30results about How to "Many catalytic active sites" patented technology

The invention provides a carbon/alumina composite carrier catalyst used for hydrazine decomposition reaction and a preparation method thereof. The catalyst showed in the formula is A/C-Al2O3, C-Al2O3 is the carbon/alumina composite carrier, and active constituent A is transition metal Mo, W, Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt or carbonization, nitride and phosphide thereof; wherein, the content of the A is 2-40wt percent and the preparation temperature of the A is 300-900 DEG C. The invention has simple preparation, especially for the preparation of active species of the transitional metal carbonization, which uses H2 instead of CH4/H2 gas used in the past preparation to have direact reduction; the invention prevents carbon deposition on the surface of the carbonization from inactivating, thus being beneficial to acquire more catalytic active sites.

The invention belongs to the technical field of material chemistry, and particularly relates to a macro preparation method for a carbon doped zinc oxide-based visible-light catalyst. The method disclosed by the invention adopts a micro-molecular organic matter combustion-supporting method for macroscopically preparing the carbon commingled zinc oxide-based visible-light catalyst. The preparation principle of the catalyst is that the reaction heat of the combustion of the micro-molecular organic matter at a high temperature is used to realize effective sedimentation and doping of a carbon element in zinc oxide crystals; at the same time, a large number of gases are generated in reaction processes, products can be crushed effectively, so that small-sized carbon doped zinc oxide-based nano particles are obtained, and the macro preparation of the carbon doped zinc oxide-based visible-light catalyst is realized. Prepared nano-powder has the advantages that the dispersibility is good, the particle sizes are small, the sizes are uniform, the visible-light catalytic property is excellent, and the chemical stability is high; at the room temperature of 27 DEG C-33 DEG C and sunlight exposures, the visible-light catalyst can completely degrade an organic dyestuff rhodamine B in 15 minutes, so that the catalyst can be applied to the fields of controlling environmental pollutants and the like.

The invention relates to a catalyst, in particular to phosphorus-doped graphene oxygen reduction electro-catalyst and a preparation method and application thereof. The phosphorus-doped graphene oxygen reduction electro-catalyst contains oxidized graphene substrate and active phosphorus doped or attached to the surface and inside of the oxidized graphene substrate. The preparation method includes the steps of 1, preparing the oxidized graphene; 2, mixing the oxidized graphene with phosphorus-bearing precursor; 3, drying; 4, performing pyrolysis. The phosphorus-doped graphene oxygen reduction electro-catalyst is good oxygen reduction electro-catalyst, is high in catalytic activity and resistant to methanol poisoning and carbon monoxide poisoning, good in stability and capable of serving as electro-catalyst for fuel cells and metal-air cells and serving as electrode active material for electrochemical energy storage and conversion devices such as lithium ion cells, sodium ion cells, lithium-sulfur cells and supercapacitors, and is also applicable to the fields such as electrochemistry/biosensors.

The invention belongs to the technical field of carbon dioxide reduction through electrocatalysis, and particularly relates to a catalyst for carbon dioxide reduction through electrocatalysis and a preparation method thereof. The catalyst is an indium zinc sulfide-MXene composite material. The catalyst has high electrocatalytic activity and selectivity on the carbon dioxide reduction, and significantly improves the energy efficiency for carbon dioxide utilization.

The invention provides a preparation method for high-specific-surface porous carbon modified by coal-tar pitch. The preparation method comprises the following steps: dissolving cobalt nitrate in deionized water, carrying out stirring, and adding ammonia water; adding pitch-based active carbon obtained after one-step activation of coal-tar pitch and carrying out uniform mixing under stirring; subjecting a mixture obtained in the previous step to a hydro-thermal reaction and carrying out centrifugation; washing a solid obtained in the previous step and successively carrying out centrifugation, drying and grinding; and subjecting solid powder obtained after grinding to calcining in a tubular furnace in an inert gas environment so as to obtain the high-specific-surface porous carbon modified by the coal-tar pitch. The invention also provides a method for preparing a membrane electrode assembly for a fuel cell from the high-specific-surface porous carbon modified by the coal-tar pitch. Theporous carbon prepared in the invention has a high specific surface area and a porous structure, which is beneficial for transmission of substances like oxygen, so dependence on the precious metal Ptis greatly reduced; the raw material for preparation of the porous carbon is cheap coal-tar pitch; and the preparation method is simple in process, convenient to operate, low in cost, friendly to environment and suitable for industrial production.

The invention relates to a copper/silver-based electrode taking a conductive bacterial cellulose composite film as a substrate, and the electrode is obtained by taking the composite film as the substrate and carrying out Cu/Ag ion in-situ chemical reduction, catalytic reduction or hydrothermal synthesis. Compared with a traditional electrode taking carbon cloth as a substrate, the catalytic electrode prepared by the invention has higher catalytic efficiency and longer electrode service life due to a three-dimensional nanofiber network structure, a high specific surface area and high conductivity. The preparation method is environmentally friendly, simple in process and short in preparation time. The electrode has good application prospects in the fields of carbon dioxide electrocatalytic reduction, fuel cells, photocatalysis, biocatalysis and the like, and has important significance in environmental protection, energy cyclic utilization and the like.

