Ramli, Zainab and Prasetyoko, Didik and Endud, Salasiah (2002) Friedel-Crafts Acylation Of Anisole Catalysed By H-Zeolite Beta Of Crystalline Rice Husk Ash. Jurnal Teknologi C, 36 (C). pp. 41-54. ISSN 0127-9696
The reactivity of H-Beta zeolite, synthesised directly from crystalline rice husk ash in various SiO2/Al2O3 gel ratios, was studied in the Friedel-Crafts acylation of anisole with propionic anhydride. Reactions were carried out in a batch reactor at various times and reaction temperatures in order to obtain the optimum acylation condition. Products identified by gas chromatography showed that p-methoxypropiophenone is the main product with propionic acid as the main side product. Hbeta catalyst from the SiO2/Al2O3 = 27 gel ratio gave the highest activity, with anisole conversion of 88.9% and product selectivity toward p-ethoxypropiophenone of 75.3%. The optimum acylation condition was taken at 100Â°C reaction temperature in 4 hour reaction. Study showed that acylation reaction follows the electrophilic aromatic substitution mechanism catalysed by BrÃ¸nsted acid sites of H-Beta zeolite.
|Uncontrolled Keywords:||zeolite beta, rice husk ash, Friedel-Crafts acylation, anisole|
|Subjects:||Q Science > QD Chemistry|
|Deposited By:||En Mohd. Nazir Md. Basri|
|Deposited On:||02 Mar 2007 07:31|
|Last Modified:||01 Jun 2010 02:53|
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