Cobalt-chromium modified catalyst and its preparation method and application

A technology of catalysts and metal catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of limited catalyst improvement and weak conversion, and achieve the promotion of redox sites and Effect of acidic sites, increased adsorption rate, increased capacity

Active Publication Date: 2020-08-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

so, with doping V 2 o 5 materials compared to TiO doped with rhenium vanadate 2 / WO 3 / (SiO 2 ) material has better thermal stability, however, the inventors found that at operating temperatures below 300°C it is x conversions are still weak
It can be seen that under the premise of not changing the traditional vanadium-tungsten-titanium system, simply changing the form of vanadium in the catalyst can improve the catalyst to a limited extent. Although there are different degrees of improvement, the structure and SCR of the catalyst still need to be investigated. The mechanism of the reaction is to find that the catalyst can maintain high catalytic activity and thermal stability when the vanadium content is reduced

Method used

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  • Cobalt-chromium modified catalyst and its preparation method and application
  • Cobalt-chromium modified catalyst and its preparation method and application
  • Cobalt-chromium modified catalyst and its preparation method and application

Examples

Experimental program
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Effect test

preparation example 1-10

[0044] Preparation Example 1-10 Preparation of cobalt-chromium modified catalyst

[0045] Unless otherwise specified, the metal elements in the catalyst come from the following raw materials: chromium nitrate, tungsten phosphate, vanadyl acetylacetonate, titanium dioxide, molybdenum trioxide, cobalt nitrate, cerium nitrate, manganese nitrate; the content of the raw materials is shown in Table 1 below .

[0046] According to the elemental composition in Table 1, after preliminary mixing of the raw materials, put them into a ball mill tank for ball milling, ball milling for 70min, with a rotation speed of 55 rpm, then dry the ball milled mixture (110°C, 6h) and roast in an air atmosphere. Carried out in a furnace, including heating up to 100°C at a rate of 8°C / min and keeping for 10 minutes; then heating up to 200°C at a rate of 8°C / min and keeping for 12 minutes; then heating up to 500°C at a rate of 8°C / min Leave on for 3 hours. After the calcination, the catalyst is cooled...

preparation example 20

[0050] Preparation Example 20 Preparation of cobalt-chromium modified catalyst

[0051] Raw material consumption and composition are the same as Preparation Example 1, adopt the following preparation method:

[0052] After preliminarily mixing the raw materials, put them into a ball mill tank for ball milling, ball milling for 70 minutes at a speed of 55 rpm, then dry the ball milled mixture (110°C, 6h) and roast in an air atmosphere. The roasting is carried out in a muffle furnace. Including heating at a rate of 8°C / min to 500°C for 3 hours. After the calcination is completed, it is cooled with the furnace to obtain a cobalt-chromium modified catalyst in the form of powder with a particle size of 40-80 mesh.

preparation example 21

[0053] Preparation of Preparation Example 21 Cobalt-Chromium Modified Catalyst

[0054] Raw material consumption and composition are the same as Preparation Example 1, adopt the following preparation method:

[0055] Take the raw materials for preliminary mixing, and then put them into a ball mill tank for ball milling, ball milling for 70 minutes, and the speed is 55 rpm; the ball mill mixture is taken out and dried at 110°C for 6 hours, and directly roasted in the air atmosphere at 500°C for 3 hours; finally, it is cooled in the furnace to obtain cobalt - The chromium modified catalyst is a powder with a particle size of 20-90 mesh.

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Abstract

The invention discloses a cobalt-chromium modified catalyst and a production method and application thereof. The cobalt-chromium modified catalyst contains the raw materials of (1) a catalyst carrierand (2) a metal catalyst, wherein the catalyst carrier comprises titanium dioxide; the metal catalyst comprises a chromium source precursor, a cobalt source precursor, a vanadium source precursor anda molybdenum source precursor; and in the catalyst, the vanadium content is not lower than 2 wt%. According to the catalyst, not only can nitric oxides be removed efficiently by the catalyst, but alsosulfur-containing volatile organic matters are subjected to catalytic oxidation, so that synergistic purification of the sulfur-containing volatile organic matters and NOx is achieved at least.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a cobalt-chromium modified catalyst and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Nitrogen oxides (NO x ) and volatile organic compounds (VOCs, Volatile OrCrnic Compounds) and other pollutants are the main precursors of atmospheric haze. NO x It is one of the main pollutants of global air pollution, causing photochemical smog, acid rain, ozone layer destruction and other environmental problems, seriously affecting people's living environment and quality of life, and causing huge damage to the environment and society. Stri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J23/889B01J23/28B01J23/86B01D53/86B01D53/56B01D53/44
CPCB01D53/8628B01D53/8687B01J23/002B01J23/28B01J23/864B01J23/8877B01J23/8878B01J23/8898B01J2523/00B01J2523/3712B01J2523/47B01J2523/55B01J2523/67B01J2523/68B01J2523/845B01J2523/69B01J2523/72
Inventor 王栋彭悦韩奎华李俊华路春美王斌高传
Owner SHANDONG UNIV
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