31results about How to "High isomer selectivity" patented technology

The invention relates to a preparation method of a catalyst used for preparing a liquid fuel by oil and fat hydrogenation. The preparation method comprises the following specific preparation steps: firstly, mixing a calcined SAPO-11 molecular sieve and an amorphous oxide precursor, performing strip extrusion, performing molding, and performing calcination to prepare a carrier precursor; filling pore channels of the carrier precursor with monomer molecules of a polymer, and performing heating treatment to obtain a carrier with partially-covered molecular sieve acidic sites and partially-blockedmolecular sieve pore channels; and supporting a metal active component on the carrier, performing drying, and performing reduction to obtain the target catalyst. Compared with a catalyst prepared inthe prior art, the catalyst prepared by adopting the method provided by the invention has the higher isoparaffin selectivity and yield in the process of preparing the liquid fuel by oil and fat hydrogenation.

The invention discloses a preparation method of a loading type bimetallic catalyst with a highly-dispersing active center and belongs to the technical field of active center structure control of the loading type catalyst. In the catalyst, the active center is loaded on aluminium oxide modified in situ by hydrotalcite, and a trivalent additive metal is introduced into a hydrotalcite layer plate by utilizing the adjustable characteristic of metal cations of the hydrotalcite layer plate. When the hydrotalcite layer plate is topologically transformed into the layered bimetallic oxide in the process of roasting reduction, due to the confinement action of lattices of the hydrotalcite layer plate, the additive metal embedded into the hydrotalcite layer plate is controlled to grow in the process of roasting reduction. The control for the dispersing state of the active center of the metal is realized by the lattice induction action of the platinum at the active center of the metal on the layer plate by the hydrotalcite layer plate.

The invention discloses a preparation method for a hydrodewaxing catalyst and a catalyst prepared by using the same, and an application of the catalyst. The method comprises the following steps: a, subjecting a molecular sieve-inorganic oxide carrier to first impregnation with an ammonium salt solution, and carrying out drying so as to obtain an impregnated carrier, wherein the ratio of ammonium salt to the molecular sieve-inorganic oxide carrier is 0.01 to 0.2 mol/100 grams; b, mixing hydrogenation active metal salt with water so as to obtain a solution containing the hydrogenation active metal salt, and adjusting the pH value of the solution containing the hydrogenation active metal salt to 10.0 to 12.0 by adopting at least one selected from the group consisting of ammonia water, ammonium carbonate and urea so as to obtain an impregnating solution; and c, subjecting the impregnated carrier obtained in the step a to second impregnation with the impregnating solution obtained in the step b so as to obtain the hydrodewaxing catalyst. The catalyst prepared by using the method provided by the invention is applied in the process of hydrodewaxing, so the selectivity of the catalyst is improved; meanwhile, the pour point of heavy lubricant base oil can be effectively reduced; and a high target product yield is maintained.

The invention relates to a preparation method of a catalyst used for preparing a liquid fuel by oil and fat hydrogenation. The method comprises the following specific preparation steps: firstly, mixing a calcined ZSM-22 molecular sieve and an amorphous oxide precursor, performing strip extrusion, performing molding, and performing calcination to prepare a carrier precursor; filling pore channels of the carrier precursor with monomer molecules of a polymer, and performing heating treatment to obtain a carrier with partially-covered molecular sieve acidic sites and partially-blocked molecular sieve pore channels; and supporting a metal active component on the carrier, performing drying, and performing reduction to obtain the target catalyst. Compared with a catalyst prepared in the prior art, the catalyst prepared by adopting the method provided by the invention has the higher isoparaffin selectivity and yield in the process of preparing the liquid fuel by oil and fat hydrogenation.

The invention discloses a method for preparing 3,5,5-trimethyl-3-cyclohexene-1-one. The method comprises the following steps: taking 3,5,5-trimethyl-2-cyclohexene-1-one (alpha-IP) as a raw material, taking preazophosphorine as a catalyst, and carrying out an isomerization reaction by adopting a reactive distillation technique, thereby obtaining the 3,5,5-trimethyl-3-cyclohexene-1-one (beta-IP). The purity of the product beta-IP can reach 99.5-99.8wt%, and the reaction selectivity can reach 99.2-99.9%. The process has the advantages of small catalyst usage amount, high selectivity, avoidance of alkaline separation, less high-boiling residues and the like and a high-efficiency synthetic process.

The invention relates to the field of molecular sieves, and discloses a preparation method of a molecular sieve with rich aluminum on the surface. The method comprises the following steps: preparing two molecular sieve precursor gels with different silicon-aluminum ratios, respectively carrying out first-step crystallization on the two molecular sieve precursor gels by controlling crystallizationconditions, mixing the first-step crystallization products according to a preset ratio, and carrying out second-step crystallization to finally obtain the molecular sieve with rich aluminum on the surface. According to the invention, the obtained molecular sieve is high in crystallinity, the effective acid centers are intensively distributed on the outer surface, and the molecular sieve shows highcatalytic activity and high catalytic selectivity in a long-chain alkane isomerization catalytic reaction.

