| Coalbed methane, known as its main component is CH4and N2, also contains a small amount of CO2.Methane is a greenhouse gas, also is important chemical raw material and clean energy, but the presence of CO2and N2affects the utilization of methane, and coalbed methane contain a large number of CH4is discharged directly into the air, not only serious impact on the environment, is a huge waste of energy, make full use of CH4in coalbed methane is of great significance. This paper studies the preparation of13X zeolite/activated carbon composites in the process of activation time on its carbon content and pore structure, and different activation time samples respectively on CH4, N2pure component gas adsorption performance and its influence on the separation of CH4/N2ratio. Studied the crystal shape, pore structure of these samples after NH4Cl treated and the CH4, N2pure component gas adsorption performance and their separation ratio on these samples after NH4Cl treated. Further, adjustment pore structure of13X zeolite/activated composites carbon, utilize liquid carbon deposition by phenolic resin ethanol liquid. Study the effects of the impregnation times, impregnation liquid concentration, impregnation time, heat treatment temperature to the result of liquid carbon deposition and CH4and N2pure component gas adsorption performance and their separation ratio on the samples of different impregnation times.Aims to provide a efficient adsorbent to separation and purification of methane in coalbed methane. In this paper the main research contents and conclusions are as follows:1.Coal gangue, pitch, SiO2to a certain proportion mixed preparation of13X zeolite/activated carbon composites, by changing the activation time preparation for a series of activated13X zeolite/activated carbon composite samples, measured carbon content and by XRD, N2adsorption-desorption at low temperature and CO2adsorption characterization for all the samples, results show that the carbon content of sample decrease with activation time, after activation time of24h, continue to extend the activation time, carbon content of sample almost the same. Samples of XRD diagrams contain characteristic peak of X zeolite, The samples preparation by activation time of24h containing the larges BET surface area, microporous surface area and pore volume, respectively:1018m2/g,868m2/g and0.765cm3/g. And microporous (<2nm) of the sample is the most.2.Studies series composite samples under different activation time prepared by NH4Cl treated,and CH4and N2pure component gas equilibrium adsorption capacity and adsorption separation ratio on the samples before and after NH4C1treated.the results show that the equilibrium adsorption amount of CH4and N2on series composite samples before and after NH4C1treated on as the extension of activation time first increases and then decreases trend, the equilibrium adsorption amount of CH4and N2on the samples which activation time of24h prepared to the maximum. Samples contrast before and after NH4Cl treated, equilibrium adsorption amount of the samples after NH4C1treated is decreased, but the adsorption separation ratio of CH4/N2got greatly ascend, CH4/N2separation ratio as high as3.4, on the sample which activation time of24h prepared and after the NH4C1treated.3. Adjustment pore structure of13X zeolite carbon/carbon composite which is prepared under activation time of24h utilize liquid carbon deposition by phenolic resin ethanol liquid. The effects of the impregnation times, impregnation liquid concentration, impregnation time, heat treatment temperature to the result of liquid carbon deposition was discussed and characterization by XRD, N2adsorption-desorption at low temperature and CO2adsorption characterization. The results show that the formation of crystal of composites unaffect by carbon deposition. The best conditions for carbon deposition:impregnation times for4times, impregnation liquid concentration is0.4g/ml, mpregnation time is2h, heat treatment temperature of700℃. |
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