The Unique Role of CaO in Stabilizing the Pt/Al2O3 Catalyst for the Dehydrogenation of Cyclohexane

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	The Unique Role of CaO in Stabilizing the Pt/Al2O3 Catalyst for the Dehydrogenation of Cyclohexane
	J. F. Yu; R. Wang; S. Y. Ren; X. Y. Sun; C. L. Chen; Q. J. Ge; W. Fang; J. Zhang; H. Y. Xu; D. S. Su
	2012
发表期刊	Chemcatchem
ISSN	1867-3880
卷号	4 期号:9 页码:1376-1381
摘要	Coke-induced deactivation is one of the major challenges in the field of heterogeneous catalysis. Herein, the performance of the Pt/Al2O3 catalyst for the hydrogen-free dehydrogenation of cyclohexane was improved by doping with a small amount of Ca. The Ca-modified Pt/Al2O3 catalyst exhibited a cyclohexane conversion of 97.0?% and maintained a conversion above 75?% after 48 h, whilst the unmodified catalyst was deactivated from 87.0 to 2.7?% under the same conditions. Characterization techniques, including in situ DRIFT, XPS, thermal analysis, and temperature-programmed techniques, revealed that the presence of Ca effectively suppressed the deep dehydrogenation of H-rich carbonaceous components and promoted coke desorption by increasing the H/C ratio of H-deficient coke. This promotion effect of Ca was also associated with neutralizing the residual Cl ions and promoting immediate dehydrogenation.
部门归属	[wang, rui; ren, shiyuan; sun, xiaoyan; chen, chunlin; zhang, jian; su, dang sheng] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [yu, jiafeng; ge, qingjie; fang, wen; xu, hengyong] chinese acad sci, dalian inst chem phys, dept state key lab catalysis inst, dalian 116023, peoples r china. [yu, jiafeng; sun, xiaoyan; fang, wen] chinese acad sci, grad sch, beijing 100039, peoples r china.;ge, qj (reprint author), chinese acad sci, dalian inst chem phys, dept state key lab catalysis inst, 457 zhongshan rd, dalian 116023, peoples r china.;geqj@dicp.ac.cn; zhangj@imr.ac.cn; xuhy@dicp.ac.cn; dssu@imr.ac.cn
关键词	Calcium Coke Dehydrogenation Heterogeneous Catalysis Platinum Transform Infrared-spectroscopy Pt/gamma-al2o3 Catalyst Alkane Dehydrogenation Coke Characterization Platinum Xps Adsorption Metal Methylcyclohexane Isomerization
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60418
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. F. Yu,R. Wang,S. Y. Ren,et al. The Unique Role of CaO in Stabilizing the Pt/Al2O3 Catalyst for the Dehydrogenation of Cyclohexane[J]. Chemcatchem,2012,4(9):1376-1381.
APA	J. F. Yu.,R. Wang.,S. Y. Ren.,X. Y. Sun.,C. L. Chen.,...&D. S. Su.(2012).The Unique Role of CaO in Stabilizing the Pt/Al2O3 Catalyst for the Dehydrogenation of Cyclohexane.Chemcatchem,4(9),1376-1381.
MLA	J. F. Yu,et al."The Unique Role of CaO in Stabilizing the Pt/Al2O3 Catalyst for the Dehydrogenation of Cyclohexane".Chemcatchem 4.9(2012):1376-1381.