Li_2O对Pt-Sn/γ-Al_2O_3催化剂表面酸性与MCH脱氢性能的影响  

INFLUENCES OF Li_2O ON ACIDITY AND MCH DEHYDROGENATION PERFORMANCE OF Pt-Sn/γ-Al_2O_3 CATALYST

作　　者：陈进富[1] 俞英[1] 蔡卫权[1] 

机构地区：[1]石油大学化工学院,北京102200

出　　处：《太阳能学报》2002年第6期782-785,共4页Acta Energiae Solaris Sinica

基　　金：国家"973"重大基础科研项目子课题 (G2 0 0 0 0 2 640 7)

摘　　要：利用吡啶吸附 IR、NH3吸附 脱附、原位热重积碳等技术并结合MCH的脱氢活性试验 ,研究了Li2 O对工业Pt Sn/γ Al2 O3催化剂的表面酸性及MCH脱氢性能的影响。结果表明 ,Li2 O能有效地调变催化剂的表面酸性 ,降低其表面酸中心特别是强酸中心的数目 ;MCH脱氢反应的积炭量随Li2 O含量的增加而减少 ,当Li2 O含量为 0 .4wThe influences of Li2O on the acidity and MCH dehydrogenation performance of industry Pt-Sn/γ-Al2O3 catalyst are studied by using pyridine-IR, adsorption and desorption of NH3, thermogravimetry (TG) and MCH dehydrogenation. The results show that almost all of the acid sites on the surface of the industry catalyst are Lewis type. The total number of acid sites, especially the number of acid sites with strong acidity and the rate of carbon deposition on the surface of Pt-Sn/γ-Al2O3 catalyst decrease with Li2O content increasing. The dehydrogenation catalyst has the best stability at Li content for 0.4 w% in the condition: 0.12 MPa, 500°C, WHSV=6h-1, pure MCH feed.

关 键 词：LI2O Pt-Sn/γ-Al2O3 表面酸性 MCH 储氢 甲基环己烷 脱氢催化剂 脱氢稳定性 氧化锂 

分 类 号：TQ116.2[化学工程—无机化工]