Efficient CH4-SCR denitration catalyst under oxygen-enriched condition and preparation method and application thereof

A CH4-SCR, denitrification catalyst technology, applied in the field of high-efficiency CH4-SCR denitration catalyst and its preparation, can solve the problems of high requirements for equipment and pipelines, high price, reduced catalytic activity, etc., and achieve a wide activity temperature window, good Anti-SO2 performance, good selective catalytic activity effect

Inactive Publication Date: 2017-06-09
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

NH 3 -SCR has high activity and long service life under oxygen-enriched conditions, and has good sulfur resistance, although NH 3 -SCR has been industrialized, but there are still obvious deficiencies: 1) The requirements for equipment and pipelines are high, and the price is expensive; 2) The sulfur species in the exhaust gas is oxidized on the surface of the catalyst, which eventually leads to the deactivation of the catalyst and the blockage of the pipeline. And corrode the pipeline; 3) NH 3 and NO x The ratio of NH must be strictly controlled within the range of 0.8 to 1.0, excessive or completely adsorbed NH 3 will cause secondary pollution
[0005] Currently, for CH 4 Reduce NO x Catalysts mainly include noble metal catalysts, metal oxide catalysts and molecular sieve catalysts. From the existing research, some catalysts show better catalytic CH 4 -SCR denitrification activity, however, the catalytic activity of the above-mentioned catalysts still needs to be improved, and under the condition of rich oxygen, the catalytic activity will be reduced, and at higher O 2 Catalytic CH with high selectivity under high concentration, high space velocity, low temperature and wide temperature window 4 -SCR denitrification research is rarely reported

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  • Efficient CH4-SCR denitration catalyst under oxygen-enriched condition and preparation method and application thereof
  • Efficient CH4-SCR denitration catalyst under oxygen-enriched condition and preparation method and application thereof
  • Efficient CH4-SCR denitration catalyst under oxygen-enriched condition and preparation method and application thereof

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Embodiment 1

[0047] Catalyst preparation.

[0048] The preparation method of the catalyst in this paper adopts the liquid phase ion exchange method,

[0049] With molecular sieve H-Beta as carrier, H-ZSM-5, H-SAPO-34 and H-MOR as control samples, Si / Al=25, In(NO 3 ) 3 4H 2 O is a precursor.

[0050] During the preparation of the catalyst, first prepare 100ml of indium nitrate solution with a concentration of 0.033M, then add 3g of molecular sieve powder to the solution, mix well and place it on a magnetic stirrer, and magnetically stir it in a constant temperature water bath at 85°C for 8h for ionization. Exchange, put the stirred solution on the Buchner funnel, filter it with a positive air pump, wash it with water until the pH of the supernatant is 7, pour off the filtrate, take out the filter cake on the filter paper and put it in the oven, and put it in the oven. Set the temperature to 80°C, then bake for 12 hours. The dried catalyst was taken out and ground, and then put into a t...

Embodiment 2

[0052] Catalyst activity evaluation.

[0053] The catalyst activity evaluation method is the temperature programmed surface reaction (TPSR) method. The concentration of each component in the reaction gas is: NO is 500ppm, CH 4 500ppm, O 2 5%, Ar is the balance gas. The total gas flow rate is 100ml / min, and the catalyst consumption is 100mg. Before the temperature program, let the reaction gas pass through the catalyst at room temperature, and absorb the reaction gas for about 1 hour until the NO x The readings of the analyzer basically did not change, indicating that the catalyst was in a state of adsorption saturation, and then the temperature program was started, from 40°C to 600°C at a rate of 4°C / min. The reaction product was detected by gas chromatography GC2014 and NO x Analyzer determination.

[0054] The performance analysis of the catalyst obtained under the optimal preparation conditions has been carried out under various reaction conditions, and the reaction c...

Embodiment 3

[0064] Investigate the catalysts prepared by different supports to catalyze CH 4 Reduce NO x Reactivity effects, such as figure 1 shown. Depend on figure 1 (a) It can be seen that different carriers have different effects on NO x The influence of the removal rate can be seen that when SAPO-34 is used as the carrier, the catalyst has almost no catalytic activity; the catalytic activity of the catalyst with the MOR carrier is low, and the NO x The removal rate does not exceed 20%; the catalyst with ZSM-5 as the carrier has the best activity in the temperature range below 430 °C, NO x The highest removal rate can reach 50%; the catalyst with H-Beta as the carrier has the highest catalytic activity in the temperature range of 430 ° C ~ 600 ° C, NO x The highest removal rate can reach more than 90%. This result shows that the In / H-Beta molecular sieve catalyst is effective for NO x showed superior catalytic activity. Depend on figure 1 (b) and different carrier pair CH in ...

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Abstract

The invention provides an efficient CH4-SCR denitration catalyst under an oxygen-enriched condition and a preparation method and application thereof. The efficient CH4-SCR denitration catalyst is characterized in that the active component of the efficient CH4-SCR denitration catalyst is indium, the indium is supported on an H-Beta molecular sieve, and the weight content of the indium is 5.52-8.20wt% of that of the H-Beta molecular sieve. Compared with the prior art, the efficient CH4-SCR denitration catalyst has the advantages that the catalyst has good selective catalytic activity under high O2 concentration and high air speed, NOx removing rate is close to 100%, CH4 utilization rate can exceed 100%, and the catalyst is wide in activity temperature window and good in SO2 resistance.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a high-efficiency CH catalyst under oxygen-enriched conditions. 4 -SCR denitration catalyst and its preparation method and application. Background technique [0002] NO x It is one of the main air pollutants, which can cause photochemical smog, form acid rain, destroy the atmospheric environment, and endanger human health. NO x It mainly comes from mobile source and stationary source flue gas emissions, such as automobile exhaust, nitric acid plant exhaust gas, waste incineration plant, refinery flue gas and thermal power plant flue gas, among which about 95% of NO x Exhaust emissions from vehicles and other vehicles and smoke emissions from thermal power plants. [0003] At present, the catalytic reduction method is currently a more researched NO x Removal methods, including non-selective catalytic reduction and selective catalytic reduction. Selective reduction means th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01D53/90B01D53/56
CPCB01J29/7049B01D53/8628B01D53/90B01D2251/208B01D2255/209B01D2255/50B01D2258/0283
Inventor 朱荣淑张改革温正中
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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