Preparation of carbon molecular sieve membrane derived from phenolic resin over macroporous clay-alumina based support for hydrogen separation

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• 作者：Sanjukta Roy ; Rakhi Das ; Mahesh Kumar Gagrai ; Sandeep Sarkar
• 关键词：Carbon molecular sieve ; Hydrogen separation ; Clay ; alumina ; Phenol formaldehyde novolac resin
• 刊名：Journal of Porous Materials
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：23
• 期：6
• 页码：1653-1662
• 全文大小：1,269 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Characterization and Evaluation Materials
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1573-4854
• 卷排序：23

文摘

An asymmetric carbon membrane was prepared by coating alcoholic solution of industrial grade phenol formaldehyde novolac resin (PFNR) directly over indigenously prepared macroporous clay-alumina based ceramic support without using any microporous intermediate layer. The initial three coatings of 40 wt% PFNR solution was carried out using vacuum assisted dip coating method followed by fourth coating of same solution by normal dip coating method and final fifth coating of 60 wt% PFNR solution also by normal dip coating method. After each coating, the coated support was air dried in room temperature for 24 h and was subjected to pinhole test with nitrogen gas, failing which the coating process was repeated. The finally coated support was carbonized at 780 °C in nitrogen atmosphere to obtain a layer of carbon molecular sieve membrane (CMSM) over the support. FESEM and EDX analysis confirmed the formation of CMSM membrane directly over the support. HK method of pore size analysis revealed the presence of ultramicropores in the range of 4Å–8Å in the prepared CMSM. Single gas permeation test through the CMSM showed that it exhibits selectivities of 9.00, 14.28 and 10.21 for H₂/N₂, H₂/CO₂ and H₂/CH₄ systems respectively with H₂ permeability of 27 × 10−9 mol.m−2.s−1.Pa−1.