63results about How to "Pore ​​structure is suitable" patented technology

The invention relates to a metal-free nitrogen-doped functionalized mesoporous carbon catalyst and preparation method and applications thereof. A precursor of the metal-free nitrogen-doped functionalized mesoporous carbon catalyst comprises the following components in percentage by mass: 20-85% of template agent, 10-75% of nitrogen compound, and 5-50% of transition metal salt. The nitrogen compound is carbonized at high temperature under the existence condition of transition metal, to form a high-nitrogen-content pyridine and graphite nitrogen (Nx-C) composite structure, and the catalytic activity of oxygen can be remarkably enhanced; the transition metal in the nitrogen-doped mesoporous carbon catalyst can be removed through acid pickling, so that the inactivation (corrosion) of the catalyst containing the transition metal under the conditions of strong acid and strong alkali can be avoided, the characteristics of being high in stability, not easy to poison and the like can be achieved, and the metal-free nitrogen-doped functionalized mesoporous carbon catalyst has excellent application prospects in the fields of treating waste water of fuel batteries, metal-air batteries, supercapacitors, energy-storage batteries, microbial fuel cells, and the like.

The invention provides a gas diffusion layer for unitized regenerative fuel cell, and its preparation method. The gas diffusion layer comprises nonconductive organic synthetic fiber cloth as a support body, and conductive corrosion-resistance metal/metal oxide network formed on the support body and filled in the pores of the organic fibers. The gas diffusion layer further comprises a hydrophobic agent and a binder for achieving proper hydrophilic-hydrophobic property and good pore structure, so as to ensure mass transfer balance of the URFC in different work modes. The invention solves the corrosion problem of existing URFC support body, increases gravimetric specific power, and lowers electrode cost.

The invention discloses a residual oil hydrotreating catalyst and a preparation method thereof. In the catalyst, the active metal constituents are Group VIII metals and Group VIB metals; and the supporter is composed of aluminum oxide and mesoporous molecular sieve, wherein the mesoporous molecular sieve accounts for 4.5-9.5 wt% of the supporter. In the catalyst supporter preparation process, a proper amount of alkaline nitrogen-containing compound is added into the raw materials quasi-boehmite, aluminum oxide powder and mesoporous molecular sieve; and due to the actions of blending and sintering, the prepared catalyst has large specific area, large pore size and proper pore structure, reduces the diffusion restriction of the reactants, is suitable for catalyzing macromolecule-participated reactions, has proper acid value and improved wear resistance, and maintains the desulfurization activity on the premise of enhancing the hydrogenation demetallization and deasphaltenizing activities.

The present invention provides a hydrodesulfurization catalyst, which comprises a modified titania-alumina composite carrier and nickel phosphide loaded on the carrier, wherein the modified titania-alumina composite carrier comprises an alkaline earth metal component and a group VIB metal component. The catalyst of the present invention has low temperature hydrogenation activity and good stability when the catalyst is used for the C5-C9 distillate oil hydrodesulfurization process. The present invention further provides a preparation method of the catalyst and a C5-C9 distillate oil hydrodesulfurization method.

A preparation method and an application method of a non-noble metal reforming catalyst. The catalyst comprises a Ni2P active component and a composite carrier. The composite carrier comprises gama-Al2O3 and SAPO-11. The preparation method comprises the following steps: firstly, adding sesbania powder into raw materials of aluminium hydroxide dry gel powder, pseudo-boehmite and SAPO-11, then adding nitric acid aqueous solution, performing kneading, strip extrusion, air drying, drying and roasting to prepare a composite carrier of gama-Al2O3-SAPO-11; secondly, preparing a nickel hypophosphite impregnation liquid at 60-80 DEG C, controlling the molar ratio of phosphorus to nickel, impregnating the composite carrier by constant temperature supersaturation impregnation, performing air drying and vacuum drying to obtain a catalyst precursor; finally, putting the catalyst precursor in a tubular furnace, and roasting in N2 to prepare the Ni2P/gama-Al2O3-SAPO-11 catalyst. Compared with the prior art, the preparation method is simple in process, low in preparation temperature, and mild in reaction conditions; the prepared catalyst is high in dispersity, can be used in naphtha reforming reaction, has high aromatic hydrocarbon yield and activity stability, and is low in price.

