Synthesis of Pt-based LDH-Derived Nanoplatelets for catalytic decalin dehydrogenation

H₂ recycling between naphthalene, tetralin and decalin can be a promising application in chemical hydrogen storage, which is an important area for hydrogen fuel cell applications. Pt-based catalysts can be used in the dehydrogenation reaction for this purpose and support modification can effectively improve the catalytic performance. Effects of preparation method, Mg/Al molar ratio and metal composition on the Pt-based LDH-derived nanoplatelets catalysts for decalin dehydrogenation were systematically investigated in this work. The results out of this study indicated that the preparation method, Mg/Al molar ratio and metal composition exert significant effects on the microstructure and catalytic performance of the catalysts for decalin dehydrogenation. The Pt/MgAl-LDO catalyst with a Mg/Al molar ratio of 4 prepared by hydrothermal method yielded the largest specific surface area of 374 m²/g and the smallest average Pt particle size of 1.62 nm, which exhibited excellent H₂ production yield of 5.94 mol/g_Pt. These are mainly attributed to the sheet-like structure, large specific surface area and strong Pt-support interaction, leading to the superior Pt dispersion. This work provides a new approach for the preparation of low-cost and high-performance decalin dehydrogenation catalysts, which is of great significance for the application of liquid-phase organic hydride hydrogen storage technology.