Facile surface improvement method for LaCoO3 for toluene oxidation
Facile surface improvement method for LaCoO3 for toluene oxidation
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用于甲苯氧化的 LaCoO3 的简便表面改进方法
DOI：
10.1039/c8cy00765a
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发表时间：
2018-06
影响因子：
5
通讯作者：
Li Junhua
中科院分区：
文献类型：
--
作者：
Yang Qilei;Wang Dong;Wang Chizhong;Li Xianfeng;Li Kezhi;Peng Yue;Li Junhua
合理设计低成本、高活性、高选择性的过渡金属催化剂可能是多相催化领域最重要的研究方向。此前有报道称，使用酸性溶液的选择性溶解方法可以调整催化剂表面。本工作采用传统的柠檬酸盐溶胶-凝胶法合成了LaCoO_3(LCO-0)钙钛矿催化剂用于甲苯氧化。经醋酸处理的LaCoO_3催化剂(LCO-1)的催化活性显著提高：在每小时空速为60 000mLg−1h−-1的条件下，LCO-1的T90为223℃，比未处理的LCO-0降低了40℃。此外，LCO-1在500℃焙烧后仍表现出良好的稳定性。催化剂的高性能主要与其还原性能、表面氧空位和比表面积的改善有关。这种高的稳定性是由于经醋酸处理后的钙钛矿结构得以保留。
The rational design of low-cost transition metal catalysts that exhibit high activity and selectivity may be the most significant area of investigation in heterogeneous catalysis. A selective dissolution method using acid solutions was previously reported to tune catalyst surfaces. In this work, LaCoO3 (LCO-0) perovskite catalysts were synthesized by the traditional citrate sol–gel method for toluene oxidation. The catalytic activity of the LaCoO3 treated with acetic acid (LCO-1) was significantly increased: the T90 of LCO-1 was 223 °C, which was 40 °C lower than that of the untreated catalyst (LCO-0) under a weight hourly space velocity (WHSV) of 60 000 mL g−1 h−1. The exposed A-site cations of perovskite were slightly etched, but still preserved the original framework according to XRD, TEM, SEM and ICP results. Moreover, LCO-1 exhibited excellent stability even after 500 °C calcination. The high catalytic performance was mainly associated with improvements in reducibility, surface oxygen vacancies and surface area. The high stability was due to the preservation of the perovskite structure after acetic acid treatment.
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影响因子：
2.8
作者：
Guojun Zou;Longxin Chen;Xiaolai Wang
通讯作者：
Guojun Zou;Longxin Chen;Xiaolai Wang
影响因子：
22.1
作者：
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通讯作者：
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影响因子：
22.1
作者：
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通讯作者：
Li, Junhua
影响因子：
32.5
作者：
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通讯作者：
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影响因子：
22.1
作者：
Wang, Yafei;Zhang, Changbin;He, Hong
通讯作者：
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