| 姜辉,$2.负载型钼基催化剂上甲烷,乙烷无氧芳构化反应研究[J].分子催化,1998,(5):335-341 |
| 负载型钼基催化剂上甲烷,乙烷无氧芳构化反应研究 |
| Methane and Ethane Aromatization without Using Oxidant over Supported Mo Catalysts |
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| DOI： |
| 中文关键词: 甲烷 乙烷 无氧芳构化 钼基 催化剂 芳构化 |
| 英文关键词:Methane, Ethane, Aromatization without using oxidant, Supported Mo catalysts, Reduction, Induction Period |
| 基金项目: |
| 姜辉 $2 |
| 中国科学院大连化学物理研究所催化基础国家重点实验室 |
| 摘要点击次数: 1108 |
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| 中文摘要: |
| 研究了不同载体钼基催化剂上甲烷，乙烷的无氧芳构化反应。在所采用的载体中，ＨＺＳＭ－５具有最佳性能，对甲烷的芳构化反应，Ｍｏ／ＨＺＳＭ－５催化剂表现出较高的活性和芳烃选择性；而Ｍｏ／Ａｌ２Ｏ３或Ｍｏ／ＳｉＯ２催化剂则相对较差。对于乙烷的反应，钼物种的存在更有利于甲烷或乙烯的生成，芳烃选择性相对较低。钼物种较强的断键能力可能是使甲烷Ｃ－Ｈ键活化的原因。 |
| 英文摘要: |
| Methane and ethane aromatization without using oxidant over various supported Mo catalysts has been studied. Among all the used supporters (Al 2O 3, SiO 2, HZSM 5), HZSM 5 is the best one. For methane reaction, Mo/HZSM 5 catalyst shows higher reactivity and aromatics selectivity than Mo/Al 2O 3 or Mo/SiO 2 catalysts. For ethane reaction, however, the existence of molybdenum species is favorable for production of methane ( over Mo/HZSM 5 or Mo/SiO 2 ) or ethene (over Mo/Al 2O 3 ), which results in lower aromatics selectivity. The good cracking ability of molybdenum species may be responsible for the activation of methane. It is found that all the reactions using methane as reactant show induction period prior to the initiation of benzene formation, while those using ethane as reactant do not do so. TPSR results show that there is doublet structure on the corresponding curves of CO 2 and H 2O for methane reaction, which demonstrates the step reduction of molybdenum species. As for ethane reaction, however, there is no such phenomenon. Therefor, we suggest that induction period of methane reaction ( prior to the initiation of benzene formation) should be related to the reduction of molybdenum species. |
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