engine is cleaned in the moving process, residues are discharged from the air inlet cavity channel, and the residues cannot cause secondary pollution to the space of a combustion chamber and three-way catalysis; compressed air of the sector pushes the spraying nozzle to rotate and spray out along the center shaft, 360-degree surrounding type cleaning can be conducted on the space of the combustion chamber, and no cleaning blind area is left.

The invention relates to the technical field of load switches, in particular to a load switch and a ring main unit thereof, the load switch comprises a cabinet body, a cabinet door, a support frame, a sleeve, a static contact and a moving contact, the cabinet door is hinged to the cabinet body, the support frame is fixedly connected with the inner wall of a shell, both the sleeve and the static contact are fixedly connected with the support frame, and a control rod is further hinged to the support frame; the movable contact is slidably connected to the sleeve, one end of the movable contact is hinged to the control rod, a spray head is fixedly installed in the sleeve, and a plurality of first cleaning pipelines and second cleaning pipelines are arranged in the spray head. The cleaning assembly cleans carbon deposits on the surfaces of the moving contact and the static contact, and the problems that the contacts are powered off due to carbon deposits on the contacts, an electric appliance cannot work normally, and the service life of the electric appliance is shortened are solved.

The invention discloses an engine oil carbon deposition sampling detection method and system based on multispectral imaging, and the method comprises the steps: carrying out the collection of a to-be-processed multispectral image of an engine oil sample under a multispectral light source, and carrying out the preprocessing of the image to obtain a to-be-processed image; performing dark current correction on the to-be-processed image according to a band ratio method, and enhancing the signal intensity of the to-be-processed image; calculating the spectral reflectivity of the to-be-processed image according to the signal intensity of the to-be-processed image; extracting a three-dimensional feature tensor in the to-be-processed image according to the spectral reflectivity; segmenting the to-be-processed image according to the three-dimensional feature tensor, and screening a carbon deposition region; calculating a carbon deposition probability value of each pixel point in the carbon deposition area according to the spectral reflectivity; and setting a carbon deposition threshold value according to the carbon deposition probability value for judgment so as to judge whether carbon deposition exists in the engine oil sample or not. The similarity between the sample engine oil spectral reflectivity and the reference engine oil is reflected, and a possible carbon deposition area is found, so that the carbon deposition defect is accurately judged and identified.

The invention provides a high-selectivity anti-carbon-deposition CO oxidation catalyst and a preparation method thereof. The CO oxidation catalyst comprises a carrier, an active component loaded on the surface and / or in the carrier, and an auxiliary agent, wherein the active component comprises a noble metal element, and the auxiliary agent comprises a non-noble metal element; by taking the total mass of the carrier as 100%, the content of the auxiliary agent is less than 10%, preferably 3-6%; the total mass of the carrier and the auxiliary agent is 100%, and the content of the active component is less than 1.5%, preferably 0.5-1.5%. The CO oxidation catalyst disclosed by the invention has the characteristics of NOx resistance, carbon deposition resistance, difficulty in oxidizing NO, high CO catalytic combustion activity and the like, and has excellent CO catalytic combustion performance, especially the performance of catalytic combustion of steel sintering flue gas CO.

The invention relates to the technical field of catalysts, in particular to a dehydrogenation catalyst precursor, a dehydrogenation catalyst and a preparation method and application of the dehydrogenation catalyst precursor. According to the dehydrogenation catalyst precursor, a sulfur-modified magnesium-aluminum mixed oxide is used as a carrier, and a Pt metal cluster is used as an active center; wherein the carrier is a mixed-state metal oxide with a layered hydrotalcite structure, a spinel structure and a near-crystalline synergistic structure. A magnesium-aluminum mixed oxide can be prepared by introducing a precursor of alkali metal magnesium into an aluminum oxide precursor, a layered structure or a spinel structure similar to hydrotalcite can be formed by regulating and controlling the calcination temperature, and by combining carrier surface regulation and control modification, the capability of regulating and controlling the interaction between metal and a carrier can be improved, and the performance of the catalyst is improved. Therefore, the active center of the cluster is maintained, and the acid-base property of the surface of the carrier is effectively modulated, so that carbon deposit is reduced, and the activity and stability of the catalyst are improved.

