A comparative study on the catalytic performance of different types of zeolites for biodiesel production

摘要: Abstract Microporous zeolites (BEA type Beta zeolite and MFI ZSM-5 zeolite) micro-mesoporous (MFI ZRP-5 with various Si/A1 ratios were employed in the esterification of oleic acid ethanol. The effect pore size on internal mass transfer limitation was investigated by Thiele modulus calculation. results showed that high Si/Al had better catalytic performance, these three at same ratios, exhibited lowest limitations but worst performance. Through comparison Eley–Rideal model Langmuir–Hinshelwood model, it indicated surface hydrophilic zeolites, adsorption polar ethanol molecules more favorable than molecules, resulting less coverage lower conversion rate esterification. Moreover, Cassie–Baxter water capacity test used to further validate assumption kinetic model. highest 73.6% achieved when reaction catalyzed hydrophobic (50) under optimized conditions molar ratio 1:20, catalyst loading 0.167 meq/g (oleic acid), temperature 78.0 °C, time 10.0 h stirring speed 600 rpm. remained above 70.0% after five runs there no apparent loss active component (Al) from zeolite.