Porous Carbon Synthesized from Porous Inorganic Non-metallic Minerals Templates
Porous carbon adsorbents derived from inorganic materials templates such as zeolite and mesoporous silicate attracted considerable attention in the last decade and got great progress in recent years.However,so far almost all of templates used in the process were artificial porous materials;the porous carbons prepared by this method are very costly,which restricts the synthesis and application of templated porous carbons.In order to reduce the cost of templated porous carbons,natural inorganic porous minerals have been taken into consideration,which maybe possible and promising templates to prepare carbon adsorbents.In this work,we describe template process using tubular halloysite,rich mesoporous zeolite and low bulk density diatomite,as exemplars of the categories of inorganic porous templates which we have studied and discussed the effects of different templating structure on the resultant carbons.Two main carbon precursors,sucrose and furfuryl alcohol,were used respectively.The morphology of minerals and corresponding templated carbons were characterized using electron microscopy.The pore structures of minerals and templated carbons were characterised with nitrogen adsorption.The results showed that the morphology and pore structure of porous carbons are in good pertinence to those of corresponding templates.The morphology and pore structure of templated carbons could reflect those of corresponding templates at nanometer level.The templated carbons with high specific surface areas and rich mesopores can be prepared by using these three kinds of natural porous minerals as templates.The higher the surface area and pore volume of the minerals,the higher those of the corresponding carbons.The template carbons from halloysite possessed higher pore volume and mesoporosities.Based on the large mounts of experiment results,a model for the mechanism of resultant nanopores formation has been proposed.The nanopores of templated carbons are mainly composed of three kinds of pores: templated pores formed by removing mineral,hereditary pores formed by inheriting the pores of templates and nanopores formed during carbonization.These three kinds of pores have a close relationship with corresponding template.
Porous carbon Porous Inorganic Non-metallic Minerals Template Method Nanopores formation mechanism model
A.P.Wang Z.H.Huang F.Kang Z.C.Guo L.Zhou
Beijing General Research Institute of Mining and Metallurgy,Beijing China Laboratory of Advanced Matetrials,Department of Material Science and Engineering,Tsinghua University
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3433-3440
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）