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题名: Effect of ZnO additives and acid treatment on catalytic performance of Pt/WO3/ZrO2 for n-C-7 hydroisomerization
作者: Liu, Yan;  Guan, Yejun;  Li, Can;  Lian, Juan;  Gan, Geok Joo;  Lim, Eng Chew;  Kooli, Fethi
关键词: Pt/WO3-ZrO2 catalysts ;  ZnO ;  acid treatment ;  n-heptane hydroisomerization ;  pyridine-FTIR
刊名: JOURNAL OF CATALYSIS
发表日期: 2006-11-15
DOI: 10.1016/j.jcat.2006.08.015
卷: 244, 期:1, 页:17-23
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The effect of WO3 (5-50 wt%) and ZnO (0.7-22 wt%) on the catalytic properties of Pt/WO3/(ZnO)-ZrO2 for n-heptane (n-C-7) hydroisomerization was investigated. The optimized WO3 and ZnO contents are 20 wt% and 3.4 wt%, respectively. The catalytic performance is achieved at 81 % n-C-7 conversion and 89% C-7 isomer selectivity at 250 degrees C, which is reproducible and can be kept constant over 82 h under reaction conditions. Both WO3 and ZnO can stabilize the tetragonal phase of ZrO2. The Bronsted acid-to-Lewis acid ratio should be optimized to achieve high catalytic performance. The activity for Pt/WO3/ZrO2 using Zr(OH)(4) as the catalyst support (n-C-7 conversion, 88% at 250 degrees C) is much higher than that for Pt/WO3/ZrO2 with ZrO2 as the support (n-C-7 conversion, 9% at 250 degrees C) with the same Pt and WO3 loadings. BET, SEM-EDX, and pyridine-FTIR analyses show that acid treatment can successfully enhance the surface area (from 73 to 91 m(2)/g), increase the number of Bronsted acid sites, and lower the surface Zn:Zr ratio (from 0.43 to 0.15) for ZnO-ZrO2 with 22 wt% ZnO. The yield of C-7 isomers is increased from nil to 47% at 300 degrees C on Pt/WO3/ZnO-ZrO2 catalyst after acid treatment. It is suggested that n-heptane hydroisomerization activity is related to acidity, surface area, and crystalline phase of ZrO2. (c) 2006 Elsevier Inc. All rights reserved.
关键词[WOS]: N-HEPTANE ISOMERIZATION ;  TUNGSTEN-OXIDE ;  MODIFIED ZIRCONIA ;  HEXADECANE ;  SITES ;  HYDROGENATION ;  OXYNITRIDES ;  PROMOTION ;  ZEOLITES ;  WO3-ZRO2
语种: 英语
WOS记录号: WOS:000242130100003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140277
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Inst Chem & Engn Sci, Singapore 627833, Singapore
2.Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Liu, Yan,Guan, Yejun,Li, Can,et al. Effect of ZnO additives and acid treatment on catalytic performance of Pt/WO3/ZrO2 for n-C-7 hydroisomerization[J]. JOURNAL OF CATALYSIS,2006,244(1):17-23.
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