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摘要: 考察了Mo及温度对Ni/ZnO催化乙醇水蒸气重整制氢的活性、选择性和抗积炭性能的影响。结果表明，773K适量添加Mo能提高Ni/ZnO催化剂的活性和氢气选择性；Ni/ZnO及Ni-Mo/ZnO催化剂的活性随着温度的升高而提高，823K乙醇完全转化；873K时，Mo质量分数为0.83%的Ni-Mo/ZnO催化剂对氢气的选择性最高；添加Mo可以提高Ni/ZnO催化剂的抗积炭能力，从而提高该催化剂的稳定性。程序升温还原（TPR）和X射线衍射（XRD）结果表明，添加Mo有利于Ni氧化物在载体上的分散；减弱氧化态镍物种与载体之间的作用，从而提高了催化剂的活性、选择性和稳定性。Abstract: Effects of Mo addition and the reaction temperature on the activity, the selectivity and the anticarbondeposition of over Ni/ZnO catalyst for ethanol steam reforming were studied. The results of reaction at 773K suggested that the activity and selectivity to H2 of Ni/ZnO catalyst were promoted after the appropriate addition of Mo. The activities of the catalysts increased with the increase of the reaction temperature. Ethanol was converted completely at 823K. At 873K, NMZ-2 catalyst, in which the content of Mo was 0.83%, showed the optimum activity, the highest selectivity towards hydrogen and the best stability among the catalysts. The ability of anti-carbon-deposition of NZ can be promoted by addition of Mo, accordingly, the stability of this catalyst is improved. TPR and XRD results show that addition of Mo is contribute to the dispersion of nickel oxide over ZnO and weakens the interaction between Ni oxide and the support. Therefore, the activity, selectivity and stability of Ni/ZnO catalyst are improved.
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Key words:
- Mo /
- Ni/ZnO /
- ethanol steam reforming /
- hydrogen production
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