Effect of titania addition on the performance of CoMo/Al2O3 sour water gas shift catalysts under lean steam to gas ratio conditions

Liu, Bonan, Zong, Qiuyun, Edwards, Peter P., Zou, Fei, Du, Xian, Jiang, Zheng, Xiao, Tiancun and AlMegren, Hamid (2012) Effect of titania addition on the performance of CoMo/Al2O3 sour water gas shift catalysts under lean steam to gas ratio conditions. Industrial & Engineering Chemistry Research, 51 (36), 11674-11680. (doi:10.1021/ie300555f).

Abstract

Activated carbon honeycomb supported manganese and cerium oxides (MnOx–CeO2/ACH) catalysts were investigated for selective catalytic reduction (SCR) of NO at low temperatures of 80–200 °C. Compared with ACH supported manganese oxide catalyst (MnOx/ACH), MnOx–CeO2/ACH catalysts show much higher SCR activity and higher selectivity to N2. NO conversion can be improved by the addition of CeO2 from less than 50% to 100% at 80–160 °C. The N2 selectivity of higher than 99.8% is obtained over the Ce(1)Mn/ACH catalyst at 80–200 °C. Results indicate that the addition of CeO2 improves the distribution of MnOx and enhances the oxidation of NO to NO2, producing more absorbed NO3– on the catalyst surface, which is then reduced into N2 by NH3. These behaviors account for the promoting effect of CeO2 on the SCR activity.

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Contributors

Author: Zheng Jiang

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