Multi-metallic bulk catalysts and methods for synthesizing the same are provided. The multi-metallic bulk catalysts contain nickel, molybdenum tungsten, yttrium, and optionally, copper, titanium and/or niobium. The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.

A carbon-based solid acid catalyst, a preparation method of the catalyst, and a method to use the catalyst for hydrothermal conversion of biomass are provided. The preparation method of the carbon-based solid acid catalyst includes the following steps: S1. mixing pectin with water, adding concentrated sulfuric acid for activation, and adding a resulting mixture to an ionic resin with an aromatic ring matrix; S2. drying a material obtained in S1, crushing a dried material into a powder, and subjecting the powder to pyrolysis in a dry inert gas; S3. subjecting a solid obtained after the pyrolysis to sulfonation with concentrated sulfuric acid; S4. diluting a material obtained in S3 with water, filtering a resulting mixture, and washing a resulting filter residue with water until no sulfate ions are detected in washing water; S5. drying the filter residue.

Generally, it is disclosed a catalyst for use in a hydrotreating hydrocarbon feedstocks and the method of making such catalyst. It is generically provided that the catalyst comprises at least one Group VIB metal component, at least one Group VIII metal component, about (1) to (about (30) wt % C, and preferably about (1) to about (20) wt % C, and more preferably about (5) to about 15 wt % C of one or more sulfur containing organic additive and a titanium-containing carrier component, wherein the amount of the titanium component is in the range of about (3) to (about (60) wt %, expressed as an oxide (Ti0.sub.2) and based on the total weight of the catalyst. The titanium-containing carrier is formed by co-extruding or precipitating a titanium source with a Al203 precursor to form a porous support material comprising Al.sub.20.sub.3 or by impregnating a titanium source onto a porous support material comprising Al.sub.20.sub.3.

An alumina grain has a single-crystal structure and has an approximate regular octahedral stereoscopic morphology. Eight sides of the alumina grain belong to the {111} family of crystal planes of γ-state alumina, and the grain size is 5-100 μm. The alumina grain is unique in crystal plane exposure and distribution, simple and feasible in preparation, and low in cost, and has higher operability, and thus has good application prospect in the field of catalysis and adsorption.

Embodiments of the present disclosure are directed to a process for modifying catalysts comprising introducing a precursor agent and hydrogen gas to a conversion reactor; contacting the precursor agent with a conversion catalyst in the conversion reactor, thereby producing an active agent; introducing the active agent to a production reactor; and contacting the active agent with a hydroprocessing catalyst in the production reactor, thereby producing a modified hydroprocessing catalyst.

Embodiments of the present disclosure are directed to a process for modifying catalysts comprising introducing a precursor agent and hydrogen gas to a conversion reactor; contacting the precursor agent with a conversion catalyst in the conversion reactor, thereby producing an active agent; introducing the active agent to a production reactor; and contacting the active agent with a hydroprocessing catalyst in the production reactor, thereby producing a modified hydroprocessing catalyst.

The present invention relates to a catalyst for a hydrogenation reaction and a method for producing the same, and more specifically, to a catalyst for a hydrogenation reaction, wherein the catalyst includes nickel oxide as an active ingredient and copper oxide and sulfur oxide as a promoter, and especially, can control a reduction degree value according to whether or not a passivation layer of a nickel metal is removed.

According to the present invention, when preparing a hydrogenation catalyst including nickel as an active ingredient, the reduction of nickel can be facilitated by using copper and sulfur as a promoter. In particular, the present invention can provide a catalyst which, while having a high nickel content, includes sulfur oxide and nickel oxide in a particular range, and thus exhibits even higher selective reduction degree for olefins while having high activity of the catalyst.

A hydrogenation catalyst contains a hydrogenation catalyst carrier and an active hydrogenation component. The active hydrogenation component includescompriscs a Group VIB metal sulfide and a Group VIII metal compound, and the molar proportion of a substance of the Group VIII metal compound that interacts with the Group VIB metal sulfide to the total amount of the Group VIII metal compound is 60-100%. The hydrogenation catalyst has a higher active metal sulfurizing degree and a higher number of type II active centers, and can be applied to the hydrogenation treatment process of oil products such as distillate oils and residual oils

A hydrogenation catalyst contains a hydrogenation catalyst carrier and an active hydrogenation component. The active hydrogenation component includescompriscs a Group VIB metal sulfide and a Group VIII metal compound, and the molar proportion of a substance of the Group VIII metal compound that interacts with the Group VIB metal sulfide to the total amount of the Group VIII metal compound is 60-100%. The hydrogenation catalyst has a higher active metal sulfurizing degree and a higher number of type II active centers, and can be applied to the hydrogenation treatment process of oil products such as distillate oils and residual oils