Ordered Mesoporous CeO2‐supported Ag as an Effective Catalyst for Carboxylative Coupling Reaction Using CO2. Issue 8 (3rd April 2019)

• Record Type: Journal Article
• Authors: Zhang, Xiao; Wang, Dingkun; Jing, Meizan; Liu, Jian; Zhao, Zhen; Xu, Guanhua; Song, Weiyu; Wei, Yuechang; Sun, Yuanqing
• Is Part Of: ChemCatChem. Volume 11:Issue 8(2019)
• Page Start: 2089
• Page End: 2098
• Publication Date: 2019-04-03
• Subjects: CO2 -- Carboxylative coupling -- Ag nanoparticles -- Mesoporous CeO2 -- Oxygen vacancies; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201900039
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Ag/Mesoporous CeO2 (Ag/M−CeO2 ) catalysts were synthesized through the gas bubbling‐assisted membrane reduction (GBMR) method and characterized by XRD, ICP‐OES, N2 adsorption‐desorption, XPS, Raman spectroscopy, TEM, HRTEM, HAADF‐STEM and CO2 ‐TPD. Ag/M−CeO2 catalysts contain uniform mesoporous structure, large surface area and oxygen vacancies, which promote the dispersion of Ag nanoparticles. Density functional theory (DFT) calculations indicate that Ag nanoparticles supported on M−CeO2 could facilitate the formation of oxygen vacancies, which result in higher CO2 adsorption capacity. With the most oxygen vacancies and the well‐dispersed Ag active species, Ag (3.12 %)/M−CeO2 exhibits high efficiency for the carboxylative coupling of terminal alkynes, chloride compounds and CO2 under mild reaction conditions (60 °C, 0.5 MPa), affording a wide range of functionalized 2‐alkynoates in good yields. Abstract : It's all about the vacancies : Ag/M−CeO2 were synthesized through the gas bubbling‐assisted membrane reduction (GBMR) method. Density functional theory (DFT) calculations indicate that Ag nanoparticles on M−CeO2 facilitate the formation of oxygen vacancies, which contribute to CO2 adsorption. Ag/M−CeO2 show excellent performance for carboxylative coupling reaction using CO2, affording a wide range of functionalized 2‐alkynoates in good yields.