Precious metal modification method of titanium silicalite molecular sieve

Abstract

A precious metal modification method of a titanium silicalite molecular sieve is characterized in that the method comprises the following steps: mixing a titanium silicalite molecular sieve, a precious metal source, and an organic alkali solution, treating the mixture in a closed reaction vessel at 100-200 DEG C for at least 2 hours, taking the product out at normal temperature and normal pressure, drying, and roasting to obtain the precious metal modified titanium silicalite molecular sieve product, wherein the water contained in the reaction vessel can form saturated water steam under the reaction condition, and has a weight ratio to the titanium silicalite molecular sieve being less than 1.2, and the treating capacity of the titanium silicalite molecular sieve is at least 10 g per liter of the reaction vessel volume. The method is low in cost, few in three-wastes, and high in efficiency, and the molecular sieve has good catalytic performance.

Description

technical field [0001] The invention relates to a method for modifying a titanium-silicon molecular sieve, and more specifically relates to a method for modifying a titanium-silicon molecular sieve synthesized under the prior art conditions with precious metals. Background technique [0002] Silicon molecular sieve is a new heteroatom molecular sieve developed in the early 1980s. At present, TS-1 with MFI structure, TS-2 with MEL structure, MCM-22 with MWW structure and TS-48 with larger pore structure have been synthesized. Titanium-silicon molecular sieves are used as catalysts, and non-polluting low-concentration hydrogen peroxide can be used as oxidants, which can catalyze various types of organic oxidation reactions, such as epoxidation of alkenes, partial oxidation of alkanes, oxidation of alcohols, and oxidation of phenols. Hydroxylation, ammoxidation of cyclic ketones, etc., avoid the problems of complex oxidation process and environmental pollution, and have the in...

AI Technical Summary

Problems solved by technology

In-situ generation of H by supporting noble metals on titanium-silicon materials 2 o 2 Although the method for selective oxidation of organic matter has mild conditions and good selectivity (up to 95%), the traditional loading method has low activity and poor stability. 2 Low effective utilization

More importantly, a large amount of water is often used in the preparation process, resulting in a large amount of wastewater discharge and a heavy environmental burden.

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