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太阳能驱动二氧化碳(CO_2)转化为燃料是解决CO_2减排和快速增长的世界能源需求的理想方案。本文利用光照辐射镍基负载催化剂床层引发加热效应以促进CO_2的转化,研究了不同组成的氧化铈-氧化钛复合氧化物载体及其对光热CO_2转化的影响。提高光热CO_2甲烷化活性的两个至关重要的因素分别是:(1)优化的镍颗粒负载对于高活性催化面积及用于加热催化床层的更高的光吸收能力是必需的;(2)载体上的缺陷位对于促进CO_2吸附及随后的活化是必需的。载体中的钛对维持掺杂氧化钛的氧化铈上的氧空位缺陷起着关键作用。当氧化铈和氧化钛混合比例理想时,再结合高光照吸收以及稳定的还原状态,有利于CO_2吸附及随后高效光热CO_2甲烷化反应的发生。
Solar-driven conversion of carbon dioxide (CO 2) to fuel is the ideal solution to the world’s energy needs for CO 2 reduction and rapid growth. In this paper, the heating effect was induced by the bed of Ni-based supported catalyst under irradiation of light to promote the conversion of CO 2. The effects of different composition of cerium oxide-titanium oxide composite oxide support on the conversion of CO 2 were studied. Two crucial factors that increase photothermal CO 2 methanation activity are: (1) optimized nickel particle loading is necessary for higher active catalytic area and higher light absorption capacity for heating the catalytic bed; ( 2) Defective sites on the support are necessary to promote CO 2 adsorption and subsequent activation. The titanium in the support plays a key role in maintaining oxygen vacancy defects on the ceria doped with titanium oxide. When the mixing ratio of cerium oxide and titanium oxide is ideal, combined with high light absorption and stable reduction state, it is favorable for CO 2 adsorption and subsequent high photothermal CO 2 methanation reaction.