72results about How to "Reduce strong interactions" patented technology

The invention discloses a low carbon alkane dehydrogenation catalyst for alkene production and its preparation method and application. The catalyst uses Al2O3 (alumina) as a carrier, chromium as an active component, and an alkali metal as an assistant catalyst component, taking to the final catalyst weight as the base, the chromium oxide content is 10.0%-30.0%, the alkali metal oxide content is 0.5%-3.0%, and the rest is the alumina. The active component chromium is stepwise impregnated onto the alumina carrier before and after impregnation of the alkali metal assistant catalyst component. The low carbon alkane dehydrogenation catalyst for alkene production is used in dehydrogenation of propane to produce propylene. The low carbon alkane dehydrogenation catalyst for alkene production has high activity stability and propylene selectivity, and the preparation method is simple, and is suitable for industrial applications.

The invention discloses a dehydrogenation catalyst and a preparation method and application thereof. The dehydrogenation catalyst uses ammonia processed alumina as a carrier, chrome as an active component, and one or a plurality of potassium, manganese, cobalt, iron, nickel, copper and zinc as an additive, the additive is loaded onto the carrier by a co-impregnation method, and taking oxide weight content in the final catalyst as a reference, the catalyst comprises 2%-6% of chromium oxide, and 0.1-5% of the additive. The preparation method of the hydrocarbon dehydrogenation catalyst comprises the following processes: using ammonia to preprocess an alumina carrier, using the co-impregnation method to load one or a plurality of potassium, manganese, cobalt, iron, nickel, copper and zinc, and loading the active component chrome. The dehydrogenation catalyst can be used in dehydrogenation of propane for preparation of propylene. The low carbon alkane dehydrogenation catalyst prepared by the preparation method has the advantages of low active component chromium oxide content, good propylene selectivity, high activity and the like.

The invention discloses a polyimide film and a preparation method and applications thereof. The compound forming the polyimide film is the compound of which structural general formula is shown in the formula I. The preparation method of polyimide is as follows: aromatic dianhydride 2,3,3',4'-diphenyl ether tetracarboxylic acid dianhydride (aODPA) and a series of aromatic diamine monomers are used as raw materials to prepare polyimide resin through chemical imidization. The polyimide film prepared by the technology has good optical transparency, low solar absorptivity-emissivity ratio and good thermal stability, and can be used to prepare the thermal protection device of the spacecraft, the solar cell array substrate and the antenna reflector/collector or solar sail and have important application value.

The present invention relates to preparation process of hydrocarbon hydroprocessing catalyst, which has gamma-Al2O3 as carrier, VIB and VIII metal as the active component, and Ti, etc as the active assistant, with the assistant Ti being introduced in the pH swinging carbonization process for producing aluminum hydroxide. The process of preparing the catalyst is one complete mixing and kneading process including the steps of introducing Ti to aluminum hydroxide powder via adding Ti salt solution, adding Mo and/or W containing alkaline solution, mixing and kneading until the aluminum hydroxide powder is wetted completely by the alkaline solution, adding Co and/or Ni containing acid solution, mixing and kneading to obtain plastic material, extruding, drying, and roasting to obtain the catalyst. The catalyst has homogeneously distributed Ti component and obviously raised performance.

The invention provides a method for preparing sulfuration-type gasoline selective hydro-desulfurization catalyst. A main content of the method is characterized in that hydrogenation active metal elements of the gasoline selective hydro-desulfurization catalyst are combination of Co and Mo, the hydrogenation active metal element Co is introduced and is calcinated, the hydrogenation active metal element Mo is introduced by employing an impregnation method and then is dried, the dried catalyst is directly and rapidly procured in short time without calcination, preferably, surface sulfur polymer reduction operation can be carried out. The catalyst has obvious usage performance by the method, and the method has the advantages of simple precuring step, short on-stream time of the catalyst, low heat energy consumption, less amount of a toxic vulcanizing agent which has easy corrosion performance, and low production cost.

The invention relates to a preparation method for a catalyst to hydrotreat hydrocarbons, which comprises gama- Al2O3 as carrier, metal from VIB group and VIII group as active constituents, and Ti as active adjuvant. The prepraration method comprises: adding titanate solution to bring said Ti during the gelatinization for preparing aluminum hydroxide; adding basic solution contained Mo or W into the dried aluminum hydroxide powder, mixing till the powder wet fully by solution; adding acid solution contained Co or Ni, mixing till plastic, extruding to form, drying, baking, and obtaining the catalyst. This invention improves the catalyst property obviously.

The invention discloses a preparation method of an eggshell hydrogenation catalyst. The method consists of: mixing an alumina precursor with a gemini surfactant and an adhesive uniformly, conducting mixing and kneading to obtain a catalyst carrier, then dipping the carrier in a dipping solution containing a thickening agent under the condition of introducing air to undergo bubbling, and then performing drying and roasting, thus obtaining the eggshell hydrogenation catalyst. The method provided in the invention can effectively regulate the surface active metal shell thickness and active metal dispersity of the eggshell hydrogenation catalyst, also can stabilize the active metal components on the hydrogenation catalyst, reduce loss of the active metal components, as well as reduce the catalyst production cost.

