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Preparation method of whisker reinforced preformed catalyst carrier or catalyst

A catalyst carrier and catalyst technology, applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problem of low crushing strength, and achieve the effects of low cost, simple and convenient preparation, and no pollution

Active Publication Date: 2011-04-27
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to make better use of the micro-reinforcement effect of whiskers, aiming at the problems that the existing solid shaped catalyst carrier or catalyst is difficult to shape or has low crushing strength after molding, and introduces micro-reinforcement of whiskers into the specific molding preparation During the process, the dispersion state of the whiskers in the matrix is ​​improved to obtain a high crushing strength shaped catalyst carrier or catalyst preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Use 50wt% of silica sol (converted according to the amount of silica, the meaning of the expression in the same case below is the same) as the matrix, 50wt% of alumina whisker (diameter is 0.1μm, aspect ratio range is 2 to 50), mix well Finally, continue to add dispersant carboxymethyl cellulose solution, wherein the percentage of carboxymethyl cellulose accounting for the total mass of the matrix and whiskers (mixture) is 1wt%, after fully kneading, extruding, drying and putting into the Baked in a Furnace at 550°C. The obtained molding material is columnar, with a volume equivalent diameter of 2.5 mm and an anti-shattering strength of 8 MPa.

Embodiment 2

[0035] With cerium oxide 99.5wt% as the matrix, zirconia whiskers 0.5wt% (diameter is 1 μm, aspect ratio is more than 50), after mixing evenly, continue to add dispersant methyl cellulose solution and active component silver nitrate solution, The percentages of methyl cellulose and silver nitrate in the mass of the mixture are 0.1 wt% and 10 wt% respectively. After kneading fully and evenly, extrusion molding is carried out, and after drying, it is put into a muffle furnace for roasting at 200°C. The obtained molding material is spherical, has a volume equivalent diameter of 2 mm, and an anti-shattering strength of 4 MPa.

Embodiment 3

[0037] Use 30wt% titanium oxide, 20wt% cerium oxide as the matrix, and 50wt% zirconia whiskers (with a diameter of 2 μm and an aspect ratio ranging from 50 to 100). The percentage of the total mass of whiskers and whiskers is 5wt%. After kneading fully and evenly, extrusion molding is carried out, and after drying, it is put into a muffle furnace for roasting at 800°C. The obtained molding material is in the shape of a spoke, with a volume equivalent diameter of 5.5 mm and a crushing strength of 11 MPa.

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Abstract

The invention discloses a method for preparing a crystal whisker enhanced forming catalyst carrier or catalyst, which comprises a method for preparing a crystal whisker enhanced forming catalyst carrier and a method for preparing a crystal whisker enhanced forming catalyst. In the method of the invention, a forming substrate is added with one or more crystal whisker enhanced materials, of which the diameter is 0.1 to 5mu m, and the length-diameter ratio is no less than 2, and a dispersing agent which is correspondingly used to improve the dispersing state of the crystal whisker in the substrate, and after evenly mixed, the mixture is subjected to forming and roasting, and the catalyst carrier is obtained. The crystal whisker enhanced forming catalyst carrier or catalyst has higher anti-crushing strength; and by the forming method, the catalyst carrier or catalyst in various shapes can be prepared the forming process is simple and convenient, and the method is suitable for mass industrialized production.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a method for preparing a whisker-reinforced molded catalyst carrier or a whisker-reinforced molded catalyst. Background technique [0002] The development of the chemical industry largely depends on the development and research of catalysts, among which the gas-solid heterogeneous catalytic process in which the reactants are in the gas phase and the catalyst is in the solid phase is more common, such as only metal-supported catalysts in solid catalysts. One class has been widely used in various reactions such as hydrogenation, dehydrogenation and oxidation. However, for an industrial solid catalyst, it must not only have the characteristics of good activity, high selectivity, stable activity and long service life, but also must have a suitable shape and high crushing strength to resist actual handling, loading, During the reaction process, the impact and wear between the par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/00B01J37/02B01J32/00B01J21/08B01J21/04B01J23/66B01J21/06
Inventor 陆小华杨祝红陈闪山朱银华刘金龙冯新
Owner NANJING TECH UNIV