纳米多孔磷酸镍（II）中的氢吸附

Hydrogen adsorption in nanoporous nickel(II) phosphates.

作者信息

Forster Paul M, Eckert Juergen, Chang Jong-San, Park Sang-Eon, Férey Gérard, Cheetham Anthony K

机构信息

Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA.

出版信息

J Am Chem Soc. 2003 Feb 5;125(5):1309-12. doi: 10.1021/ja028341v.

DOI:10.1021/ja028341v

PMID:12553832

Abstract

Hydrogen sorption in the nanoporous nickel phosphates VSB-1 and VSB-5 has been studied with a combination of BET, temperature programmed desorption (TPD), and inelastic neutron scattering (INS) measurements. H(2) BET isotherms for VSB-1 are similar to those seen in nanoporous zeolites, while VSB-5 adsorbs substantially more hydrogen due to a steep initial uptake at low partial pressures. TPD data show that hydrogen interacts strongly with VSB-5, with desorption peaks at 109 and 149 K in a nitrogen flow, whereas the absence of similar peaks for VSB-1 suggests a weaker interaction. INS spectra of the rotational tunnel transition of the adsorbed H(2) also reveal a strong interaction with the VSB-5 host. These data strongly suggest the existence of coordinatively unsaturated Ni(2+) sites accessible to H(2) molecules in the pores of VSB-5.

摘要

通过结合BET、程序升温脱附（TPD）和非弹性中子散射（INS）测量，对纳米多孔磷酸镍VSB - 1和VSB - 5中的氢吸附进行了研究。VSB - 1的H₂ BET等温线与纳米多孔沸石中的相似，而VSB - 5由于在低分压下有陡峭的初始吸附量，吸附的氢要多得多。TPD数据表明，氢与VSB - 5强烈相互作用，在氮气流中脱附峰出现在109和149 K，而VSB - 1没有类似的峰，这表明相互作用较弱。吸附的H₂旋转隧道跃迁的INS光谱也揭示了与VSB - 5主体的强相互作用。这些数据有力地表明，在VSB - 5的孔中存在H₂分子可接近的配位不饱和Ni²⁺位点。