The invention provides an ultra-deep desulfurization catalyst, a preparation method thereof and an application of the catalyst. The preparation method of the desulfurization catalyst includes the steps: weighing ammonium paramolybdate and nickel acetate tetrahydrate, dissolving the ammonium paramolybdate and the nickel acetate tetrahydrate in glacial acetic acid and water mixed solution in a stirring manner; adding hydrazine sulfate and dissolving the hydrazine sulfate in a stirring manner; performing stirring reaction in a thermostatic water bath to obtain polyoxometallate after reaction; dispersing the polyoxometallate in water and performing ultrasonic treatment; adding aluminum oxide, uniformly stirring the materials and performing hydro-thermal decentralization loading in an autoclaveto obtain the desulfurization catalyst after reaction. The prepared desulfurization catalyst is good in dispersing performance and high in activity, ultra-deep desulfurization can be achieved, and desulfurization rate reaches up to 93.8%.

The invention discloses a method for recycling hydrogenation catalyst waste. The method comprises the following steps: (1) alumina support waste and/or the hydrogenation catalyst waste are/is smashedand sieved, powder obtained after sieving is pulped, slurry with solid content being 15wt%-55wt% is obtained, a nitric acid-phosphoric acid-organic acid mixed solution is added with stirring, the obtained solution is heated to 65-100 DEG C, kept at the temperature for 30-90 min and cooled to room temperature, then organic amine is added, the solution is mixed uniformly, and sol slurry of the wasteis obtained; (2) the sol slurry of the waste in step (1), alumina powder and an extrusion aid are mixed uniformly, then mixed kneading, forming, drying and roasting are performed, and an alumina support is obtained; (3) an active component is supported on the alumina support, and a hydrogenation catalyst is obtained. With adoption of the method, the hydrogenation catalyst waste can be recycled effectively, wastewater and waste residues are not produced, pollution to the environment is avoided, and the catalyst prepared with the method has higher catalytic activity.

The invention provides a deep desulfurization catalyst and a preparation method and application thereof. The preparation method of the deep desulfurization catalyst includes: weighing ammonium paramolybdate and cobalt acetate tetrahydrate, dissolving into glacial acetic acid and water mixed solution, stirring to dissolve, adding hydrazine sulfate, stirring to dissolve, performing stirring reactionin a constant-temperature water bath to obtain a cobalt-molybdenum heteropoly compound after reaction is finished; dispersing the cobalt-molybdenum heteropoly compound into water, ultrasonically treating, adding aluminum oxide, well stirring, and performing hydrothermal load dispersion in an autoclave to obtain the desulfurization catalyst after reaction is finished. The desulfurization catalystis high in dispersion performance and activity, deep desulfurization can be realized, and the desulfurization rate is up to 94.1%.

The invention relates to the preparing method of an alkanes hydrogenating catalyst. The carrier of the catalyst is gamma-Al2O3 and the active ingredient is VIB group and VIII group metals. The invention adopts the complete mix-and-pinch method to prepare the catalyst. It uses the method of alkalinizing- evaporating-sedimentating of aluminum hydroxid solution to prepare the dry aluminium hydroxide gel. During the sedimentating process, the material is treated by ultrasonic of certain energy. The prepared aluminium hydroxide has larger bore volume, larger specific surface area and more concentrated bore distribution; besides, it has omitted the aging, filtering and washing procedures in the regular method, so it has shortened the preparing cycle and it does no harm to the environment at all. Ammonium oxalate serves as reaming agent in the invention and it can enlarge the bore very well. The catalyst can be used in the hydrogenating process of different kinds of distillate, especially the hydrogenation process of the heavy magnesium carbonate distillate.

The invention discloses a heavy oil hydrogenation catalyst with high desulfurization activity and a preparation method thereof, and the preparation method comprises the following steps: adding an alumina carrier into an organic acid solution for soaking treatment, further performing extraction treatment, then performing low-temperature heat treatment to obtain a carrier, then loading active metal, and finally drying and roasting to obtain the catalyst. The preparation method of the catalyst provided by the invention can effectively weaken the interaction between the active metal and the alumina carrier, improves the uniform dispersion of the active metal on the carrier to a certain extent, and the obtained catalyst is easier to sulfurize, thereby greatly improving the hydrodesulfurization activity of the catalyst.

The invention discloses a synthetic gas conversion catalyst. According to the synthetic gas conversion catalyst, modified silica gel is taken as a carrier; cobalt is taken as an active component, and accounts for 5 to 35wt% of the synthetic gas conversion catalyst; and the modified silica gel is modified with a zinc-containing aqueous solution with a pH value of 3 to 4.5 via excessive immersion treatment. The invention also discloses a preparation method of the synthetic gas conversion catalyst. The preparation method comprises following steps: silica gel is taken as the carrier, and is subjected to surface modification, wherein excessive immersion treatment with the zinc-containing aqueous solution with a pH value of 3 to 4.5 is used for surface modification of the silica gel carrier; and loading of the active component Co is carried out via immersion method. The invention also discloses applications of the synthetic gas conversion catalyst in Fischer-Tropsch synthetic reaction. The preparation method is simple; and the synthetic gas conversion catalyst is high in activity and stability.

The invention relates to a method for preparing hydrocarbon hydrogenation catalyst. Wherein, said catalyst uses gamma-Al2O3 as carrier, uses VIB group and VIII group metal as active components; uses Ti as active agent. The invention adds organic Ti salt into the agglutination process that prepares aluminum hydroxide with carbonization method. And the catalyst preparation uses complete mixing method that adding alkali solution with Mo and/or W into the aluminum hydroxide dry powder, mixing until the aluminum hydroxide powder is wetted by alkali solution; adding the acid solution of Co and/or Ni; mixing and shaping into bars, drying, baking to obtain the catalyst. In said catalyst, the catalyst agent Ti has uniform distribution, and the property of catalyst is improved.