作者：Xia, Y.;Yang, Z.;Mokaya, R.;
作者單位：College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom;School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom;School of Chemistry, University of Nottingha
刊名：Chemical vapor deposition
ISSN：0948-1907
出版年：2010-01-05
卷：16
期：41194
起頁：322
止頁：328
分類號：TQ175
語種：英文
關鍵詞：Hydrogen storage;Microporosity;Porous carbon;Template;Zeolite;
內容簡介We report on a systematic study of CVD-based synthesis strategies for the nanocasting of zeolite-templated porous carbon materials using commercially available zeolite Y as a hard template. Our findings clarify how the properties of the zeolite-templated carbons and their hydrogen storage capacity are affected by (i) the nature of carbon precursor, (ii) the way the carbon precursor is introduced into the zeolite template pores, and (iii) the use of a single step versus two sequential CVD steps. Depending on the synthesis strategy used, the porous carbon materials exhibit variable structural ordering and tunable textural properties with surface area of 850a- a2160am~2ag~(-1) and pore volume of 0.87a-a1.26acm~3ag~(-1). A significant proportion of the porosity, i.e., up to 90% of the surface area and 80% of the pore volume, arises from micropores. The templated carbons exhibit hydrogen-uptake capacity in the range 1.9-4.9awt.-% (at -196a°C and under 20 bar) which is determined by the textural properties, however all the carbon materials have similar hydrogen heat of adsorption of 8.5-9.0akJamol~(-1) due to their similar carbon framework. A systematic study of CVD-based synthesis strategies for the fabrication of zeolite-templated carbons, using commercially available zeolite Y as hard template, has generated predominantly microporous carbons with surface area of 850-2160m~2/g and pore volume of 0.87-1.26cm~3/g. The templated carbons exhibit variable hydrogen uptake capacity in the range 1.9-4.9wt% (at -196°C and 20 bar), with the uptake dependent on the textural properties. The study clarifies on the effect of the nature of carbon precursor and the influence of using two CVD steps or a combination of liquid impregnation and CVD.
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