TY - JOUR
T1 - 气相法制备ZIF-8纳米膜包覆Pt/SiO2催化剂及其炔烃半加氢性能
AU - Luo, Gen
AU - Zhang, Bin
AU - Yang, Xin Chun
AU - Wu, Hui Bin
AU - Meng, Fan Chun
AU - Zhai, Li Ming
AU - Qin, Yong
N1 - Publisher Copyright:
© 2021, Science Press. All right reserved.
PY - 2021/9
Y1 - 2021/9
N2 - In this work, ZIF-8/Pt/SiO2 catalysts were prepared by combining atomic layer deposition (ALD) and vapor phase conversion methods. First, Pt metal nanoparticles were deposited on SiO2 nanowires by ALD. Then, ZnO was further deposited, also by ALD. Subsequently, the ZnO film was converted into ZIF-8 film by vapor phase crystallization to form a sandwich structure (ZIF-8/Pt/SiO2). The microstructures of the catalysts were characterized by XRD, TEM, BET, IC-MS, XPS, and CO-DRIFT. It was shown that the Pt particles were highly dispersed on the SiO2nanowires before and after coating with ZIF-8, and the ZIF-8 film was coated continuously on the entire catalyst with high conformity. The performance of the catalyst was studied by using the semi-hydrogenation of 1-heptyne as a probe reaction. The ZIF-8 film induces an electron density increase in the Pt component, leading to an increase of the olefin selectivity from 14% to 70% in the 1-heptyne hydrogenation reaction. A reduced thickness of the ZIF-8 film increases the catalytic activity but does not affect the selectivity of 1-heptylene.
AB - In this work, ZIF-8/Pt/SiO2 catalysts were prepared by combining atomic layer deposition (ALD) and vapor phase conversion methods. First, Pt metal nanoparticles were deposited on SiO2 nanowires by ALD. Then, ZnO was further deposited, also by ALD. Subsequently, the ZnO film was converted into ZIF-8 film by vapor phase crystallization to form a sandwich structure (ZIF-8/Pt/SiO2). The microstructures of the catalysts were characterized by XRD, TEM, BET, IC-MS, XPS, and CO-DRIFT. It was shown that the Pt particles were highly dispersed on the SiO2nanowires before and after coating with ZIF-8, and the ZIF-8 film was coated continuously on the entire catalyst with high conformity. The performance of the catalyst was studied by using the semi-hydrogenation of 1-heptyne as a probe reaction. The ZIF-8 film induces an electron density increase in the Pt component, leading to an increase of the olefin selectivity from 14% to 70% in the 1-heptyne hydrogenation reaction. A reduced thickness of the ZIF-8 film increases the catalytic activity but does not affect the selectivity of 1-heptylene.
KW - Atomic layer deposition
KW - Semi-hydrogenation
KW - Vapor phase crystallization
KW - ZIF-8 film
UR - http://www.scopus.com/inward/record.url?scp=85116545068&partnerID=8YFLogxK
U2 - 10.1016/S1872-5813(21)60075-0
DO - 10.1016/S1872-5813(21)60075-0
M3 - 文章
AN - SCOPUS:85116545068
SN - 2097-213X
VL - 49
SP - 1316
EP - 1325
JO - Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology
JF - Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology
IS - 9
ER -