This study investigates the comparative structure–function relationships of Ni/zeolite composites, Ni–X (X = CaA, NaX, CaX, NaY, ZSM-5, MOR, and clinoptilolite (CL)), for syngas production via dry reforming of methane (DRM). Particular attention is paid to the influence of zeolite framework topology, cationic composition, textural characteristics, and surface acid–base properties on catalytic performance under identical experimental conditions.
Characterization of a representative sample by XRD and SEM/EDX demonstrated the successful incorporation of nickel into the composite while maintaining the zeolite framework. In contrast to studies focused on individual zeolite systems, this work presents a comparative evaluation of Ni/zeolite catalyst representing a wide range of framework types, thus providing a robust basis for identifying structure–function relationships and their quantitative trends. The quantitative correlations identified between zeolite structure and the principal catalytic performance parameters for Ni/zeolites systems based on A-, X-, and Y-type, together with the higher activity of the narrow-pore Ni–CaA and Ni–CL catalysts, demonstrate the important role of framework topology in determining catalytic performance. Furthermore, analysis of the relationship between catalytic performance and surface acid–base properties highlighted the contribution of Lewis acidic and basic sites.
The work examines both structure–function relationships across different zeolite topologies and catalytic changes induced within the same framework type by physicochemical modification. Clinoptilolite-based catalysts demonstrated promising performance: acid activation of clinoptilolite enabled controlled tuning of the SiO2/Al2O3 ratio, porosity, and surface acidity, leading to enhanced catalytic behavior. Overall, the catalytic performance of Ni-zeolite systems in DRM is governed by the interaction between framework structure, pore accessibility, cationic composition, and surface acid-base properties.
Jafarova Sevil Tagi