The dehydrogenation of liquid hydrocarbon fuel is a potential endothermic reaction for the regenerative cooling of advanced aircraft. The high active and stable dehydrogenation catalyst plays a vital role in the catalytic heat exchangers. Herein, we show that a CaO-modified TiO2-Al2O3 supported Pt catalyst (Pt/CTA) is efficient and stable for the dehydrogenation of cycloalkanes (methylcyclohexane and decalin) under a very harsh reaction condition (600.0 oC, 4.0 MPa and WHSV = 100-200 h-1). The addition of the appropriate amount of CaO (5 wt%) improves the catalyst durability. The characterization analyses demonstrate that the addition of CaO facilitates the formation of oxygen vacancy defects, thereby increasing the electron density of Pt particles and partially encapsulation layers of TiOx species (SMSI). The electron-rich Pt particles surface tends to weaken the adsorption of reactants and coke precursors, resulting in higher dehydrogenation activity and catalytic stability. The enhanced SMSI plays a key role in increasing the dispersion of Pt particles and prevents them from sintering under harsh reaction conditions. In addition, the addition of CaO reduces the acid amount and weakens the acidity strength of TiO2/Al2O3, which then inhibits catalyst deactivation by mitigating coke formation. However, excessive CaO addition (10 wt%) rapidly decreases the surface area of the support, resulting in poor dispersion and severe sintering of Pt particles, ultimately leading to poor catalytic activity and stability.

Efficient and stable Pt/CaO-TiO2-Al2O3 for the catalytic dehydrogenation of cycloalkanes as an endothermic hydrocarbon fuel

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