title: Conversion of rice husk ash to zeolite beta.
abstract: White rice husk ash (RHA), an agriculture waste containing crystalline tridymite and alpha-cristobalite, was used as a silica source for zeolite Beta synthesis. The crystallization of zeolite Beta from RHA at 150 degrees C in the presence of tetraethylammonium hydroxide was monitored by XRD, FTIR and (29)Si MAS NMR techniques. It was found that zeolite Beta started to form after 12h and the complete crystallization of zeolite Beta phase was achieved after 2d. XRD, (29)Si MAS NMR and solid yield studies indicate that the transformation mechanism of silica present in RHA to zeolite Beta involves dissolution of the ash, formation of an amorphous aluminosilicate after 6h of crystallization, followed by dissolution in the mother liquor and final transformation to pure zeolite Beta crystals.
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor, Malaysia.
authors.forename: Didik
authors.initials: D
authors.lastname: Prasetyoko
authors.forename: Zainab
authors.initials: Z
authors.lastname: Ramli
authors.forename: Salasiah
authors.initials: S
authors.lastname: Endud
authors.forename: Halimaton
authors.initials: H
authors.lastname: Hamdan
authors.forename: Bogdan
authors.initials: B
authors.lastname: Sulikowski
mesh_terms: D003460:Crystallization / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D012275:Oryza / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D019789:Tetraethylammonium; D014866:Waste Products / Q000032:analysis*; D014961:X-Ray Diffraction; D017641:Zeolites / Q000737:chemistry*
chemical_list: D014866:Waste Products; D017641:Zeolites; D019789:Tetraethylammonium; D012822:Silicon Dioxide