Steam reforming of acetic acid using Ni/Al2O3 catalyst: Influence of crystalline phase of Al2O3 support |
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| Authors: | Guanyi Chen Junyu Tao Caixia Liu Beibei Yan Wanqing Li Xiangping Li |
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| Affiliation: | 1. School of Science, Tibet University, No. 36 Jiangsu Street, Lhasa 850012, Tibet Autonomous Region, China;2. School of Environmental Science and Engineering/China-Australia Centre for Sustainable Urban Development, Tianjin University, Tianjin 300072, China;3. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China |
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| Abstract: | Ni-based catalysts supported on various alumina supports with different crystalline phases (γ-, α-, θ- and δ-Al2O3) were prepared and the effects of crystalline phases on the catalytic performance towards acetic acid steam reforming (AASR) were investigated. An acetic acid conversion of nearly 100% was observed in all the four catalysts, and their hydrogen selectivities were in the following order: Ni/α-Al2O3 (90%) > Ni/γ-Al2O3 (79%) > Ni/δ-Al2O3 (53%) > Ni/θ-Al2O3 (25%). Using different characterization methods, the inner relationship between catalyst crystalline phase and catalytic properties was determined. Through TEM, H2-TPR and XPS characterization, Compared with α-Al2O3, on the surface of other crystalline phases of Al2O3 support were formed NiAl2O4 which indicated stronger interaction intensity between these supports and Ni., and that would reduce the formation of metallic Ni. It was confirmed that metallic Ni played a core role of catalytic AASR. More metallic Ni content caused better C | |
| Keywords: | Acetic acid reforming Hydrogen production Ni catalyst Crystalline phase Biomass conversion |
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