摘要
分别采用浸渍法和共沉淀法制备了负载金属氧化物的固体碱催化剂MnO/Al2O3(M=Na,K,Cs,Mg,Ca,Sr;n=1,2)和C-Cs2O/Al2O3,测定了催化剂的碱量和pKa值,分别采用CO2-TPD、X射线衍射、N2物理吸附表征了催化剂的物理化学性质。以异丁烯与多聚甲醛经Prins反应制备3-甲基-3-丁烯-1-醇(MBO)为体系考察催化剂活性。结果表明,催化剂的碱性和结构直接影响其催化活性,采用共沉淀法制备的Cs2O/Al2O3催化剂具有更强的碱性,表现出了优越的反应活性,甲醛的转化率和产物MBO的选择性分别为100.0%和86.0%。探讨了固体碱催化反应的机理,发现碱性位可以活化异丁烯的α-H,促进Prins反应。
Solid base catalysts MnO/Al2O3 （M=Na, K, Cs, Mg, Ca, Sr,n=1 or 2） prepared by impregnation method and C-Cs2O/Al2O3 by co-precipitation method were applied in Prins reaction. Their base amount and pKa in water were determined. The structure and physico-chemical properties of the carrier and prepared catalysts were characterized by CO2-TPD, X-ray diffraction, and nitrogen adsorption. The performance of catalysts was evaluated by condensation reaction of isobutene with paraformaldehyde to produce 3-methyl-3-buten-1-ol. The results showed that the performance of catalysts related directly with their basic property and structure. The C-Cs2O/Al2O3 catalyst had stronger basicity and showed superior catalytic performance, and the conversion of formaldehyde and selectivity to MBO reached up to 100.0% and 86.0% respectively. The mechanism of Prins reaction over solid base catalyst was also discussed. The base sites could active theα-H of isobutene, and so could promote the Prins reaction.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第10期3911-3918,共8页
CIESC Journal
基金
中国博士后科学基金项目(2014M551347)~~
作者简介
第一作者：王海永（1987-），男，硕士研究生。
联系人：曹贵平。
