Influence of adding Zr0.5Ti0.5O2 on the performance of supercritical cracking catalyst for RP-3

Abstract

Zr0.5Ti0.5O2 was prepared by co-precipitation and tested for its catalytic performance under supercritical conditions when mixed with a CeO2-Al2O3 (CA) base catalyst. The catalysts were characterized with an automatic adsorption instrument (BET method), X-ray diffraction (XRD), transmission electron microscopy (TEM), and temperature programmed desorption (TPD). It was found that Zr0.5Ti0.5O2 significantly lowered the temperature of the cracking reaction, and increased the thermal cracking gas rate by a factor of 2.8 times as large as that at 600 °C for the CAbase catalyst. The gas rate was increased by a factor of 4.0 times when it was doped into the CAbase catalyst, and the heat sink increased by 0.55 MJ·kg-1 over that of thermal cracking at 650 °C. BET results show that the Zr0.5Ti0.5O2-doped CAbase catalyst has a double-pore structure that enhances ethylene selectivity. NH3-TPD result indicates that the acidity of the catalyst increased by 4.0 times, indicating improved surface acidity conducive to alkene generation. © Editorial office of Acta Physico-Chimica Sinica.