Nanocrystalline zeolites as cracking catalysts in the production of biofuel from used palm oil.
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Date
2011-01
Authors
Listyorini, Niken Taufiqurrahmi
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Zeolit berkristal nano dengan saiz kristal yang lebih kecil daripada 100 nm merupakan bahan yang berpotensi menggantikan mangkin zeolit yang ada disebabkan luas permukaan yang lebih besar dan batas resapan yang rendah. Nanokristalin zeolit ZSM-5 (MFI), nanokristalin zeolit Y (FAU) dan nanokristalin zeolit beta (BEA) dengan kaedah hidroterma disediakan dalam kajian ini. Zeolit yang telah disintesis telah dicirikan menggunakan belauan sinar-X (XRD), analisis permukaan (penyerapan-penyahserapan N2), mikroskopi elektron imbasan (SEM), mikroskopi elektron transmisi (TEM), dan penyahjerapan pengaturcara suhu ammonia (TPD). Keputusan XRD zeolit nanokristal dengan pantulan yang diperluas dan puncak intensiti yang lebih rendah dengan menunjukkan adanya kristal kecil. Kristal zeolit di dalam julat 50-100 nm telah dikesan daripada analisis SEM. Saiz nano kristal zeolit telah menghasilkan luas permukaan yang besar.
Nanocrystalline zeolites with a crystal size smaller than 100 nm are the potential materials replacing the existing zeolite catalysts due to their larger surface area and less diffusion limitations. Nanocrystalline zeolite ZSM-5 (MFI), nanocrystalline zeolite Y (FAU) and nanocrystalline zeolite beta (BEA) were synthesized in the present study under hydrothermal conditions. The synthesized zeolites were characterized by X-ray diffraction (XRD), Surface analysis (adsorption-desorption Nitrogen), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Temperature-Programmed Desorption (TPD) of ammonia. Nanocrystalline zeolites show in their XRD results, broadening of the reflections and shorter peak intensity indicating the presence of small crystals. The zeolite crystal size was in range 50-100 nm as observed from SEM. The nano size of zeolite crystals resulted in large surface area.
Description
Keywords
Nanocrystalline , Catalysts