摘要
用XRD、XPS、NH_3-TPD、FT-IR及化学吸附等手段研究了负载B_2O_3、Fe_2O_3等氧化物对Hβ沸石表面酸性和丙烯醚化反应性能的影响.结果表明:负载的B_2O_3、Fe_2O_3与Hβ-Al_2O_3沸石间有较强的相互作用,B和Fe的化学环境有明显改变;氧化物调变了Hβ-Al_2O_3沸石的酸性,使总酸量增加,强酸中心强度下降,L酸中心比例提高;氧化物使丙烯醚化反应活性增强,抑制了异丙醇脱水反应;丙烯转化率与催化剂表面L酸量存在很好的对应关系。
The effect of B_2O_3 and Fe_2O_3 on the surface acidity and propylene etherificationwith isopropanol to isopropyl ether has been investigated by XRD, XPS ,NH_3-TPD, FT-IRand chemisorption.These impregnated oxides played a great role in modifying the total sur-face acid amount and distribution of acid strength.The stronger interaction between oxidesand Hβ-Al_2O_3 enhanced the L acid amount.Meanwhile,the performance of propylene etheri-fication was obviously improved.A good relationship between propylene conversion and sur-face L acid amount was detected.
出处
《应用化学》
CAS
CSCD
北大核心
1995年第6期21-24,共4页
Chinese Journal of Applied Chemistry
基金
中国博士后科学基金资助课题
关键词
氧化物
丙烯醚化
表面酸性
分子筛
催化
oxide,Hβ-zeolite ,propylene etherification ,surface acidity