WGS reaction empirical kinetics over novel potassium promoted ZnAlLa mixed oxides catalyst

• Published in: Chemical engineering research & design 2020-12, Vol.164, p.293-298
• Main Authors: Antoniak-Jurak, Katarzyna, Kowalik, Paweł, Michalska, Kamila, Franczyk, Ewelina, Mrozek, Anna
• Format: Article
• Language: English
• Subjects: Ammonia; Catalysts; Cr-free catalyst; Empirical kinetics; High temperature; Kinetic equations; Kinetics; Mixed oxides; Power law; Power law equation; Reaction kinetics; Synthesis gas; Temperature; Water–gas shift
• ISSN: 0263-8762; 1744-3563
• DOI: 10.1016/j.cherd.2020.09.031

•Experimental investigation of water–gas shift reaction over K-ZnAlLa catalyst under realistic process conditions.•WGS rate data collected at diffusion regime using gradientless reactor.•Power-law type rate equation developed for temperature 300–400°C and pressure ca. 2.5MPa. A new empirical kinetics of novel catalyst for high temperature water–gas shift (HT-WGS) at the pressure of 2.5MPa was developed in the study. Using gradientless reactor a set of kinetics data for catalyst in form of 5×5mm tablet operating at diffusion regime was collected, studied and fitted to classic power-law kinetic equation. Simple power-law equation fits the experimental data with sufficient accuracy. The reaction with respect to CO is close to first order and the apparent activation energy of ca. 51.5kJmol−1. The equation is believed to be applicable to modeling of HT-WGS at the temperature in the range of 300–400°C and the pressure ca. 2.5MPa corresponding to synthesis gas production for ammonia and methanol plants.