ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
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
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.
Chemical Papers 69 (12) 1548–1555 (2015)