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题名: ZrO2 support imparts superior activity and stability of Co catalysts for CO2 methanation
作者: Li, Wenhui1;  Nie, Xiaowa1;  Jiang, Xiao3, 4;  Zhang, Anfeng1;  Ding, Fanshu1;  Liu, Min1;  Liu, Zhongmin2;  Guo, Xinwen1;  Song, Chunshan1, 3, 4
关键词: CO2 methanation ;  Cobalt catalyst ;  ZrO2 ;  Al2O3 ;  Interface
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2017-10-29
DOI: 10.1016/j.apcatb.2017.08.048
卷: 220, 页:397-408
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Screening of various supports reveals that Co catalysts supported on ZrO2 and Al2O3 show good initial activity for CO2 methanation. Co/ZrO2 and Co/Al2O3 catalysts prepared by impregnation with different metal loadings were further examined comparatively. The 10Co/ZrO2 catalyst showed high activity with CO2 conversion of 92.5% and CH4 selectivity of 99.9% without deactivation after 300 h time on stream (TOS). However, the 10Co/ Al2O3 catalyst gave a lower CO2 conversion of 77.8% which decreased to 38.6% after 300 h TOS. The catalysts were characterized by STEM/EDS (scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy), in situ XRD(X-ray diffractometer), H2-TPR(temperature programmed reduction), XPS (X-ray photoelectron spectroscopy), chemisorption of H-2, CO, CH4, CO2 and NI-13-TPD (temperature programmed desorption). Re-dispersion of Co species on the ZrO2 support during reduction by H-2 was observed by STEM/EDS. New Co-Zr phase formed on the Co-ZrO2 interface was directly observed by TEM for the first time; the Co/ZrO2 catalyst exhibited high stability with high activity for CO2 conversion. In situ XRD, H-2-TPR and XPS results indicate the promoting effect of ZrO2 on the reduction of CO3O4 to Co metal along with the negative effect of A1203. The oxygen vacancies on the ZrO2 detected by XPS may help to activate CO2 and H2O and resist deactivation. Co/Al2O3 catalyst deactivates rapidly due to coke deposition and spinel formation.
关键词[WOS]: FISCHER-TROPSCH SYNTHESIS ;  DENSITY-FUNCTIONAL THEORY ;  CARBON-DIOXIDE METHANATION ;  SYNTHETIC NATURAL-GAS ;  COBALT CATALYSTS ;  LOW-TEMPERATURE ;  HETEROGENEOUS CATALYSIS ;  SUSTAINABLE DEVELOPMENT ;  TIO2 PHOTOCATALYSTS ;  CO/AL2O3 CATALYSTS
语种: 英语
WOS记录号: WOS:000412957200039
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150126
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ Technol, Sch Chem Engn, PSU DUT Joint Ctr Energy Res, State Key Lab Fine Chem, Dalian 116024, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Natl Engn Lab Methanol Olefins, Dalian 116023, Peoples R China
3.Penn State Univ, Dept Energy & Mineral Engn, PSU DUT Joint Ctr Energy Res, Clean Fuels & Catalysis Program,EMS Energy Inst, University Pk, PA 16802 USA
4.Penn State Univ, Dept Chem Engn, PSU DUT Joint Ctr Energy Res, Clean Fuels & Catalysis Program,EMS Energy Inst, University Pk, PA 16802 USA

Recommended Citation:
Li, Wenhui,Nie, Xiaowa,Jiang, Xiao,et al. ZrO2 support imparts superior activity and stability of Co catalysts for CO2 methanation[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,220:397-408.
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