Enhanced (photo)catalytic activity of Wells-Dawson (H6P2W18O62) in comparison to Keggin (H3PW12O40) heteropolyacids for 2-propanol dehydration in gas-solid regime

被引：18
|
作者：
Marci, Giuseppe [1 ]
Garcia-Lopez, Elisa I. [1 ]
Pomilla, Francesca Rita [1 ,2 ]
Liotta, Leonarda F. [3 ]
Palmisano, Leonardo [1 ]
机构：
[1] Univ Palermo, Dipartimento Energia Ingn Informaz & Modelli Mate, Schiavello Grillone Photocatalysis Grp, Viale Sci, I-90128 Palermo, Italy
[2] Univ Calabria, Dipartimento Ingn Ambiente & Terr & Ingn Chim, Via Pietro Bucci, I-87036 Cosenza, Italy
[3] CNR, ISMN, Via Ugo La Malfa,153, I-90146 Palermo, Italy
来源：
APPLIED CATALYSIS A-GENERAL | 2016年 / 528卷
关键词：
Keggin; Wells-Dawson; Heteropolyacid; Polyoxometalate; 2-Propanol dehydration; Photocatalysis; PSEUDO-LIQUID PHASE; TERT-BUTYL ETHER; ACID CATALYSTS; POLYOXOMETALATE; TIO2; PHOTOCATALYSTS; CHEMISTRY; ISOBUTANE; BEHAVIOR; SURFACE;
D O I：
10.1016/j.apcata.2016.10.002
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Catalytic and photocatalytic 2-propanol dehydration to propene at atmospheric pressure and a temperature range of 60-120 degrees C were carried out in gas-solid regime by using bare and supported Keggin H3PW12O40 (PW12) and Wells-Dawson H6P2W18O62 (P2W18) heteropolyacids (HPAs). Binary materials were prepared by impregnation of the HPAs on commercial SiO2 and TiO2. The Wells-Dawson was in any case more active than the Keggin heteropolyacid and the differences were enhanced when the supported samples were used. In particular, Wells-Dawson HPA supported on TiO2 and under irradiation showed the highest activity. The HPA species played the key role both in the catalytic and photo-assisted reactions. The acidity of the cluster accounts for the catalytic role, whereas both the acidity and the redox properties of the HPA species were responsible for the increase of the reaction rate in the photo-assisted catalytic reaction. The estimated apparent activation energy resulted always lower for the photocatalytic process than for the catalytic one. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：113 / 122
页数：10
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