文献类型：期刊文献

英文题名：Searching for efficient defect types in carbon nanofibers to promote supported Pt catalytic activity for dehydrogenation reaction

作者：Tuo, Yongxiao[1];Liu, Xiaojun[1];Shi, Liujie[1];Yang, Liu[1];Li, Ping[1];Yuan, Weikang[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2020

卷号：347

起止页码：87

外文期刊名：CATALYSIS TODAY

收录：;EI(收录号：20182205251928);WOS:【SCI-EXPANDED(收录号:WOS:000542625300003)】；

基金：The authors are grateful for the financial support of the National Natural Science Foundation of China (No. 21276077).

语种：英文

外文关键词：Dehydrogenation - Nitrogen - Platinum - Heat treatment - Nanocatalysts - Organic solvents - Surface defects - Catalyst activity - Doping (additives) - Electronic properties - Metal nanoparticles - Binding energy - Catalyst supports

摘要：Three kinds of carbon nanofibers (CNFs) with different microstructures: platelet CNFs (CNFs-P), fishbone CNFs (CNFs-F) and tubular CNFs (CNFs-T) were synthesized as Pt catalyst supports for decalin dehydrogenation to release hydrogen. Different types of defects including doped nitrogen and edge-like sites were purposefully introduced into three pristine CNFs by employing N-doping and thermal treatment methods. The defective properties of the CNFs were identified by combining the intensity ratio and full width at half maximum of D and G bands derived from Raman spectra of the CNFs. It was revealed together with XPS analysis of Pt 4f7/2 binding energy that the electronic property of Pt nanoparticles is very sensitive to the surface defect density of CNF supports. Further catalytic performance evaluation showed that Pt supported on the CNFs-P which are featured of the largest quantity of exposed edge sites can provide the most proper electronic property of the catalyst due to suitable metal-support interaction, thereby affording the highest catalytic activity. Moreover, N-doping by both in-situ synthesis and post-treatment manner can favor the Pt catalysts on the tubular and fishbone CNFs to increase their activity, but do harm to the activity of the Pt/CNFs-P. Thermal treatment of N-doped CNFs can generate new edge-like defects by removing N-species, thus beneficial to the activity of Pt catalysts on either tubular or fishbone CNFs. Therefore, the edge sites and edge-like defects on the surface of CNFs are proven to be the best ones, which can promote the catalytic activity of the supported Pt nanoparticles for the dehydrogenation reaction efficiently. ? 2018 Elsevier B.V.