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A CeCoOx Core/Nb2O5@TiO2 Double-Shell Nanocage Catalyst Demonstrates High Activity and Water Resistance for Catalytic Combustion of o-Dichlorobenzene
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2021-05-14 , DOI: 10.1002/chem.202100392 Weitong Ling 1, 2 , Haijun Zhao 1 , Shilin Wu 1 , Zhicheng Tang 1 , Fei Zha 2
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2021-05-14 , DOI: 10.1002/chem.202100392 Weitong Ling 1, 2 , Haijun Zhao 1 , Shilin Wu 1 , Zhicheng Tang 1 , Fei Zha 2
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A series of catalysts with different core-shell structures has been successfully prepared by a hydrothermal method. They consisted of CeCoOx@TiO2 (single shell), CeCoOx@Nb2O5 (single shell) and CeCoOx@Nb2O5@TiO2 (double shell) core-shell nanocages and CeCoOx nanocages, in which CeCoOx was the core and TiO2 and Nb2O5 were shells. The influence of the core-shell structure on the catalytic performance of o-dichlorobenzene was investigated by activity, water-resistance, and thermal stability tests as well as catalyst characterization. The temperatures corresponding to 90 % conversion of o-dichlorobenzene (T90) of CeCoOx, CeCoOx@TiO2, CeCoOx@Nb2O5, and CeCoOx@Nb2O5@TiO2 catalysts were 415, 383, 362 and 367 °C, respectively. CeCoOx@Nb2O5 exhibited excellent catalytic activity, mainly owing to the special core-shell structure, large specific surface area, abundant activity of Co3+, Ce3+, Nb5+, strong reducibility, and more active oxygen vacancies. It can be seen that the Nb2O5 coating can greatly improve the catalytic activity of the catalyst. In addition, due to the protective effect of the TiO2 shell on CeCoOx, CeCoOx@Nb2O5@TiO2 catalysts exhibited outstanding thermal and hydrothermal stability for 20 hours. The T90 of CeCoOx@Nb2O5@TiO2 was slightly lower than that of CeCoOx@Nb2O5, but it had higher stability and hydrothermal stability. Furthermore, possible reaction pathways involving the Mars-van-Krevelen (MvK) and Langmuir-Hinshelwood (L−H) models were deduced based on studies of the temperature-programmed desorption of O2 (O2-TPD), X-ray photoelectron spectroscopy (XPS), and in situ diffuse reflectance FTIR spectroscopy (DRIFTS) characterization.
中文翻译：
CeCoOx 核/Nb2O5@TiO2 双壳纳米笼催化剂在邻二氯苯催化燃烧中表现出高活性和耐水性
采用水热法成功制备了一系列不同核壳结构的催化剂。它们由 CeCoO x @TiO 2（单壳）、CeCoO x @Nb 2 O 5（单壳）和 CeCoO x @Nb 2 O 5 @TiO 2（双壳）核壳纳米笼和 CeCoO x纳米笼组成，其中CeCoO x是核，TiO 2和Nb 2 O 5是壳。核壳结构对o催化性能的影响-二氯苯通过活性、耐水性和热稳定性测试以及催化剂表征进行研究。对应于CeCoO x、CeCoO x @TiO 2、CeCoO x @Nb 2 O 5和 CeCoO x @Nb 2 O 5 @TiO 2催化剂的邻二氯苯 ( T 90 ) 90% 转化率的温度为 415、383 、分别为 362 和 367 °C。CeCoO x @Nb 2 O 5表现出优异的催化活性，主要是由于特殊的核壳结构、大的比表面积、丰富的Co 3+、Ce 3+、Nb 5+活性、强还原性和更多的活性氧空位。可见，Nb 2 O 5涂层可以大大提高催化剂的催化活性。此外，由于TiO 2壳层对CeCoO x的保护作用，CeCoO x @Nb 2 O 5 @TiO 2催化剂在20小时内表现出优异的热稳定性和水热稳定性。CeCoO x的T 90@Nb 2 O 5 @TiO 2略低于CeCoO x @Nb 2 O 5，但具有更高的稳定性和水热稳定性。此外，基于对 O 2 (O 2 -TPD)、X 射线光电子的程序升温脱附的研究，推导出了涉及 Mars-van-Krevelen (MvK) 和 Langmuir-Hinshelwood (L-H) 模型的可能反应途径。光谱 (XPS) 和原位漫反射 FTIR 光谱 (DRIFTS) 表征。
更新日期：2021-07-16
中文翻译：
CeCoOx 核/Nb2O5@TiO2 双壳纳米笼催化剂在邻二氯苯催化燃烧中表现出高活性和耐水性
采用水热法成功制备了一系列不同核壳结构的催化剂。它们由 CeCoO x @TiO 2（单壳）、CeCoO x @Nb 2 O 5（单壳）和 CeCoO x @Nb 2 O 5 @TiO 2（双壳）核壳纳米笼和 CeCoO x纳米笼组成，其中CeCoO x是核，TiO 2和Nb 2 O 5是壳。核壳结构对o催化性能的影响-二氯苯通过活性、耐水性和热稳定性测试以及催化剂表征进行研究。对应于CeCoO x、CeCoO x @TiO 2、CeCoO x @Nb 2 O 5和 CeCoO x @Nb 2 O 5 @TiO 2催化剂的邻二氯苯 ( T 90 ) 90% 转化率的温度为 415、383 、分别为 362 和 367 °C。CeCoO x @Nb 2 O 5表现出优异的催化活性，主要是由于特殊的核壳结构、大的比表面积、丰富的Co 3+、Ce 3+、Nb 5+活性、强还原性和更多的活性氧空位。可见，Nb 2 O 5涂层可以大大提高催化剂的催化活性。此外，由于TiO 2壳层对CeCoO x的保护作用，CeCoO x @Nb 2 O 5 @TiO 2催化剂在20小时内表现出优异的热稳定性和水热稳定性。CeCoO x的T 90@Nb 2 O 5 @TiO 2略低于CeCoO x @Nb 2 O 5，但具有更高的稳定性和水热稳定性。此外，基于对 O 2 (O 2 -TPD)、X 射线光电子的程序升温脱附的研究，推导出了涉及 Mars-van-Krevelen (MvK) 和 Langmuir-Hinshelwood (L-H) 模型的可能反应途径。光谱 (XPS) 和原位漫反射 FTIR 光谱 (DRIFTS) 表征。
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