The invention discloses a catalyst for preparing meta-xylylenediamine and application of the catalyst, and belongs to the field of hydrogenation catalysts. Alumina or a mixture of magnesium and aluminum is adopted as a carrier, the active element is Ni, and the auxiliary agent 1 is one of Co and Mn; and the auxiliary agent 2 is one of Na and K, and preparation of the catalyst comprises the steps of preparation of the catalyst carrier, impregnation of the active component, impregnation of the auxiliary agents and activation of the catalyst. A preparation method has a simple process and low cost, and is suitable for industrial production, and the catalyst has suitable pores; through addition of the suitable additives, the reaction process conditions are optimized, and the catalyst has the characteristics of high activity, no easy clogging of the pores, a long service life and the like; and when the catalyst is applied to preparation of meta-xylylenediamine through hydrogenation of isophthalonitrile, the conversion rate of isophthalonitrile is 100%, and the selectivity to meta-xylylenediamine is 99% or above.

The invention discloses a magnetic graphene oxide/sodium alginate/carboxymethyl cellulose composite material and a preparation method thereof. The method comprises the following steps: preparing magnetic graphene oxide by adopting a chemical coprecipitation method, and preparing the magnetic graphene oxide/sodium carboxymethyl cellulose/sodium alginate composite material from the magnetic grapheneoxide, sodium carboxymethyl cellulose and sodium alginate by adopting an ion exchange method. The composite material provided by the invention contains rich active functional groups, can generate a relatively strong coordination effect with heavy metal ions, improves the adsorption performance of the composite material on the heavy metal ions, has the maximum adsorption capacity of 92.6 mg/g, andis suitable for heavy metal ion adsorption treatment.

The invention relates to a membrane electrode for a proton exchange membrane fuel cell and a preparation method of the membrane electrode. The preparation method comprises the following steps: A, spinning catalyst slurry onto a microporous layer on the surface of hydrophobic carbon paper by adopting a variable-voltage electrostatic spinning process to obtain a gas diffusion catalyst layer integrated electrode; B, assembling according to the assembly sequence of the gas diffusion catalyst layer integrated electrode, the proton exchange membrane and the gas diffusion catalyst layer integrated electrode, and after assembly, preparing the membrane electrode for the proton exchange membrane fuel cell through a hot pressing or cold pressing process. The catalyst layer is directly spun on the gas diffusion layer by means of an electrostatic spinning technology, the thickness of the catalyst layer and the loading capacity of a catalyst are reduced, the dispersity of the catalyst is improved, and a fibrous structure obtained through spinning is good in uniformity and rich and moderate in pore structure; water transmission and air mass transfer in a high-current density area of the fuel cell are improved, and the cell performance is improved.

The invention discloses a method for preparing a hydrofining catalyst. According to the hydrofining catalyst, firstly, a mixed solution A containing Ni and W and a sodium metaaluminate alkaline solution react in a parallel flow manner, obtained slurry is aged, then, a mixed solution B containing W, Mo and Al components and ammonia water are added to the aged slurry in a parallel flow manner, agingis performed, then, first drying, forming and second drying are performed, treatment is performed with a mixed aqueous solution of aluminum salt and organic acid, washing, third drying, calcination and other steps are performed, and the hydrofining catalyst is prepared. The catalyst can be applied to super deep hydrodesulfurization and hydrodenitrification reactions of diesel fractions, has higher hydrodesulfurization and hydrodenitrification reaction activity and is particularly applied to tretament of diesel materials with high nitrogen and sulfur content.

The invention relates to a method for preparing alkene from light alkane dehydrogenation, and mainly solves the problems of low dispersion, easy aggregation crystallization of active components, low selectivity under high temperature and poor one-way stability in the existing vanadium-based catalyst under high loading. The invention provides a vanadium-based catalyst for light alkane dehydrogenation to produce alkene and a preparation method thereof. The catalyst uses a silicon-based material as a carrier, vanadium or its oxide as the active component, and uses a synthetic method for preparation. Under the condition of low O2 concentration, a combined oxidative dehydrogenation and direct dehydrogenation method s used for catalysis of alkane preparation from alkane dehydrogenation; and finally the catalyst is subjected to charking for regeneration. The technical scheme well solves the above problems, and can be used for in the industrial production of alkene preparation from light alkane dehydrogenation.

The invention discloses light-hydrocarbon isomerization catalyst and a method for preparing the light-hydrocarbon isomerization catalyst. Resin ribbon ball-shaped active carbon having high specific surface area and a micro-hole structure serves as the carrier, is roasted under high temperature and is activated through hydrogen fluoride to obtain a carrier with high specific surface area and a mesoporous structure, palladium loading is then carried out according to a liquid phase deposition method, and modifying is carried out through fluorine-containing chlorides at the same time to obtain the light-hydrocarbon isomerization catalyst. The light-hydrocarbon isomerization catalyst has extremely large specific surface area and a proper hole structure, and has good isomerization performance after modifying is carried out through the fluorine-containing chlorides. High activity of the light-hydrocarbon isomerization catalyst can still be kept after long-period operation and the light-hydrocarbon isomerization catalyst is long in service life.