Insight into the Enhanced Selectivity of Phosphate-Modified Annealed Nanodiamond for Oxidative Dehydrogenation Reactions

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	Insight into the Enhanced Selectivity of Phosphate-Modified Annealed Nanodiamond for Oxidative Dehydrogenation Reactions
	X.; Ding Sun, Y.; Zhang, B.; Huang, R.; Chen, D.; Su, D. S.
	2015
发表期刊	Acs Catalysis
ISSN	2155-5435
卷号	5 期号:4 页码:2436-2444
摘要	Due to a lack of fundamental understanding of the surface properties of nanocarbons, tuning their surface active sites for higher selectivity of oxidative dehydrogenation reactions has always been a great challenge for carbon catalysis. In this contribution, annealed nanodiamond was controllably grafted by phosphate, which was demonstrated to be an efficient way to adjust the nanodiamond surface and significantly improve the propene selectivity in the oxidative dehydrogenation reaction. We conducted an in-depth study to explore the role of phosphate modification in the reaction in terms of the interactions between phosphate and carbon surface, the evolution and preferential location of phosphorus species, the promotion mechanism, and the impact on the reaction pathway. The results revealed that phosphate preferentially reacts with the phenol groups initially present on the nanodiamond surface, and then it selectively blocks the defect sites that lead to COx formation with an increased propene selectivity. During this process, the catalyst active sites (ketonic carbonyl groups) were not affected. Such effects originated from the formation of covalent C-O-P bonds on the carbon surface, which was estimated as 15 wt % loading.
部门归属	[sun, xiaoyan ; ding, yuxiao ; zhang, bingsen ; huang, rui ; su, dang sheng] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [chen, de] norwegian univ sci & technol, dept chem engn, n-7491 trondheim, norway. ; su, ds (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; dssu@imr.ac.cn
关键词	Nanodiamond Phosphate High Selectivity Oxidative Dehydrogenation Mechanism Surface-chemistry Carbon Nanofibers Functional-groups Activated Carbon N-butane Catalysts Phosphorus Ethylbenzene Propane Inhibition
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73927
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X.,Ding Sun, Y.,Zhang, B.,et al. Insight into the Enhanced Selectivity of Phosphate-Modified Annealed Nanodiamond for Oxidative Dehydrogenation Reactions[J]. Acs Catalysis,2015,5(4):2436-2444.
APA	X.,Ding Sun, Y.,Zhang, B.,Huang, R.,Chen, D.,&Su, D. S..(2015).Insight into the Enhanced Selectivity of Phosphate-Modified Annealed Nanodiamond for Oxidative Dehydrogenation Reactions.Acs Catalysis,5(4),2436-2444.
MLA	X.,et al."Insight into the Enhanced Selectivity of Phosphate-Modified Annealed Nanodiamond for Oxidative Dehydrogenation Reactions".Acs Catalysis 5.4(2015):2436-2444.