摘要
以超稳Y沸石、葫芦脲-6((C6H6N4O2)6)和SiO2为载体,H2.25Cs0.7Cu0.25As0.1PMo11VO40(简记为PMo11VO40)杂多酸为活性组分,制备了3种负载型杂多酸催化剂,用于催化甲基丙烯醛(MAL)氧化合成甲基丙烯酸(MAA);采用电感耦合等离子发射光谱、傅里叶变换红外光谱、氮吸附、热重-差热分析、程序升温脱附和程序升温还原等方法对催化剂进行了表征。实验结果表明,PMo11VO40/(C6H6N4O2)6催化剂的性能最好,在300℃、停留时间3.0s、n(MAL)∶n(空气)∶n(氮气)∶n(水)=5∶62.5∶12.5∶20的条件下,MAL转化率为83.5%,MAA选择性为89.7%;催化剂酸量的增大有助于提高MAA选择性;适当增大催化剂的比表面积有利于提高MAL转化率。
Synthesis of methacrylic acid (MAA) from methacrolein (MAL) was studied on supported H2.25Cs0.7Cu0.25As0.1PMo11VO40( PMo11VO40 ) heteropolyacid catalysts. Ultrastable Y zeolite, cucurbit - 6 uril ((C6H6N4O2)6) and silica were used as supports separately. The catalysts were characterized by means of ICP, FTIR, N2 adsorption, TG - DTA, TPD and TPR. Under the optimal conditions: PMo11VO40/(C6H6N4O2)6 as catalyst, reaction temperature 300 ℃ ,residence time 3.0 s and n(MAL) : n(air) : n(N2) : n(H20) 5 : 62.5 : 12.5 : 20, conversion of MAL and selectivity to MAA can reach 83.5 % and 89.7%, respectively. Proper enhancement of catalyst acidity can increase selectivity to MAA. Increase of catalyst specific surface area can improve conversion of MAL.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2007年第3期276-281,共6页
Petrochemical Technology
基金
中国石油天然气集团公司科学研究与技术开发项目(04B704)