Porosity and surface properties of mesoporous silicas and their carbon replicas investigated with quasi-equlibrated thermodesorption of n-hexane and n-nonane
Porosity and surface properties of mesoporous silicas and their carbon replicas investigated with quasi-equlibrated thermodesorption of n-hexane and n-nonane
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DOI：
10.1007/s10934-009-9345-9
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发表时间：
2010-12
影响因子：
2.6
通讯作者：
W. Makowski;M. Leżańska;M. Mańko;J. Włoch
中科院分区：
文献类型：
--
作者：
W. Makowski;M. Leżańska;M. Mańko;J. Włoch
利用带色谱检测器的标准TPD装置，采用准平衡热解吸技术研究了正己烷和正壬烷在介孔胶束模板二氧化硅（SBA-15和mlv多层囊泡）及其碳复制物（CMK-3和ocm -洋葱样碳质材料）上的吸附。通过热解吸曲线对正己烷吸附等压线的分析，揭示了碳质材料中存在的大量吸附位点的异质性。由正壬烷对硅质和碳质材料的热解吸曲线计算的孔径分布与低温氮吸附等温线计算的结果一致。他们证实了SBA-15、CMK-3和OCM中介孔结构均匀，以及MLV材料中介孔结构更为复杂。
Adsorption ofn-hexane andn-nonane on mesoporous micelle-templated silicas (SBA-15 and MLV—multilayer vesicle) and on their carbon replicas (CMK-3 and OCM—onion-like carbonaceous material) was studied by means of quasi-equilibrated thermodesorption technique, utilising a standard TPD setup with a chromatographic detector. Analysis ofn-hexane adsorption isobars, determined from the thermodesorption profiles, revealed substantial heterogeneity of the adsorption sites present in the carbonaceous materials. The pore size distributions calculated from the thermodesorption profiles ofn-nonane for both siliceous and carbonaceous materials were in agreement with those obtained from the low-temperature nitrogen adsorption isotherms. They confirm an uniform structure of mesopores in SBA-15, CMK-3 and OCM as well as a more complex structure of mesopores in the MLV materials.