期刊论文详细信息
Materials
Diffusion Study by IR Micro-Imaging of Molecular Uptake and Release on Mesoporous Zeolites of Structure Type CHA and LTA
Mauricio Rincon Bonilla4  Tobias Titze4  Franz Schmidt1  Dirk Mehlhorn4  Christian Chmelik4  Rustem Valiullin4  Suresh K. Bhatia2  Stefan Kaskel1  Ryong Ryoo3 
[1] Department of Inorganic Chemistry, Dresden University of Technology, Bergstrasse 66, 01069 Dresden, Germany; E-Mails:;School of Chemical Engineering, University of Queensland, Brisbane QLD 4072, Australia; E-Mail:;Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea; E-Mail:;Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany; E-Mails:
关键词: mesoporous zeolites;    IR micro-imaging;    diffusion;    surface barriers;    NaCaA;    SAPO-34;    paraffins;    olefins;   
DOI  :  10.3390/ma6072662
来源: mdpi
PDF
【 摘 要 】

The presence of mesopores in the interior of microporous particles may significantly improve their transport properties. Complementing previous macroscopic transient sorption experiments and pulsed field gradient NMR self-diffusion studies with such materials, the present study is dedicated to an in-depth study of molecular uptake and release on the individual particles of mesoporous zeolitic specimens, notably with samples of the narrow-pore structure types, CHA and LTA. The investigations are focused on determining the time constants and functional dependences of uptake and release. They include a systematic variation of the architecture of the mesopores and of the guest molecules under study as well as a comparison of transient uptake with blocked and un-blocked mesopores. In addition to accelerating intracrystalline mass transfer, transport enhancement by mesopores is found to be, possibly, also caused by a reduction of transport resistances on the particle surfaces.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.

【 预 览 】
附件列表
Files Size Format View
RO202003190035108ZK.pdf 1216KB PDF download
  文献评价指标  
  下载次数:4次 浏览次数:43次