The invention discloses a CVD diamond thick film and a preparation method and application thereof. The thickness of the CVD diamond thick film is not less than 0.5 mm. The method comprises the following steps: (1) adopting a first growth process on a substrate to obtain an unmodified CVD diamond film; (2) carrying out modification treatment on the unmodified CVD diamond film obtained in the step (1) by adopting a second treatment process to obtain a modified CVD diamond film; (3) carrying out transition treatment on the modified CVD diamond film obtained in the step (2) by adopting a third transition process; and (4) the step (1) to the step (3) are cyclically operated, the cycle number is n, and the CVD diamond thick film is obtained. According to the method, through process control, the secondary nucleation process in the deposition process is achieved, the grain size is consistent in the long-time deposition process, no obvious columnar crystal exists on the diamond section, the good mechanical property is achieved, the thickness of the prepared CVD thick film reaches the millimeter level, and the hot wire carbon deposition phenomenon is remarkably relieved.

According to the method for preparing the synthesis gas through the rare earth modified all-solid-state electrolytic tank, rare earth oxide particles are anchored on a porous SFM framework by dipping the rare earth oxide nano catalyst, so that the catalytic activity of the material is greatly improved, active sites participating in the reaction are increased, the electrochemical reduction reaction is facilitated, and the yield of the synthesis gas is increased. And continuous and controllable preparation of components of the synthesis gas is realized. According to the invention, the preparation process of a traditional dipping mode is simplified, the problem of cathode stability of the solid oxide electrolytic tank during high-temperature operation is solved, meanwhile, rare earth resources are reasonably utilized, the production cost is reduced, and the defects of carbon deposition during traditional cathode operation, need of adding a protective atmosphere to prevent oxidation and the like are avoided.

The invention provides a pulse frequency adaptive matching method and system for engine combustion chamber carbon deposition cleaning, and the method comprises the steps: obtaining the carbon deposition degree distribution data, cylinder pressure data and engine vibration signals of a target engine combustion chamber uploaded by an edge calculation node; performing dynamic weight fusion on the carbon deposition degree distribution data and the cylinder pressure data to generate an engine state comprehensive score; the initial pulse frequency, matched with the engine state comprehensive score, of the cleaning equipment is searched for in a preset pulse frequency mapping table; generating a pulse frequency correction strategy according to the engine vibration signal in combination with a pre-trained reinforcement learning model; and dynamically adjusting the initial pulse frequency according to the correction strategy to generate a target pulse frequency, and sending the target pulse frequency to the edge computing node to control the cleaning equipment to execute pulse cleaning according to the target pulse frequency. According to the invention, the carbon deposition removal effect is improved, and the equipment vibration risk is reduced.

The invention relates to the field of gas adsorption and catalysis, in particular to a bifunctional catalyst and a preparation method and application thereof. The catalyst is of a hollow tubular structure, takes calcium oxide as a basic component, and further comprises a nickel oxide, a cobalt oxide and a nickel-cobalt bimetallic oxide, wherein the molar ratio of the Ca element in the calcium oxide to the nickel oxide to the Ni element in the nickel-cobalt bimetallic oxide to the cobalt oxide to the Co element in the nickel-cobalt bimetallic oxide is (5-25): (2-15): 1; the Ni element comprises two valence states of Ni < 2 + > and Ni < 3 + >; and the Co element comprises three valence states of Co < 2 + >, Co < 3 + > and Co < 4 + >. Due to the specific elements and content of the hollow tubular catalyst, the gasification catalysis capability and adsorption capability of biomass and waste plastics are improved, and carbon deposition of the catalyst is inhibited.

A combined piston ring used for a new energy hybrid power automobile engine belongs to the technical field of engines and comprises a ring body inner plate in contact with the inner side face of a main body mechanism, an ash discharge groove formed in the ring body inner plate, a scraping plate installed in a groove formed in the ring body inner plate and a plurality of shaking reeds evenly distributed between the two ring bodies. The scraping plate is in contact with the inner wall of a groove formed in the piston; in the working process of an engine, residual carbon deposits on the inner wall of a groove formed in a piston are scraped off in the rotating process of a scraping plate, the carbon deposits enter an ash discharging groove along an inclined face arranged on the scraping plate, a connecting plate makes contact with a shaking reed in the rotating process so that the shaking reed can be intermittently compressed and bounced off, the carbon deposits in the shaking reed can be prevented from being accumulated into blocks, and the service life of the connecting plate is prolonged. The carbon deposition can be effectively prevented from being accumulated in a gap between the piston ring and the piston, the piston ring is blocked, and the work of the piston is influenced.

