TY - JOUR
T1 - Effect of zinc addition on catalytic properties of PtSnK/γ-Al 2O 3 catalyst for isobutane dehydrogenation
AU - Zhang, Yiwei
AU - Zhou, Yuming
AU - Shi, Junjun
AU - Sheng, Xiaoli
AU - Duan, Yongzheng
AU - Zhou, Shijian
AU - Zhang, Zewu
PY - 2012/4
Y1 - 2012/4
N2 - The effect of zinc addition on the catalytic properties of PtSnK/γ-Al 2O 3 catalyst for isobutane dehydrogenation has been investigated by reaction tests and some physicochemical characterizations such as nitrogen adsorption, H 2 chemisorption, H 2-TPD, NH 3-TPD, TPR, TEM and TPO. It was found that suitable addition of Zn (0.2 and 0.4 wt.%) to PtSnK/γ-Al 2O 3 catalyst could not only increase the platinum dispersion by geometric effect, but also decrease the carbon depositions. In these cases, the presence of zinc strengthened the interactions between Sn species and the support, thus inhibiting the reduction of Sn species. Among the catalysts studied, the PtSnKZn(0.4%)/Al catalyst exhibited the best performance in terms of isobutane conversion and stability. However, when the content of Zn was excessive, the interfacial character between metal and support, and the character of Pt metal had been changed. The formation of PtZn alloy resulted in the loss of catalytic activity and stability, while had a promoting effect for the reaction selectivity.
AB - The effect of zinc addition on the catalytic properties of PtSnK/γ-Al 2O 3 catalyst for isobutane dehydrogenation has been investigated by reaction tests and some physicochemical characterizations such as nitrogen adsorption, H 2 chemisorption, H 2-TPD, NH 3-TPD, TPR, TEM and TPO. It was found that suitable addition of Zn (0.2 and 0.4 wt.%) to PtSnK/γ-Al 2O 3 catalyst could not only increase the platinum dispersion by geometric effect, but also decrease the carbon depositions. In these cases, the presence of zinc strengthened the interactions between Sn species and the support, thus inhibiting the reduction of Sn species. Among the catalysts studied, the PtSnKZn(0.4%)/Al catalyst exhibited the best performance in terms of isobutane conversion and stability. However, when the content of Zn was excessive, the interfacial character between metal and support, and the character of Pt metal had been changed. The formation of PtZn alloy resulted in the loss of catalytic activity and stability, while had a promoting effect for the reaction selectivity.
KW - Catalyst
KW - Isobutane dehydrogenation
KW - Isobutene
KW - Zinc
UR - http://www.scopus.com/inward/record.url?scp=84856258874&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2011.12.040
DO - 10.1016/j.fuproc.2011.12.040
M3 - 文章
AN - SCOPUS:84856258874
SN - 0378-3820
VL - 96
SP - 220
EP - 227
JO - Fuel Processing Technology
JF - Fuel Processing Technology
ER -