7results about How to "Improve hydrogenation performance" patented technology

The application discloses a method for cracking tar into high value-added products, which adopts a route of separating light components by fractional distillation and then hydrogenating heavy components, so that the yield of target products can be affected by hydrogenation of naphthalene, methyl naphthalene and the like below 250 DEG C in the process of hydrocracking, and on the other hand, the components below 250 DEG C account for about 30% to 50%, so that the hydrogen consumption in the subsequent hydrocracking can be reduced by separating the components in advance. After the heavy fraction is subjected to hydrocracking, part of polycyclic aromatic hydrocarbons in the heavy fraction can be cracked into part of monocyclic aromatic hydrocarbons, which can be used for producing aromatic solvent oil, so that the light fraction in the hydrocracking product is separated and mixed into the light fraction generated by pre-fractionation, and the next step processing is carried out, so that the yield of high value-added products can be further improved.

The application provides a titanium dioxide type low-temperature hydrogenolysis catalyst and a preparation method and application thereof. The catalyst comprises a titanium dioxide carrier and an active component loaded on the titanium dioxide carrier, and the active component comprises scandium oxide and tungsten oxide. The preparation method of the catalyst comprises the following steps: dipping the titanium dioxide carrier in a mixed solution of scandium salt and tungsten salt for a period of time, so that the scandium salt and the tungsten salt are loaded on the titanium dioxide carrier; and then drying and calcining the titanium dioxide carrier loaded with the scandium salt and the tungsten salt, to obtain the titanium dioxide type low-temperature hydrogenolysis catalyst. The catalyst has good sulfur dioxide hydrogenation activity and organic sulfur hydrolysis activity, and can be applied to a process for treating sulfur recovery tail gas at a low temperature of 210-220 DEG C.

This invention discloses a magnesium-aluminum layered double hydroxide (MLD)-based solid alkali-supported ruthenium catalyst, its preparation method, and its application, belonging to the field of chemical catalytic materials technology. This invention uses magnesium-aluminum MLD as a support, metallic ruthenium as the hydrogenation active component, and magnesium oxide as the alkaline component. The preparation method involves mixing an aqueous dispersion of magnesium-aluminum MLD with frozen magnesium salt and an alkaline solution. The core step is to utilize a freeze-thaw process to perform high-dispersion exfoliation and hydrolysis reactions between the magnesium-aluminum MLD layers, generating magnesium hydroxide attached to the support. This magnesium hydroxide is then pyrolyzed to form a MgO / LDHs solid alkali catalyst precursor. This precursor is dispersed in water, mixed with an aqueous ruthenium salt solution, and reduced with a reducing agent solution to obtain the final catalyst. The freeze-thaw process of this invention significantly improves the dispersibility of the active component, achieving a catalyst specific surface area of ​​185 m² / g and a pore volume of 0.28 m³ / g. Applied to the selective hydrogenation reaction of nitrobenzene using methanol as a hydrogen source, no external alkali is required, achieving a nitrobenzene conversion rate of 61.50% and an aniline selectivity of 100%.

This invention discloses a catalyst for the hydrogenation of dry gas to produce low-carbon hydrocarbons and its preparation method. The catalyst comprises a support a of activated magnesium oxide and a support b of alumina; the active components are group VIB metal sulfides and group VIII metal sulfides, and the active promoters are one or more of Cu, Ag, Ni, Co, W, and Mo; the total acid content of the catalyst is 0.1~0.3 mmol / g, of which strong acids at 400-500℃ account for 5-15%, moderately strong acids at 250-400℃ account for 10-20%, and weak acids at 150-250℃ account for 65%-85%. The preparation method is as follows: the alumina and magnesium oxide impregnated with the active components are separately calcined at high temperatures, then mixed, and after molding, drying, and calcination, the catalyst is obtained. The catalyst prepared by this method exhibits excellent CO2 removal performance and does not have a particularly adverse effect on the removal of organic sulfur impurities and the hydrogenation saturation reaction of olefins, enabling the hydrogenation of dry gas with high CO2 content to produce low-carbon hydrocarbons.

The application discloses a kind of carbon four alkylation raw material pretreatment catalyst and preparation method and pretreatment method, belong to carbon four light hydrocarbon processing technical field.Its technical scheme is: carbon four alkylation raw material first enters extraction column and is extracted, water-washed carbon four alkylation raw material is extracted from top and enters catalytic rectification column, catalytic rectification column is divided into rectification section, reaction section and stripping section from top to bottom, catalyst of the application is placed in reaction section;Carbon four alkylation raw material enters reaction section, butadiene therein and hydrogen gas occur reaction, and 2-butene generated in the reaction process is removed constantly;Catalytic rectification column bottom is extracted and pretreated carbon four alkylation raw material.The pretreatment method of the application carries out corresponding desulfurization, denitrogenation, deoxidant and diene hydrocarbon etc.pretreatment before carbon four alkylation raw material enters alkylation device, meets the requirement of alkylation feed to raw material impurity, improves alkylation oil quality, reduces the material loss of alkylation process.

The present application discloses a kind of condensed ring aromatic hydrocarbon hydrogenation catalyst and its preparation method and application.The catalyst includes porous carrier, active metal component and auxiliary component, the active metal component is selected from at least one of La system, group VIB or group VIII metal element, the auxiliary component is selected from at least one of group IIA metal element, the catalyst, with X-ray photoelectron spectroscopy characterization, metal component M a+ (a>1) is reduced to M (a‑1)+ The ratio of M a+ Total reduction of at least 80%, preferably at least 90%.The catalyst of the present application is used for condensed ring aromatic hydrocarbon hydrogenation reaction, especially naphthalene and naphthalene hydrogenation reaction, with the characteristics of improving the conversion rate of reactants, the selectivity of target product.

This invention relates to the field of methanation catalysts, disclosing a methanation catalyst, its preparation method, and its applications. The method includes: reducing a nickel precursor in the presence of water using a reducing agent; then, in the presence of a protective agent, mixing the resulting reduction product with a dispersant and allowing it to stand and separate into layers to form a layered liquid; wherein the protective agent is a hydrophobic inert liquid; the layered liquid comprises an upper layer and a lower layer, the upper layer containing the protective agent, and the lower layer containing water and catalyst particles, the catalyst particles containing amorphous nickel and the dispersant; adjusting the pH of the lower layer to 7-9, and then removing the water from the lower layer, so that the protective agent coats the catalyst particles. The active component in this methanation catalyst is amorphous nickel, which, compared to catalysts with crystalline nickel as the active component, improves the hydrogenation capacity of the active component. Furthermore, this methanation catalyst is itself in a reduced state, requiring no reduction before use, making it more suitable for slurry bed reactors.