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应用Tian-Calvet热流量热仪与脉冲微反系统相结合的脉冲量热装置研究了Ir-in-CeO2(Ir主要包裹在CeO2里)催化剂上CO氧化过程表面碳酸盐的形成及其转化.结果表明,碳酸盐的吸附强度与CeO2表面价态直接相关.在反应中首先形成约0.07个单层覆盖度的不可逆吸附碳酸盐,随后形成约0.02个单层覆盖度的可逆吸附碳酸盐并随着Ce3+转变为Ce4+而分解.
The formation and transformation of carbonate on the surface of CO oxidation process of Ir-in-CeO2 (Ir mainly encapsulated in CeO2) catalyst was investigated by using the pulse calorimeter combined with Tian-Calvet heat flow calorimeter and pulsed micro-reverse system. The results show that the adsorption strength of carbonate is directly related to the surface valence state of CeO2, in which about 0.07 irreversibly adsorbed carbonates with a single-layer coverage are first formed, followed by the formation of about 0.02 monolayer reversible adsorption carbonates Salt and with Ce3 + into Ce4 + decomposition.