不同制备方式的铜基甲醇合成催化剂的性质和结构研究 |
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引用本文: | 郭宪吉,陈炳义,鲍改玲,李利民. 不同制备方式的铜基甲醇合成催化剂的性质和结构研究[J]. 天然气化工, 2003, 28(2): 9-13 |
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作者姓名: | 郭宪吉 陈炳义 鲍改玲 李利民 |
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作者单位: | 1. 郑州大学化学系,郑州,450052 2. 平顶山工学院,平顶山,467000 |
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摘 要: | 采用3种不同的沉淀方式(正加、反加和并流)制备出3个具有相同组成的甲醇合成催化剂样品CuO/ZnO/Al2O3,它们的活性顺序为:并流法样品>反加法样品>正加法样品;还原温度由低到高的顺序为:反加法样品<并流法样品<正加法样品。通过对催化剂前驱物进行DTA分析,证实了3种沉淀过程中相应的Cu2+和Zn2+的沉淀行为,即在并流和反加沉淀过程中,Cu2+和Zn2+同时均匀地沉淀,而在正加沉淀过程中,Cu2+和Zn2+发生分步沉淀。催化剂氧化态的IR结果表明了由3种沉淀方式所获得的样品中CuO和ZnO组分间相互作用的强弱。
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关 键 词: | 甲醇合成 铜基催化剂 CuO/ZnO/Al2O3 沉淀方式 |
文章编号: | 1001-9219(2003)02-09-05 |
Structure and properties of copper-based catalysts for methanol synthesis prepared by different precipitation methods |
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Abstract: | Three copper based catalysts(CuO/ZnO/Al2O3 )for methanol synthesis with the same Cu/Zn/Al atomic ratio (5∶4∶1) were prepared by normal precipitation (that is addition of a solution of Na2CO3 to a mixed solution of Cu2+, Zn2+ and Al3+) , reverse precipitation (addition of a mixed solution of Cu2+, Zn2+ and Al3+ to a solution of Na2CO3) and parallel flow precipitation, respectively The activities of the catalysts indicate that the parallel flow precipitation method is the best, and the reverse precipitation method is also much better than the normal precipitation method The order of reduction temperature from low to high obtained by TPR is as follows: reverse precipitation catalysts
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Keywords: | methanol synthesis copper-based catalyst precipitation method |
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