Abstract—

A MIL-125 metal–organic framework structure was synthesized from titanium and 1, 4-benzenedicarboxylic acid. The specific micropore volume of the synthesized sample was found to be W₀ = 0.59 cm³/g, and the specific BET surface area was S_BET = 1320 m²/g. Analysis of the synthesized material revealed the possibility of its application for accumulating energetically important gases: methane and hydrogen. The adsorption of hydrogen and methane on MIL-125 was experimentally studied within the temperature range of 77−293 K for hydrogen and 213−293 K for methane at absolute pressures up to 1.5 bar. The high heats of methane and hydrogen adsorption on the synthesized sample of about 26 and 14 kJ/mol were evaluated. It was found that, due to narrow pores, the adsorbent may be effective in accumulating methane at high temperatures. MIL-125 exhibited the best adsorption performance for hydrogen. At the temperature of 77 K and atmospheric pressure, the sample can accumulate up to 2.3 wt % hydrogen.

中文翻译：

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MIL-125 金属-有机骨架结构，用于甲烷和氢气的吸附积累

摘要——

MIL-125 金属有机骨架结构由钛和 1, 4-苯二甲酸合成。合成样品的比微孔体积为W ₀ = 0.59 cm ³ /g，比BET表面积为S _BET = 1320 m ²/G。对合成材料的分析揭示了其用于积累能量重要的气体：甲烷和氢气的可能性。在高达 1.5 bar 的绝对压力下，在氢气和甲烷的 77-293 K 温度范围和甲烷 213-293 K 温度范围内，对 MIL-125 上的氢气和甲烷吸附进行了实验研究。评估了合成样品上甲烷和氢气的高吸附热，约为 26 和 14 kJ/mol。发现由于细孔，吸附剂可有效地在高温下积聚甲烷。MIL-125 对氢气表现出最好的吸附性能。在 77 K 的温度和大气压下，样品可以积累高达 2.3 wt% 的氢气。