Research Progress on Preparation Technology and Application of Carbon Molecular Sieves Based on Different Raw Materials
Carbon molecular sieve(CMS)had the advantages of developed pore structure,uniform pore size distribution,high thermal stability and chemical stability,which could be used in adsorption,catalysis and other fields.This paper started with the preparation technology and application of CMS.The performance differences of coal,organic polymer and biomass as raw materials for CMS preparation were introduced.The advantages and disadvantages of CMS preparation by activation method,deposition method,thermal polycondensation method and template method were compared.Among them,the carbonization method,activation method and thermal polycondensation method were simple to operate,but the carbonization method had high requirements for raw materials.The activation method used KOH and other activators to produce toxic wastewater,and the thermal polycondensation method consumes more energy.Both the benzene deposition method and the template method could adjust the pore structure,but the benzene deposition was affected by factors such as deposition temperature and flow rate.The template method,liked the activation method,was prone to produce toxic wastewater.The principle of CMS preparation by KOH activation method and benzene vapor deposition method was emphasized.The CMS modification methods such as reducing CMS grain size,introducing hollow or hierarchical pore structure,and retaining the catalytic active center provided by micropores could improve CMS performance.The application status of CMS in adsorption separation,catalysis and other fields was summarized,and the development direction of CMS was prospected,in order to provide theoretical guidance for improving the performance of CMS.
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