In conclusion, the study by Wang et al. represents a significant contribution to the field of metal-zeolite bifunctional catalysis, offering a simple and efficient synthesis methods to obtain the ultra-small Ni particle zeolite-based catalyst. They also revealed that the pre ageing of the catalysts in hydrogen or nitrogen was the crucial factor, which enabled Ni²⁺ to interact with silanol nests on the zeolite before the metal salts were broken down. This resulted in the formation of ultra-small nanoparticles in the metallic state. The findings have the potential to influence future research and development in this area, and it will be interesting to see how these ultra-small nickel nanoparticles can be further optimized and applied in other catalytic systems.