A kind of preparation method of large particle diameter titanium silicon molecular sieve

Abstract

The invention discloses a preparation method of a large-particle-size titanium silicon molecular sieve, which comprises the following steps: adding an inorganic silicon source into an organic template water solution at 30-90 DEG C, sufficiently stirring for 0.2-2 hours, adding an inorganic titanium source, sufficiently stirring for 0.5-4 hours, uniformly mixing, adding an alkali source at one time, and carrying out hydrothermal crystallization on the mixed solution (composed of the following components in parts by mole: 1 part of SiO2 in the inorganic silicon source, 0.01-0.03 part of TiO2 in the inorganic titanium source, 0.02-0.2 part of organic template, 20-80 parts of alkali source and 30-70 parts of alkali source) at 120-200 DEG C for 2-10 days; and filtering, washing, drying and roasting to obtain the titanium silicon molecular sieve. The titanium silicon molecular sieve catalyst prepared by the method has uniform particle size, has the average particle size of greater than 10 micrometers, and is easy for separation and recovery after reaction. The method can enhance the reutilization rate, has the advantages of fewer synthesis steps, low cost and high product quality stability, and is simple to operate.

Description

technical field [0001] The invention relates to a preparation method of a titanium-silicon molecular sieve, in particular to a preparation method of a large-diameter titanium-silicon molecular sieve. Background technique [0002] Titanium-silicon molecular sieve is the introduction of transition metal titanium atoms into the molecular sieve framework with a certain topology to form a porous crystalline material with catalytic oxidation activity. Titanium-silicon molecular sieves can be used to catalyze various organic oxidation reactions, such as olefin epoxidation, alkane partial oxidation, alcohol oxidation, phenol hydroxylation, cyclic ketone ammoxidation, etc. As an oxidant, hydrogen oxide has high reaction selectivity, relatively simple process, and has incomparable advantages of energy saving, economy, and environmental friendliness compared with traditional oxidation systems, and is considered to be a typical representative of environmentally friendly catalysts. [0...

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Problems solved by technology

[0008] The present invention aims at the deficiencies of the prior art, and provides a method for preparing a large-diameter titanium-silicon molecular sieve. The titanium-silicon molecular sieve prepared by the present invention can better solve the problem that the small-particle-diameter titanium-silicon molecular sieve is difficult to separate from the product in industry. and recovery issues, to improve catalyst reuse

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