Abstract The selective hydrogenolysis of glycerol to 1,3-propanediol is a highly important reaction for both improving the profitability of biodiesel and valorization of biomass. While intensive research efforts have been devoted to enhancing the catalytic activity and selectivity, little is focused on the stability although the latter is of paramount importance to practical applications. In this work, we investigated the stability of Pt/WO3/Al2O3 and observed a continuous deactivation trend during a 700 h time-on-stream run. Neither the leaching of active W nor the coking was responsible for the deactivation. Instead, XRD, HAADF-STEM and CO chemisorption results clearly showed the occurrence of significant aggregation of Pt particles, which caused a remarkable decrease of Pt-WOx interfacial sites. As a consequence, strong Bronsted acid sites which were in situ formed by H2 dissociation at the Pt-WOx interfacial sites were reduced, leading to the deactivation of the catalyst.

中文翻译：

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了解 Pt/WO3/Al2O3 催化剂在甘油氢解反应中的失活行为

摘要 甘油选择性氢解为 1,3-丙二醇是提高生物柴油盈利能力和生物质价值的重要反应。虽然密集的研究工作致力于提高催化活性和选择性，但很少关注稳定性，尽管后者对实际应用至关重要。在这项工作中，我们研究了 Pt/WO3/Al2O3 的稳定性，并在 700 小时的运行时间中观察到了连续的失活趋势。活性 W 的浸出和焦化都不是失活的原因。相反，XRD、HAADF-STEM 和 CO 化学吸附结果清楚地表明 Pt 颗粒发生显着聚集，导致 Pt-WOx 界面位点显着减少。作为结果，