Enhanced hydrogen production from biomass via the sulfur redox cycle under hydrothermal conditions
Enhanced hydrogen production from biomass via the sulfur redox cycle under hydrothermal conditions
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DOI：
10.1016/j.ijhydene.2011.06.012
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发表时间：
2011-08
影响因子：
7.2
通讯作者：
P. Setiani;J. Vilcáez;N. Watanabe;Atsushi Kishita;N. Tsuchiya
中科院分区：
文献类型：
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作者：
P. Setiani;J. Vilcáez;N. Watanabe;Atsushi Kishita;N. Tsuchiya
提出了一种中温硫氧化还原循环生物质制氢的新方法。该方法可利用来自烃精炼过程的过量硫和废热或地热，由两个半循环组成：（1）在水的亚临界条件下从碱性水溶液制氢，其中硫化物HS-和S2-充当水的还原剂，和（2）在温和得多的条件下硫化物再生，其中来自生物质的有机化合物充当在前半循环中形成的多硫化物Sn 2 −和硫氧阴离子SxOy 2 −的还原剂。在硫化钠水溶液的60分钟反应期间，在≥280 °C和相应的饱和蒸气压下观察到氢气产生。在本发明的10分钟反应中，在300 °C下产生氢气后向溶液中添加D-葡萄糖C6 H12 O 6导致在≥60 °C的温度下硫化物再生。此外，证明了通过硫氧化还原循环从葡萄糖制氢，其中制氢和硫化物再生分别在300 °C和105 °C下进行。结果表明，在高达500 °C的更高温度下，从1 mol葡萄糖的产氢量大于葡萄糖的水热气化。
A new method of hydrogen production from biomass via a sulfur redox cycle at moderate temperatures has been proposed. This method, which can utilize excess sulfur from hydrocarbon refining processes and waste or geothermal heat, consists of two half cycles: (1) hydrogen production from an aqueous alkaline solution at subcritical conditions of water, where sulfide, HS−and S2−, acts as a reducing agent of water, and (2) sulfide regeneration under much milder conditions, with an organic compound derived from biomass acting as a reducing agent of polysulfide, Sn2−, and sulfur oxyanion, SxOy2−, formed in the first half cycle. During a 60-min reaction of an aqueous sodium sulfide solution, hydrogen production was observed at ≥280 °C and corresponding saturated vapor pressures. Addition of D-glucose, C6H12O6, to the solution after hydrogen production at 300 °C resulted in sulfide regeneration at temperatures ≥60 °C in the present 10-min reaction. Moreover, hydrogen production from glucose via the sulfur redox cycle was demonstrated, where the hydrogen production and sulfide regeneration were conducted at 300 °C and 105 °C, respectively. Results indicated that hydrogen production from 1 mol glucose was greater than that by hydrothermal gasification of glucose at much higher temperatures up to 500 °C.