| 甲醇燃料车尾气净化催化剂的研究(Ⅱ)──多组分催化剂对甲醇的深度氧化 |
| 摘要点击 1451 全文点击 1012 修订日期：1993-06-22 |
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| 中文关键词 甲醇 甲醛 甲酸甲酯 深度氧化 催化剂 甲醇燃料 |
| 英文关键词 methanol formaldehyde methyl formate deep oxidation catalyst |
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| 中文摘要 |
| 利用色谱-微反联用技术研究多种多元催化剂对甲醇深度氧化的活性,并借助于XRDBET等手段考察焙烧温度对活性的影响。结果表明,不同的催化剂对甲醇氧化时均有甲醛及甲酸甲酯伴生,其伴生温度区间及最大伴生浓度随不同催化剂而变化;32-37号催化剂的活性明显高于双组分催化剂;添加少量稀土金属氧化物CeO2和贵金属Pd对活性均有一定的改善作用;提高焙烧温度,催化剂表面发生烧结,对活性有不良影响。 |
| 英文摘要 |
| Several kinds of multicomponent catalysts for a deep oxidation of methanol were studied for their activities and surface features by means of GC-MR,XRD, SEM,BET etc. The studies were also conducted on the effects of calcination temperature,oxygen level in the atmosphere and space-velocity on the activities of catalysts.The results show that the oxidation of methanol over all the catalysts studied produced formaldehyde (HCHO) and methyl formate (HCOOCH3), and both the temperature ranges in which they could be produced and the maximum concentrations at which they could be produced varied for different catalysts.Catalysts No.32-37 were found to have a significantly high activity than the bicompont catalysts.The addition of a rare earth metal oxide(CeO2)and a noble metal(Pd) in a small amount to such catalysts could improve their activities to an extent.Increased calcination temperatures would cause the catalyst surfaces to be sintered,making the activities reduced. Increased space-velocities could give a slightly higher rate of methanol eonvertion.The oxygen level was found to be preferably at 5% and a level of over 10% would have only a small effect on methanol convertion. |
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