| 王真真,何珍珍,韩文锋,刘化章.化学通报,2016,79(12):1139-1144. |
| 制备条件对MoS2/Al2O3耐硫甲烷化催化剂性能的影响 |
| The effects of preparation conditions on the performance of MoS2/Al2O3 sulfur-resistant catalysts for methanation reaction |
| 投稿时间：2016-05-10 修订日期：2016-07-14 |
| DOI： |
| 中文关键词: 制备条件,甲烷化反应,MoO3/Al2O3 |
| 英文关键词:preparation conditions,methanation reaction,MoO3/Al2O3 |
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| 摘要点击次数: 2073 |
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| 中文摘要: |
| 本文研究了MoS2/Al2O3催化剂前驱体MoO3的负载量、浸渍温度和焙烧温度等制备条件对甲烷化反应性能的影响,并通过XRD和H2-TPR表征了催化剂的物相和还原性能。结果表明,随着负载量增加,MoO3与Al2O3间的相互作用增强,Al2(MoO4)3相增多,导致催化剂更难被还原硫化,MoO3还原温度升高。浸渍温度对CO转化率和CH4选择性有一定的影响,浸渍温度为70℃时,MoO3的生成增多,且还原温度最低,CO转化率和CH4选择性较高,而CO2选择性最低。随着焙烧温度升高,CO转化率先升高后降低,对CH4和CO2选择性影响不大,其中以450℃焙烧的CO转化率最高,600℃焙烧的CO转化率最低。当焙烧温度在400℃-450℃时,Al2(MoO4)3和Mo4O11的特征峰基本上消失,能够完全生成MoO3,且结晶度较好、还原温度降低。因此,合适的焙烧温度为400℃-450℃。 |
| 英文摘要: |
| The effects of MoO3 loading content, impregnation temperature and calcination temperature on the performance of MoS2/Al2O3 sulfur-resistant catalysts for methanation reaction are studied. XRD and H2-TPR are employed to investigate the phases and reduction property of catalysts. Results show that with the increasing of MoO3 content, the interaction between MoO3 and Al2O3 enhances and the content of Al2(MoO4)3 increases, which result in the increase of reduction temperature. catalyst impregnated at 70℃ has higher CO conversion and CH4 slectivity and lower CO2 slectivity and MoO3 content increases, reduction temperature decreases. With the increasing of calcination temperature, CO conversion increases firstly and then decreases, but has little effects on CH4 and CO2 selectivity. Catalyst calcinated at 450℃ has the highest CO conversion while CO conversion is lowest of catalyst calcinated at 600℃. Peaks of Al2(MoO4)3 and Mo4O11 nearly disappear at calcinated temperature of 400 to 450℃. Well crystallized MoO3 are formed and reduction temperature decreases. Therefore, the best calcination temperature range is 400-450℃。 |
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