The invention discloses a decommissioned wind power blade product-mixed fiber sorting system, which comprises a pretreatment system, a primary sorting system and a secondary sorting system, and is characterized in that a vibrating screen of the pretreatment system is used for removing residual dust and carbon deposition impurities on a decommissioned wind power blade product so as to realize primary cleaning; a calcium chloride solution with the saturated solution density of 1.81 t / m < 3 > to 1.83 t / m < 3 > at the temperature of 60 DEG C to 70 DEG C is contained in a salt water tank of the primary sorting system, so that the density of the calcium chloride solution is kept between the carbon fiber density and the glass fiber density, and therefore, after the pretreated retired wind power blade product is put into the salt water tank, the calcium chloride solution is separated from the glass fiber; the carbon fibers and the glass fibers can float or sink in a flotation manner, so that a primary separation function is realized; according to the characteristic that the carbon fibers and the glass fibers are different in color, the secondary sorting system separates a small amount of residual carbon fibers in the glass fibers or separates a small amount of residual glass fibers in the carbon fibers by arranging a color sorter, so that the advantage of improving the purity of the fibers is achieved.

The invention provides a preparation method of a catalyst, the catalyst and a diethyltoluenediamine synthesis method based on the catalyst, and belongs to the technical field of chemical synthesis. After the surface of phosphoric acid modified zeolite is coated with aluminum oxide, a layer of quantum dot intercalation metal layered oxide is coated, the surface is modified by polydopamine, citric acid is coupled, cerium oxide and ruthenium oxide are loaded, and the catalyst is prepared. The prepared catalyst can well improve the conversion rate of toluenediamine, inhibit side reactions, improve the anti-coking capability, reduce the generation of carbon deposits, prevent the agglomeration of catalyst particles, prolong the service life, improve the mechanical strength and thermal stability, reduce the activation energy in the synthesis process of diethyltoluenediamine, make the reaction conditions milder, make the yield higher, and reduce the production cost. And the method can be repeatedly used and has a wide application prospect.

The invention provides an environment-friendly low-sulfur diesel oil anti-wear agent, a preparation method and application thereof and a low-sulfur diesel oil anti-wear agent composition, and belongs to the technical field of anti-wear agents. The environment-friendly low-sulfur diesel oil anti-wear agent has a structure shown in the specification. The environment-friendly low-sulfur diesel oil anti-wear agent prepared by the invention has the advantages of excellent anti-wear performance, low acidity, small influence on the use performance of diesel oil, such as corrosivity, combustion performance, total acid value, oxidation stability and the like, capability of improving the oxidation resistance of the diesel oil, compatibility with engine oil, no increase of carbon deposit in an engine, and wide application prospect. # imgabs0 #

The utility model relates to an MPCVD deposition chamber for improving gas distribution, which comprises a deposition chamber body, the deposition chamber body is provided with a top cover part, a bowl-shaped baffle plate with an upward opening is arranged in the deposition chamber body and is positioned at the lower end of the top cover part, the bowl-shaped baffle plate and the top cover part form a first gas mixing cavity, and a plurality of gas outlet holes are uniformly distributed in the bowl-shaped baffle plate; a cone-frustum-shaped shell is arranged in the first gas mixing cavity, the shell is of a hollow structure, a second gas mixing cavity is formed in the shell, the gas inlet pipe is communicated with the second gas mixing cavity, the side wall and the bottom of the shell are each provided with a flow dividing part, and flow dividing holes communicated with the second gas mixing cavity are formed in the flow dividing parts. The gas entering the deposition chamber is uniformly mixed, so that the problems of non-uniform plasma electric field distribution and excessive carbon deposition in the middle area of the molybdenum table caused by non-uniform mixing of the gas entering the deposition chamber can be effectively avoided.

