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CrXCo3-XO4 spinel type catalyst and preparation method thereof

A spinel-type catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as poor methane oxidation effect and unsatisfactory tail gas purification effect, and achieve outstanding methane oxidation ability , Abundant raw materials, good thermal stability

Inactive Publication Date: 2010-06-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the object of the invention is to provide a kind of Cr X co 3-X o 4 The spinel-type catalyst and its preparation method solve the technical problems that the catalyst has a poor oxidation effect on the residual methane in the tail gas of natural gas vehicles and the tail gas purification effect is not ideal, and has the advantages of high catalyst purification efficiency, low price, strong anti-poisoning ability, and thermal stability sexual characteristics

Method used

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  • CrXCo3-XO4 spinel type catalyst and preparation method thereof
  • CrXCo3-XO4 spinel type catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0014] Example 1: Cr 0.5 co 2.5 o 4 (X=0.5) Preparation of Catalyst

[0015] A kind of Cr used for purification of exhaust gas of natural gas vehicles X co 3-X o 4 Spinel type catalyst, characterized in that: spinel AB is composed of cobalt element in positive divalent 2 o 4 In the A position of the structure, the chromium element or the chromium element and the positive trivalent cobalt element together constitute the B position; wherein: X=0.5; the positive divalent cobalt element, the positive trivalent cobalt element and chromium in the series of catalysts The molar ratio of elements to oxygen is 1:2:4. Through crystal phase analysis, the spinel structure in the catalyst accounts for 95%.

[0016] A kind of Cr used for purification of exhaust gas of natural gas vehicles X co 3-X o 4 The preparation method of spinel type catalyst, concrete steps are as follows:

[0017] 1. Prepare respectively 0.75mol / L chromium nitrate solution and 0.75mol / L cobalt nitrate solu...

Embodiment 2

[0021] Example 2: CrCo 2 o 4 (X=1.0) Preparation of Catalyst

[0022] A kind of Cr used for purification of exhaust gas of natural gas vehicles X co 3-X o 4 Spinel-type catalyst, composed of cobalt element with positive divalent value, spinel AB 2 o 4 In the A position of the structure, the chromium element or the chromium element and the positive trivalent cobalt element together constitute the B position; wherein: X=1.0; the positive divalent cobalt element, the positive trivalent cobalt element and chromium in the series of catalysts The molar ratio of elements to oxygen is 1:2:4. Through crystal phase analysis, the spinel structure in the catalyst accounts for 98%.

[0023] A kind of Cr used for purification of exhaust gas of natural gas vehicles X co 3-X o 4 The preparation method of spinel type catalyst, concrete steps are as follows:

[0024] 1. Prepare respectively 0.5mol / L chromium nitrate solution and 1.0mol / L cobalt nitrate solution with deionized water; ...

Embodiment 3

[0028] Example 3: Cr 2 CoO 4 (X=2.0) Preparation of Catalyst

[0029] A kind of Cr used for purification of exhaust gas of natural gas vehicles X co 3-X o 4 Spinel-type catalyst, composed of cobalt element with positive divalent value, spinel AB 2 o 4 In the A position of the structure, the chromium element or the chromium element and the positive trivalent cobalt element together constitute the B position; where: X=2.0; the positive divalent cobalt element, the positive trivalent cobalt element and chromium in the series of catalysts The molar ratio of elements to oxygen is 1:2:4. Through crystal phase analysis, the spinel structure in the catalyst accounts for 99%.

[0030] A kind of Cr used for purification of exhaust gas of natural gas vehicles X co 3-X o 4 The preparation method of spinel type catalyst, concrete steps are as follows:

[0031] 1. Prepare respectively 1.0mol / L chromium nitrate solution and 0.5mol / L cobalt nitrate solution with deionized water;

...

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Abstract

The invention relates to a CrXCo3-XO4 spinel type catalyst for purifying tail gas of gas-fueled vehicles. An A site of a spinel AB2O4 structure comprises positive divalent cobalt elements, and a B site comprises chromium elements or chromium elements and positive divalent cobalt elements, wherein the molar ratio of the positive divalent cobalt elements to the sum of positive trivalent cobalt elements and the chromium elements to oxygen elements is 1:2:4. The preparation method of the CrXCo3-XO4 spinel type catalyst comprises the steps of: (1) respectively preparing a chromic nitrate solution and a cobalt nitrate solution with deionized water; (2) according to the proportion of the cobalt elements and the chromium elements, weighing the chromic nitrate solution and the cobalt nitrate solution which are prepared in the step (1), and uniformly mixing the two solutions by magnetic stirring; (3) adding an ammonia solution to regulate the pH value to obtain a suspension; and (4) carrying out vacuum filtration on the suspension obtained in the step (3), putting filter cakes in a drying box for drying, and then, transferring the filter cakes into a muffle furnace for roasting. The CrXCo3-XO4 spinel type catalyst has the characteristics of good heat stability, simple structure, low cost and wide application prospects.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a Cr X co 3-X o 4 Spinel-type catalyst and its preparation method. Background technique [0002] With the continuous improvement of the modernization of human society, the global demand for automobiles is increasing day by day. Automobiles bring convenience to human beings but also bring serious problems. Automobiles consume a large amount of oil resources, exacerbating the oil shortage crisis, and at the same time, the large amount of harmful gases emitted by automobiles cause serious pollution to the environment. In order to solve the two major problems of energy crisis and environmental pollution, all over the world are actively developing the use of natural gas, one of the clean energy sources, as vehicle fuel. With its high efficiency and low pollution as its main characteristics, natural gas vehicles have become an inevitable choice for the development of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86B01D53/94B01D53/86B01D53/72
Inventor 李俊华陈景欢郝吉明
Owner TSINGHUA UNIV
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