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Low‐Cost Catalysts for the Water Gas Shift Reaction Based on Cu–Ni on La‐Promoted Ceria
Author(s) -
PoggioFraccari Eduardo,
Rozenblit Abigail,
Mariño Fernando
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800048
Subject(s) - chemistry , catalysis , water gas shift reaction , proton exchange membrane fuel cell , anode , inorganic chemistry , hydrogen purifier , selectivity , metal , thermal decomposition , chemical engineering , hydrogen production , electrode , organic chemistry , engineering
Proton‐exchange membrane fuel cells are of great interest for vehicular applications. A highly pure, sustainably obtained H 2 stream is desirable to use as the cell feed. In the water gas shift (WGS) process, large amounts of CO, which is a poison for the cell anode, are removed from a bioalcohol‐derived H 2 stream before it enters the cell. In this study, Cu–Ni catalysts supported on La‐doped ceria were analyzed and studied in the WGS reaction. The supports were prepared by the urea thermal decomposition method with different percentages of La as a promoter of ceria. The metal phase was incorporated by incipient wet impregnation. Many characterization techniques were employed in this work (BET, XRD, SEM, ICP, TPR, OSC), and the relationship between the resulting properties and catalytic performance was investigated to determine the effect of La. A mixture of Cu and Ni was found to be the most effective active phase, having considerable activity and selectivity towards the desired reaction. Low degrees of La doping in ceria enhance oxygen mobility in the lattice. A commercial Ce salt containing La as its main impurity (ca. 2 %) is a convenient precursor, given its good performance and low cost compared to a high‐purity salt.