ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)