Hydrogen production by glycerol reforming in supercritical water over Ni/MgO-ZrO_2 catalyst  

作　　者：Qihai Liu Liewen Liao Zili Liu Xinfa Dong 

机构地区：[1]School of Chemistry and Chemical Engineering,Zhongkai University of Agriculture and Engineering [2]School of Chemistry and Chemical Engineering,Guangzhou University [3]School of Chemistry and Chemical Engineering,South China University of Technology

出　　处：《Journal of Energy Chemistry》2013年第4期665-670,共6页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation (21076047 and 21276054);the Natural Science Foundation of Zhongkai University of Agriculture and Engineering (G3100026)

摘　　要：Nano ZrO2 and MgO-ZrO2 were prepared by a self-assembly route and were employed as the support for Ni catalysts used in hydrogen production from glycerol reforming in supercritical water （SCW）. The reforming experiments were conducted in a tubular fixed-bed flow reactor over a temperature range of 600-800 ℃. The influences of process variables such as temperature, contact time, and water to glycerol ratio on hydrogen yield were investigated and the catalysts were charactered by ICP, BET, XRD and SEM. The results showed that high hydrogen yield was obtained from glycerol by reforming in supercritical water over the Ni/MgO-ZrO2 catalysts in a short contact time. The MgO in the catalyst showed significant promotion effect for hydrogen production likely due to the formation of the alkaline active site. Even when the glycerol feed concentration was up to 45 wt%, glycerol was completely gasified and transfered to the gas products containing hydrogen, carbon dioxide, and methane along with small amounts of carbon monoxide. At a diluted feed concentration of 5 wt%, near theoretical yield of 7 mole of H2/mol of glycerol could be obtained.Nano ZrO2 and MgO-ZrO2 were prepared by a self-assembly route and were employed as the support for Ni catalysts used in hydrogen production from glycerol reforming in supercritical water （SCW）. The reforming experiments were conducted in a tubular fixed-bed flow reactor over a temperature range of 600-800 ℃. The influences of process variables such as temperature, contact time, and water to glycerol ratio on hydrogen yield were investigated and the catalysts were charactered by ICP, BET, XRD and SEM. The results showed that high hydrogen yield was obtained from glycerol by reforming in supercritical water over the Ni/MgO-ZrO2 catalysts in a short contact time. The MgO in the catalyst showed significant promotion effect for hydrogen production likely due to the formation of the alkaline active site. Even when the glycerol feed concentration was up to 45 wt%, glycerol was completely gasified and transfered to the gas products containing hydrogen, carbon dioxide, and methane along with small amounts of carbon monoxide. At a diluted feed concentration of 5 wt%, near theoretical yield of 7 mole of H2/mol of glycerol could be obtained.

关 键 词：hydrogen production glycerol remforming supercritical water MgO modification Ni/ZrO2 catalysts 

分 类 号：TQ116.2[化学工程—无机化工]