Hydrodechlorination of trifluoro-trichloroethane to chlorotrifluoroethylene: Revealing the deactivation mechanism and regeneration strategy of Pd-Cu/AC catalyst

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外文摘要：Chlorotrifluoroethylene (CTFE) is a vital fluorinated olefinic monomer produced through the catalytic hydrodechlorination of trichlorotrifluoroethane (CFC-113), an eco-friendly process. However, hydro-dechlorination catalysts for olefin production often suffer from poor stability. The Pd/AC catalyst and Pd-Cu/AC catalyst prepared by co-impregnation method exhibited poor stability, Pd-Cu/AC catalyst with CFC-113 conversion dropping to around 37％ after 50 h of hydrodechlorination reaction. Brunauer-Emmett-Teller, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffrac-tion of fresh and deactivated Pd/AC catalysts indicate that the deactivation of Pd/AC catalysts is due to high-temperature agglomeration of Pd. Comparative analysis of fresh and deactivated Pd-Cu/AC cata-lysts using Brunauer-Emmett-Teller, transmission electron microscopy, and thermogravimetric analysis techniques revealed decreased dispersion of active sites, reduced surface area, catalyst aggregation deactivation, and a significant decrease in Cu content. Furthermore, the results of NH3-TPD revealed that the acid sites of the catalyst increased significantly. X-ray diffraction spectra indicated the formation of new species, basic copper chloride (Cu2(OH)3Cl), during the reaction. As the reaction progressed, these new species agglomerated, leading to a gradual loss of catalyst activity. Moreover, the deactivated catalyst was successfully reactivated using a simple alkaline washing method.

外文关键词：

CFC-113HydrodechlorinationChlorotrifluoroethyleneCatalyst deactivation

作者：

Song Tian、Yicheng Chen、Xiaoyu Wen、Bingcheng Li、Jian Lu、Zile Li、Feng Feng、Qingtao Wang、Qunfeng Zhang、Xiaonian Li

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作者单位：

State Key Laboratory of Fluorine &Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Institute of Industrial Catalysis of Zhejiang University of Technology, Hangzhou 310014, China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Basic Research Planning Shaanxi Province of ChinaKey Research and Development Project of Shaanxi ProvinceChina Postdoctoral Science FoundationOpen cooperative innovation fund of Xi'an Institute of modern chemistry

项目编号：

2200821222078292219021242017ZDJC-292018ZDXM-GY-1732019 M663848SYJJ48

出版年：

2024

DOI：

10.1016/j.cjche.2024.02.006

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

年,卷(期)：2024.70(6)

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