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Effect of SO2 on SCR activity of MnOx/PG catalysts at low temperature

Xian-Long Zhang, Shuang-Shuang Lv, Cui-Ping Zhang, Xue-Ping Wu, Lian-Feng Zhang, Jun-Wei Wang, Xiao-Bin Jia, and Heng-Jian Zhang

School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230001, China

 

E-mail: xuepingw@ustc.edu.cn

Abstract: Palygorskite (PG)-supported manganese oxide catalysts (MnOx/PG) were prepared for the selective catalytic reduction (SCR) of NO with ammonia in the presence of SO2 at low temperature. The influence of gaseous SO2 on the performance of the catalyst was studied by means of specific surface area (Brunauer-Emmett-Teller, BET) analysis, scanning electron microscopy (SEM), thermogravimetric (TG) analysis, temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The results showed that the SCR activity of Mn10/PG was significantly inhibited by gaseous SO2 at temperatures below 300°C. However, the SCR activity of Mn10/PG was markedly promoted by SO2 in a higher temperature range of 300°C to 500°C. The sulphating of surface active species (MnOx) was suggested to inhibit the oxidation of NH3 to NO leading to enhancement of the SCR activity at a higher temperature range of 300°C to 500°C and decrease in the SCR activity at temperatures below 300°C.

Keywords: palygorskite-supported manganese oxide catalyst – low-temperature selective catalytic reduction – SO2 deactivation – metal sulphates

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0175

 

Chemical Papers 69 (12) 1548–1555 (2015)

Sunday, September 26, 2021

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