Hierarchical carbon nanofibers/graphene composite containing nanodiamonds for direct dehydrogenation of ethylbenzene

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• 作者：Housseinou Ba^a ; ^b ; ¹ ; Lai Truong-Phuoc^a ; ¹ ; Yuefeng Liu^a ; ^{yuefeng.liu@unistra.fr" class="auth_mail" title="E-mail the corresponding author} ; Cuong Duong-Viet^a ; Jean-Mario Nhut^a ; Lam Nguyen-Dinh^c ; Pascal Granger^b ; Cuong Pham-Huu^a ; ^{cuong.pham-huu@unistra.fr" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Carbon
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：96
• 期：Complete
• 页码：1060-1069
• 全文大小：2305 K

文摘

Hierarchical structure characterized by the decoration of few-layer graphene (FLG) surface with a dense network of carbon nanofibers (CNF) was synthesized by Chemical Vapor Deposition. This hierarchical composite was further used as host matrix for the dispersion of nanodiamonds (ND) to produce a metal-free catalyst for the direct dehydrogenation (DH) process of ethylbenzene (EB) to styrene. The as-synthesized three-dimension ND/CNF-FLG composite displays excellent dehydrogenation activity and stability, especially under severe reaction conditions similar to those in the industrial process. Up to 600 °C with EB concentration of 10 vol.%, the ND/CNF-FLG catalyst displays a significant high DH activity of along with 91.3% styrene selectivity. In addition, no deactivation is observed during more than 70 h of test. The outstanding catalytic performance and the superior stability of the hybrid ND/CNF-FLG composite compared to the conventional carbon-based and promoted iron industrial catalysts, render it among the most promising metal-free catalyst for industrial direct dehydrogenation process.