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Environ Sci Technol

Title:		Chlorine-Coordinated Pd Single Atom Enhanced the Chlorine Resistance for Volatile Organic Compound Degradation: Mechanism Study
Author(s):		Bi F; Zhao Z; Yang Y; Gao W; Liu N; Huang Y; Zhang X;
Address:		"School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China"
Journal Title:		Environ Sci Technol
Year:		2022
Volume:		20221104
Issue:		23
Page Number:		17321 - 17330
DOI:		10.1021/acs.est.2c06886
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"The development of catalysts with high chlorine resistance for volatile organic compound (VOC) degradation is of great significance to achieve air purification. Herein, Pd@ZrO(2) catalysts with monodispersed Pd atoms coordinated with Cl were prepared using an in situ grown Zr-based metal-organic framework (MOF) as the sacrifice templates to enhance the chlorine resistance for VOC elimination. The residual Cl species from the Zr-MOF coordinated with Pd, forming Pd(1)-Cl species during the pyrolysis. Meanwhile, abundant oxygen vacancies (V(O)) were generated, which enhanced the adsorption and activation of gaseous oxygen molecules, accelerating the degradation of VOCs. In addition, the Pd@ZrO(2) catalysts exhibited satisfactory water resistance, long-term stability, and great resistance to CO and dichloromethane (DCM) for VOC elimination. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) results elucidated that the generation of Pd(1)-Cl species in Pd@ZrO(2) suppressed the absorption of DCM, releasing more active sites for toluene and its intermediate adsorption. Simultaneously, the monodispersed Pd atoms and V(O) improved the reactivity of gaseous oxygen molecule adsorption and dissociation, boosting the deep decomposition of toluene and its intermediates. This work may provide a new strategy for rationally designing high-chlorine resistance catalysts for VOC elimination to improve the atmospheric environment"
Keywords:		Pd1-Cl species VOC oxidation catalytic degradation chlorine resistance degradation mechanism;
Notes:		"PubMed-not-MEDLINEBi, Fukun Zhao, Zhenyuan Yang, Yang Gao, Weikang Liu, Ning Huang, Yuandong Zhang, Xiaodong eng 2022/11/05 Environ Sci Technol. 2022 Dec 6; 56(23):17321-17330. doi: 10.1021/acs.est.2c06886. Epub 2022 Nov 4"