摘要
研究了添加不同助剂对钼基复合氧化物催化剂对异丁烯选择性氧化制备甲基丙烯醛反应的影响.结合XRD,TPR和FTIR等表征手段对催化剂的结构进行了研究.结果表明,加入适量的铋能够提高催化剂的性能,铁和钴元素能明显改变催化剂结构和表面性能,从而提高异丁烯的转化率和甲基丙烯醛的选择性.同时发现某种特定晶相及晶相之间的协同作用是提高催化剂性能的关键.筛选出在最佳催化剂上异丁烯的转化率为99.9%,甲基丙烯醛的选择性为88.7%.
The molybdenum-based multiphasic oxide catalysts were prepared and tested in the selective oxidation of isobutylene to methacrolein reaction.The structure and crystal phase of catalysts were characterized by means of XRD,TPR and FTIR methods.The characterization results showed that the adding of bismuth into molybdenum catalysts could enhance the catalytic performance.The adding of iron and cobalt could change the structure and crystal phase of catalysts and significantly improved the conversion of isobutene and selectivity of methacrolein.The results indicate that the synergetic or cooperation effects between multiphasic oxides and the some special phases may be the key role for increasing the catalytic performance.The conversion of isobutene and selectivity of methacrolein can reached 99.9% and 88.7% over the best composed catalyst,respectively.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第2期325-329,共5页
Chemical Journal of Chinese Universities
关键词
钼
金属复合氧化物
异丁烯
选择氧化
Molybdenum
Multiphasic oxide
Isobutene
Selective oxidation
