Method for encapsulating homogeneous catalyst in pore channels of mesoporous molecular sieve

Abstract

A method for encapsulating a homogeneous catalyst in pore channels of a mesoporous molecular sieve comprises the following steps: the mesoporous molecular sieve is fed into a vacuum container, air is extracted, a well prepared homogeneous catalyst solution is injected into the vacuum container containing the molecular sieve, a sample is obtained after stirring and vacuumizing, placed on a quartz plate and smeared uniformly with a diluting agent, the aired quartz plate is placed in a low-temperature vacuum atomic layer deposition equipment, an oxide precursor is subjected to primary pulse treatment and air-suppressing reaction, and a physically absorbed part is removed through air extraction; secondary pulse treatment is performed, steam and the oxide precursor are subjected to the air-suppressing reaction, and unreacted materials are discharged through air extraction; the two steps are repeated, an oxide is obtained through deposition on the surface of a sample base, the total thickness of a film is controlled by changing the cycling times of the two steps, and the size of pores, at seals, of the mesoporous molecular sieve is controlled. The method has the advantage that the homogeneous catalyst is easy to separate and is recyclable.

Description

technical field [0001] The invention belongs to a catalyst and a preparation method, in particular to a method for encapsulating a homogeneous catalyst in a channel of a mesoporous molecular sieve. Background technique [0002] Metal complex catalysts, especially homogeneous catalysts with chiral ligands, are very important for the development of chemical, biological and pharmaceutical industries. However, these homogeneous catalysts often have the problems of difficult recovery and product separation, causing their application to bring environmental and product quality problems. At present, the immobilization of homogeneous catalysts to obtain heterogeneous catalysts is an important way to achieve effective separation after the reaction. Compared with traditional covalently bonded heterogeneous catalysts, nanoreactors are constructed by non-covalently encapsulating homogeneous catalysts into mesoporous or mesoporous molecular sieve channels, showing a degree of freedom com...

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Problems solved by technology

[0004] In order to solve the problem that most existing metal complexes are difficult to separate and cannot be reused as homogeneous catalysts, the purpose of the present inv...

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