Hydrogen separation by ceramic membranes in coal gasification

Technical Report · Thu Apr 30 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/6913877· OSTI ID:6913877

Gavalas, G R

Project Objectives are to develop hydrogen-permselective ceramic membranes for water-gas shift membrane-reactor suitable for hydrogen production from coal gas and evaluate the technical and economic potential of the membrane-reactor. During the reporting period exploratory experiments begun on a membrane preparation technique aimed at providing higher membrane permeance. The new preparation technique involves two stages. The first stage is the formation of a layer of silica gel by a two-phase interfacial reaction within the pores of the substrate. The gel is then dried and calcined yielding a microporous (pore diameter below 10 [Angstrom]) silica layer within the pores of the substrate tube. The second stage involves one-sided chemical vapor deposition using the SiCl[sub 4]-H[sub 2]O reaction to close up the micropores of the gel layer and produce the final hydrogen permselective membrane. Chemical reactions involved are described.

• Research Organization: California Inst. of Tech., Pasadena, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-90MC26365
• OSTI ID: 6913877
• Report Number(s): DOE/MC/26365-3173; ON: DE93006198
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
08 HYDROGEN
080107* -- Hydrogen-- Production-- Coal Gasification
36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL REACTION KINETICS
CHEMICAL VAPOR DEPOSITION
CHLORIDES
CHLORINE COMPOUNDS
COAL GASIFICATION
COLLOIDS
DEPOSITION
DISPERSIONS
DOCUMENT TYPES
FABRICATION
GASIFICATION
GELS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN PRODUCTION
KINETICS
MEMBRANES
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PROGRESS REPORT
REACTION KINETICS
SEPARATION PROCESSES
SILICON CHLORIDES
SILICON COMPOUNDS
SILICON HALIDES
SILICON OXIDES
SURFACE COATING
THERMOCHEMICAL PROCESSES