Surface modification of macroporous Al2O3 tubes with carbon-doped TiO2 intermediate layer and preparation of highly permeable palladium composite membranes for hydrogen separation |
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Authors: | Lei Wei Maixia Ma Yanhong Lu Dongsheng Wang Suling Zhang Qian Wang |
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Affiliation: | 1. College of Chemistry and Materials Science, Langfang Normal University, Langfang, P.R. Chinah2weilei@sina.com;3. College of Chemistry and Materials Science, Langfang Normal University, Langfang, P.R. China |
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Abstract: | ABSTRACTTo prepare H2-permeable palladium composite membranes, a novel carbon-doped microporous TiO2 intermediate layer was introduced to modify the surface of macroporous Al2O3 substrates. The Pd/TiO2–C/Al2O3 membrane was prepared via electroless plating, and thereafter, carbon residue in the intermediate layer was removed by calcination in air, yielding a Pd/TiO2/Al2O3 membrane. Experimental results indicate that the carbon residue shrinks the pore size of the intermediate layer and facilitates a decrease of membrane defects. Additionally, carbon removal induces a higher effective membrane area at the permeate side, which enhances hydrogen permeability. Furthermore, the apparent activation energy (EA) and stability of the as-prepared Pd/TiO2/Al2O3 membrane were investigated. |
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Keywords: | Hydrogen separation palladium composite membrane macroporous substrate carbon-doped intermediate layer effective membrane area |
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