Significant enhancement in water resistance of Pd/Al_2O_3 catalyst for benzene oxidation by Na addition

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英文篇名：Significant enhancement in water resistance of Pd/Al_2O_3 catalyst for benzene oxidation by Na addition 作者：Shunyu ; Kang ; Meng ; Wang ; Na ; Zhu ; Chunying ; Wang ; Hua ; Deng ; Hong ; He 英文作者：Shunyu Kang;Meng Wang;Na Zhu;Chunying Wang;Hua Deng;Hong He;Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences; 英文关键词：Sodium addition;;Pd/Al_2O_3;;Benzene;;Water resistance;;Catalytic oxidation 中文刊名：FXKB 英文刊名：中国化学快报(英文版) 机构：Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences; 出版日期：2019-07-15 出版单位：Chinese Chemical Letters 年：2019 期：v.30 基金：supported by the National Natural Science Foundation of China (No. 51608504);; Youth Innovation Promotion Association;; Chinese Academy of Sciences(No. 2017064) 语种：英文; 页：FXKB201907022 页数：5 CN：07 ISSN：11-2710/O6 分类号：108-112

摘要

A series of Na-doped 1 wt% Pd/Al_2 O_3 catalysts with different Na loadings were prepared by wet imp regnation and tested for the catalytic oxidation of benzene.Suitable addition of Na had a remarkable promotion effect on water resistance and enhancement of low tempe rature activity of Pd/Al_2 O_3 catalysts.The optimal mole ratio between Na and Pd was 1:1.The properties of the prepared catalysts were characterized by X-ray diffraction(XRD),Brunauer Emmett Teller(BET),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),O_2-temperature-programmed desorption(O_2-TPD),and in situ DRIFTS.Results indicated that the addition of Na not only decreased the content of adsorbed water species but also increased the amount of liable surface oxygen species,which are likely the key factors for the excellent water resistance of the catalyst Na addition also imp roved the mobility of the lattice oxygen species,which was favorable for catalytic activity.Moreover,the well-dispersed negatively charged Pd particles and suitable redox properties derived from Na addition also contributed to the improved performance and water resistance of the Na_1 Pd_1/Al_2 O_3 catalyst.In situ DRIFTS results revealed that benzene was oxidized to maleate and acetate species via intermediate o-benzoquinone species,which finally turned into harmless CO_2 and H_2 O.
        A series of Na-doped 1 wt% Pd/Al_2 O_3 catalysts with different Na loadings were prepared by wet imp regnation and tested for the catalytic oxidation of benzene.Suitable addition of Na had a remarkable promotion effect on water resistance and enhancement of low tempe rature activity of Pd/Al_2 O_3 catalysts.The optimal mole ratio between Na and Pd was 1:1.The properties of the prepared catalysts were characterized by X-ray diffraction(XRD),Brunauer Emmett Teller(BET),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),O_2-temperature-programmed desorption(O_2-TPD),and in situ DRIFTS.Results indicated that the addition of Na not only decreased the content of adsorbed water species but also increased the amount of liable surface oxygen species,which are likely the key factors for the excellent water resistance of the catalyst Na addition also imp roved the mobility of the lattice oxygen species,which was favorable for catalytic activity.Moreover,the well-dispersed negatively charged Pd particles and suitable redox properties derived from Na addition also contributed to the improved performance and water resistance of the Na_1 Pd_1/Al_2 O_3 catalyst.In situ DRIFTS results revealed that benzene was oxidized to maleate and acetate species via intermediate o-benzoquinone species,which finally turned into harmless CO_2 and H_2 O.

引文

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