Synthesis of ZSM-5 zeolite from coal fly ash and rice husk: characterization and application for partial oxidation of methane to methanol

International Symposium on Current Progress in Functional Materials

Krisnandi, Y.K.^1 ; Yanti, F.M.^1,2 ; Murti, S.D.S.^2

Department of Chemistry, Faculty of Mathematics, Natural Sciences Universitas Indonesia, Kampus UI Depok, Depok

16424, Indonesia^1

Agency for Assessment and Application of Technology, Jl. M.H Thamrin 8, Jakarta, Indonesia^2

关键词: Coal fly ash;    Heterogeneous catalyst;    Hydrothermal treatments;    Impregnation methods;    Partial oxidation of methane;    Partial oxidations;    Rice husk ash;    Surface area analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/188/1/012031/pdf
DOI  :  10.1088/1757-899X/188/1/012031

来源: IOP

【 摘 要 】

Indonesian fly ash (SiO2/Al2O3mole ratio = 3.59) was used together with rice husk (SiO292%) as raw material for mesoporous ZSM-5 zeolite synthesis. Prior being used, coal fly ash and rice husk were subjected to pre-treatment in order to extract silicate (SiO44-) and aluminate (AlO45-) and to remove the impurities. Then the ZSM-5 zeolite were synthesized through hydrothermal treatment using two types of templates (TPAOH and PDDA). The as-synthesized ZSM-5 was characterized using FTIR, XRD, SEM-EDX, and BET. The result of FTIR showed peaks at 1250-950 cm-1(vasymetricT-O), 820-650 cm-1(vsymetricT-O), and at 650-500 cm-1confirming the presence of the five number ring of the pentasil structure. The result of XRD showed the appearance of certain peaks in the position 2 theta between 7-9° and 22-25° indicative of ZSM-5 structure, but also showed the pattern of low intensity magnetite and hematite. The SEM image showed the rough surface of hexagonal crystals from ZSM-5 structure, indicative of mesoporosity in the structure. EDX result showed Si/Al ratio of 20, while surface area analysis gave SA of 43.16. The ZSM-5 zeolites then was modified with cobalt oxide through impregnation method. The catalytic activity as heterogeneous catalysts in partial oxidation of methane was tested. The result showed that hence the catalytic activity of ZSM-5 and Co/ZSM-5 from fly ash and rice husk were still inferior compared to the pro-analysis sourced-counterpart, they were potential to be used as catalyst in the partial oxidation of methane to methanol.