Abstract: Aiming at the problems of complex preparation process, poor mass and heat transfer performance, low mechanical strength, and insufficient resistance to coking and sulfur poisoning of existing diesel reforming catalysts, porous NiCu-based catalysts were prepared based on selective laser melting 3D printing technology. An active oxide layer rich in lattice oxygen was introduced onto the porous catalyst surface through high-temperature oxidation treatment, achieving one-step forming of structurally and functionally integrated diesel reforming porous catalysts. Performance evaluation results showed that, compared with air high-temperature oxidation treated samples, oxygen high-temperature oxidation could effectively improve the reforming activity and stability of the catalyst samples. Under the conditions of 800 °C and a steam-to-carbon molar ratio of 4.9:1, the sample treated by oxygen high-temperature oxidation achieved a diesel conversion of 99.61% and a hydrogen yield of 68.71% in catalyzing diesel steam reforming reaction, with excellent catalyst stability. Characterization results from XRD, SEM-EDS, and XPS revealed that the (002) crystal facet of CuO has a special atomic arrangement and electronic structure, which is a highly catalytically active facet that can selectively promote the adsorption and activation of diesel component molecules and accelerate the diesel reforming reaction. The lattice oxygen in the oxide layer can participate in the oxidation-reduction cycle reaction on the catalyst surface, timely removing surface coke deposits and maintaining catalyst activity.

Key words: reforming catalyst, clean utilization of diesel, 3D printing, structural-functional integration, lattice oxygen, crystal facet, oxidation-reduction cycle reaction