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Extrusion molding method for high-strength TS-1 (Titanium Silicalite-1) catalyst

A titanium-silicon molecular sieve, TS-1 technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reducing the mechanical strength, wear or breakage of shaped catalysts, and avoid catalyst deactivation, Effect of preventing sintering and strong mechanical strength

Inactive Publication Date: 2013-04-17
DALIAN LIGONG QIWANGDA CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] At the same time, the existing TS-1 molding method reduces the mechanical strength of the shaped catalyst after introducing the above-mentioned pore-forming agent, and is more likely to be worn or broken during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The mass percent of the micron TS-1 powder and the wet plastomer after kneading is respectively 3% citric acid, 5% polyacrylonitrile-based activated carbon fibers with a fiber length of 3 mm and 0.2% boric acid. After kneading, the mass percentage of the wet plastomer is 25% silica sol solution (SiO 2 content is 30%) fully stirred and kneaded to obtain a plastic molded body; use an all-stainless steel kneading extruder, extrude it into a wet long solid cylinder through a Φ1.5mm orifice plate, and bake it in an oven at 40°C for 10 hours. At a heating rate of 2°C / min to 550°C, and calcined at 550°C for 12 hours, a columnar catalyst sample C was obtained, and its mechanical strength increased by 80.5% compared with that of sample A.

Embodiment 2

[0043] Repeat Example 1, but replace the micron TS-1 molecular sieve powder with nanometer TS-1 molecular sieve powder to obtain shaped catalyst sample D, whose mechanical strength is increased by 82.4% compared with sample B.

Embodiment 3

[0045] Repeat Example 1, but change the addition amount of boric acid to 5% and 10%, and then obtain samples E and F, and their mechanical strengths are respectively increased by 101.4% and 120.1% compared with sample A.

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Abstract

The invention provides an extrusion molding method for a high-strength TS-1 (Titanium Silicalite-1) catalyst. The method is characterized by comprising the following steps of: proportionally kneading TS-1 raw powder, silica sol, an extrusion aid, activated carbon fibers and boric acid so as to form a wet plastomer; and then drying and roasting, thereby obtaining the extrusion-molded TS-1 catalyst. During molding, the activated carbon fibers are introduced, and diffusion channels which run through whole particles are then formed after roasting, so that the efficiency for heat and mass transfer is increased, the secondary side reaction and catalyst deactivation caused by product retention are avoided, and the agglomeration of catalyst particles caused by adverse heat dissipation is prevented. Meanwhile, during molding, the boric acid is introduced, and the mechanical strength of the molded catalyst is then improved after roasting, so that the impact generated during the processes of transporting, loading and using and the abrasion caused by fluid flow can be effectively resisted, thereby being beneficial to the prolongation of the service life of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, and relates to a molding method of a high-strength titanium-silicon molecular sieve catalyst. Background technique [0002] Titanium silicalite-1 is a new heteroatom molecular sieve with MFI structure developed in the early 1980s, referred to as TS-1. TS-1 molecular sieve has great application potential in the field of selective oxidation. The following patents and publications describe applications of TS-1: [0003] Such as CN1376151A(2000-08-08), CN1314348A(2001-03-30), CN1387948A(2002-02-05), CN1534030A(2003-03-28), CN1651405A(2004-11-04), CN1769277A(2005- 11-14), CN1810772A(2006-01-24), CN101172970A(2007-10-12), Journal of Catalysis, 25(2004)49-54; Molecular Catalysis, 19(2005)7-11; Journal of Petroleum (Petroleum Processing ), 22(2006) 72-77; Applied catalysis A: General, 246(2003) 69-77; Journal of molecular catalysis A: chemical, 210(2004) 171-178; Journal of molecular c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89B01J35/02B01J35/00
Inventor 郭洪臣贾玉华李海龙张立兴胡阳
Owner DALIAN LIGONG QIWANGDA CHEM TECH
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