Study Of The Manufacture And Adsorption Property Of The Material For Selective Adsorption To Coalbed Methane

Methane is the clean fuel with the highest heating value and the least CO2 emissions among all carbon-contained fuels. As a main component of natural gas, coal-bed gas and marsh gas, resulting from its longer terms of use than that of oil, methane may significantly ease the oil crisis. However, like other gas energy sources, the storage and transport of methane is a barrier to constrain its broader commercialization. Gas absorption storage is a promising approch to make the breakthrough and the key to the technology is that development of new adsorbents for this purpose. Metal-organic frameworks (MOFs), synthesized from metal and multi- chelated organic ligands, is a kind of zeolite-like framework materials with special pore structure, which has been a hotspot in last 10 years. The topology, size, and surface properties of its pores can be controlled and regulated through the selection of metal ions and organic ligands or its branched groups. And owing to its great superiority on porosity and specific surface area compared with zeolite molecular sieves, it has attractive potential in the areas as shape selective and chiral catalyses, adsorption separation, molecular identification, photoelectric technology, sensors, biological simulation, micro-reactors, medical clinic, etc. So MOFs are expected to be an adsorbent for methane purification, separation and methane storage.In the paper, using Zn(â…¡) and H2BCD as building molecules, we got block-shaped (a), sheet-shaped (b), needle-shaped(c) MOFs crystal, respectively, with low temperature hydrothermal synthesis method. The effects of concentration of building molecules, pH values, ammonia usage, temperature and coolimg rates on crystal forming were studied experimentally and explored theoretically in this paper. The samples were characterized with IR spectra to affirm the organic groups in the frameworks, powder and single-crystal X-ray diffraction to determine the crystal structure and composition of frameworks, scanning electron microscope to observe the crystal aspects and shapes, N2 adsorption isotherms at low temperature to mensurate the specific surface area and pore size distribution, and with TGA/DGA analysis to scale the thermal stability. Furthermore, dissolution properties and the desorption capability of methane on block-shaped crystal (a) were explored.Through our study, we found that transparent block-like, sheet-like, and needle-like MOF materials could be constructed from 1, 4-benzenedicarboxylic acid...