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以十六烷基三甲基溴化铵为模板剂,正硅酸四乙酯为硅源,在碱性条件下一步法水热晶化合成掺杂金属的介孔分子筛MCM-48。采用XRD、N2吸附脱附对产品进行结构表征,结果表明金属掺杂的介孔分子筛仍保持了三维立方介孔结构,但有序性略有降低,比表面积减小。对样品进行储氢性能研究发现,纯的MCM-48氢吸附量随温度的降低而增加,在0.2MPa、-25℃时氢吸附量达0.678 8%;金属掺杂介孔分子筛中,Ni、Fe、Pd有利于提高储氢量,Zr、Mg反而使氢吸附量减小,其中Ni-MCM-48在0.2MPa、-10℃时氢吸附量最高,达到0.772 0%。
Using cetyltrimethylammonium bromide as templating agent and tetraethyl orthosilicate as silicon source, the mesoporous molecular sieve MCM-48 doped with metal was synthesized by one-step hydrothermal method under alkaline conditions. The structure of the product was characterized by XRD and N2 adsorption-desorption. The results showed that the metal-doped mesoporous molecular sieve retained the three-dimensional cubic mesoporous structure, but the ordering decreased slightly and the specific surface area decreased. Hydrogen storage properties of the samples were studied. The results showed that the hydrogen adsorption capacity of pure MCM-48 increased with the decrease of temperature, and the hydrogen adsorption capacity reached 0.678 8% at 0.2MPa and -25 ℃. In the metal-doped mesoporous molecular sieves, Fe and Pd help to increase the hydrogen storage capacity. Zr and Mg reduce the hydrogen adsorption capacity. Ni-MCM-48 has the highest hydrogen adsorption capacity of 0.7720% at 0.2MPa and -10 ℃.