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Valorization of alginate for the production of hydrogen via catalytic aqueous phase reforming
Catalysis Today ( IF 5.3 ) Pub Date : 2017-10-07 , DOI: 10.1016/j.cattod.2017.09.047
Giuseppe Pipitone , Davide Tosches , Samir Bensaid , Alessandro Galia , Raffaele Pirone

Alginate, a carbohydrate abundant in the outer cell wall of macroalgae, was subjected to catalytic aqueous phase reforming (APR) to produce hydrogen using a 3% Pt/C commercial catalyst. The performance of the process was evaluated according to the conversion of the carbon to gas, the hydrogen yield and the hydrogen selectivity. The catalyst and feed amount, temperature, reaction time, pH and the presence of H2 were modified to understand the dependence of the outcome of the process on these parameters. The presence of the catalyst was fundamental in order to increase the hydrogen yield compared to the uncatalyzed reaction, and it can be reused without activity loss. In addition, it was observed that the increase in alginate loading led to a decreasing conversion of the carbon; the yield of hydrogen increases with the increasing temperature and the basic pH had a strong beneficial effect in terms of selectivity. The plateau appeared after 2 h was attributed to the low kinetic tendency of the intermediate compounds to produce hydrogen. The study validated what is present in literature for simpler molecules, moving at the same time towards a more complex feed, closer to a possible industrial application.



中文翻译:

通过催化水相重整对藻酸盐进行重整以制氢

使用3%Pt / C商业催化剂,对藻类(大型藻类细胞壁中丰富的碳水化合物)进行催化水相重整(APR),以产生氢气。根据碳到气体的转化率,氢产率和氢选择性来评估该方法的性能。催化剂和进料量,温度,反应时间,pH和H 2的存在进行了修改,以了解过程结果对这些参数的依赖性。与未催化反应相比,催化剂的存在是提高氢产率的基础,它可以重复使用而不会损失活性。此外,观察到藻酸盐负载量的增加导致碳的转化率降低;氢气的产率随温度的升高而增加,碱性pH在选择性方面具有很强的有益作用。2小时后出现平稳现象的原因是中间化合物产生氢的动力学趋势较低。这项研究验证了文献中有关简单分子的研究成果,同时向更复杂的进料方向发展,使其更接近于可能的工业应用。

更新日期:2017-10-07
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