CAJ | 학술논문

利用乙二醇的还原性，采用乙二醇溶剂热法制备了表面具有丰富氧空穴的CeO2-GST纳米晶，对其进行了X射线衍射、透射电镜、X射线光电子能谱、原位H2还原-O2氧化循环和CO2原位红外漫反射表征，并研究了其可逆氧化还原性及CO2捕获性能。结果表明，与CeO2-nanorod和柠檬酸溶胶法合成的CeO2-CA样品相比， CeO2-GST纳米晶具有最好的可逆氧化还原性能和循环稳定性，同时在50 oC下具有最好的CO2吸附性能(149μmol/g)。利用原位红外漫反射光谱研究了CO2在还原CeO2表面的吸附情况，发现CO2主要以双齿碳酸盐和桥连碳酸盐两种形式吸附在CeO2表面，其中桥连碳酸盐物种不稳定， He吹扫可脱附。此外， CO2在CeO2-nanorod上还会生成稳定的甲酸盐和单齿碳酸盐物种。
이용을이순적환원성，채용을이순용제열법제비료표면구유봉부양공혈적CeO2-GST납미정，대기진행료X사선연사、투사전경、X사선광전자능보、원위H2환원-O2양화순배화CO2원위홍외만반사표정，병연구료기가역양화환원성급CO2포획성능。결과표명，여CeO2-nanorod화저몽산용효법합성적CeO2-CA양품상비， CeO2-GST납미정구유최호적가역양화환원성능화순배은정성，동시재50 oC하구유최호적CO2흡부성능(149μmol/g)。이용원위홍외만반사광보연구료CO2재환원CeO2표면적흡부정황，발현CO2주요이쌍치탄산염화교련탄산염량충형식흡부재CeO2표면，기중교련탄산염물충불은정， He취소가탈부。차외， CO2재CeO2-nanorod상환회생성은정적갑산염화단치탄산염물충。
CeO2 nanocrystals with plentiful oxygen vacancies were synthesized by a glycol solvothermal method (CeO2-GST) using the strong reducibility of glycol. For comparison, CeO2 nanorods (CeO2-nanorods) and CeO2 nanoparticles (CeO2-CA) were also prepared. The samples were charac-terized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, H2 reduction-O2 oxidation cycle experiments and in situ CO2 infrared spectroscopy. The CeO2-GST sample exposed mainly (111) facets with abundant Ce3+ions on its surface, and it gave excellent reversible redox behavior and high oxygen storage capacity. After seven H2 reduction-O2 oxidation cycles, the oxygen storage capacity became stable. The CeO2-GST sample also had a high CO2 ad-sorption capacity of 149μmol/g at 50 °C by forming bidentate and bridge carbonates on the CeO2 surface. These carbonate species were less stable than the unidentate carbonate, bicarbonate and formate species, thus adsorbed CO2 was released easily. On reduced CeO2 nanorod, CO2 formed the stable unidentate carbonate and formate species, which is unfavorable for the release of adsorbed CO2.