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论文类型：期刊论文

发表时间：2015-01-01

发表刊物：CHEMSUSCHEM

收录刊物：SCIE、EI、PubMed

卷号：8

期号：2

页面范围：288-300

ISSN号：1864-5631

关键字：biomass; diffusion layers; electrochemistry; fuel cells; hydrogenation

摘要：For the first time, the hydrophobicity design of a diffusion layer based on the volatility of hydrogenation reactants in aqueous solutions is reported. The hydrophobicity of the diffusion layer greatly influences the hydrogenation performance of two model biomass derivatives, namely, butanone and maleic acid, in polymer electrolyte membrane reactors operated at atmospheric pressure. Hydrophobic carbon paper repels aqueous solutions, but highly volatile butanone can permeate in vapor form and achieve a high hydrogenation rate, whereas, for nonvolatile maleic acid, great mass transfer resistance prevents hydrogenation. With a hydrophilic stainless-steel welded mesh diffusion layer, aqueous solutions of both butanone and maleic acid permeate in liquid form. Hydrogenation of maleic acid reaches a similar level as that of butanone. The maximum reaction rate is 340 nmolcm(-2) s(-1) for both hydrogenation systems and the current efficiency reaches 70%. These results are better than those reported in the literature.