Abstract

Hydrogen storage and transportation by chemicals like formic acid (FA) is an important strategy for the suitable application of hydrogen as a green fuel. In the present study, the application of bimetallic Pd/Au catalysts supported on KIT-6 mesoporous silica for catalytic decomposition of formic is investigated. The effect of calcination temperature as well as Au:Pd ratio in Au–Pd/KIT-6 catalysts on FA dehydrogenation reaction in the aqueous media was studied. Among the catalysts used, Au₁–Pd₁₇/KIT-6 which calcined at 350 °C by having 0.2% Au and 0.27% Pd, showed the best activity by releasing a total gas volume of 142 mL. The sample was exposed to oxygen fellow for activation before the FA decomposition reaction. The optimum reaction conditions were 1 mL FA (98%), 1 mL sodium formate (1 M), and 65 °C. The results showed the calcination temperature plays a critical role in the catalytic activity of these bimetallic catalysts. Also, it was confirmed that both the metal-support and the metal–metal interactions are responsible for production of hydrogen from formic acid. The physicochemical properties of samples were analyzed by various techniques such as SEM, XRD, ICP-EOS, nitrogen adsorption–desorption, and FT-IR spectroscopy. The selected catalyst was regenerated and reused for four successive runes.

中文翻译：

---

Au-Pd/KIT-6 催化剂对甲酸分解的催化活性：煅烧温度和 Pd:Au 组成的研究

摘要

通过甲酸（FA）等化学物质储存和运输氢是氢作为绿色燃料的适当应用的重要策略。在本研究中，研究了KIT-6介孔二氧化硅负载的双金属Pd/Au催化剂在催化分解甲酸中的应用。研究了煅烧温度以及 Au-Pd/KIT-6 催化剂中 Au:Pd 比例对水介质中 FA 脱氢反应的影响。在所使用的催化剂中，含有0.2％Au和0.27％Pd的Au ₁ –Pd ₁₇ /KIT-6在350℃下煅烧，表现出最好的活性，释放的气体总量为142 mL。在 FA 分解反应之前，将样品暴露于氧气中进行活化。最佳反应条件为 1 mL FA (98%)、1 mL 甲酸钠 (1 M)、65 °C。结果表明，煅烧温度对这些双金属催化剂的催化活性起着至关重要的作用。此外，还证实金属-载体和金属-金属相互作用都导致甲酸产生氢气。通过SEM、XRD、ICP-EOS、氮气吸附-脱附和FT-IR光谱等多种技术分析了样品的物理化学性质。选定的催化剂被再生并重新用于四个连续的符文。