Hydrogen production from supercritical water reforming of glycerol in an empty Inconel 625 reactor

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• 作者：Thirasak Pairojpiriyakul ; Worapon Kiatkittipong ; Suttichai Assabumrungrat ; Eric Croiset
• 关键词：Hydrogen production ; Glycerol reforming ; Reactions in supercritical water ; Inconel 625 reactor
• 刊名：International Journal of Hydrogen Energy
• 出版年：2 January, 2014
• 年：2014
• 卷：39
• 期：1
• 页码：159-170
• 全文大小：1882 K

文摘

Glycerol reforming was investigated under supercritical water conditions (450-575聽掳C, 250聽bar). A feed containing 5聽wt.% of glycerol was continuously fed to an empty Inconel 625 reactor. The products of the reaction were separated into gas and liquid phases in a condenser. At a feed rate of 2.15聽g/min, the glycerol conversion significantly increased from 0.05 to 0.97 when increasing operating temperature from 450 to 575聽掳C. Although lowering the feed rate (i.e. increasing the residence time) could considerably improve the conversion, carbon formation became a problem especially at high operating temperatures (550-575聽掳C). The major gaseous products were hydrogen (approximately 60聽mol%), carbon monoxide, carbon dioxide and methane with some traces of ethane, ethylene, propane, and propylene. Various liquid products were detected including acetaldehyde, acetol, methanol, acetic acid, propionaldehyde, allyl alcohol, acetone, acrolein, ethanol, ethylene glycol, and acrylic acid but the major liquid components were acetaldehyde and acetol. With a feed glycerol concentration of 2.5聽wt.% and operating temperature of 525聽掳C, glycerol conversion of 0.91 and H₂ yield of 2.86 can be obtained without carbon formation. Finally, it was demonstrated that higher H₂ yield with much lower carbon formation was observed in supercritical water reforming (250聽bar) compared to conventional steam reforming at 1聽bar under similar temperatures.