Carbon Molecular Sieves Derived From Bituminous Coal And Pore Structure Adjustment

Carbon molecular sieve (CMS) generally one kind of carbon absorbent, in the narrow sense is one kind of narrow pore distribution activated carbon, has the highly developed pore structure and the special character of surface. These materials are receiving increasing attention due to their practical interest in fields such as catalysis and separation of gas mixtures. Now the problem in which the humanity faces energy, resources and environment and so on, Carbon molecular sieve are considered one of the key technologies materials which to solve that.The main objective of this thesis is composed of three parts:The surface area of the sample was measured by the ethanol adsorption method (the static desiccator method) in self-assembly experimental installation, which was applied to analyze with change of specific surface area of the samples. Carbon molecular sieves derived from bituminous coal and polyimide composites. Carbon molecular sieves derived from bituminous coal and poly(furfuryl-alcohol) composites.The ethanol mass method was applied to measure the surface area of the sample, and the results were compared with BET surface area measured by nitrogen adsorption. The research shows that the ethanol mass method is accurate and valuable. The influences of carbonization and activation technology of bituminous coal on surface area of CMS were discussed by the ethanol mass method, exploring the best process conditions. CMS can be prepared through several processes such as via controlled pyrolysis or activation of carbonaceous materials and modification of the texture of activated carbons through Chemical Vapor Deposition (CVD) of an organic substance. The application of carbon deposition has several drawbacks; this approach inevitably produces large amounts of uncracking deposition agents which are harmful for human and environment in the process of CVD. The pore structure of precursors was adjusted firstly in order to avoid the drawback of CVD. A series of carbon molecular sieves (CMS) were obtained by carbonizing bituminous coal and polyimide composites, bituminous coal and poly (furfuryl-alcohol) composites. The preparation process of bituminous coal and polyimide composites involves three stages of making the composite of bituminous coal and polyamic acid, carbonizing and chemical activating, respectively. The preparation process of bituminous coal and poly (furfuryl-alcohol) composites involves three stages of the porous carbon was prepared, furfuryl alcohol was adsorbed and solidification, and carbonization. The influence of contents of polymer and carbonization technology on the pore structure of CMS was discussed in detail. Base on FTIR and SEM analysis of CMS surface, the optimum process conditions were proposed. The changes of pore structure of CMS were analyzed and characterized by N2 adsorption. The results were showed that it has adjusting pore structure function in the CMS's preparation when polymer was blending into the precursor. By controlling the content of polymer can realize to control pore structure of CMS. This thesis enriches forms of Anhui coal utilization and has opened the way to raise the additional value of them. It will provide basal technical support to the new functional CMS applied in energy, petrochemical, environment and materials engineering in relevant.