69results about How to "Reduce surface acidity" patented technology

The present invention discloses a preparation process of heavy oil hydrogenating, demetallizing and desulfruizing catalyst. Aluminum containing material in two different forms, including roasted alumina and dry aluminum hydroxide glue powder, is used. Of the assistant alkali metal element and/or alkali earth metal element, part is mixed with dry aluminum hydroxide glue powder and part is loaded onto the carrier via soaking process, so as to result in the inhomogeneous distribution of the assistant on the carrier. The catalyst has high demetalizing activity and desulfurizing activity, and highactivity stability, especially high desulfurizing activity stability. The catalyst may be used in the hydrodemetalizing and hydrodesulfurizing treatment of heavy oil and residual oil.

The invention discloses a selective hydrogenation catalyst for producing biodiesel and a preparation method and application of the selective hydrogenation catalyst. The selective hydrogenation catalyst comprises a carrier and a main metal active ingredient loaded on the carrier, the main metal active ingredient accounts for 5-30% of the catalyst in weight and is one of or a combination of oxides containing Co, Mo, Ni and W, and the carrier is composed of, by weight, 1-8% of a molecular sieved, 25-65% of amorphous sial, 30-65% of alumina and 2-10% of a graphene auxiliary. The preparation method includes: disposing the carrier in a metal salt solution containing Co, Mo, Ni or/and W for soaking for 4-20 h to obtain a soaked carrier; freeze-drying and then calcining the soaked carrier to obtain the selective hydrogenation catalyst. With same carrying capacity of the carrier, active surface area represented by the carrier is large, the selective hydrogenation catalyst has more active sites, reaction temperature is lowered, and hydrogenation performance is improved.

The invention relates to a method for hydrorefining petroleum wax. According to the invention, alumina is used as a carrier of a hydrorefining catalyst, and an active component in the catalyst is one or two selected from the group consisting of NiO, MoO3 and WO3, wherein, the content of NiO accounts for 2 to 7% of the total weight of the catalyst, and the content of MoO3 and/or WO3 accounts for 20 to 32% of the total weight of the catalyst; the content of SiO2 accounts for 1 to 9% of the total weight of the catalyst, and the content of P2O5 accounts for 1 to 7% of the total weight of the catalyst; the catalyst has a specific surface area of 120 m<2>/g to 190 m<2>/g, a pore volume of 0.30 ml/g to 0.55 ml/g, pores with a pore diameter of 5 nm to 14 nm account for 40 to 70% of the whole pore volume, and pores with a pore diameter of 20 nm to 40 nm account for 20 to 40% of the whole pore volume; the alumina carrier has a double-peak pore structure, the pore wall of a macroporous tunnel has weak surface acidity, and pore wall of a microporous tunnel has strong surface acidity.

The invention relates to a preparation method of an alkene epoxidation catalyst. The preparation method of the alkene epoxidation catalyst comprises the following steps: (1) preparing titanium silicongel; (2) performing pore-enlarging treatment on the titanium silicon gel by using organic amine or liquid ammonia, drying and roasting to obtain titanium silicon composite oxide; (3) optionally performing alcohol solution treatment on organic alkali metal salt; and (4) optionally performing gas phase silanization treatment. The pore diameter of the catalyst prepared by the method is adjustable, so that the catalyst has higher activity on epoxidation reaction of olefin molecules with different kinetic diameter; and the catalyst is subjected to two-step modification, the surface acidity of thecatalyst is effectively reduced and the catalyst has higher epoxidation product selectivity.

The invention relates to a catalyst used for producing olefin through low-carbon alkane dehydrogenation, and a preparation method thereof. The invention mainly aims at solving the problems of low activity and poor stability of dehydrogenation catalysts prepared with prior arts. The low-carbon alkane dehydrogenation catalyst provided by the invention is prepared through an impregnation precipitation method, and comprises the following components, by weight: (a) 0.1-5 parts of Pt or oxide thereof, (b) 0.1-5 parts of Sn or oxide thereof, (c) 0.1-5 parts of alkali metal or oxide thereof, (d) 0.1-5 parts of Fe, Co, Ni, Cu, Zn or oxide thereof, (e) 0.1-10 parts of a Ce-La-O solid solution, and (f) 80-99 parts of a carrier Al2O3. With the above technical scheme, the problems are well solved. The catalyst can be applied in industrial productions for producing low-carbon olefin through low-carbon alkane dehydrogenation.

