TY - JOUR
T1 - Preparation of Pt/TiO2/ZSM-5 catalyst for catalytic conversion of n-butane
AU - Liu, Jia
AU - Jiang, Guiyuan
AU - Zhao, Zhen
AU - Han, Shanlei
AU - Zhang, Yaoyuan
AU - Yang, Qingxin
AU - Sun, Qianyao
AU - Wang, Yajun
N1 - Publisher Copyright:
© All Right Reserved.
PY - 2016/8/5
Y1 - 2016/8/5
N2 - Pt/TiO2/ZSM-5 catalyst with dehydrogenation-cracking bifunctionality catalytic activity was prepared by modifying ZSM-5 zeolite with titanium dioxide (TiO2) via sol-gel method and then loading Pt to the titanium modified ZSM-5 zeolite by incipient impregnation method. The as-prepared catalyst was characterized by means of XRD, N2 adsorption-desorption, TEM, XPS and NH3-TPD to analyze crystal structure, pore properties, morphology, valence states of active metal and acid properties of the catalyst, and the catalytic performance for the cracking of n-butane into light olefins was investigated. The results showed that the introduction of titanium dioxide provided additional acid sites to ZSM-5 zeolite, especially increasing the strong acid centers and enhancing the activation of n-butane. In addition, after reduction in hydrogen atmosphere, the partially reduced Ti3+ species was generated which was catalyzed by platinum due to the strong metal-support interaction (SMSI) between Pt and TiO2. The formation of appropriate amount of Ti3+ species enhanced the electron density around Pt, and thus weakened the adsorption of ethene and propene on Pt atoms. After reduction by hydrogen at 450℃, n-butane conversion of 76.1% and yield of light olefins (C2=-C3=) of 50.9% were achieved at the reaction temperature of 625℃ over Pt/10TiO2/ZSM-5 catalyst, which was 16.7% and 12.6% higher than those of Pt/ZSM-5 catalyst, respectively.
AB - Pt/TiO2/ZSM-5 catalyst with dehydrogenation-cracking bifunctionality catalytic activity was prepared by modifying ZSM-5 zeolite with titanium dioxide (TiO2) via sol-gel method and then loading Pt to the titanium modified ZSM-5 zeolite by incipient impregnation method. The as-prepared catalyst was characterized by means of XRD, N2 adsorption-desorption, TEM, XPS and NH3-TPD to analyze crystal structure, pore properties, morphology, valence states of active metal and acid properties of the catalyst, and the catalytic performance for the cracking of n-butane into light olefins was investigated. The results showed that the introduction of titanium dioxide provided additional acid sites to ZSM-5 zeolite, especially increasing the strong acid centers and enhancing the activation of n-butane. In addition, after reduction in hydrogen atmosphere, the partially reduced Ti3+ species was generated which was catalyzed by platinum due to the strong metal-support interaction (SMSI) between Pt and TiO2. The formation of appropriate amount of Ti3+ species enhanced the electron density around Pt, and thus weakened the adsorption of ethene and propene on Pt atoms. After reduction by hydrogen at 450℃, n-butane conversion of 76.1% and yield of light olefins (C2=-C3=) of 50.9% were achieved at the reaction temperature of 625℃ over Pt/10TiO2/ZSM-5 catalyst, which was 16.7% and 12.6% higher than those of Pt/ZSM-5 catalyst, respectively.
KW - Catalyst
KW - Light olefins
KW - Molecular sieves
KW - Pt/TiO/ZSM-5
KW - Strong metal-support interaction
UR - http://www.scopus.com/inward/record.url?scp=85092426612&partnerID=8YFLogxK
U2 - 10.11949/j.issn.0438-1157.20160464
DO - 10.11949/j.issn.0438-1157.20160464
M3 - Article
AN - SCOPUS:85092426612
SN - 0438-1157
VL - 67
SP - 3363
EP - 3373
JO - Huagong Xuebao/CIESC Journal
JF - Huagong Xuebao/CIESC Journal
IS - 8
ER -