摘要
用改进的柠檬酸络合法制备了CuO//La2O3/γ-Al2O3催化剂,并通过XRD、NH3-TPD技术对样品进行了表征,探索其对乙二胺(ED)和1,2-丙二醇(PG)为原料合成2-甲基吡嗪(2-MP)反应的催化活性。分别考察了催化剂不同金属配比、煅烧温度以及反应温度、气体空速等对催化剂活性的影响。结果表明:当铜铝摩尔比为4∶6,煅烧温度为700℃时催化剂的催化性能最好;在原料液中1,2-丙二醇、乙二胺和水的摩尔比为1∶1∶2、反应温度为320℃、气体空速(GHSV)1 815 h-1的条件下,1,2-丙二醇的转化率为100%,2-甲基吡嗪的收率为82.7%。
CuO//La2O3/γ-A12O3 oxides were prepared by an improved amorphous citric precursor (IACP) and characterized by X-ray diffraction (XRD), temperature programmed desorption of am- monia (NH3-TPD) and temperature programmed reduction (TPR) techniques. The performance tests were carried out upon the synthesis of 2-methylpyrazine (2-MP) from ethylenediamine (ED) and 1, 2-propylene glycol (PG). The influences of different metal mole ratio, calcinating tempera- ture of the catalyst and reaction temperature, gas hourly space velocity (GHSV) on the catalytic ac- tivity were studied. The results demonstrated that the performance of the CuO//La2O3/γ-A12O3 cat- alyst with n ( Cu): n (Al) =4:6 at the ealcinating temperature of 700 ℃ was the best. When the reaction temperature was 320 ℃, using a feed of ED, PG, and water (ED: PG: H2O molar ratio was 1: 1: 2) and the space velocity at 1 815 h^-1, the selectivity of 2-MP reached 82.7% while the con- version of PG was enhanced to 100%.
出处
《广西大学学报(自然科学版)》
CAS
CSCD
北大核心
2012年第3期477-482,共6页
Journal of Guangxi University(Natural Science Edition)
基金
国家自然科学基金资助项目(21063001)
广西自然科学基金资助项目(2010GXNSFA013041)