Deactivation effects of Pb(II) and sulfur dioxide on a γ-MnO2 catalyst for combustion of chlorobenzene

Pengfei Sun; Yu Long; Yunpeng Long; Shuang Cao; Xiaole Weng; Zhongbiao Wu

doi:10.1016/j.jcis.2019.09.059

Deactivation effects of Pb(II) and sulfur dioxide on a γ-MnO₂ catalyst for combustion of chlorobenzene

J Colloid Interface Sci. 2020 Feb 1:559:96-104. doi: 10.1016/j.jcis.2019.09.059. Epub 2019 Sep 18.

Authors

Pengfei Sun¹, Yu Long², Yunpeng Long², Shuang Cao³, Xiaole Weng¹, Zhongbiao Wu⁴

Affiliations

¹ Department of Environmental Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Centre of Industrial Boiler & Furnace Flue Gas Pollution Control, 388 Yuhangtang Road, 310058 Hangzhou, PR China.
² Department of Environmental Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China.
³ Department of Environmental Engineering, China Jiliang University, Hangzhou 310018, PR China.
⁴ Department of Environmental Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Centre of Industrial Boiler & Furnace Flue Gas Pollution Control, 388 Yuhangtang Road, 310058 Hangzhou, PR China. Electronic address: zbwu@zju.edu.cn.

PMID: 31622818
DOI: 10.1016/j.jcis.2019.09.059

Abstract

Mn-based catalysts are extensively used; herein, the poisoning mechanism of Pb²⁺ and SO₂ on the γ-MnO₂ catalyst during the combustion of chlorobenzene (CB) was studied. The oxidizability/reducibility, surface acidity and water activation property of the Pb/SO₄^2- modified γ-MnO₂ were analyzed by using XPS, H₂-TPR/O₂-TPD, NH₃-TPD/Pyridine-IR and H₂O-TPD. Catalytic performance and byproduct selectivity towards CB combustion were explored, indicating that Pb²⁺ and SO₂ both impacted CB conversion and CO₂ selectivity as indicated by the loss of oxidation properties and surface acidity. Analysis of the byproducts showed that Pb²⁺ and SO₂ induced the formation of more toxic polychlorinated byproducts, thereby introducing new secondary environmental pollution risks.

Keywords: Byproducts; Chlorobenzene combustion; Pb(2+); Poisoning mechanism; SO(2).