DOI: 10.1016/j.jcou.2018.07.009
Scopus记录号: 2-s2.0-85050293553
论文题名: Organic-inorganic multifunctional hybrid catalyst giving catalytic synergies in cooperative coupling between CO2 and propylene oxide to propylene carbonate
作者: Kim D. ; Na K.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 27 起始页码: 129
结束页码: 136
语种: 英语
英文关键词: Carbon dioxide
; Hybrid catalyst
; Mesoporous zeolite
; Propylene carbonate
; Propylene oxide
Scopus关键词: Activation energy
; Carbon dioxide
; Carbonation
; Catalysis
; Catalysts
; Mergers and acquisitions
; Mesoporous materials
; Propylene
; Silica
; Zeolites
; Cooperative coupling
; Hybrid catalysts
; Mesoporous zeolite
; Ordered mesoporous silicas
; Organic-inorganic hybrid
; Propylene carbonate
; Propylene oxide
; Synergistic enhancement
; organic-inorganic materials
英文摘要: An organic-inorganic hybrid catalyst was synthesized by silylation of silanol (Si-OH) groups with ammonium bromide group on the mesopore wall of mesoporous zeolite having a hierarchically nanoporous architecture, conferring both electrophilic and nucleophilic functions due to the acid sites of the zeolite and bromide in the functional group, respectively. In the coupling of carbon dioxide and propylene oxide for production of propylene carbonate, the hybrid catalyst exhibited a synergistic enhancement in activity leading to a two-fold higher product yield than the catalysts having a single catalytic function. Comprehensive reaction studies revealed that the catalytic synergy could only be obtained by achieving close proximity between the ammonium bromide group and acid sites on the zeolite surface. The acidity was also crucial, where no synergy was observed for a similarly designed organic-inorganic hybrid catalyst constructed on weakly acidic ordered mesoporous silica SBA-15. Comparison of the activation energy of the catalysts supported the observation that the zeolite-based hybrid catalyst with stronger acidity gave rise to a lower activation energy (37.3kJmol-1) than the SBA-15-based hybrid catalyst with weaker acidity (51.3kJmol-1). The mesoporous zeolite-based hybrid catalyst was very active under neat conditions without additional organic solvent, and showed good recyclability without significant loss of the initial activity for up to five runs. © 2018 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111807
Appears in Collections: 气候减缓与适应
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作者单位: Department of Chemistry, Chonnam National University, 77 Yongbong-ro, Gwangju, Buk-gu, 61186, South Korea
Recommended Citation:
Kim D.,Na K.. Organic-inorganic multifunctional hybrid catalyst giving catalytic synergies in cooperative coupling between CO2 and propylene oxide to propylene carbonate[J]. Journal of CO2 Utilization,2018-01-01,27