Study of activity and effectiveness factor of noble metal catalysts for water–gas shift reaction

Platinum on ceria-zirconia (CZO) catalysts for the water–gas shift (WGS) reaction were prepared with various platinum loadings. In addition, the activity of Pt/CZO catalysts was tested preliminarily at gas hourly space velocity (GHSV) of 5000 h−1. Activity tests were also conducted at GHSV of 200,000 h−1 with limited conversions, and activation energies and pre-exponential factors for rate equations were obtained by fitting the data. The effectiveness factors were estimated on the basis of the intra-particle mass transfer. Moreover, with this estimation, an attempt was made to calculate the utilization of the Pt loading with an eggshell morphology.