Tuning of Catalytic Activity by Thermoelectric Materials for Carbon Dioxide Hydrogenation
Tuning of Catalytic Activity by Thermoelectric Materials for Carbon Dioxide Hydrogenation
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DOI：
10.1002/aenm.201701430
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发表时间：
2018-02-15
影响因子：
27.8
通讯作者：
Huang, Zhaorong
中科院分区：
文献类型：
--
作者：
Achour, Abdenour;Chen, Kan;Huang, Zhaorong
本文报道了热电材料BiCuSeO作为CO2加氢催化剂载体和促进剂的创新应用。提出热电材料移动催化剂的费米能级和功函数的能力导致沉积在其表面上的催化剂颗粒的催化活性呈指数增加。实验结果表明，热电塞贝克电压的CO2转化率和CO选择性显着增加。这表明热电效应不仅可以提高反应速率，而且可以改变化学平衡，从而改变CO2加氢反应的热力学平衡。它还表明，这种热电促进催化剂使BiCuSeO氧化物本身具有高的催化活性的CO2加氢。该机制的一般性质表明，许多催化化学反应可以原位调节以实现更高的反应速率，或在更低的温度下，或通过改变热电载体的背面温度具有更好的所需选择性。
An innovative use of a thermoelectric material (BiCuSeO) as a support and promoter of catalysis for CO2 hydrogenation is reported here. It is proposed that the capability of thermoelectric materials to shift the Fermi level and work function of a catalyst lead to an exponential increase of catalytic activity for catalyst particles deposited on its surface. Experimental results show that the CO2 conversion and CO selectivity are increased significantly by a thermoelectric Seebeck voltage. This suggests that the thermoelectric effect can not only increase the reaction rate but also change chemical equilibrium, which leads to the change of thermodynamic equilibrium for the conversion of CO2 in its hydrogenation reactions. It is also shown that this thermoelectric promotion of catalysis enables BiCuSeO oxide itself to have a high catalytic activity for CO2 hydrogenation. The generic nature of the mechanism suggests the possibility that many catalytic chemical reactions can be tuned in situ to achieve much higher reaction rates, or at lower temperatures, or have better desired selectivity through changing the backside temperature of the thermoelectric support.