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| 论文编号: |
O120090148 |
| 第一作者所在部门: |
902组 |
| 中文论文题目: |
Effect of H2O on Cu-based catalyst in one-step slurry phase dimethyl ether synthesis
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| 英文论文题目: |
Effect of H2O on Cu-based catalyst in one-step slurry phase dimethyl ether synthesis
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| 论文题目英文: |
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| 作者: |
王东升 韩怡卓 谭猗生椿范立
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| 论文出处: |
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| 刊物名称: |
Fuel Processing Technology
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| 年: |
2009
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| 卷: |
90 |
| 期: |
3 |
| 页: |
446–451 |
| 联系作者: |
谭猗生 |
| 收录类别: |
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| 影响因子: |
2.066
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| 摘要: |
One-step dimethyl ether (DME) synthesis in slurry phase was catalyzed by a hybrid catalyst composed of a Cu-based methanol synthesis catalyst and a γ-Al2O3 methanol dehydration catalyst under reaction conditions of 260 °C and 5.0 MPa. It was found that instability of the Cu-based catalyst led to rapid
deactivation of the hybrid catalyst. The stability of the Cu-based catalyst under DME synthesis conditions was compared with that under methanol synthesis conditions. The results indicated that harmfulness of water, which formed in DME synthesis, caused the Cu-based catalyst to deactivate at a high rate. Surface physical analysis, elemental analysis, XRD and XPS were used to characterize the surface physical properties, components, crystal structures and surface morphologies of the Cu-based catalysts. It was found that Cu0 was the active component for methanol synthesis and Cu2O might have less activity for the reaction. Compared with methanol synthesis process, crystallite size of Cu became bigger in DME synthesis process, but carbon deposition was less severe. It was also found that there was distinct metal loss of Zn and Al caused by hydrothermal leaching, impairing the stability of the catalyst. In slurry phase DME synthesis, a part of Cu transformed into Cu2(OH)2CO3, causing a decrease in the number of active sites of the Cu-based catalyst. And some ZnO converted to Zn5(OH)6(CO3)2, which caused the synergistic effect between Cu and ZnO to become weaker. Crystallite size growth of Cu, carbon deposition, metal loss of Zn and Al, formation of Cu2(OH)2CO3 and Zn5(OH)6(CO3)2 were important reasons for rapid deactivation of the Cu-based catalyst. |
| 英文摘要: |
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| 备注: |
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