The invention relates to the technical field of marine fuel oil additives, and particularly provides a marine fuel oil purification synergist and a preparation method thereof. The marine fuel oil purification synergist comprises the following components in percentage by mass: 8%-12% of a sulfur capturing agent, 15%-20% of a core-shell dispersing agent, 5%-8% of a lubricating agent, 0.5%-1% of an antioxidant, 1%-2% of a pour point depressant and the balance of a solvent. The marine fuel oil purification synergist has the advantages of high flash point, sulfur inhibition, combustion enhancement and dispersion stability. The multi-component synergistic system not only greatly improves the combustion efficiency of the marine fuel oil, but also effectively inhibits the emission of harmful substances, obviously reduces the carbon deposition and wear of an engine, and keeps the cleanliness of a fuel oil system. In practical application, the synergist shows excellent environment-friendly benefits and economic benefits, and a green fuel solution which can meet increasingly strict requirements of environment-friendly laws and regulations and can reduce the operation cost is provided for the ship industry.

The invention relates to high-pore-volume nitrogen-doped activated carbon for capturing carbon dioxide and a preparation method of the high-pore-volume nitrogen-doped activated carbon, and belongs to the technical field of activated carbon. In order to solve the problem that high nitrogen content and high pore volume of nitrogen-doped activated carbon are not matched, the invention provides a preparation method of high-pore-volume nitrogen-doped activated carbon for carbon dioxide capture. In the preparation process of the activated carbon, an activating medium composed of a carbon source and an activating agent and a nitrogen-containing precursor are respectively laid in different mutually isolated areas in a crucible, so that the carbon deposition effect of the nitrogen-containing precursor is weakened, the high pore volume of the activated carbon is maintained, the nitrogen content of the activated carbon is improved, and the high CO2 adsorption capacity and the high CO2 / N2 adsorption selectivity are obtained at the same time. When the high-pore-volume nitrogen-doped activated carbon prepared by the method is applied to the field of industrial CO2 trapping, high CO2 adsorption capacity can be obtained, and high CO2 purity in desorbed gas can be guaranteed.

The invention discloses an automobile carbon deposition driving fault diagnosis method based on deep learning, and relates to the technical field of intelligent diagnosis. Deploying a multi-target dynamic reward function to synchronously calculate a power loss rate reward value, a carbon deposition coverage rate penalty value, a combustion efficiency gradient value and a carbon deposition growth rate gradient value, and outputting a power attenuation diagnosis state through a value iteration optimization strategy network; and receiving the power attenuation diagnosis state and the carbon deposition type classification code through the student model, loading the pre-trained teacher model, adding a confrontation discriminator in the distillation loss function, comparing the characteristic graph distribution difference of the teacher model and the student model, and outputting a grading treatment instruction matched with the vehicle state. According to the invention, by constructing the reinforcement learning agent and deploying the multi-target dynamic reward function, the comprehensive dynamic quantitative evaluation of the carbon deposition driving fault is realized.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing 5-methylfurfural by using 2-methylfuran. The special solid acid catalyst is used for replacing traditional phosphorus oxychloride, hydrogen chloride and phosphorus-containing wastewater are eliminated from the source, and the sulfolane is used for replacing DMF (Dimethyl Formamide), so that solvent residues in the product are reduced. The solid catalyst SO4 < 2-> is modified to form a strong Bronsted acid site (-SO3H) which cooperates with Ce < 3 + > / Ce < 4 + > redox to inhibit carbon deposition, selectively activate 2-methylfuran alpha-C and inhibit side reactions, so that the selectivity and yield of a target product are improved. Na2CO3 neutralization is replaced by electrochemical neutralization, salt slag solid waste is eliminated, and environmental pollution is reduced. After the organic phase is dried and dewatered through a molecular sieve, most of the solvent is removed through rotary evaporation, and the residual crude product is subjected to centrifugal molecular distillation, so that unreacted raw materials and trace impurities are effectively removed, and the product purity is remarkably improved.

The invention discloses a regeneration method of a metal modified mordenite catalyst used in a methanol amination reaction, and belongs to the technical field of catalyst regeneration. The catalyst regeneration method comprises the following steps: firstly, removing non-framework aluminum in a catalyst by using an organic acid solution, and then washing by using an organic solvent to remove residual organic acid and part of carbon deposit after acid treatment; oxidizing carbon deposit on the surface of the catalyst by adopting a hydrogen peroxide solution and inert mixed gas containing ozone; and finally, reducing active metal components in the catalyst by adopting hydrogen. According to the regeneration method, carbon deposit on the surface of the catalyst can be well and effectively removed under the low-temperature condition, generation of non-framework aluminum on the surface of mordenite in the regeneration process is reduced, the service life of the catalyst is effectively prolonged, and the regenerated catalyst can keep good reaction performance in the methanol amination reaction.

