Synthesis and characterization of a silica-alumina composite membrane and its application in a membrane reactor

Naoki Kageyama, Atsushi Takagaki, Takashi Sugawara, Ryuji Kikuchi, S. Ted Oyama

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Hydrothermally stable silica-alumina composite membranes were synthesized through chemical vapor deposition (CVD) of tetraethylorthosilicate (TEOS) and aluminium tri-sec-butoxide precursor at 923 K on porous alumina supports. The membranes showed high hydrogen permselectivity (order of 10−7 mol m−2 s−1 Pa−1) comparable to that of pure silica membranes but with superior hydrothermal stability, and were used in a membrane reactor. The permeation of small gas species (H2, He, Ne) was well explained by a solid-state diffusion mechanism, involving jumps of the permeating species between solubility sites. The permeation mechanism of large gas molecules (CH4, CO2, N2) was explained by the gas translation mechanism involving large pore defects. Steam methane reforming (SMR) on a Ni/MgO-SiO2 catalyst was carried out at 923 K in the membrane reactor and in a conventional packed-bed reactor. The membrane contributed to an increase in the hydrogen production rate by the selective extraction of hydrogen from the reaction zone.

Original languageEnglish
Pages (from-to)437-445
Number of pages9
JournalSeparation and Purification Technology
Volume195
DOIs
Publication statusPublished - Apr 29 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation

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