The present invention relates to the preparation of catalysts used in the hydrodesulfurization of fossil fuels and proposes a method for preparing thermally stable, low-cost catalysts for the hydrodesulfurization of petrol and diesel, based on highly active CoMo and NiMo. The catalyst for the hydroprocessing of gasoil or petrol in the present invention comprises a precursor which consists of chemical compounds obtained from organic acids and metal salts, and a support containing an ultra-stable Y-type zeolite useful in the hydroprocessing of heavy gas oil and/or light cyclic gas oil with high conversion rates.

A visible-light-responsive photocatalyst powder includes a tungsten oxide powder. The tungsten oxide powder has color whose a* is 5 or less, b* is 5 or more, and L* is 50 or more when the color of the powder is expressed by an L*a*b* color system. Further, the tungsten oxide powder has a BET specific surface area in a range of 11 to 820 m.sup.2/g.

A mixed metal oxide catalyst for selective hydrogenation of dienes comprising a Group VIII metal, a trivalent metal, a Group IA metal, a Group IVB metal, a Group IIB metal, two Group VIB metals and SiO.sub.2Al.sub.2O.sub.3 as balance. The catalyst comprises 10-40 wt % of Group VIII metal, 5-30 wt % of trivalent metal, 0.1-8 wt % of Group IA metal, 0.1-8 wt % of Group IVB metal, 0.1-30 wt % of Group IIB metal, 5-50 wt % of two Group VIB metals and 10-30 wt % of SiO.sub.2Al.sub.2O.sub.3, based on the catalyst in terms of oxide, and has 150-300 m.sup.2/g of specific surface area, 0.4-0.8 ml/g of pore volume.

A method for producing aromatic hydrocarbons, the method including: (a) bringing a feedstock oil such as an LCO into contact with an aromatic production catalyst to obtain a reaction product containing aromatic hydrocarbons, (b) separating the reaction product into a tower top fraction and a tower bottom fraction using a distillation tower, (c) separating the tower top fraction into a crude aromatic fraction containing an LPG fraction, and an off-gas containing hydrogen, (d) separating the crude aromatic fraction containing an LPG fraction into an LPG fraction and a crude aromatic fraction, (e) separating the off-gas containing hydrogen into hydrogen and an off-gas, and (f) using the hydrogen obtained in step (e) to hydrotreat the crude aromatic fraction, thereby obtaining an aromatic fraction.

New sulfide metal catalysts are described, containing Ni, Mo and W, an element Z selected from Si, Al and mixtures thereof, and possibly an organic residue, obtained by sulfidation of mixed oxide precursors, also new, characterized in that they comprise an amorphous phase and a wolframite iso structural crystalline phase, the crystallinity degree of said mixed oxides being higher than 0 and lower than 100%, preferably higher than 0 and lower than 70%. The catalysts of the invention are useful as hydrotreatment catalysts, and in particular as hydrodesulfurization, hydrodenitrogenation and/or hydrodearomatization catalysts.

There is described a hydroprocessing process of at least one gas oil cut having a weighted mean temperature (TMP) between 240 C. and 350 C. using a catalyst comprising at least one metal of the group VIB and/or at least one metal of the group VIII of the periodic classification and a support comprising an amorphous mesoporous alumina having a connectivity (Z) greater than 2.7, the hydroprocessing process operating at a temperature between 250 C. and 400 C., at a total pressure between 2 MPa and 10 MPa with a ratio of hydrogen volume to volume of hydrocarbon-containing feedstock between 100 and 800 litres per litre and at an Hourly Volume Rate (HVR) which is defined by the ratio of the volume flow rate of liquid hydrocarbon-containing feedstock to volume of catalyst fed into the reactor between 1 and 10 h.sup.1.

A catalyst for producing butadiene using n-butene as a raw material, a process for producing the same and a process for producing butadiene using the catalyst are provided, and specifically, a catalyst for producing butadiene by gas-phase contact oxidative dehydrogenation of n-butene, which is capable of stably producing butadiene in a high yield from the beginning of the reaction, a process for producing the same and a process for producing butadiene, in which the catalyst is a shaped catalyst containing a complex metal oxide having molybdenum as an essential ingredient, wherein the pore volume of macropores is 80% or more, more preferably 90% or more, based on the total pore volume, are provided.

A preparation method of an alumina powder includes the following steps: subjecting the raw material powder having a particle size not exceeding 1,000 mesh to a shear treatment in the presence of a solvent and a polymerization inhibitor to obtain a stable suspension; mixing the suspension with a crystal plane growth guiding agent uniformly and subjecting the mixture to a hydrothermal treatment under a hermetic conditions, then performing a solid-liquid separation, and subjecting the solid to drying and roasting. The alumina powder contains alumina grains having a single-crystal structure and bas an approximate regular octahedral stereoscopic morphology. Eight sides of the alumina grain belong to the {111} family of crystal planes of -state alumina, and the grain size is 5-100 m.

A highly-dispersed hydrogenation catalyst, a preparation method thereof, and use thereof in the preparation of biofuel from palm oil or other oil are provided. The combination of maleic anhydride-grafted polypropylene (MA-PP) and a silane coupling agent (SCA) is introduced into an aluminum oxide composite carrier through organic amidation to obtain a uniformly-dispersed composite carrier with regular pores. Moreover, through a multi-stage impregnation and roasting process, a particle size of an active component is greatly reduced, and the dispersion of the active component and the number of active sites are improved. A hydrogenation catalyst with high hydrothermal stability, high hydrogenation activity, and long life is prepared based on the composite carrier with regular pores and used in the preparation of biofuel from vegetable oil or other oil through hydrodeoxygenation (HDO), which has great industrial application value.

The present invention relates to a hydrocracking catalyst, a process for preparing the same and use thereof The present catalyst comprises a cracking component and a hydrogenation component, wherein the cracking component comprises from 0 to 20 wt. % of a molecular sieve and from 20 wt. % to 60 wt. % of an amorphous silica-alumina, the hydrogenation component comprises at least one hydrogenation metal in a total amount of from 34 wt. % to 75 wt. % calculated by the mass of oxides, each amount is based on the total weight of the catalyst. The present catalyst is prepared by directly mixing an acidic component powder material with an impregnating solution, impregnating, filtering, drying, molding, and drying and calcining.