Advancing Platinum-Based Catalysts for Efficient Hydrogen Release from Liquid Organic Hydrogen Carriers

The rising global energy demand and the pressing requirement to decrease greenhouse gasemissions require the creation of sustainable and effective energy storage systems. Hydrogen, due to its substantial energy density and widespread availability, emerges as a highly promising environmentally friendly fuel. Nevertheless, the preservation of this substance presents notable difficulties because of its low density and elevated reactivity. This thesis investigates the enhancement of platinum (Pt)-based catalysts supported on different substrates to improve the efficiency of hydrogen release from liquid organic hydrogen carriers (LOHCs). The specific focus is on indoline, tetrahydroquinoline, tetrahydroisoquinoline, 6-methyl-tetrahydroquinoline, and 12H-N-ethylcarbazole (12HNEC).An investigation was conducted on the synthesis, characterisation, and catalytic performance ofPt/Al2O3, Pt/TiO2, and Pt/SiO2 catalysts. The direct impregnation approach was used to achieve a 0.2 wt% platinum loading on the supports. The resultant catalysts were studied using transmission electron microscopy (TEM) and inductively coupled plasma mass spectrometry (ICP-MS). The investigation determined that Pt/Al2O3 demonstrated the highest efficiency in releasing hydrogen. This can be due to the even distribution and distinctive cuboctahedron shape of the Pt particles on the surface of the substrate. This catalyst exhibited a hydrogen release efficiency of around 5%, which was notably superior to that of Pt/TiO2 and Pt/SiO2.12HNEC had the greatest effectiveness as a liquid organic hydrogen carrier (LOHC), releasingaround 5% of hydrogen when dehydrogenated with Pt/Al2O3. The improved hydrogen release ability of 12HNEC compared to other examined compounds can be attributed to its structural and morphological benefits, as well as its interaction with the highly-dispersed Pt particles.This study highlights the crucial importance of carefully choosing the material on which achemical reaction takes place and designing an effective catalyst in order ...