Disclosed are a tandem catalyst for synthesizing methyl acetate from carbon dioxide, a method for preparing the same, and a method for preparing methyl acetate using the same. The tandem catalyst of the present invention includes a first catalyst having a core-shell structure including a composite metal oxide core and a silica shell surrounding a surface of the composite metal oxide core, and a second catalyst including nano-ferrierite (N-FER) zeolite.

The present invention relates to a composition based on Al and Ce in the form of oxides (composition C1); or based on Al, Ce and La in the form of oxides (composition C2), with the following proportions: the proportion of CeO.sub.2 is between 3.0 wt % and 35.0 wt %; the proportion of La.sub.2O.sub.3 (for composition C.sub.2 only) is between 0.1 wt % and 6.0 wt %; the remainder as Al.sub.2O.sub.3; exhibiting the following porosity profile: a pore volume in the range of pores with a size of between 5 nm and 100 nm which is between 0.35 and 1.00 mL/g; anda pore volume in the range of pores with a size of between 100 nm and 1000 nm which is less than or equal to 0.15 mL/g, these pore volumes being determined by means of the mercury porosimetry technique; and the following properties: a mean size of the crystallites after calcination in air at 1100? C. for 5 hours (denoted D1100? C.-5 h) which is lower than 45.0 nm, preferably lower than 40.0 nm; a mean size of the crystallites after calcination in air at 900? C. for 2 hours (denoted D900? C.-2 h) which is lower than 25.0 nm, preferably lower than 20.0 nm, even more preferably lower than 15.0 nm; andan increase ?D of the mean size of the crystallites lower than 30.0 nm, preferably lower than 25.0 nm, ?D being calculated with the following formula: ?D=D.sub.1100?C-2h-D.sub.900C-5h; the mean size of the crystallites being obtained by XRD from the diffraction peak [111] of the cubic phase corresponding to cerium oxide, generally present at 2? between 28.0 and 30.0.

A method of producing a hierarchical zeolite composite catalyst. The method including dissolving, in an alkaline solution and in the presence of a surfactant, a catalyst precursor comprising mesoporous zeolite to yield a dissolved zeolite solution, where the mesoporous zeolite comprises large pore mordenite and medium pore ZSM-5. The method also including condensing the dissolved zeolite solution to yield a solid zeolite composite from the dissolved zeolite solution and heating the solid zeolite composite to remove the surfactant. The method further including impregnating the solid zeolite composite with one or more active metals selected from the group consisting of molybdenum, platinum, rhenium, nickel, and combinations thereof to yield impregnated solid zeolite composite and calcining the impregnated solid zeolite composite to produce the hierarchical zeolite composite catalyst. The hierarchical zeolite composite catalyst has a mesostructure comprising at least one disordered mesophase and at least one ordered mesophase.

An iridium-ruthenium-based oxide anode catalyst for water electrolysis includes a heterostructure within the particles, different phases within the particles being adjacent to each other, and the different phases within the particles consist of iridium and ruthenium, the catalyst is synthesized using metal sulfides (MxS) as precursors, and the catalyst is characterized by the introduction of transition metal elements as dopants.

Disclosed are methods for conversion of ?-hydroxy carbonyl species and preparation of amino alcohol precursor using bifunctional catalysts derived from layer double hydroxides. By the bifunctional catalyst, the abundant basic sites on HTO allow retro-aldol condensation to outpace direct hydrogenation, thus achieving an exceptional selectivity towards a desired product produced through retro-aldol condensation and then hydrogenation. Accordingly, this method exhibits particular utility in the renewable production of N-acetylethanolamine from biomass-derived N-acetyl glucosamine (GlcNAc) without using homogeneous base as a co-catalyst.

Catalyst compositions containing red mud and rhodium are provided. An exemplary catalyst composition includes about 50 wt % to about 99 wt % of a mixed-oxide material including iron oxide, aluminum oxide, and silicon oxide, and about 1 wt % to about 40 wt % of rhodium oxide, calculated as Rh.sub.2O.sub.3.

A novel mixed metal molybdate useful as a hydroprocessing catalyst or catalyst precursor has been created. The hydroprocessing using the novel mixed metal molybdate material or the decomposition product thereof may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

A hydroprocessing catalyst or catalyst precursor has been developed. The catalyst is a unique crystalline ammonia transition metal molybdotungstate material. The hydroprocessing using the crystalline ammonia transition metal molybdotungstate material or a decomposition product thereof may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

A photocatalyst in the form of chloroplast-like heterostructures of Bi.sub.2S.sub.3ZnS is disclosed. Additionally, methods for producing the chloroplast-like heterostructures of Bi.sub.2S.sub.3ZnS with controlled morphology, as well as methods for the photocatalytic production of hydrogen gas under visible light irradiation employing the chloroplast-like heterostructures of Bi.sub.2S.sub.3ZnS are disclosed.

Active catalysts for the treatment of a low temperature exhaust gas stream are provided containing copper oxides dispersed on a spinel oxide for the direct, lean removal of nitrogen oxides from the exhaust gas stream. The low temperature, direct decomposition is accomplished without the need of a reductant molecule. In one example, CuO.sub.x may be dispersed as a monolayer on a metal oxide support, such as Co.sub.3O.sub.4 spinel oxide, synthesized using an incipient wetness impregnation technique. The CuO.sub.x/Co.sub.3O.sub.4 catalyst system converts nitric oxide to nitrogen gas with high product specificity, avoiding the production of a significant concentration of the undesirable N.sub.2O product.