A new hydrogen storage system based on efficient reversible catalytic hydrogenation/dehydrogenation of terphenyl

摘要

Noble metal catalysts on mesoporous SiO_2 and modified carbon supports were found to enhance the activities of terphenyl (TPh) hydrogenation and tercyclohexane (TCH) dehydrogenation without side reactions, such as cracking, hydrogenolysis, ring opening and/or coke formation. The noble metal catalysts could be used for a reversible hydrogen storage system. Five percent Pt/SiO_2 catalyst was highly active in TCH dehydrogenation without stirring, due to an easier diffusion of organic molecules to the small catalyst particles during dehydrogenation. In view of a long-term stability in TPh hydrogenation and TCH dehydrogenation, a catalyst with relatively low Pt content on the oxidized graphite coal (Sibunit-ox) was the most promising for a hydrogen storage system because Pt agglomeration on the support was found to be much less than Pd agglomeration in the Pd/Sibunit-ox catalyst.