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OALib Journal期刊
ISSN: 2333-9721
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焙烧温度对k改性ag-fe/zno-zro2催化剂结构和co加氢合成低碳混合醇醚性能的影响
, PP. 323-330
Keywords: ag-fe催化剂,焙烧温度,一氧化碳加氢,低碳混合醇醚
Abstract:
？采用并流共沉淀法在不同焙烧温度下制备k改性ag-fe/zno-zro2催化剂,考察不同焙烧温度对催化剂co加氢合成低碳混合醇醚反应性能的影响。通过n2物理吸附(n2-adsorption)、x射线衍射(xrd)、氢气程序升温还原(h2-tpr)、一氧化碳程序升温脱附(co-tpd)等手段对催化剂进行表征。结果表明,250℃焙烧的催化剂,由于焙烧温度较低,表面尚未形成足够多的活性位,未能达到最佳的催化性能;300℃焙烧的催化剂,其co转化率最高、醇醚选择性较高,醇醚时空产率达到最大值。随着焙烧温度进一步升高,co转化率逐渐降低,醇选择性先降低后增大,二甲醚(dme)选择性逐渐增大,醇醚时空产率逐渐降低。催化剂性能主要与其比表面积、还原性能、所含银铁复合物分散度及co吸脱附性能有关,即比表面积较大、易于被还原、银铁复合物分散度较高以及较多的co吸脱附活性位,有利于催化剂co加氢转化。催化剂表面活性位对co的非解离吸附强度降低,有利于醇醚产物的生成;而对co的解离吸附强度增强,则不利于烃类产物的生成。
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