CeO2/Beta composite catalysts in dimethyl carbonate synthesis from CO2: effect of preparation method on surface oxygen species

被引:0
作者
Wang, Fei [1 ]
Da, Biao [1 ]
Wan, Tiantian [1 ]
Zhang, Yue [1 ]
Liu, Na [1 ]
Ma, Qingxiang [2 ]
Xu, Jie [1 ]
Xue, Bing [1 ]
Wei, Xuejiao [3 ]
机构
[1] Changzhou Univ, Adv Catalysis & Green Mfg Collaborat Innovat Ctr, Sch Petrochem & Engn, Jiangsu Prov Key Lab Fine Petrochem Engn, Changzhou 213164, Peoples R China
[2] Ningxia Univ, Coll Chem & Chem Engn, State Key Lab High Efficiency Coal Utilizat & Gree, Yinchuan 750021, Peoples R China
[3] Changzhou Inst Technol, Sch Chem Engn & Mat, Changzhou 213164, Peoples R China
基金
中国国家自然科学基金;
关键词
CeO2/Beta composite; Preparation method; Dimethyl carbonate; CO2; Surface properties; METHANOL; DIOXIDE; DIMETHYLCARBONATE; NANOCRYSTALS; CONVERSION; VACANCIES;
D O I
10.1007/s11144-024-02755-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two kinds of CeO2/Beta composite catalysts were prepared by precipitation method (CeB-p) and hydrothermal method (CeB-h), respectively. The physicochemical properties of all samples were studied in detail by combining XRD, XPS, SEM, TEM, N-2 sorption, NH3-TPD and CO2-TPD techniques. CeB-p catalyst exhibited a higher dimethyl carbonate (DMC) yield than the CeB-h catalyst at the similar conditions for DMC synthesis from CO2 and methanol. This enhanced activity of CeB-p catalyst was attributed to enhanced acid-base properties modulated by abundant surface lattice oxygen species rather than oxygen vacancies. Compared with the inertly adsorbed methoxy induced by the oxygen vacancy enriched CeB-h, abundant surface lattices oxygen species in CeB-p catalyst facilitated the formation of weakly absorbed methoxy species, which resulted in the shift of the rate-determining step and the reduction of reaction energy barrier. This study offered guidance for the rational design and fabrication of high-performance DMC synthesis catalysts based on CeO2/Beta composite.
引用
收藏
页码:845 / 858
页数:14
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