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Zn-Co/HZSM-5 catalyst for eliminating nitroxide from methane product and its preparing method

A technology of nitrogen oxides and HZSM-5, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of only 34% maximum conversion rate, narrow active temperature range, and ineffective effects, etc. , to achieve the effect of simple preparation method, improved efficiency and obvious effect

Inactive Publication Date: 2005-11-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent (Patent No. USP5149512) pointed out that under an oxygen-containing atmosphere, CH 4 As a reducing agent, Co-ZSM-5 prepared by ion exchange method has the best activity, but the activity temperature range is narrow, and the highest conversion rate is only 34%; another US patent (patent No. USP5260043) increases the Co - Catalytic activity of ZSM-5 catalyst, but the effect is not very obvious, and the preparation method is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Catalyst of the present invention uses cobalt and zinc as active component, is loaded on the artificially synthesized silicon-aluminum ratio and is on the HZSM-5 of 25, and the weight percent of cobalt carried on the molecular sieve is 2%, and the weight percent of zinc is 2%, namely: Zn-Co / HZSM-5 (1:1:50);

[0019] Now take the Zn-Co / HZSM-5 catalyst (silicon-aluminum ratio is 25) that contains Zn2%, Co2% (percentage by weight) as an example to generally describe the preparation of the catalyst used in the present invention, specifically: adopt Cobalt nitrate and zinc nitrate configuration containing Zn 2+ and Co 2+ A solution of 2% (percentage by weight) is used as the impregnation solution. Take 2ml of the solution and impregnate it on 2 grams of HZSM-5 molecular sieve, heat and stir at 80°C for 6 hours, let it stand for 24 hours, and bake it at 120°C for 3 hours. Put it in a muffle furnace and bake at 700°C for 6 hours. Finally, the catalyst is pressed into tablets...

Embodiment 2

[0035] The preparation of embodiment 2Zn-Co / HZSM-5 (1: 2.5: 50) catalyst

[0036] The difference from Example 1 is that the impregnation solution contains Co 2+ 5%, containing Zn 2+ 2% solution, Zn-Co / HZSM-5 (1: 2.5: 50) catalyst was prepared in the same manner as in Example 1.

Embodiment 3

[0039] Example 3. Activity test of catalyst in the selective reduction of nitric oxide by methane under oxygen-enriched conditions

[0040] Activity tests were performed in a fixed bed reactor. Before entering the reactor, nitrogen monoxide, methane, oxygen and helium are fully mixed in the mixer, the amount of catalyst used in the activity test is 0.8ml, the inner diameter of the reactor is 10mm, and the space velocity GHSV of the raw material gas is 3600h -1 , the reaction pressure is normal pressure, the reactor is placed in a temperature-controlled electric furnace, and the reaction temperature is 350-600°C. The reaction product was analyzed by on-line chromatography, and the catalyst activity was measured by the conversion rate (%) of nitric oxide into nitrogen.

[0041] Test result analysis example 1

[0042] Table 1 lists the catalytic activity test comparison of the catalysts prepared in Comparative Examples 1 and 2 and Example 1 according to Example 3. It can be see...

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Abstract

The catalyst has Zn and Co carried on natural or artificially synthesized HZSM-5 molecular sieve, which has Si / Al ratio of 5-50, carried Co in 0.5-20 wt% and arried Zn in 0.1-20 wt%. The Zn-Co / HZSM-5 catalyst is prepared via simultaneous soaking process and the soaking liquid is mixed solution of soluble Zn salt and Co salt. The present invention uses methane as reducing agent and adds cheap Zn to raise the catalytic activity of the catalyst.

Description

technical field [0001] The invention relates to a catalyst, in particular to a Zn-Co / HZSM-5 catalyst used for methane elimination of nitrogen oxides and a preparation method thereof. Background technique [0002] Environmental pollution and its prevention and control is a subject of worldwide attention. Therefore, it is particularly important to eliminate nitrogen oxides (nitrogen monoxide and nitrogen dioxide as the main air pollutants) which are one of the main sources of air pollution. The NOx formed in the atmosphere, every year in the world: due to lightning, forest fires, volcanic eruptions, and the decomposition of bacteria on a large amount of organic matter, the natural generation is as much as 500 million tons; the NOx produced by human production and living activities reaches 5,000 tons However, due to the high concentration of NOx emitted by humans, the emissions are mostly concentrated in densely populated areas such as cities and industrial areas, thus causing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/42
Inventor 任丽丽张涛徐长海
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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