The invention relates to a preparation method of a catalyst for the selective hydrogenation of alkyne and alkadiene. A carrier of the catalyst is a compound of 30-99% of aluminum oxide, 1-50% of titanium oxide, 1-30% of magnetism oxide and 1-40% of zinc oxide based on the weight of the carrier of the catalyst as 100%; meanwhile, an alcohol reagent and an alkali metal or an alkaline-earth metal are used as modifying reagents; the preparation method is an acidity sol mixed kneading molding method; the active components of the catalyst comprise three or more of palladium, gold, silver, bismuth, cerium, lanthanum, tin and antimony, and a loaded solution of the active components is subjected to polymerization; the carrier of the catalyst prepared by the method has relatively low acid content; and the prepared catalyst shows up relatively appropriate reaction activity in the selective hydrogenation reaction of the alkyne and the alkadiene and has relatively good hydrogenation selectivity, relatively strong green oil generation resistance and relatively low palladium wastage rate.

An iso-butane dehydrogenation catalyst and a preparation method thereof relate to catalytic agents and preparation methods of the catalytic agents in chemical reactions. The catalyst comprises, by weight, 1-30% of vanadic oxide, 0.2-5% of alkali metal oxide, 0.1-10% of Ce containing rare earth elements or La oxide and 55-98.7% of nanometer Al2O3. The preparation method is first preparing an Al2O3 carrier, then mixing the carrier with vandic salt solution, alkali metal solution, the Ce containing the rare earth elements or La salt solution, and then stewing and filtering to obtain a catalyst sample, roasting the catalyst sample for a certain time at certain temperature, and finally preparing the iso-butane dehydrogenation catalyst. The prepared iso-butane dehydrogenation catalyst improves conversion rate of iso-butane and achieves high olefin selectivity on the bases of the vanadic system catalyst at present.

The invention discloses a selective hydrogenation catalyst for producing biological aviation kerosene and a preparation method and an application thereof. The catalyst comprises a carrier and a main metal active component; the main metal active component is loaded on the carrier; the main active metal component accounts for 0.05-1.15 wt% of the catalyst finished product and is Pt or/and Pd; the carrier comprises the raw materials by the weight percentage: 2-10% of molecular sieve, 25-65% of amorphous silicon aluminum, 30-65% of alumina and 2-10% of a graphene auxiliary agent. The method comprises the steps: placing the carrier in a solution containing Pt and/or Pd metal salts, and immersing for 4-20 h, to obtain a carrier after impregnation; and drying the carrier obtained after impregnation, and then treating the dried carrier in a reducing atmosphere, to obtain the selective hydrogenation catalyst. Under the same loading capacity, the selective hydrogenation catalyst has larger representative active surface area and more active sites, reduces the reaction temperature, and improves the hydrogenation performance.

The invention relates to a process for preparing octaene by butene oligomerizatio through using butene as raw material, using M-ZSM-5 molecular sieve as the catalyst for the reactive main body, and employing a reaction temperature of 250-350 deg. C, reaction pressure 4.0-5.0 MPa, liquid phase volume hourly space velocity of 0.5-3h-1, the prepared octaene can be used in the industrial production of octaene through butylenes oligomerization reaction.

The invention relates to a catalyst carrier prepared from mixed aluminum oxide and mesoporous molecular sieve and a preparation method thereof. The mixed mesoporous carrier is prepared by the following steps of: adding the mesoporous molecular sieve and various auxiliary agent into a conventional aluminum oxide source; performing mixing and extrusion moulding; and then performing hydrothermal treatment, drying and roasting to finally obtain a finished product dehydrogenation catalyst carrier. The prepared light alkane dehydrogenation catalyst carrier has high mechanical strength, good thermal stability and enhanced catalysis activity.

The invention provides a catalyst for gas phase hydrogenation of furfural to prepare furfuryl alcohol, preparation and application thereof. The catalyst is composed of a metal component and a siliconoxide carrier pretreated by alcohol amine. The preparation method of the catalyst includes the steps of: (a) adding a certain amount of alcohol amine liquid into a silicon oxide porous carrier; (b) conducting drying and roasting treatment successively on the mixture obtained in step (a) to obtain a pretreated carrier; (c) adding a certain amount of a copper precursor solution into the carrier obtained in step (b); and (d) conducting drying and roasting on the mixture obtained in step (c) in order to obtain the catalyst. The invention has the advantages that: the catalyst has simple composition, and does not contain toxic and carcinogenic Cr, the preparation method of the catalyst is simple and convenient, low in cost, and easy for large-scale application, and the catalyst has high furfuralhydrogenation low temperature activity and long catalyst lifetime.

The invention discloses a catalyst for preparing 1,6-hexanediol from dimethyl adipate.The catalyst is composed of a Cu-Zn-Al-Zr oxide, and comprises 25-60% of Cu, 25-50% of Zn, 10-30% of Al and 0.15-1.2% of Zr.The invention further discloses a preparation method of the catalyst.The catalyst is good in activity and heat resistance.Compared with the prior art, the reduction temperature of the catalyst is low and is 200-220 DEG C, the catalyst can be directly reduced in a reactor, and the cost is reduced; when the catalyst is in use, reaction pressure is reduced to 5-8 MPa, the air speed is decreased, and finally the production cost of hexanediol can be reduced; the preparation method is simple, no additional special equipment is needed, and the application prospect is good.

