52results about How to "Increase the degree of vulcanization" patented technology

The invention relates to a presulfided sulfur-tolerant shift catalyst and a preparation method, belonging to the technical field of presulfurization treatment of sulfur-tolerant shift catalysts. The presulfided sulfur-tolerant shift catalyst prepared by using the method in the invention comprises an active component which is a binary component of a cobalt-contained compound and a molybdenum-contained compound, and carrier raw materials which are a magnesium-contained powdery compound, an aluminum-contained powdery compound, a titanium-contained powdery compound, and an external surface wrappage material composed of a macromolecular compound. The preparation method for the presulfided sulfur-tolerant shift catalyst provided by the invention comprises the following steps: preparation of an active component solution, molding of the catalyst, drying, roasting, presulfurization treatment, and aftertreatment of the catalyst. The presulfided sulfur-tolerant shift catalyst prepared by using the method in the invention is easy to activate when in use, has short activation time and high shift activity, and is convenient for transportation and storage; and the preparation method for the presulfided sulfur-tolerant shift catalyst provided by the invention is simple in process and facilitates realization of industrialization.

The present invention discloses a preparation method for a vulcanization type hydrogenation catalyst. The preparation method comprises: uniformly mixing a carrier precursor, a thiomolybdate and / or thiotungstate, a nickel salt and / or a cobalt salt, adding a binder to carry out kneading, carrying out molding, and then carrying out drying and calcination in the protection of an inert gas to prepare the catalyst. The method of the present invention has characteristics of simple process and high vulcanization degree, wherein the prepared vulcanization type hydrogenation catalyst has high activity and high selectivity.

The invention relates to the field of hydrorefining, and discloses a vulcanization type hydrogenation catalyst, a preparation method and applications thereof. The method comprises: (1) mixing a dispersing agent and a solution A containing a group VIB metal salt, a group VIII metal salt and a sulfur source, wherein the solution A is acidic, the dispersing agent is a water-soluble organic solvent with a boiling point of 15-90 DEG C, and the sulfur source is a sulfur-containing material capable of being hydrolyzed at 50-100 DEG C under an acidic condition; (2) making the mixture obtained in the step (1) contact a catalyst carrier for 5-30 h at a temperature of 60-150 DEG C under a sealed condition; and (3) calcining the solid material obtained in the step (2) in an inert or reducing atmosphere. With the method of the present invention, the main agent component and the auxiliary agent component are introduced in one step, and the active component of the prepared catalyst is highly dispersed and fully vulcanized so as to significantly improve the hydrogenation performance of the catalyst.

The invention discloses a preparation method of a sulfur-loaded hydrogenation catalyst. The method comprises the following steps: firstly pulping a hydrated alumina precursor, adding a nickel nitrate or cobalt nitrate solution, then slowly adding a carbonate precipitating agent solution drop by drop to form composite nickel carbonate or composite cobalt carbonate precipitates, aging, filtering, washing to obtain a wet filter cake, pulping in a closed container, orderly adding an ammonium heptamolybdate aqueous solution and an ammonium sulphide aqueous solution, slowly adding dilute nitric acid drop by drop into the solution to generate a molybdenum sulfide MoS3 paste precipitate, filtering the precipitate, drying, molding, and drying to obtain the sulfur-loaded catalyst. The sulfur-loaded catalyst prepared by the method of the invention is high in sulfidity, and the production process is simple, and easy to carry out technically; the catalyst has high hydrorefining performance. The method of the invention simplifies the preparation process of the catalyst, saves resources, and increases benefits.

The invention discloses a pre-sulfurization method of a hydrogenation catalyst, comprising the specific steps of mixing the hydrogenation catalyst with one or more sulfur-bearing compounds, adding the mixture into a reactor, introducing hydrogenation active gas into the reactor, maintaining the inner pressure of the reactor to 1.5-4 MPa, sealing the reactor, and pre-sulfurizing at 220-380 DEG C for 1-6 hours. The pre-sulfurization process is performed in the sealed reactor, the sulfur-bearing compounds may be released massively and instantly during heating, the formed H2S gas has high pressure and concentration, sulfurization can be finished within a short time, and sulfurization degree is high; in addition, by controlling the usage of the catalyst and sulfur-bearing compounds in the reactor, it is possible to achieve controllable pre-sulfurization degree; all the sulfur-bearing materials are nearly consumed, and no pollutant is produced.

The invention provides an aluminum oxide based hydrorefining catalyst as well as a preparation method and application thereof. The method comprises the following steps: 1, immersing active metal components into an aluminum oxide carrier, and drying and roasting to obtain an active metal component loaded catalyst; and 2, introducing an organic complexing agent into the active metal component loaded catalyst and drying to obtain the aluminum oxide based hydrorefining catalyst, wherein the aluminum oxide carrier comprises delta-Al2O3 or theta-Al2O3. The aluminum oxide based hydrorefining catalyst provided by the invention can be used for FCC diesel oil so that the yield of the FCC diesel oil is higher than 99%, the content of sulfur is lower than 10ppm, and China 5 standard requirements are met.

The invention discloses a preparation method of a hydro-treatment catalyst. The preparation method comprises the following steps: preparing an alumina carrier, preparing an impregnation solution containing the VIII group metal and VIB group metal, wherein the impregnation solution comprises a proper amount of an organic auxiliary agent containing chelating ligand, then impregnating the alumina carrier into the impregnation solution under a proper ultrasonic treatment condition, and drying so as to obtain the hydro-treatment catalyst. The preparation method utilizes the ultrasonic cavitation effect to properly reduce the viscosity of the impregnation solution; at the same time the complexing capacity between the chelating ligand in the organic auxiliary agent and nickel / cobalt is improved by the catalytic function of the ultrasonic, the interaction force between the chelating ligand and nickel / cobalt is strengthened, thus the active metal component is promoted to highly disperse on the carrier surface, furthermore, the existing state of the active metal on the catalyst surface is improved at the same time, the sulfurization degree and sulfurization uniformity of the active metal are both improved, so the activity and stability of the catalyst are both improved. The catalyst is especially suitable for being used in the hydro-denitrogenation process and hydro-desulfurization process of heavy distillate oil.

The invention relates to a hydrogenation desulfurization and dearomatization catalyst, a preparation method thereof, a hydrogenation desulfurization and dearomatization catalyst system, and a diesel hydrogenation desulfurization and dearomatization method. The hydrogenation desulfurization and dearomatization catalyst comprises a carrier and sulfide-state metal active components and trace elements loaded on the carrier. The trace elements are one or more selected from P, F, Si, B and Mg. The metal active components comprise Group VIII and Group VIB metal elements. The catalyst is characterized in that, tested with XPS, the vulcanization degree of the Group VIII metal elements in the catalyst is no lower than 70%, and the vulcanization degree of the Group VIB metal elements in the catalyst is no lower than 70%; and counted with TEM, an active phase ratio of a three-layer stack of the catalyst is no lower than 30%. With the hydrogenation desulfurization and dearomatization catalyst provided by the invention, both the desulfurization effect and the dearomatization effect are taken into account.