Pd-based CO 2 hydrogenation catalysts are more watertolerant than those based on Cu. Nevertheless, these systems favor the reverse water-gas shift reaction and produce significant amounts of carbon monoxide. It has been shown that the selectivity to the desired methanol product can be increased by alloying Pd with a second metal, such as Zn or Ga. Therefore, alloy materials offer a promising strategy for improving the performance of CO 2 hydrogenation catalysts.