Xiaobo Chen

Establishment of Kinetic Model for Catalytic Pyrolysis of Daqing Atmospheric Residue

An 8-lump kinetic model was proposed to predict the yields of propylene, ethylene and gasoline in the catalytic pyrolysis process of Daqing atmospheric residue. The model contains 21 kinetic parameters and one for catalyst deactivation. A series of experiments were carried out in a riser reactor over catalyst named LTB-2. The kinetic parameters were estimated by using sub-model method, and apparent activation energies were calculated according to the Arrhenius equation. The predicted yields coincided well with the experimental values. It shows that the kinetic parameters estimated by using the sub-model method were reliable.

Insights into the effect of surface functional groups on catalytic performance for hydrogen generation from sodium borohydride

Sodium borohydride hydrolysis to generate hydrogen has great potential for mobile and portable applications, and designing efficient catalysts for this reaction is indispensable. In this work, the effect of surface functional groups on hydrogen generation rate (HGR) is investigated using two polystyrene resin supported Pt catalysts. The first type of resin (resin-NH) contains –N(CH3)3OH and abundant –OH groups, while the other one (resin-SH) contains –SO3H and less –OH. After excluding the influences of basicity and Pt loading, it is found that the Pt/resin-NH catalyst exhibits a much higher HGR and lower activation energy compared with the Pt/resin-SH catalyst. Moreover, multiple techniques such as FT-IR, XRD, TEM and XPS are further employed to elucidate the intrinsic mechanism. Compared with the –SO3H group, the –N(CH3)3OH and –OH groups not only facilitate Pt dispersion by enhancing metal–support interaction but also improve the electronic conductivity during hydrolysis by forming electron-enriched Pt active sites.