The invention belongs to the technical field of carbon dioxide reduction through electrocatalysis, and particularly relates to a catalyst for carbon dioxide reduction through electrocatalysis and a preparation method thereof. The catalyst is nitrogen-doped carbon nanofiber composite iron sulfide particles. The catalyst has high electrocatalytic activity and selectivity on the carbon dioxide reduction, in particular, can significantly improve the energy efficiency for carbon dioxide utilization; in addition, the preparation method of the catalyst has the advantages of simple operation, environmental friendliness, high yield, and broad application prospects.

In order to solve the problems that the existing industrial methods for treating dye wastewater are difficult to deal with, the treatment effect is not good and there is a risk of secondary pollution, the present invention proposes a dye wastewater treatment process. A dye wastewater treatment process of the present invention adopts Fe-Ni-Mn/Al ₂ o ₃ Heterogeneous catalyst, the catalyst is added to the dye wastewater, and low-frequency ultrasonic waves are applied to degrade the dye wastewater synergistically, and a saturated gas with an argon-to-air ratio of 1:1 is blown in during the degradation process. The technical effect of the dye wastewater treatment process of the present invention is: the degradation effect on dye wastewater is good, which is better than the sum of the degradation effects of single ultrasonic degradation and direct treatment of dye wastewater by catalysts, and its operation is simple and easy, and the cost is low, which solves the problem of dye wastewater Large output, difficult to degrade and other problems.

The invention relates to an imidazole ionic liquid, a polyionic liquid, and preparation methods and applications of the imidazole ionic liquid and the polyionic liquid. The structural formula of the polyionic liquid is shown in the specification, wherein a is equal to 100-1000, b is equal to 100-1000, and the number-average molecular weight of the polymer ranges from 10,000 to 700,000. According to the preparation method which is a two-step synthesis method, (S)-1-amino-3-chloro-2-propanol hydrochloride is bonded to 1-vinylimidazole through a halogenation reaction by virtue of a two-step synthesis method; and in the second step, radical polymerization is performed on the chlorinated 1-vinyl-3-(1-amino-2-propanol) imidazole to generate a new substance that is the polyionic liquid. The imidazole ionic liquid and the polyionic liquid can be used as catalysts for preparing propylene carbonate, and the conversion rate and the selectivity can be improved.

The invention relates to a method for producing 4-hexene-3-one by dehydration of 4-hydroxyl-3-hexanone and mainly solves the problem that catalysts are low in activity, high in reaction temperature and low in space velocity in the prior art. The 4-hydroxyl-3-hexanone is used as material to contact with catalyst at the reaction temperature of 200 DEG C-400 DEG C at weight hourly space velocity of 0.5-15 hours-1 relative to the 4-hydroxyl-3-hexanone so as to generate 4-hexene-3-one. The catalyst is molecular sieve ZSM-11 (zeolite socony mobil-11). The problem is solved well by the application of the technical scheme. The method is applicable to industrial production of 4-hexene-3-one by 4-hydroxyl-3-hexanone.

The invention belongs to the technical field of electrochemical reduction of carbon dioxide, and specifically relates to a catalyst for the electrochemical reduction of carbon dioxide and a preparation method of the catalyst. The catalyst is a composite material of copper oxide-cuprous oxide composite graphene. The catalyst has high electrocatalytic activity and selectivity on the reduction of carbon dioxide, and in particular, can significantly improve the energy efficiency of carbon dioxide utilization; in addition, the preparation method has the advantages of simple operation, greenness, high yield, and broad application prospects.

The invention belongs to the technical field of a catalyst, and particularly relates to a preparation method of a methane reforming reaction catalyst. The method comprises the following steps of (1) performing raw material mixing to obtain a mixed reagent; (2) uniformly mixing the mixed reagent obtained in the step (1) with expanded perlite; performing ball milling for 30 to 50h at the temperatureof 60 to 90 DEG C to obtain black slurry; (3) performing sublimation drying and crushing on the black slurry obtained in the step (2) at low temperature and low pressure; then, introducing ammonia gas at the temperature being 700 to 900 DEG C; performing roasting for 4 to 8h; performing cooling to obtain light-weight solid materials; (4) dissolving light-weight solid materials obtained in the step (3) into water being 2 to 6 times of the mass of the light-weight solid materials; then, using an ultraviolet light source for radiation treatment; performing drying; obtaining a finished product. The catalyst prepared by the method has the advantages that the reaction temperature of the methane and carbon dioxide is reduced; in addition, the surface active sites and the pore structures of the catalyst are stable, so that the service life of the catalyst is long.