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Integral type denitration catalyst for selective catalytic reduction of CH4 to NO, and preparation method thereof

A denitration catalyst, an integrated technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. problem, to achieve the effect of low price, good application prospects and improved stability

Active Publication Date: 2016-10-26
湖北思搏盈环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, automotive catalysts are made of cordierite as a carrier, loaded with noble metals (Pt, Pd, Rh) and CeZr-based composite oxides with oxygen storage function and their high-activity and high-stability coating materials. However, most of the previous research focused on above 400°C, but the exhaust temperature of diesel vehicles is usually concentrated between 150°C and 350°C. At the same time, precious metals are relatively expensive and difficult to obtain, which limits the promotion of catalysts. Therefore, the development of low-cost, low-temperature and high-efficiency It is an inevitable trend of the development of the times that automobile exhaust purification catalysts replace precious metal catalysts, and it is the correct choice in line with my country's national conditions

Method used

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  • Integral type denitration catalyst for selective catalytic reduction of CH4 to NO, and preparation method thereof
  • Integral type denitration catalyst for selective catalytic reduction of CH4 to NO, and preparation method thereof
  • Integral type denitration catalyst for selective catalytic reduction of CH4 to NO, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] The preparation of catalyst coating carrier in the present embodiment:

[0032] Based on 10g of zirconia powder, different types of binders were selected, and then zirconia powder, zirconia powder with 8% to 30% of the weight of the binder and distilled water were prepared into a suspension slurry. The data are shown in Table 1. Shown, electric stirring at the same frequency for 10 minutes, after forming a uniform slurry, immerse 2g of the prepared cordierite samples in each slurry, and assist the coating in a vacuum state for 12 hours, take out and blow off the residual slurry of the cordierite channels, and heat at 60°C After baking for 2 hours, it was calcined at 110° C. for 6 hours, and then calcined at 500° C. for 3 hours in a nitrogen atmosphere, so as to prepare a monolithic catalyst carrier.

[0033] In this implementation case, the solidity detection of the integral catalyst coating carrier:

[0034] Take the above-mentioned monolithic catalyst coating carrier...

Embodiment 2

[0040] The preparation of catalyst coating carrier in this embodiment

[0041] Take 2g of sodium carboxymethyl cellulose and add it to 10g of zirconia powder, mix evenly, add 85mL of deionized water, and stir electrically for 10 minutes to form a uniform slurry. Take the cordierite honeycomb carrier and dip it in the slurry, and vacuum for 12 hours to assist the coating. Take out and blow off the remaining slurry of cordierite channels, bake at 60°C for 3 hours, bake at 110°C for 6 hours, and then calcinate at 500°C for 3 hours in a nitrogen atmosphere to obtain a monolithic catalyst-coated carrier.

[0042] The loading of catalyst active component in the present embodiment:

[0043] Configure 50%, 38%, 33% and 28% manganese nitrate solution 50mL to load the above-mentioned catalyst coating carrier respectively, prepare four kinds of catalysts, let stand at normal temperature for 24h, take out and blow off the residual manganese nitrate solution in the channel, and After baki...

Embodiment 3

[0048] The preparation of catalyst coating carrier in the present embodiment:

[0049] Take 2g of sodium carboxymethyl cellulose and add it to 10g of zirconia powder, mix evenly, add 85mL of deionized water, stir it electrically for 10 minutes to form a uniform slurry, take the cordierite honeycomb carrier and dip it in the slurry, vacuum 12h for auxiliary coating, Take out and blow off the remaining slurry of cordierite channels, bake at 60°C for 3 hours, bake at 110°C for 6 hours, and then calcinate at 500°C for 3 hours in a nitrogen atmosphere to obtain a monolithic catalyst-coated carrier.

[0050] The loading of catalyst active component in the present embodiment:

[0051] Add 2.95g, 3.69g, 5.0g and 9.52g of cerium nitrate crystals respectively in 50mL, 38% manganese nitrate solution to make it dissolve, and load the above-mentioned catalyst coating carrier after the two materials are mixed uniformly to prepare four kinds of catalysts, Stand still at 25°C for 24h, take o...

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Abstract

The invention relates to the technical field of treatment and control of automobile tail gas, specifically to an integral type denitration catalyst for selective catalytic reduction of CH4 to NO, and a preparation method thereof. The denitration catalyst is prepared through the following steps: with cordierite honeycomb ceramic and zirconium dioxide as carriers, loading a mixed solution of manganese nitrate and cerium nitrate onto the carriers, and carrying out calcination. The catalyst provided by the invention is a low-medium temperature catalyst, can utilize mixed gas in simulated flue gas, can realize good denitration efficiency under the window of a low temperature of 200 to 300 DEG C, and can reach an NO conversion rate of 70% at a catalytic reduction temperature of 250 DEG C; the preparation method for the coating carriers of the catalyst provided by the invention has the advantages of cheap and easily-available raw materials and simple and practicable preparation process; and the integral type catalyst can be applied in a removal technology of nitrogen oxides in tail gas of diesel vehicle, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of automobile exhaust treatment control, in particular to a CH 4 The invention relates to a monolithic denitrification catalyst for selective catalytic reduction of NO and a preparation method thereof. Background technique [0002] With the rapid development of industry and transportation, the emission of nitrogen oxides in the exhaust of thermal power plants and automobiles has increased year by year, and environmental problems such as acid rain, photochemical smog and smog have become increasingly serious. According to the results of the 2011 "Annual Report on the Prevention and Control of Motor Vehicle Pollution in China", motor vehicle pollution has become the most prominent and urgent problem in the atmospheric environment. However, the trend of "dieselification" in vehicle power is becoming more and more obvious. NH 3 -SCR technology has been deeply researched and widely used in the field of diesel v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34
CPCB01J23/34B01J2523/00B01J2523/72B01J2523/3712B01J2523/48
Inventor 张先龙郭亚晴吴雪平
Owner 湖北思搏盈环保科技股份有限公司
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