Effect of support structure of Pt/silicaite-1 catalyst on non-thermal plasma (NTP) assisted chlorobenzene degradation and PCDD/Fs formation.

Autor: Mu Y; School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK., Jiao Y; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, 110016, China., Wang X; Department of Chemical Engineering, The University of Manchester, Manchester, M13 9PL, UK., Williams PT; School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK. Electronic address: p.t.williams@leeds.ac.uk.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Jul; Vol. 359, pp. 142294. Date of Electronic Publication: 2024 May 09.
DOI: 10.1016/j.chemosphere.2024.142294
Abstrakt: Development of efficient catalysts for non-thermal plasma (NTP) assisted catalysis to mitigate the formation of harmful by-products is a significant challenge in the degradation of chlorinated volatile organic compounds (Cl-VOCs). In this study, catalytically active Pt nanoparticles supported on non-porous SiO2 and silicalite-1 zeolites (S1) with different pore structure were comparatively investigated for catalytic chlorobenzene degradation under NTP condition. It was shown that the pore structure could significantly impact the metal size and metal dispersion rate. Pt supported on modified S1 hierarchical meso-micro-porous silicalite-1 (Pt/D-S1) exhibited the smallest particle size (∼6.19 nm) and the highest dispersion rate (∼1.87). Additionally, Pt/D-S1 demonstrated superior catalytic performance compared to the other catalysts, achieving the highest chlorobenzene conversion and COx selectivity at about 80% and 75%, respectively. Furthermore, the pore structure also affected the formation of by-products according to the findings from GC-MS analysis. Pt/SiO 2 generated a total of 18 different species of organic compounds, whereas only 12 species of organic by-products were identified in the Pt/D-S1 system (e.g. polychlorinated compounds like 3,4 dichlorophenol were exclusively identified in Pt/SiO 2 ). Moreover, dioxin-like polychlorinated biphenyl and other chlorinated organic compounds, which have potential to form highly toxic dioxins, were detected in the catalysts. HRGC-HRMS confirmed and quantified the 17 different dioxin/furans formed on Pt/SiO 2 (25,100 ng TEQ kg -1 ), Pt/S1 (515 ng TEQ kg -1 ) and Pt/D-S1 (367 ng TEQ kg -1 ). The correlation between synthesis-structure-performance in this study provides insights into the design of catalysts for deep oxidation of Cl-VOCs in NTP system.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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