The invention relates to a method for preparing a hydrogenation catalyst or catalyst precursor comprising a catalytically active material and a carrier material. The method involves the mixing of an acidic solution comprising metal ions of a metal selected from the IUPAC group 8, 9 or 10 metals, preferably cobalt, a suspension comprising the carrier material and an alkaline solution. The invention also relates to a precursor of a hydrogenation catalyst wherein the precursor comprises crystallites of metal oxides having an average size of max. 8 nm.

A cobalt catalyst precursor is described comprising cobalt oxide crystallites disposed within pores of a titania support, wherein the cobalt oxide crystallites have an average size as determined by XRD in the range 6 to 18 nm, and the titania support is a spherical titania support with a particle size in the range 100 to 1000 μm, wherein the catalyst precursor has a pore volume of 0.2 to 0.6 cm.sup.3/g and an average pore diameter in the range 30 to 60 nm, and wherein the catalyst precursor has a ratio of the average cobalt oxide crystallite size to the average pore diameter in the range 0.1:1 to 0.6:1. The catalyst precursor may be reduced to provide catalysts suitable for use in Fisher-Tropsch reactions.

The present invention belongs to the technical field of supported catalysts, and discloses a supported core-shell structured ZnO catalyst, and a preparation method and use thereof. With Al.sub.2O.sub.3 as a support and ZnO as active sites, the catalyst is characteristic of a NiZn@ZnO core-shell structure, which consists of a NiZn alloy core and a ZnO shell The preparation method comprises firstly dissolving Ni(NO.sub.3).sub.3.6H.sub.2O and Zn(NO.sub.3).sub.2.6H.sub.2O in deionized water; then impregnating Al.sub.2O.sub.3 with the solution described above, followed by uniform ultrasonic dispersion and complete drying; and finally the obtained solid is calcinated and reduced to obtain the target catalyst, which exhibits high activity, selectivity and stability. The catalyst can be used for the dehydrogenation of light alkanes to alkenes, especially in dehydrogenation of propane to propylene.

An aromatization catalyst and preparation process and use thereof is set forth. The catalyst comprises an inorganic oxide and a modified Ga-ZSM-5 zeolite, which comprises a modified ZSM-5 zeolite with a hierarchical macro-meso-microporosity and gallium deposited in channels of and/or on surfaces of the modified ZSM-5 zeolite. The hierarchical porosity of the modified ZSM-5 zeolite in the catalyst can reduce diffusion resistance of products during the aromatization reaction, thereby retarding carbon depositing rate and substantially improving catalytic activity, aromatic hydrocarbon selectivity, stability and lifetime of the catalyst. When being used in aromatization of propane, the catalyst exhibits a high stability, a lifetime of more than 320 hours, and a selectivity to aromatic hydrocarbons of up to 73.3 wt. %.

The present invention relates to a process for the liquid phase activation of catalysts. Such activated catalysts have particular utility in hydrogenation of aldehydes to alcohols. As such, the present invention relates to a process for the hydrogenation of aldehydes to alcohols in the presence of a catalyst which has been activated in accordance with the first aspect of the present invention.

The present disclosure provides a method for fabricating a heterogeneous nickel-based catalyst on an aluminum oxide support. The method includes a solution preparation step, a drop-cast step, a first calcining step, and a second calcining step. The solution preparation step is provided for preparing a precursor solution. The drop-cast step is provided for dropping the precursor on the support. The first calcining step is provided for obtaining an oxidation state catalyst. The second calcining step is provided for obtaining the heterogeneous nickel-based catalysts on aluminum oxide support.

A process for synthesis of PtNi high surface area core/shell particles. The processing including formation of PtNi nanoparticles, exposure of the PtNi nanoparticles to oxygen to form a nickel oxide coating on the nanoparticles at the same time the segregation of Ni to surface induces a Pt-skin with PtNi core structure, removal of the nickel oxide coating to form PtNi core/Pt shell (or Pt-skin) structure.

The present invention relates to heterogeneous catalysts and methods of making and using the same. In various embodiments, the present invention provides a method of making a hydrogenation catalyst including particulate nickel metal (Ni(0)). The method includes calcining first nickel(II)-containing particles in an atmosphere including oxidizing constituents to generate second nickel(II)-containing particles. The method also includes reducing the second nickel(II)-containing particles in a reducing atmosphere while rotating or turning the second nickel(II)-containing particles at about 275° C. to about 360° C. for a time sufficient to generate the particulate nickel metal (Ni(0)), wherein the particulate nickel metal (Ni(0)) is free flowing.

A catalyst comprising: a titanium oxide having an anatase-type crystal structure, and having the vertices and the ridge lines, wherein in a single titanium oxide particle, a vertex density per unit surface area is 8.0×10.sup.−4 nm.sup.−2 or more, and a ridge line density per unit surface area is 5.0×10.sup.−2 nm or more, or a ridge line density per unit volume is 8.0×10.sup.−3 nm.sup.−2 or more. A complex comprising: a material having a porous structure; and said catalyst. A membrane electrode assembly comprising: an anode; cathode; and an electrolyte membrane, wherein the cathode carries said catalyst on at least a surface of the cathode.

Disclosed is a ruthenium-based catalyst for ammonia synthesis, preparation method and use thereof. The ruthenium-based catalyst comprises Ru—Ba-A core-shell structure which comprises a ruthenium nanoparticle as a core covered with a first shell and a second shell sequentially, wherein the first shell consists of a barium nanoparticle, and the second shell consists of a metal oxide. The Ru—Ba-A core-shell structure can effectively preventing agglomerations of ruthenium nanoparticles during the use of the catalyst and avoiding direct contact between the ruthenium nanoparticles and the metal oxides. In addition, barium nanoparticles have a promoting effect as an electronic promoter, which can effectively improve the stability and catalytic activity of ruthenium-based catalyst for ammonia synthesis, especially in the system for synthesizing ammonia from a coal gas.