Research progress of low-temperature SCR denitration catalysts

Ruliang NING  Xiaolong LIU  Tingyu ZHU

doi:10.12034/j.issn.1009-606X.218233

The Chinese Journal of Process Engineering >

2019 , Vol. 19 >Issue 2: 223 - 234

DOI: https://doi.org/10.12034/j.issn.1009-606X.218233

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Research progress of low-temperature SCR denitration catalysts

Ruliang NING Xiaolong LIU Tingyu ZHU

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1. School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China 2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China

Received date: 2018-06-12

Revised date: 2018-08-26

Online published: 2019-04-18

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Abstract

Nitrogen oxide NOx (NO, NO2, and N2O) is one of the major pollutants in the air pollution, it can cause environmental problems such as photochemical smog, acid rain, and ozone layer destruction, which has posed threat to people's living environment and quality of life, and attracted great attention from the world. Countries made stricter emission standards for burning emissions from both fixed and mobile sources. The major denitrification technologies include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), oxidative denitrification, and activated carbon adsorption and denitrification at present. The SNCR has higher conditions in industrial applications, the main factors affecting successful operation are temperature, ammonia?nitrogen ratio, distribution of ammonia gas in the flue gas and residence time, so there were certain limitations in industrial application of SNCR. Compared with other denitrification technologies, SCR denitration technology is more widely used in industrial application, in which denitration is mostly arranged after dust removal and desulfurization, at this time, the temperature is mostly between 100?250℃. The performance of SCR denitrification in low-temperature must be improved, which is one of the most promising flue gas DeNOx technology. In this paper, the recent works on low-temperature SCR catalysts were reviewed on manganese-based catalysts, vanadium-based catalysts and carbon-based catalysts. Single-component Mn-based catalysts, supported Mn-based catalysts and composite Mn-based catalysts were reviewed, the effects of preparation of V-based catalysts on the de-dumping and denitrification mechanisms were described. The effect of transition metal doping on C-based catalysts was reviewed. The influence of H2O and SO2 resistance on low-temperature NH3-SCR catalytic activity and reaction mechanism were also discussed. Finally, the virtues advantages and defects of low temperature SCR catalysts were summarized, and the future development direction was also given out.

Key words： low-temperature; selective catalytic reduction; denitrification; catalyst; mechanism

Cite this article

Ruliang NING Xiaolong LIU Tingyu ZHU . Research progress of low-temperature SCR denitration catalysts[J]. The Chinese Journal of Process Engineering, 2019 , 19(2) : 223 -234 . DOI: 10.12034/j.issn.1009-606X.218233

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