摘要
用湿混法(M)、溶胶凝胶-酸法(A)、溶胶凝胶-碱法(B)分别制备一系列镁硅混合氧化物,用X射线粉末衍射(XRD)、氮气吸附脱附(BET)、场发射扫描电镜(FE-SEM)及程序升温脱附(TPD)对其进行表征。在固定床反应器上比较了用不同方法制备催化剂的性能。考察了反应温度、N2体积空速(GHSV)和乙醇液相空速(LHSV)对乙醇转化率和1,3-丁二烯选择性的影响。结果表明:以溶胶凝胶-酸法(A)制备的镁硅配比为1催化剂(Mg Si-A^(-1))具有高比表面和明显的晶格特征,其催化性能最好。在425℃,N2GHSV为2 000 h^(-1),乙醇LHSV为2.8 h^(-1)条件下反应,乙醇转化率达44.9%,1,3-丁二烯的选择性为27.7%。溶胶凝胶-酸法(A)制备的催化剂(Mg Si-A^(-1))具有较高的稳定性,在80 h内催化性能没有明显下降。
A series of mixed oxides of magnesium and silicon are prepared by wet-kneading method（ M）,sol-gel acid method（ A） and sol-gel base method（ B）,respectively,which are characterized with XRD,BET,FE-SEM and TPD. The performance of catalysts prepared by different methods is compared on a fixed bed reactor. The effects of reaction temperature,N2 GHSV and ethanol LHSV on ethanol conversion and 1,3-butadiene selectivity are investigated.The results show that the catalyst prepared by the sol-gel acid method（ A） with the Mg / Si ratio of 1 has the high specific surface area and clear crystal feature,and exhibits the best catalytic performance. Under the conditions of 425 ℃,N2 GHSV of 2 000 h^（-1）and ethanol LHSV of 2. 8 h^（-1）,the ethanol conversion and 1,3-butadiene selectivity are 44. 9% and27. 7%,respectively. The catalyst prepared by the sol-gel acid method（ A） Mg Si-A^（-1） displays the highest stability and it can be used for 80 hours without noticeable loss of activity.
出处
《现代化工》
CAS
CSCD
北大核心
2016年第7期104-108,共5页
Modern Chemical Industry
关键词
乙醇
1
3-丁二烯
催化剂制备方法
镁硅混合氧化物
催化剂评价
ehanol
1
3-butadiene
catalyst preparation method
mixed oxides of magnesium and silicon
catalyst evaluation
