【摘要】 研制了天然气和氧经偶联反应制环氧乙烷（ＥＯ）的Ａｇ－Ｂａ－Ｃｓ／Ａｌ２Ｏ３催化剂（ＮＥＯ－１）．用Ｎ２＋Ｏ２＋Ｃ２Ｈ４和偶联产物气加氧作原料气，在２５０℃、空速２５００ｈ－１时，乙烯转化率和ＥＯ选择性分别达到３０％和８０％．ＮＥＯ－１催化剂具有适宜的比表面积和孔结构，用ＸＰＳ分析发现，与新鲜的催化剂相比，经活化和反应后的催化剂表面的Ｂａ、Ｃｓ原子浓度增高，并具有较多的吸附氧物种．更多还原

【Abstract】 The high efficiency Ag Ba Cs /Al 2O 3 catalyst ( α Al 2O 3 with 15% impregnated Ag) was prepared for the production of EO. The C 2H 4 conversion and EO selectivity obtained on the catalyst are 30% and 80%, respectively, using N 2+O 2+C 2H 4 and product gas of OCM as feed gas at conditions: feed gas space velocity 2 500 h -1 , reaction temperature 250℃. The catalyst has favorable specific surface area and pore size distribution. Comparing with the fresh catalyst, the surface of catalyst after activation and 8 h run is enriched in Cs and Ba atoms and possesses more adsorption oxygen species.更多还原