The invention relates to a method for controlling high dispersion of active centers of a supported metal catalyst. The method belongs to the technical field of structural control of the active centers of the supported metal catalyst. The catalyst is formed by loading the active centers on hydrotalcite in-situ modified aluminium oxide and realizes control of a dispersion state of the metal active centers by using a lattice-inducing effect of hydrotalcite laminate on the metal active centers of platinum on the laminate. The method can increase a dispersion degree of the active centers and realizes a better catalytic effect.

The invention discloses a preparation method of hydrodewaxing catalysts as well as a catalyst prepared by the method and an application of the catalyst. The method comprises the following steps: a, first dipping is carried out for a molecular sieve-inorganic oxide carrier with a solution containing metal salt with hydrogenation activity, and drying, calcination and reduction are carried out in order, in order to obtain a supported catalyst; wherein the molecular sieve is a molecular sieve with a one-dimension elliptical hole structure, a minor axis of the one-dimension elliptical hole structure is as follows, a macro axis of the one-dimension elliptical hole structure is as follows; b, second dipping of the supported catalyst obtained in the step a with an aqueous solution of a nitrogen containing compound and drying are carried out, in order to obtain the hydrodewaxing catalyst. The catalyst is applied to the process of hydrodewaxing, selectivity of the catalyst is improved, pour point of heavy lubricating oil base oil is effectively reduced, and higher yield of the target product is maintained.

The invention discloses a preparation method for a hydrodewaxing catalyst and a catalyst prepared by using the same, and an application of the catalyst. The method comprises the following steps: a, subjecting a molecular sieve-inorganic oxide carrier to first impregnation with a solution containing hydrogenation active metal salt, and successively carrying out drying, calcination and reduction so as to obtain a supported catalyst, wherein the molecular sieve is a molecular sieve with a one-dimensional elliptical pore structure, and the minor axis of the one-dimensional elliptic pore structure is 4.2-5.4 angstroms and the major axis of the one-dimensional elliptic pore structure is 5.4-7.0 angstroms; and b, subjecting the supported catalyst obtained in the step a to second impregnation with water, and carrying out drying so as to obtain the hydrodewaxing catalyst, wherein after the hydrodewaxing catalyst is subjected to calcination at 450 DEG C for 4 hours, the weight loss of the hydrodewaxing catalyst is 0.2 to 5.0 wt%. The catalyst prepared by using the method provided by the invention is applied in the process of hydrodewaxing, so the selectivity of the catalyst is improved; meanwhile, the pour point of heavy lubricant base oil can be effectively reduced; and a high target product yield is maintained.

The invention discloses a hydroisomerization catalyst having nano ZSM-22 zeolite loaded with phosphorus and nickel as well as a preparation method and application of hydroisomerization catalyst. The preparation method comprises the steps: firstly, preparing nano ZSM-22 zeolite containing a mesoporous structure; then, carrying out acid treatment on the nano ZSM-22 zeolite carrier through dilute nitric acid or Mg, wherein ZSM-22-De obtained through treatment only has a certain amount of weak acid center and does not have a strong acid center; then impregnating the ZSM-22-De carrier in inorganicsalt containing phosphorus and nickel, enabling the loading capacity of Ni metal in the catalyst to be 0.5-3.0 wt%, the loading capacity of Ni to preferably be 1.0 wt%, and thus obtaining the hydroisomerization catalyst. The catalyst has high activity and high isomerization selectivity, and when the prepared catalyst is applied to the hydroisomerization reaction of long-chain n-dodecane, the catalyst has high monosubstituted isomer yield.

The invention provides a preparation method of a hydrogenation de-waxing catalyst, a catalyst prepared using the preparation method, and applications of the catalyst. The preparation method comprisesfollowing steps: a, a molecular sieve-inorganic oxide carrier is subjected to first dipping using a solution containing a hydrogenated active metal salt, and then is subjected to drying, roasting, andreduction successively so as to obtain a supported catalyst, wherein the molecular sieve is a molecular sieve with a one-dimensional elliptical hole structure, the short axis of the one-dimensional elliptical hole structure is (4.2-5.4) angstroms, and the long axis of the one-dimensional elliptical hole structure is (5.4-7.0) angstroms; and b, the supported catalyst is subjected to second dippingusing an aqueous solution containing an organic compound, and then is dried so as to obtain the hydrogenation de-waxing catalyst. When the hydrogenation de-waxing catalyst prepared using the preparation method is used for hydrogenation de-waxing, catalyst selectivity is increased, the pour point of heavy lubricating oil base oil can be reduced effectively, and relatively target product yield is maintained.