TY - JOUR
T1 - Process intensification of the rWGS reaction by a perovskite-based catalyst
AU - Markowitsch, Christoph
AU - Andritz, Marion
AU - Lindenthal, Lorenz
AU - Cotter, Thomas
AU - Drexler, Hedda
AU - Rameshan, Christoph
AU - Lehner, Markus
PY - 2024/10/10
Y1 - 2024/10/10
N2 - The reverse water gas shift (rWGS) reaction represents a key technology for the utilization of CO2. This study presents experimental results which compare the performance of a commercially available nickel catalyst, two novel perovskite catalysts and Al2O3. In addition to the variations of the input gas composition, the operating conditions have been adjusted between 550 and 950 °C and 1 to 8 bara. The results reveal, on the one hand, that the nickel catalyst achieves thermodynamic equilibrium, resulting in high selectivity toward CO formation at elevated temperatures (950 °C) and pressures up to 6 bara. Higher catalyst loads suppress methane formation at certain operating points. On the other hand, the perovskite catalyst prevents methane formation even at low temperature (550 °C) and higher pressures up to 8 bara favor the CO formation. In consequence, methane formation is limited to less than 2 vol-% at 650 °C and 8 bara and the CO content in the product gas is significantly higher compared with the nickel catalyst. Al2O3 also shows catalytic activity and approaches to thermodynamic equilibrium at high temperature (950 °C) and 6 bara. The investigated novel perovskite catalysts have the potential to intensify the rWGS reaction towards a simpler reactor design and a highly efficient operation, also on a large-scale basis.
AB - The reverse water gas shift (rWGS) reaction represents a key technology for the utilization of CO2. This study presents experimental results which compare the performance of a commercially available nickel catalyst, two novel perovskite catalysts and Al2O3. In addition to the variations of the input gas composition, the operating conditions have been adjusted between 550 and 950 °C and 1 to 8 bara. The results reveal, on the one hand, that the nickel catalyst achieves thermodynamic equilibrium, resulting in high selectivity toward CO formation at elevated temperatures (950 °C) and pressures up to 6 bara. Higher catalyst loads suppress methane formation at certain operating points. On the other hand, the perovskite catalyst prevents methane formation even at low temperature (550 °C) and higher pressures up to 8 bara favor the CO formation. In consequence, methane formation is limited to less than 2 vol-% at 650 °C and 8 bara and the CO content in the product gas is significantly higher compared with the nickel catalyst. Al2O3 also shows catalytic activity and approaches to thermodynamic equilibrium at high temperature (950 °C) and 6 bara. The investigated novel perovskite catalysts have the potential to intensify the rWGS reaction towards a simpler reactor design and a highly efficient operation, also on a large-scale basis.
KW - Reverse water gas shift (rWGS)
KW - Catalyst performance
KW - Nickel catalyst
KW - Perovskite catalysts
KW - rWGS process intensification
U2 - 10.1016/j.cej.2024.156577
DO - 10.1016/j.cej.2024.156577
M3 - Article
SN - 1385-8947
VL - 500.2024
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
IS - 15 November
M1 - 156577
ER -