The invention belongs to the technical field of industrial combustion safety control, and provides a double-channel industrial furnace gas combustion safety interlocking control system which comprises a gas / air flow ratio dynamic monitoring module, a flue CO concentration online detection module, a double-channel data conflict arbitration processor and a visual human-computer interface. Aiming at the prominent problems of incomplete combustion of coal gas, carbon deposition, detonation risk and the like which are easy to occur under the working condition of accelerated temperature rise, the system integrates visual double-insurance safety control of dynamic calculation of a flow ratio and real-time analysis of tail gas components, and all-directional safety protection in the combustion process is realized through a multi-parameter cooperative monitoring and intelligent interlocking mechanism; the detonation risk is obviously reduced; meanwhile, the air-fuel ratio fluctuation is accurately controlled within the range of + / -5%, and the carbon deposition phenomenon is effectively reduced; and remarkable economic benefits are created while reliable operation of equipment is guaranteed.

The present invention provides a hydrogenation catalyst, and a preparation method therefor and a use thereof. The catalyst of the present invention comprises an active component and a carrier, wherein the active component is composed of Ni, Mo, and P, and the carrier is a composite oxide comprising magnesium oxide, aluminum oxide, and silicon oxide; and on the basis of the weight of the catalyst, the mass ratio of Ni to Mo in the active component is 1.1-5, preferably 1.9-2.3, and Ni is calculated as NiO and Mo is calculated as MoO3. The active component of the catalyst of the present invention contains a high content of nickel. When used for the second-stage hydrogenation of cracked gasoline, the catalyst can be suitable for treating a raw material having a higher diene content, shows relatively strong monoolefin saturation performance and desulfurization and denitrification activity, can effectively inhibit carbon deposition, and has high stability. Therefore, the catalyst of the present invention is particularly suitable for use in industrial production of the second-stage hydrogenation of cracked gasoline or a fraction thereof.

The invention provides a hierarchical pore zeolite molecular sieve as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) pretreating a hydrogen-type zeolite molecular sieve at 500-600 DEG C to obtain a pretreated hydrogen-type zeolite molecular sieve; 2) in an inert gas environment, cooling the pretreated hydrogen type zeolite molecular sieve to 300-500 DEG C, introducing an inert gas containing a carbon source into the system, and carrying out carbon pre-deposition treatment to obtain a carbon pre-deposited zeolite molecular sieve; and (3) sequentially carrying out alkali treatment, roasting treatment, acid pickling treatment and drying treatment on the pre-carbon-deposited zeolite molecular sieve to obtain the hierarchical pore zeolite molecular sieve. Through carbon pre-deposition treatment, carbon deposition layers are formed on the surface and in the zeolite, disordered etching of alkali is resisted, and the hierarchical pore zeolite molecular sieve with rich mesopores and micropore structures is obtained. The prepared hierarchical pore zeolite has good molecular diffusivity as a methanol-to-olefin catalyst, and the conversion rate of methanol and the service life of the catalyst are both improved.

The invention relates to a composite fuel oil additive, fuel oil and application. The composite fuel oil additive comprises the following components in parts by mass: 1-8 parts of an isocaprylic acid metal substance, 1-5 parts of a transition metal ionic compound and 15-20 parts of a surfactant, the surfactant is selected from one or more of nonylphenol polyoxyethylene ether, dinonyl naphthalene sulfonic acid and dodecylbenzene sulfonic acid. The composite fuel oil additive can obviously improve the combustion efficiency and the utilization rate of fuel oil / fuel oil and improve the stability of fuel oil components, so that the fuel oil / fuel oil can be fully combusted, generation of carbon emission particles is reduced, meanwhile, residual carbon deposits in a fuel oil / fuel oil engine can be cleared and decomposed, abrasive particle abrasion of the engine is reduced, and the service life of the engine is prolonged. The engine working efficiency is improved; meanwhile, the composite fuel oil additive disclosed by the invention is green and economic, is suitable for industrial production, and can be applied to the fields of ships and the like.