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High-stability integral titanium-silicalite-molecular-sieve catalyst and preparation method thereof

A titanium-silicon molecular sieve, high-stability technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult diffusion of heat accumulation, low selectivity of main products, and poor catalyst stability. The effect of fast heat transfer, suppression of side reactions, and improvement of stability

Active Publication Date: 2018-09-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve a series of problems caused by strong heat release in the reaction process of olefin epoxidation catalyzed by titanium-silicon molecular sieve, such as the threat of heat accumulation that is difficult to diffuse to safe production, low selectivity of main products, and poor catalyst stability. Wait

Method used

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  • High-stability integral titanium-silicalite-molecular-sieve catalyst and preparation method thereof
  • High-stability integral titanium-silicalite-molecular-sieve catalyst and preparation method thereof
  • High-stability integral titanium-silicalite-molecular-sieve catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A stainless steel carrier with a cross-sectional diameter of 15mm, a height of 10cm, a porosity of 40 mesh, and a material of SUS316L was used. At 25°C, the carrier was soaked in 40% hydrofluoric acid for 24 hours, and then washed with deionized water until neutral; At 25°C, drop triethylenetetramine solution with a concentration of 50g / L into the pores of the carrier, so that each channel is filled with triethylenetetramine, put the carrier into a centrifuge, and centrifuge at a speed of 100r / min. 2min, take out the carrier; mix 10g of TS-PA powder prepared in Comparative Example 1 with 1.5g of polymethylacrylate, 10g of ethanol and 50g of water, stir evenly, and rotary evaporate at 40°C for 20min to obtain a viscous suspension. Add it dropwise into the above-mentioned treated carrier channels for coating treatment, put it in an oven at 80°C for 12 hours, take it out and bake it at 540°C for 5 hours to obtain a monolithic TS-1 catalyst, which is designated as TS-MA. Th...

Embodiment 2

[0061] The TS-PA powder in Example 1 was replaced with the TS-PB powder prepared in Comparative Example 2, and the other steps were the same as in Example 1, and the obtained monolithic TS-2 catalyst was designated as TS-MB. The coating thickness is 0.15mm.

Embodiment 3

[0063] The TS-PA powder in Example 1 was replaced with the TS-PC powder prepared in Comparative Example 3, and the other steps were the same as in Example 1, and the obtained monolithic Ti-MWW catalyst was designated as TS-MC. The coating thickness is 0.15mm.

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Abstract

The invention provides a high-stability integral titanium-silicalite-molecular-sieve catalyst. The high-stability integral titanium-silicalite-molecular-sieve catalyst comprises active component titanium silicalite molecular sieves and a stainless steel carrier with certain ducts. The invention further provides a preparation method of the high-stability integral titanium-silicalite-molecular-sievecatalyst. According to the preparation method, after the active component titanium silicalite molecular sieves are mixed with adhesives, alcohols and water proportionally, the mixture is applied to the surface-treated stainless steel carrier with the certain ducts to enhance heat transfer. The high-stability integral titanium-silicalite-molecular-sieve catalyst has the advantages that the heat transfer speed is high, main reactions in strong exothermic reactions are promoted, auxiliary reactions are inhibited, and stability is improved; simplicity and convenience in filing and demounting areachieved, the load adjustment range of the active component is wide, the load intensity is high, and the like.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a method for preparing an integral titanium-silicon molecular sieve catalyst with high stability for strong exothermic oxidation reactions such as olefin epoxidation. Background technique [0002] Since the synthesis of titanium-silicon molecular sieve TS-1 was first reported in US Patent US4410501 in 1983, its oxidation system with hydrogen peroxide has shown high activity for olefin epoxidation, aromatic hydrocarbon hydroxylation, and ketone ammoxidation. Moreover, the by-product is water, which belongs to an environmentally friendly process, so it has attracted widespread attention. [0003] In the next 30 years, researchers have synthesized a variety of titanium-silicon molecular sieves with different pore structures, so that titanium-silicon molecular sieves can adapt to the reactions of molecules of different sizes, and have successively catalyzed the hydroxylation of ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89C07D301/12C07D303/04
CPCB01J29/89C07D301/12C07D303/04
Inventor 左轶郭新闻刘民范嘉琳
Owner DALIAN UNIV OF TECH
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