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题名: Characterization of coke deposited on spent catalysts for long-chain-paraffin dehydrogenation
作者: He, Songbo1;  Sun, Chenglin1;  Yang, Xu1;  Wang, Bin2;  Dai, Xihai2;  Bai, Ziwu2
关键词: Dehydrogenation ;  Coke ;  Deactivation ;  Long chain paraffin ;  Pt-Sn catalysts
刊名: CHEMICAL ENGINEERING JOURNAL
发表日期: 2010-10-01
DOI: 10.1016/j.cej.2010.07.024
卷: 163, 期:3, 页:389-394
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: The chemistry, morphology, and structure character of coke deposited on spent catalysts for long-chain-paraffin (n-C(16-19)) dehydrogenation and the effect of coke on the surface structure of the catalysts were studied by several characterization techniques: thermogravimetry/differential thermal analysis (TG-DTA), elemental analysis, UV Raman spectroscopy, temperature-programmed oxidation (TPO), scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunaucr-Emmett-Teller (BET), mercury intrusion porosimetry (MIP) and CO-chemisorption. During the dehydrogenation of n-C(16-19), coke gradually accumulates on the surfaces of the catalysts while the coking rate and the H/C mole ratio of the coke decrease. After the times on stream (TOS) of 960h, the coke deposition on the catalysts is up to 6.56 wt.%, and the H/C mole ratio of the coke is only 0.86. The coke is graphited or amorphous nature and contains conjugated olefinic species and polycyclic aromatic hydrocarbons (PAHs). The coke causes a significant deactivation of the active sites. As compared with the fresh catalysts, the surface area, the total pore volume and the Pt dispersion of the spent catalysts are decreased 19.4%, 33.3% and 61.2%. (C) 2010 Elsevier B.V. All rights reserved.
关键词[WOS]: PT-SN CATALYSTS ;  ALKANE DEHYDROGENATION ;  REFORMING CATALYSTS ;  DEACTIVATION ;  ALUMINA ;  OLEFINS ;  PT-SN-K/AL2O3 ;  CONVERSION ;  CHEMISTRY ;  ZEOLITES
语种: 英语
WOS记录号: WOS:000283449400028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141917
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.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
2.PetroChina Fushun Petrochem Co, Fushun 113001, Liaoning, Peoples R China

Recommended Citation:
He, Songbo,Sun, Chenglin,Yang, Xu,et al. Characterization of coke deposited on spent catalysts for long-chain-paraffin dehydrogenation[J]. CHEMICAL ENGINEERING JOURNAL,2010,163(3):389-394.
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