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Hydrogen production from steam reforming of acetic acid over Pt–Ni bimetallic catalysts supported on ZrO2
Biomass & Bioenergy ( IF 5.8 ) Pub Date : 2021-11-26 , DOI: 10.1016/j.biombioe.2021.106317
Isabella C.A. Souza 1 , Robinson L. Manfro 1 , Mariana M.V.M. Souza 1
Affiliation  

Acetic acid, a model compound of bio-oil, was chosen to investigate the H2 production from steam reforming reaction using Pt and Ni catalysts supported on ZrO2. Ni crystallite sizes decreased with addition of Pt (from 23 to 15 nm), increasing the metallic dispersion (from 4.4 to 6.5%). A spillover effect was identified in bimetallic catalysts and caused a significant decrease of Ni reduction temperature. Although the Ni crystallite size in 15Ni/ZrO2 is larger, it showed 100% of conversion and the highest H2 yield (about 30%) during 30 h of reaction at 500 °C. In contrast to what was expect, the performance of bimetallic catalysts was not so good when compared to the monometallic Ni catalyst. 5Pt15Ni/ZrO2 and 1Pt15Ni/ZrO2 showed about 20% of H2 yield at the end of reaction. 1Pt/ZrO2 presented the worst catalytic performance; it produced more acetone, which can be correlated to its higher acidity, and deactivated very fast, with the highest coke formation rate. Coke was predominantly amorphous for all catalysts.



中文翻译:

ZrO2负载Pt-Ni双金属催化剂上乙酸蒸汽重整制氢

乙酸,生物油的模型化合物,被选为调查ħ 2从使用支撑在的ZrO Pt和Ni催化剂的蒸汽重整反应生产2。Ni 微晶尺寸随着 Pt 的加入而减小(从 23 到 15 nm),增加了金属色散(从 4.4 到 6.5%)。在双金属催化剂中发现了溢出效应,并导致 Ni 还原温度显着降低。尽管 15Ni/ZrO 2 中的 Ni 微晶尺寸较大,但在 500 °C 反应 30 小时内显示出 100% 的转化率和最高的 H 2产率(约 30%)。与预期相反,与单金属 Ni 催化剂相比,双金属催化剂的性能并没有那么好。5Pt15Ni/ZrO 21Pt15Ni/ZrO 2在反应结束时显示出约20%的H 2产率。1Pt/ZrO 2的催化性能最差;它产生更多的丙酮,这可能与其较高的酸度有关,并且失活非常快,焦炭形成率最高。对于所有催化剂,焦炭主要是无定形的。

更新日期:2021-11-26
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