Aqueous-phase reforming of model compounds of wet biomass to hydrogen on alumina-supported metal catalysts

IF 1.5 4区 化学 Q4 CHEMISTRY, PHYSICAL
Rohini S. Zambare, Prakash D. Vaidya
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Abstract

Catalytic aqueous-phase reforming (APR) of wet biomass such as microalgae and activated sludge is a potential technique for the production of H2-rich gaseous products. In the present work, model compounds such as ethylene glycol, xylose and alanine were selected as representatives of the polyols, carbohydrates and proteins in wet biomass. APR trials were performed in a stirred batch reactor using commercial Pt/Al2O3 and Ru/Al2O3 catalysts. The reforming reactions were investigated at different conditions: temperature (T), 498 to 518 K, feed concentration, 1 to 5 wt. %, catalyst loading (ω), 2 to 6 kg/m3, and reaction time (t), 1 to 6 h. The commercial Pt/Al2O3 catalyst exhibited higher reforming activity. The influence of reaction parameters on turnover frequency (TOFH₂), hydrogen yield (Y-H2) and carbon-to-gas conversion (C to G conversion) was studied. The values of TOFH₂ for Pt/Al2O3 were measured at T = 518 K, ω = 2 kg/m3 and t = 3 h using 1 wt% feed and these values were 19.2, 4 and 6 1/min for ethylene glycol, xylose and alanine. The values of TOFH₂ over Ru/Al2O3 under identical conditions were: ethylene glycol–12.4, xylose–1.4 and alanine–5.4 1/min. The activation energies for H2 production from ethylene glycol, xylose and alanine over Pt/Al2O3 and Ru/Al2O3 catalysts were determined. APR of the mixture of model compounds was also studied over laboratory-made Pt/Al2O3 and Ru/Al2O3 catalysts at the optimum reaction conditions. Thus, this work has provided crucial insights into the production of H2 from model compounds of wet biomass using Al2O3-supported catalysts.

湿生物质模型化合物在氧化铝支撑金属催化剂上的水相转化制氢过程
对微藻类和活性污泥等湿生物质进行催化水相重整(APR)是一种生产富含 H2 气体产品的潜在技术。本研究选择了乙二醇、木糖和丙氨酸等模型化合物作为湿生物质中多元醇、碳水化合物和蛋白质的代表。使用商用 Pt/Al2O3 和 Ru/Al2O3 催化剂在搅拌间歇反应器中进行了 APR 试验。研究了不同条件下的重整反应:温度 (T),498 至 518 K;进料浓度,1 至 5 wt.%;催化剂负载 (ω),2 至 6 kg/m3;反应时间 (t),1 至 6 h。研究了反应参数对翻转频率(TOFH₂)、氢气产率(Y-H2)和碳-气转化率(C-G 转化率)的影响。在 T = 518 K、ω = 2 kg/m3 和 t = 3 h 条件下,使用 1 wt% 进料测量了 Pt/Al2O3 的 TOFH₂值,乙二醇、木糖和丙氨酸的 TOFH₂值分别为 19.2、4 和 6 1/min。在相同条件下,Ru/Al2O3 的 TOFH₂值分别为:乙二醇-12.4、木糖-1.4 和丙氨酸-5.4 1/min。测定了在 Pt/Al2O3 和 Ru/Al2O3 催化剂上乙二醇、木糖和丙氨酸产生 H2 的活化能。在最佳反应条件下,还研究了在实验室制造的 Pt/Al2O3 和 Ru/Al2O3 催化剂上混合模型化合物的 APR。因此,这项工作为利用 Al2O3 支持的催化剂从湿生物质的模型化合物中制取 H2 提供了重要的见解。
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来源期刊
CiteScore
3.30
自引率
6.70%
发文量
74
审稿时长
3 months
期刊介绍: As the leading archival journal devoted exclusively to chemical kinetics, the International Journal of Chemical Kinetics publishes original research in gas phase, condensed phase, and polymer reaction kinetics, as well as biochemical and surface kinetics. The Journal seeks to be the primary archive for careful experimental measurements of reaction kinetics, in both simple and complex systems. The Journal also presents new developments in applied theoretical kinetics and publishes large kinetic models, and the algorithms and estimates used in these models. These include methods for handling the large reaction networks important in biochemistry, catalysis, and free radical chemistry. In addition, the Journal explores such topics as the quantitative relationships between molecular structure and chemical reactivity, organic/inorganic chemistry and reaction mechanisms, and the reactive chemistry at interfaces.
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