33results about How to "Good catalytic hydrogenation performance" patented technology

The invention provides a graphene loaded high-dispersion nano Ni catalyst as well as a preparation method and application thereof. The catalyst is obtained by loading high-dispersion Ni nano-metal on the surface of graphene, and doping less amorphous Al2O3, wherein the mass percent content of graphene is 40-67%, the mass percent content of Ni is 10-40%, the mass percent content of amorphous Al2O3 is 2-8%, the size distribution of Ni particles is 8-13nm, and the specific area of the catalyst is 155-200 m<2> / g. The preparation method comprises the following steps of: preparing a graphene / lamellar bimetal hydroxide composite material in one step through the hydroxide precipitation and reduction effect, and then preparing the graphene loaded high-dispersion metal Ni nano catalyst through an in-situ self-reduction method by using the reducibility of graphene. The catalyst is used for selectively hydrogenating the cinnamyl aldehyde to synthesize the benzenepropanal, and the conversion rate and the benzenepropanal selectivity are respectively 86-100% and 88-96%.

A catalyst for the selective catalytic hydrogenation of naphthalene to prepare tetrahydronaphthalene, its preparation method and application. Compared with naphthalene, tetralin is a high-value product, and the method can realize high added value and deep processing of downstream products of coal tar. use. The method adopts a high-temperature and high-pressure reactor, and it is found for the first time that the catalyst in an oxidation state has a significant effect on the selective hydrogenation of naphthalene to prepare tetrahydronaphthalene. Wherein the hydrogenation catalyst used is composed as follows: with γ-Al 2 o 3 as carrier, Ni and Mo as active metals, Al 2 o 3 The content of the carrier is 70%-90%, the total loading of Ni and Mo is 12%-36%, and the loading ratio of Ni and Mo is 1:23-8:16. The invention proposes a high additional utilization method of downstream products of coal tar which has been neglected by people, and the used oxidation state catalyst has the advantages of simple preparation, easy storage, good cycle stability, easy regeneration and the like.

The invention provides a carbon supported core-shell structure nano metal catalyst as well as a preparation method and application thereof. The carbon supported metal catalyst with the core-shell structure is obtained by compounding layered double-metal hydroxides containing cobalt and nickel and beta-cyclodextrin and self-reducing the compound in situ at a high temperature by means of the reducibility of generating carbon at the high temperature of the beta-cyclodextrin; the carbon supported metal catalyst with the core-shell structure can be expressed as M / ZnO-Al2O3 / C; and the core of the carbon supported metal catalyst is formed by nano metal M (M is Co or Ni), and the shell of the catalyst is formed by ZnO and little amorphous Al2O3; amorphous carbon serves as the catalyst carrier; the grain sizes of the core-shell structure nanoparticles are distributed in the range of 15-40 nm; and the specific surface area of the catalyst is 150-350 m<2> / g. The carbon supported metal catalyst is applied to hydrogenation reaction of citronellal and shows excellent activity; and the carbon supported metal catalyst has high selectivity for the product citronellal.

The invention provides a magnetic cobalt, carbon and attapulgite composite material, and a preparation method and an application thereof. The composite material is a multilayer structure with attapulgite as a carrier, the surface of the carrier is coated with a carbon nanotube layer, pores in the nanotube layer and pores in the attapulgite are filled with cobalt nanoparticles, and the surface of the carbon nanotube layer is coated with a cobalt nanoparticle layer. The preparation method comprises the following steps: acidifying attapulgite to obtain modified attapulgite; carrying out carbon source adsorption on the modified attapulgite, and calcining and etching the treated modified attapulgite to obtain porous carbon coated attapulgite; and adding a cobalt chloride solution and a sodium borohydride solution to the porous carbon coated attapulgite, performing a sufficient reaction, and drying the obtained reaction product to obtain the magnetic cobalt, carbon and attapulgite compositematerial. When the composite material is applied to the adsorption of Congo red in dye wastewater, the maximum equilibrium adsorption capacity can reach 459 mg / g; and when the composite material is applied to the hydrogenation of p-nitrophenol, the hydrogenation of p-nitrophenol is completed within 8 min.

A method for hydrodesulfurization of coked benzene, wherein the preparation process of the hydrodesulfurization catalyst used in the hydrodesulfurization reaction is: adding aluminum oxide and titanium dioxide mixed powder carriers to solutions containing molybdenum, nickel, cobalt, and tungsten active metal elements respectively The solution contains citric acid; the NaZSM‑5 molecular sieve is added to the solution containing copper and / or zinc for impregnation; after drying and roasting, the two are mixed, and the coking benzene is treated by a rectification tower before hydrodesulfurization , and then complete sulfur removal through pre-hydrogenation, main hydrogenation and inorganic sulfur removal processes. The NaZSM-5 molecular sieve loaded with active ingredients has a selective adsorption effect on thiophene; the mixed powder of aluminum oxide and titanium dioxide loaded with active metals has a good catalytic hydrogenation effect on thiophene, and the two synergistically work together to achieve a low reaction rate. Excellent removal effect can also be achieved at low temperature, citric acid can promote the formation of active phase, improve the hydrogenation activity of the catalyst and prolong the retention time of the catalyst activity.