リチウムシリケートペレットを用いたCO_2吸収型非平衡改質によるエタノールからの水素製造

概要

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Equilibrium shifting is considered to be effective for promoting H_2 production by ethanol (C_2H_5OH) steam reforming. In this study, a packed bed reactor with a mixture of reforming catalyst and CO_2 absorbent was used. Lithium silicate (Li_4SiO_4) was applied as the absorbent, which Toshiba has developed. In the case of Li_4SiO_4, CO_2 emission occurs at considerably lower temperature than in the case of the well-known calcium oxide (CaO) and the reaction between Li_4SiO_4 and CO_2 is highly reversible. This is a report of the equilibrium-shift effect on steam reforming of C_2H_5OH, which was obtained by using Li_4SiO_4 pellet (ca.5mm). Experiments showed obvious effect, which resulted in keeping not only the concentration of H_2 at 99.3dry vol% but also that of CO at 0.11dry vol% for 0.5hour. This result indicates the possibility of dispensing with a CO-shift reactor and simplifying either CO removal reactor or purification apparatus, in the case of a reformer using a packed bed of pellets. We believe that it would improve the conventional H_2 production system.
一般社団法人日本エネルギー学会の論文
2008-01-20