Regeneration method of deactivated titanium-silicon catalyst, regenerated catalyst and application thereof

Abstract

The invention discloses a regeneration method of a deactivated titanium-silicon catalyst. The method comprises the following steps: (1) mixing a deactivated titanium-silicon catalyst wet material withregenerated mixed liquid, and grinding the mixture by adopting a colloid mill to obtain a uniform material; (2) performing hydrothermal crystallization on the uniform material obtained in the step (1) to obtain a crystallized product; and (3) filtering, washing and calcining the crystallized product obtained in the step (2) to obtain a regenerated catalyst, wherein the mass ratio of the deactivated titanium-silicon catalyst wet material to the regenerated mixed liquid is 1:(1-10). The obtained regenerated catalyst, prepared with the regeneration method of the deactivated titanium-silicon catalyst provided by the invention, has the advantages that the activity is recovered to a fresh agent level, the single-path life is obviously prolonged when the catalyst is used for cyclohexanone ammoximation reaction, only once washing is required during the entire regeneration process, the loss of the catalyst and the generated wastewater are less, the regeneration process is short, the regeneration cost is low, and industrial amplification is easy.

Description

technical field [0001] The invention belongs to the field of fine chemical catalysts, and in particular relates to a method for regenerating a deactivated titanium-silicon catalyst, a prepared regenerated catalyst and an application thereof. Background technique [0002] Since the first report by Taramasso et al. in 1983, TS-1 molecular sieve has been widely concerned by researchers at home and abroad because of the introduction of transition metal heteroatom Ti, which makes it have different catalytic activity from ordinary molecular sieves. TS-1 molecular sieve is an isomorphic substitution derivative obtained by partially substituting Si with Ti in all-silicon molecular sieve. It has the same MFI framework structure as ZSM-5, and the framework titanium is the active center of TS-1 participating in the selective catalytic oxidation reaction. . [0003] In recent years, the "green catalytic oxidation system" composed of TS-1 molecular sieve and hydrogen peroxide solution n...

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Problems solved by technology

[0012] The first object of the present invention is to provide a regeneration method for deactivated titanium-silicon molecular sieves, through a special regeneration process to solve the problems in the prior art that the activity of the deactivated titanium-silicon catalyst is difficult to recover, the regeneration method is complicated, and the regeneration process is long. , to rationally utilize waste titanium silicon catalyst

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