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 experim...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.展开更多
目的利用响应面分析法对柑橘皮渣/淀粉基材料加工工艺进行优化。方法在单因素实验基础上选取试验因素与水平,设计响应面试验进行挤出工艺优化,通过考察成形材料的膨胀率、表观性能和压缩强度,筛选出具有较好发泡效果和一定压缩性能的材...目的利用响应面分析法对柑橘皮渣/淀粉基材料加工工艺进行优化。方法在单因素实验基础上选取试验因素与水平,设计响应面试验进行挤出工艺优化,通过考察成形材料的膨胀率、表观性能和压缩强度,筛选出具有较好发泡效果和一定压缩性能的材料成形工艺配方。结果甘油和水分含量对柑橘皮渣/淀粉基复合发泡材料的成形具有显著影响。柑橘皮渣/淀粉基复合发泡材料的最佳工艺优化参数为皮渣、甘油、水分质量分数分别为30%,30%,35%。在此参数条件下得到的材料其表观密度为0.942 g/cm3,膨胀率为287.82%,压缩强度为210.58 k Pa。结论利用响应面法分析并优化柑橘皮渣/淀粉基材料加工工艺的方法可行,获得的响应面模型可用于预测真实值。展开更多
基金supported by the National Natural Science Foundation (21076047 and 21276054)the Natural Science Foundation of Zhongkai University of Agriculture and Engineering (G3100026)
文摘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.
文摘目的利用响应面分析法对柑橘皮渣/淀粉基材料加工工艺进行优化。方法在单因素实验基础上选取试验因素与水平,设计响应面试验进行挤出工艺优化,通过考察成形材料的膨胀率、表观性能和压缩强度,筛选出具有较好发泡效果和一定压缩性能的材料成形工艺配方。结果甘油和水分含量对柑橘皮渣/淀粉基复合发泡材料的成形具有显著影响。柑橘皮渣/淀粉基复合发泡材料的最佳工艺优化参数为皮渣、甘油、水分质量分数分别为30%,30%,35%。在此参数条件下得到的材料其表观密度为0.942 g/cm3,膨胀率为287.82%,压缩强度为210.58 k Pa。结论利用响应面法分析并优化柑橘皮渣/淀粉基材料加工工艺的方法可行,获得的响应面模型可用于预测真实值。
