CO-resistant hydrogenation over noble metal/α-MoC catalyst.

"Hydrogenation by crude H - dehydrogenation to produce pure H" strategy using liquid organic hydrogen carriers (LOHCs) can reduce the cost and shorten the process of hydrogen purification and utilization. The critical challenge is to eliminate catalyst poisoning by CO impurity in crude H. Here, we develop a Pd/α-MoC catalyst that enables efficient hydrogenation of N-LOHCs under crude hydrogen feeds (CO concentration>5 vol%) below 150 °C, and has an activity 1-2 orders of magnitude higher than that of traditional Pd-based catalysts. The CO-resistant hydrogenation is also successfully conducted in the models of industrial crude H including CO, CO and CH. Water, as solvent, contributes greatly to the hydrogenation activity against CO poisoning, since the utilization of low-temperature water gas shift (WGS) reaction. Moreover, the positive-charged Pd species hinder the combination of H* from WGS reaction and suppressed the undesirable H formation and release, which explains the substantial improvement in the performance of Pd/α-MoC compared to that of Pt/α-MoC.