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Nanocrystallites-forming hierarchical porous Ni/Al(2)O(3)-TiO(2) catalyst for dehydrogenation of organic chemical hydrides




作者: Zhu, Gangli; Yang, Bolun
发表/完成日期: 2011-10-06
期刊名称: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
期卷: 36(21)
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论文简介
Dehydrogenation of organic chemical hydrides has been improved by reconstructing the catalyst in the form of hierarchical porous structure nanocatalyst, in which the economical Ni was adopted as catalytic component and nano Al(2)O(3)-TiO(2) hybrid composite as support. The Al(2)O(3)-TiO(2) composite was prepared by spontaneous self-assembly of nano Al(2)O(3) and TiO(2) aggregates by hydrolysis of tetra-n-butyl-titanate under continuous agitation. The multi-scaled distribution of Al(2)O(3)-TiO(2) aggregates with hierarchy could be observed in dynamic light scattering spectrometer. The aggregates are comprised of nano-sized gamma-Al(2)O(3) and anatase TiO(2) crystallites with sizes of about 5 and 7 nm, respectively. The surface modulation by TiO(2) could be verified in FTIR Spectra. The migration of Ti species and crystallite growth were hindered by the Al(2)O(3) skeleton and the hierarchical porous structure was sustained during the thermal related process. The multi-scaled distributed pores were confirmed by both TEM analysis and N(2) adsorption results. The results of dehydrogenation experiments showed that the hierarchical porous structure nano Nil Al(2)O(3)-TiO(2) exhibited superior catalytic performance to Ni/Al(2)O(3) with the optimum conversion of 99.9% at 400 degrees C, while the catalyst of Ni/Al(2)O(3) exhibited only 16.5% under the same condition. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
IDS 号: 837MV