Multilevel pore channel SAPO-11 molecular sieve and synthetic method of hydrocarbon isomerization catalyst

Abstract

The invention relates to a multilevel pore channel SAPO-11 molecular sieve and a synthetic method of a hydrocarbon isomerization catalyst. The synthetic method comprises the following steps of uniformly mixing phosphoric acid, an aluminum source and deionized water, and obtaining a mixed solution by adding a silica source; adding and uniformly dispersing quaternary ammonium salt into the mixed solution, and then adding a template agent; carrying out crystallization, and separating, washing and drying a solid product to obtain SAPO-11 molecular sieve raw powder; and roasting the SAPO-11 molecular sieve raw powder to obtain the SAPO-11 molecular sieve. The invention also provides the synthetic method of the hydrocarbon isomerization catalyst which takes the multilevel pore channel SAPO-11 molecular sieve as raw materials. In the synthetic method, the quaternary ammonium salt is added into a conventional SAPO-11 molecular sieve reaction system to synthetize the multilevel pore channel SAPO-11 molecular sieve. Compared with the traditional synthetic method of the SAPO-11 molecular sieve, the synthetic method can dramatically enhance the specific surface area of the SAPO-11 molecular sieve and increase the pore volume and the pore size of the molecular sieve.

Description

technical field [0001] The present invention relates to a kind of synthetic method of multi-stage channel SAPO-11 molecular sieve and hydrocarbon isomerization catalyst, especially relate to a kind of synthetic method of SAPO-11 molecular sieve with multi-stage channel, high specific surface area and large pore volume, and The method for preparing a hydrocarbon isomerization catalyst using the multi-stage pore SAPO-11 molecular sieve as a raw material. Background technique [0002] The silicoaluminophosphate molecular sieve (SAPO-n) is an aluminum phosphate molecular sieve (AlPO 4 -n) Derivatives of molecular sieves are novel non-zeolite molecular sieves synthesized for the first time in 1982 by Union Carbide Corporation of the United States. SAPO-11 molecular sieve is a member of its family. It has a one-dimensional non-intersecting ten-membered ring elliptical channel with a pore size of 0.39nm×0.64nm. Because of its suitable protonic acid, unique pore structure, and good...

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Problems solved by technology

However, the SAPO-11 molecular sieves synthesized using ionic liquids as media and templates contain more heterocrystals, and the length of the alkyl chain in the ionic liquid used can only be below four carbons. If the alkyl chain is too long, it will Affects the solubility of reactants in ionic liquids

[0008] In the current technology, di-n-propylamine or diisopropylamine is the commonly used template for synthesizing SAPO-11 molecular sieves. The synthesized SAPO-11 molecular sieves have a small external area and a single channel. In the chemical reaction, the selectivity to single branched chain is better, but the selectivity to double branched chain and multi branched chain is poor, the reason is that the pore size of SAPO-11 molecular sieve limits the mass transfer of double branched chain and multi branched chain hydrocarbons, As an FCC gasoline hydrogenation reforming catalyst, it is unfavorable to restore gasoline octane number

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