Alkylamine-silica hybrid membranes for carbon dioxide/methane separation

Souha Belhaj Messaoud, Atsushi Takagaki, Takashi Sugawara, Ryuji Kikuchi, S. Ted Oyama

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Hybrid membranes are promising materials for the purification of natural gas from carbon dioxide. The present paper investigates the effect of the incorporation of primary and secondary amine functional groups on the performance of an organic-inorganic hybrid silica membrane for CO2/CH4 separation. Hybrid membranes were synthesized by chemical vapor deposition using 3-aminopropyltrimethoxysilane and (3-methylaminopropyl)trimethoxysilane as primary and secondary alkylamine-silica precursors, respectively. The amino functionalized membranes were compared to an amine-free membrane prepared using propyltrimethoxysilane as precusor. The amine-free membrane had a pore size of 0.37nm, and at 393K a CO2 permeance of 2.1×10-8molm-2s-1Pa-1 and a CO2/CH4 selectivity of 4. The primary amine membrane had a pore size of 0.36 nm, and at 393K displayed a CO2 permeance of 2.1×10-8molm-2s-1Pa-1 and a CO2/CH4 selectivity of 70. The secondary amine hmembrane had a pore size of 0.43nm and achieved a CO2 permeance of 1.3×10-7molm-2s-1Pa-1 and a CO2/CH4 selectivity of 140. The pore sizes were estimated by Tsuru's method. The transport mechanism of CO2 throughout the amino-silica hybrid membranes was surface diffusion. The secondary amino-silica hybrid membrane was stable for 60h under a relative humidity of 20%.

Original languageEnglish
Pages (from-to)161-171
Number of pages11
JournalJournal of Membrane Science
Volume477
DOIs
Publication statusPublished - Mar 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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