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Title: CO2-selective, Hybrid Membranes by Silation of Alumina

Hybrid membranes are feasible candidates for the separation of CO2 from gas produced in coal-based power generation since they have the potential to combine the high selectivity of polymer membranes and the high permeability of inorganic membranes. An interesting method for producing hybrid membranes is the silation of an inorganic membrane. In this method, trichloro- or alkoxy-silanes interact with hydroxyl groups on the surface of γ-AlO3 or TiO2, binding organic groups to that surface. By varying the length of these organic groups on the organosilane, it should be possible to tailor the effective pore size of the membrane. Similarly, the addition of “CO2-phillic” groups to the silating agent allows for the careful control of surface affinity and the enhancement of surface diffusion mechanisms. This method of producing hybrid membranes selective to CO2 was first attempted by Hyun [1] who silated TiO2 with phenyltriethoxysilane. Later, Way [2] silated γ-AlO3 with octadecyltrichlorosilane. Both researchers were successful in producing membranes with improved selectivity toward CO2, but permeability was not maintained at a commercially applicable level. XPS data indicated that the silating agent did not penetrate into the membrane pores and separation actually occurred in a thin “polymer-like” surface layer. The present study attemptsmore » to overcome the mass transfer problems associated with this technique by producing the desired monolayer coverage of silane, and thus develop a highly-permeable CO2-selective hybrid membrane.« less
Authors:
;
Publication Date:
OSTI Identifier:
925510
Report Number(s):
DOE/NETL-IR-2003-167
TRN: US200809%%640
DOE Contract Number:
None cited
Resource Type:
Conference
Resource Relation:
Conference: 20th Annual International Pittsburgh Coal Conference, Pittsburgh, PA, Sept. 15-19, 2003; Related Information: PDF includes the slide presentation, although the title on it (CO2-Selective Hybrid Membranes by Silation of γ-Alumina) varies from the cited title.
Publisher:
University of Pittsburgh, SWANSON School of Engineering, Pittsburgh, PA
Research Org:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV
Sponsoring Org:
USDOE - Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; AFFINITY; COAL; DIFFUSION; MASS TRANSFER; MEMBRANE PORES; MEMBRANES; PERMEABILITY; POLYMERS; POWER GENERATION; X-RAY PHOTOELECTRON SPECTROSCOPY