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

The invention relates to a copper / silver-based electrode with a conductive bacterial cellulose composite film as a substrate. The composite film is used as a substrate for the electrode, and the electrode is obtained by in-situ chemical reduction, catalytic reduction or hydrothermal synthesis of Cu / Ag ions. Compared with the traditional electrode based on carbon cloth, the catalytic electrode prepared by the present invention has a three-dimensional nanofiber network structure, high specific surface area and high electrical conductivity, so it has higher catalytic efficiency and longer electrode life. The preparation method is green and environment-friendly, has simple process and short preparation time. The electrode has good application prospects in the fields of electrocatalytic reduction of carbon dioxide, fuel cells, photocatalysis, biocatalysis, etc., and is of great significance to environmental protection and energy recycling.

The invention provides a catalyst for electrochemical reduction of carbon dioxide. The catalyst is characterized by comprising coralline-shaped nanometer stannous oxide. The preparation method of the coralline-shaped nanometer stannous oxide comprises the following steps of dissolving urea and stannous chloride in deionized water to obtain a catalyst precursor; placing the catalyst precursor in a reaction kettle; carrying out hydrothermal reaction and centrifugal separation; washing and centrifugally separating the obtained solid; and drying the solid to obtain the coralline-shaped nanometer stannous oxide. The stannous oxide catalyst provided by the invention is presented with a particular root-shaped coral stacked morphology, is provided with vivid crystal surfaces (101) and (102), and is compatible with high electrocatalytic activity and selectivity on reduction of the carbon oxide, and the utilization energy efficiency of the carbon oxide can be particularly and remarkably improved. Further, the preparation method of the catalyst, provided by the invention, has the advantages of simplicity in operation, greenness, high yield and wide application prospect.

The invention relates to a slurry reactor nickel-based methanation catalyst prepared according to a sediment burning method and an application thereof. The invention relates to a methanation nickel-based catalyst prepared according to the sediment burning method and a preparation method thereof. The methanation catalyst comprises the following raw materials by mass percent: 15-50wt% of Ni, 47-80wt% of Al2O3 and 1-10wt% of auxiliaries, wherein the auxiliaries are selected from one or two of Dy2O3, La2O3, Eu2O3 and Gd2O3; the grain size of the catalyst is 60-220 meshes; the specific surface area is 150-250 m<2> / g; the Ni crystal grain size is 12-16nm. The methanation catalyst provided by the invention has the advantages that the preparation process is simple, the preparation period is short and the activity and selectivity in the slurry reactor methanation reaction are high.

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, low 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 the 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 adhesive-free ZSM-5 (zeolite socony mobil-5). 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 present invention relates to a polyformaldehyde dimethyl ether preparation method, wherein the problem that the catalyst has corrosion in the prior art is mainly solved with the present invention. The technical scheme comprises that: methanol or dimethyl ether, and formaldehyde or trioxymethylene are adopted as raw materials, a molar ratio of the methanol or the dimethyl ether to the formaldehyde or the trioxymethylene is 1:0.1-10, and the reaction raw materials contact a catalyst at a reaction temperature of 50-200 DEG C under a reaction pressure of 0.1-10 MPa to produce polyformaldehyde dimethyl ether, wherein the catalyst is at least the one selected from a binder-free ZSM-5 molecular sieve and a binder-free ZSM-11 molecular sieve. With the technical scheme, the problem in the prior is well solved, and the method can be used for industrial production of polyformaldehyde dimethyl ether.

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 the technical fields of nucleation of a metal oxide nanometer catalyst, growth control, doping modification, environmental catalytic purification, micro-arc oxidization, nanometer materials and nano-technologies, in particular to an in-situ growth and doping modification method for the metal oxide nanometer catalyst. According to the in-situ growth and doping modificationtechnology for the metal oxide nanometer catalyst, a micro-arc oxidization method is mainly utilized for directly growing a metal oxide nanometer catalyst material on the surface of a metal substrate,and the metal oxide nanometer catalyst material is subjected to doping modification. The prepared metal oxide nanometer catalyst is good in crystallinity, large in active area, relative uniform in size, uniform in growth and distribution, and applicable to the fields of automobile tail gas treatment, denitration and desulfurization treatment, industrial waste gas treatment, CO catalytic oxidization and relevant environmental catalytic purification.

The invention relates to a titanium-based Sn-Sb-Ce oxide electrode and its preparation method and application, which has a multi-level structure, and the titanium-based surface layer Sn-Sb-Ce oxide is a spherical nano-ternary multilayer structure. The preparation method includes: immersing the pretreated titanium substrate in an electroplating solution prepared by mixing Sn source, Sb source, Ce source, glucose and nitric acid for electroplating to obtain an electroplated titanium substrate; dissolving the Sn source, Sb source, Ce source, and glucose Perform hydrothermal reaction in a mixed solution of ethanol and deionized water to obtain Sn-Sb-Ce oxide; add ethylene glycol citrate to coat on the electroplated titanium base, and then calcinate to obtain it. The Sn-Sb-Ce oxide in the present invention has a special spherical shape and has both high electrocatalytic activity and selectivity for organic oxidation. The preparation method adopted in the invention is green and environment-friendly, has low cost, greatly reduces the dependence on the noble metal Pt, and has broad application prospects.