Effects of sulfur poisoning on physicochemical properties and performance of MnO2/AlNi-PILC for toluene catalytic combustion

Zhuo Wang; Kaiyuan Xie; Baishun Jiang; Shufeng Zuo; Qiuyan Wang

doi:10.1016/j.jhazmat.2022.128950

Effects of sulfur poisoning on physicochemical properties and performance of MnO₂/AlNi-PILC for toluene catalytic combustion

J Hazard Mater. 2022 Aug 5:435:128950. doi: 10.1016/j.jhazmat.2022.128950. Epub 2022 Apr 20.

Authors

Zhuo Wang¹, Kaiyuan Xie¹, Baishun Jiang¹, Shufeng Zuo², Qiuyan Wang³

Affiliations

¹ Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
² Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China. Electronic address: sfzuo@usx.edu.cn.
³ State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China. Electronic address: qywang@nankai.edu.cn.

PMID: 35468397
DOI: 10.1016/j.jhazmat.2022.128950

Abstract

AlNi pillared clay (AlNi-PILC) was synthesized firstly, and then MnO₂ was supported via wetness impregnation from nitrate precursors. Sulphation was performed by in-situ decomposing ammonium sulfate with different concentrations over MnO₂/AlNi-PILC. Catalysts before and after sulfur poisoning were characterized by XRD, N₂ adsorption/desorption, HRTEM, XPS, H₂-TPR and NH₃-TPD. MnO₂/AlNi-PILC exhibited high catalytic activity, allowing the complete toluene combustion. Structure of the catalyst was obviously damaged after sulfur poisoning. (001) crystal plane strength of AlNi-PILC was decreased significantly. Meanwhile, the specific surface area and pore volume reduced with increase of sulfate concentration. Sulfur species were readily formed on the surface of poisoned catalyst and deposited in the pore structure of AlNi-PILC, which resulted in significant impacts on the structural stability, acidity and the number of active species. These changes were responsible for the decreased catalytic performance.

Keywords: In-situ sulfur poisoning; MnO(2)/AlNi-PILC; Structural changes; Toluene catalytic combustion.