| 王仲来.MCl2-TiO2-SnO2 (M=Mg, Ca, Sr, Ba) 催化剂甲烷氧化偶联反应性能的研究[J].分子催化,2013,(2):152-158 |
| MCl2-TiO2-SnO2 (M=Mg, Ca, Sr, Ba) 催化剂甲烷氧化偶联反应性能的研究 |
| Catalytic performance of MCl2-TiO2-SnO2 (M=Mg, Ca, Sr, Ba) catalysts for oxidative coupling of methane |
| 投稿时间：2013-01-29 修订日期：2013-03-05 |
| DOI： |
| 中文关键词: 甲烷氧化偶联 MCl2-TiO2-SnO2 (M=Mg, Ca, Sr, Ba)催化剂 催化剂的碱性 乙烯 |
| 英文关键词:oxidative coupling of methane MCl2-TiO2-SnO2 (M=Mg, Ca, Sr, Ba) catalysts catalyst basicity ethylene |
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| 中文摘要: |
| 选用不同的碱土金属氯化物为原料，采用共研磨的方法制备出了具有不同表面碱性的MCl2-TiO2-SnO2 (M=Mg, Ca, Sr, Ba)催化剂，并考察了催化剂的甲烷氧化偶联反应性能。通过N2吸脱附（BET）、X-射线衍射（XRD）、X-射线光电子能谱（XPS）和CO2程序升温脱附（CO2-TPD）等技术对催化剂进行了表征。结果表明，随碱土金属元素的不同，催化剂呈现出了强弱不同的碱性吸附位。催化剂表面的碱性对活化甲烷具有促进作用，同时也带来乙烯深度氧化副反应的发生。越强的弱碱性吸附位对甲烷的活化越有利，而强碱性吸附位则能导致催化剂活性降低，甚至是催化剂失活。乙烯的选择性与催化剂表面晶格氧的相对浓度密切相关。表面晶格氧的相对浓度较高的催化剂，其乙烯选择性也较大。 |
| 英文摘要: |
| The performance of MCl2-TiO2-SnO2 (M=Mg, Ca, Sr, Ba) catalysts in oxidative coupling of methane reaction has been investigated. The catalysts were prepared by grinding method, and characterized by BET, XRD, XPS and CO2-TPD, respectively. The distribution of surface basicity strength is varied with the changing of M2 in the catalysts. The more weak basic sites on catalyst surface are crucial for the activation of methane; while the strong basic sites bring the loss of active sites on catalyst surface. In addition, although the basic site can prompt the conversion of methane, it can also bring the deep oxidative of ethylene.The lattice oxygen is selective to ethylene product generation, and the selectivity to ethylene increase with increasing relative concentration of surface lattice oxygen. |
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