The invention discloses a propane dehydrogenation catalyst and a preparation method thereof. The propane dehydrogenation catalyst adopts CaO-Al2O3 composite oxide balls as a carrier, adopts metal Pt as an active component, and adopts Sn and Bi as additives; by adoption of the mass of the catalyst as a reference, the content of the metal Pt is 0.1-1.0wt%, the content of the Sn is 0.1-2.0wt%, the content of the Bi is 0.1-1.0wt%, the content of CaO is 1.0-5.0wt% and the rest is Al2O3. The propane dehydrogenation catalyst and the preparation method disclosed by the invention have the beneficial effects that the catalyst is prepared by adopting a coprecipitation process and can ensure heat stability and enough specific surface area and pore volume of catalyst carriers; the reaction property andanti-carbon-deposition capability of the catalyst are excellent; the dehydrogenation activity of the catalyst is very high under a high-temperature condition, the propylene selectivity can reach 90%or more, and the stability is good.

The invention provides a high-precision desulfurization and denitrification catalyst carrier which comprises the following components by weight part: 10-20 parts of magnesium oxide, 0.1-10 parts of zirconium oxide, 0.1-10 parts of MCM-22 molecular sieves and 70-90 parts of a mixture of silicon oxide and aluminum oxide. The desulfurization and denitrification efficiency of a catalyst prepared with the catalyst carrier can be obviously increased by taking silicon and aluminum as a carrier and adding magnesium oxide, zirconium oxide and MCM-22 molecular sieves into the carrier; the catalyst carrier has high mechanical strength and high compression-resisting abrasive resistance; the problem of low desulfurization and denitrification efficiency of a catalyst prepared with a catalyst carrier in the prior art is solved.

The invention relates to a hydrogen selective oxidation catalyst used in the propane dehydrogenation process and a preparation method thereof, and mainly solves the problems of low oxygen conversion rate and high hydrocarbon loss of the hydrogen oxidation catalyst in the prior art. By adopting a technical scheme that the hydrogen selective oxidation catalyst comprises the following components in percentage by weight: 0.1 to 10 percent of Pt or oxide thereof, 0.25 to 10 percent of Sn or oxide thereof, 0.1 to 10 percent of Li or oxide thereof, and 80 to 99 percent of nano alumina, and a preparation method for the catalyst is provided, the problems are better solved; and the catalyst can be used for propane dehydrogenation-hydrogen selective oxidation industrial production.

The invention relates to a catalyst for preparing low-carbon olefin through Fischer-Tropsch synthesis and a preparation method of the catalyst, and mainly aims to solve the problems of low CO conversion rate and low-carbon olefin selectivity in reaction for preparing the low-carbon olefin through Fischer-Tropsch synthesis in the prior art. The invention adopts the following technical schemes: a composite oxide consisting of titanium oxide and alpha-aluminum oxide is adopted as a carrier, and an active component is loaded on the composite oxide carrier and contains a composition with the following chemical formula in an atomic ratio: Fe100AaBbCcOx, wherein A is selected from a transition metal of Mn, B is selected from at least one of alkali metals of Mg and Ca, and C is selected from at least one of K and Cs; the dosage of the composite oxide carrier is 20-80% of the weight of the catalyst; alpha-aluminum oxide contained in the composite oxide carrier accounts for 50-99% of the weight of the composite oxide carrier by weight. The catalyst disclosed by the invention well solves the problems, and can be applied to industrial production of low-carbon olefin prepared through Fischer-Tropsch synthesis.

The invention provides a preparation method of an ethanol Pt-Sn/Li-Al-O catalyst through acetic acid hydrogenation and belongs to the technical field of catalyst preparation. The method comprises the steps of (1) immersing Al2O3 into a soluble metal salt solution containing lithium, drying and roasting to obtain a Li-Al-O carrier; and (2) immersing the obtained Li-Al-O carrier into a soluble metal salt solution containing active components Sn and Pt and then drying and roasting to obtain a Pt-Sn/Li-AlO catalyst. The Li-Al-O of a lithium aluminum spinel structure is adopted as the carrier, the surface property of the carrier is stable and the dispersibility of the active components can be improved, thereby improving the activity and the stability of a finished product catalyst. The prepared catalyst has relatively low surface acid property and the selectivity of ethanol can be effectively improved. The method is applied to preparation of the ethanol through acetic acid hydrogenation, so that the acetic acid conversion rate can reach 100% and the ethanol selectivity can reach over 95%. The catalyst prepared through the preparation method has good stability, and the catalyst activity and the ethanol selectivity are basically kept invariable after reaction for 500h.