Facet Effect of Ceria Nanoparticles on Platinum Dispersion and Catalytic Activity of Methanol Partial Oxidation

The effect of platinum–supported nano–shaped ceria catalysts on methanol partial oxidation and methyl formate product selectivity has been investigated. Pt supported on a CeO2 nanocube catalyst had higher turnover frequency...

Improved low-temperature catalytic oxidation performance of Pt-based catalysts by modulating the electronic and size effects

The electronic effect between PVA and platinum could be modulated though reaction time, restraining the chain movement and affecting the platinum dispersion, both of which closely affects the low-temperature performance of the Pt-based catalyst.

Effect of Microwave Drying, Calcination and Aging of Pt/Al2O3 on Platinum Dispersion

The effect of heating method employed for drying and calcination during the synthesis of 1 wt% Pt/Al2O3 catalyst was investigated. Conventional heating (CH) in resistive oven and microwave heating (MW) in single mode were applied, and the Pt dispersion and Brunauer-Emmett-Teller (BET) surface area were measured to characterize the samples. It was evidenced that the fast and homogeneous heating offered by the microwave heating led to higher Pt dispersion. However, this benefit was only achieved when the subsequent calcination was performed in a conventional oven. The aging in microwave oven of conventionally prepared—as well as MW-prepared—catalysts demonstrated the great ability of microwave irradiation to accelerate platinum sintering. After 1 h at 800 °C under microwave, catalysts showed a dispersion of 5%. Therefore, microwave treatment should be considered for accelerated catalyst aging but should be avoided as a calcination technique for the synthesis of highly dispersed Pt/Al2O3.

Al(CH3)3-promoted Pt/MCM-41 catalysts for tetralin hydrogenation in the presence of benzothiophene and promotion mechanism of Al-promoted Pt/MCM-41 catalysts

High platinum dispersion benefits tetralin hydrogenation and sulfur tolerance. Sulfur tolerance is also favourable for electron deficient Ptδ+.