Alloying Ni-Cu Nanoparticles Encapsulated in SiO 2 Nanospheres for Synergistic Catalysts in CO 2 Reforming with Methane Reaction.

In this work, we studied CO 2 reforming with the methane (CRM) reaction over Ni-Cu alloy nanoparticles encapsulated in SiO 2 nanospheres, for which combinational functions of alloy effect, size effect, metal-support interaction, and confinement effect exhibited high performance, good sintering resistance, and trace carbon deposition in CRM. The appropriate Cu-addition catalysts 0.2Cu-Ni@SiO 2 and 0.5Cu-Ni@SiO 2 had smaller NiCu alloy nanoparticles and a stronger metal-support interaction, exhibiting a better performance than the excessive Cu-addition catalysts 1.5Cu-Ni@SiO 2 and 3Cu-Ni@SiO 2 having Cu clusters and a weaker metal-support interaction. The best synergy of alloy effect, size effect, confinement effect, and metal-support interaction in the 0.5Cu-Ni@SiO 2 catalyst contributed to the highest rates of CH 4 and CO 2 in CRM reported so far. This work demonstrates the importance of appropriate Cu addition in Ni-Cu@SiO 2 catalysts, and the synergy for perfectly resolving sintering and carbon deposition in CRM.