Comparative study of CO2 hydrogenation to methanol on cubic bixbyite-type and rhombohedral corundum-type indium oxide
Comparative study of CO2 hydrogenation to methanol on cubic bixbyite-type and rhombohedral corundum-type indium oxide
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立方方铁锰矿型和菱方刚玉型氧化铟CO2加氢制甲醇的对比研究
DOI：
10.1016/j.cclet.2020.05.031
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发表时间：
2020-05
影响因子：
9.1
通讯作者：
Guo Limin
中科院分区：
文献类型：
--
作者：
Yang Bin;Li Longtai;Jia Ziye;Liu Xiping;Zhang Chunjie;Guo Limin
二氧化碳加氢制附加值化学品在世界范围内备受关注。具有立方双水铝石结构的In_2O_3(记为c-In_2O_3)在高温下具有较高的CO_2加氢活性和CH_3OH选择性。然而，菱方刚玉型In_2O_3的另一种结构(记为rh-In_2O_3)作为催化剂的研究很少。本文制备了c-In_2O_3和Rh-In_2O_3两种催化剂，并对它们的CO_2加氢性能进行了比较研究。结果表明，c-In_2O_3催化剂的还原性能和反应活性明显高于Rh-In_2O_3催化剂的CO_2转化活性。而Rh-In_2O_3由于CH3OH较弱，CO在Rh-In_2O_3上的吸附较强，具有较高的CH_3OH选择性。尽管c-In_2O_3和Rh-In_2O_3催化剂表现出不同的CO加氢性能，但原位漫反射红外傅里叶变换光谱表明，CO_2可以通过氧化还原循环和甲酸盐路径加氢生成CH_3OH而还原为CO。
Hydrogenation of CO2to value-added chemicals has attracted much attention all through the world. In2O3with cubic bixbyite-type (denoted as c-In2O3) is well known for its high CO2hydrogenation activity and CH3OH selectivity at high temperature. However, the other structure of In2O3with rhombohedral corundum-type (denoted as rh-In2O3) rarely been investigated as catalyst. Herein, c-In2O3and rh-In2O3were prepared and comparatively studied for CO2hydrogenation. The results indicated that c-In2O3showed higher CO2conversion activity than rh-In2O3due to the impressive reducibility and reactivity. Whereas rh-In2O3had higher CH3OH selectivity due to weaker CH3OH and stronger CO adsorption on rh-In2O3. Although c-In2O3and rh-In2O3catalysts showed different CO2hydrogenation performance,in-situdiffuse reflectance infrared Fourier transform spectroscopy showed CO2can be reduced to CO through redox cycling and hydrogenation to CH3OH through formate path.
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