Exploring the Characteristics of Mesoporous Configuration through Strategic Synthesis of Bifunctional Hierarchical Co/ZSM-5 Catalyst Irena Khatrin (a,b), Iman Abdullah (a,b), Yuni Krisyuningsih Krisnandi (a,b*)
a) Department of Chemistry, Faculty of Mathematics and Natural Sciences Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
b) Solid Inorganic Framework Laboratory, Department of Chemistry, Faculty of Mathematics and Natural Sciences Universitas Indonesia, Depok 16424, Indonesia
*yuni.krisnandi[at]sci.ui.ac.id
Abstract
A certain synthesis method of hierarchical zeolite leads to the creation of specific mesoporous types in the framework, intra-crystalline or inter-crystalline mesoporous. To provide insights into the distinctive characteristics of mesoporous types, hierarchical ZSM-5 zeolites were synthesized through two different methods: a hydrothermal method and a template-free method at low temperatures. The as-synthesized hierarchical ZSM-5 zeolites were then modified into a bifunctional catalyst of Co-oxides/ZSM-5 via impregnation method with the variation of metal loading (wt.%). The characterization of the catalysts was carried out using FT-IR, XRD, SEM, and N2 physisorption. XRD patterns show that as-modified Co-oxides on the ZSM-5 surface presented in the form of Co3O4 and the bifunctionality of Co-oxides catalysts was further suggested by FT-IR spectra. Debye-Scherrer analysis of XRD patterns confirmed the SEM results that ZSM-5 synthesized through the low-temperature method resulted in lower particle size (nano-size). N2 physisorption analysis also confirmed the enhanced distribution of Co-oxides of ZSM-5 low-temperature why distributed on the surface as indicated by the absence of surface area reduction after the impregnation process. Therefore, it can be concluded that ZSM-5 with the mesoporous configuration of intra-crystalline and inter-crystalline mesoporous could be synthesized through the hydrothermal and low-temperature method, respectively, with their distinctive characteristics.
