摘要
考察了Mnx-Mg1-x/SiO2催化剂对乙腈和甲醇选择性合成丙烯腈的催化性能,采用X射线粉末衍射(XRD),Raman光谱和程序升温脱附(TPD)技术对催化剂的物相及其表面性质进行了表征。结果表明,Mn的加入能提高MgO在SiO2表面的分散程度。同时,双组分催化剂与单组分催化剂的表面酸碱性有较大差别,这种差别可能有利于乙腈与甲醇选择性合成丙烯腈。在该系列催化剂中,当x=0.8时,催化剂的活性最高。反应温度480℃时,丙烯腈的选择性为88.6%,乙腈的转化率为31.5%。
Catalystic synthesis of acrylonitrile from acetonitrile and methanol was achieved on Mnx-Mg1-x/SiO2 catalysts. Acidity and basicity of phase and surface of catalysts were investigated by means of XRD, Raman and TPD methods. Presence of Mn improved distribution of MgO on SiO2 surface. Surface acid-base properties of two-component and single-component catalysts were different and this difference might be favorable for synthesis of acrylonitrile. As a result, effect of Mn0.8-Mg0.2/SiO2 to the reaction was the best among catalysts in this study. Selectivity of acrylonitrile was 88.6% and conversion of acetonitrile was 31.5%.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2005年第1期30-33,共4页
Petrochemical Technology
基金
浙江省自然科学基金资助项目(RC00043)
教育部科技研究重点项目(地方01045)
关键词
锰
镁
二氧化硅
催化剂
甲醇
乙腈
丙烯腈
manganese
magnesium
silicon dioxide
catalyst
methanol
acetonitrile
acrylonitrile
