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   Immobilizing Phosphotungstic Acid on Al2o3-Zno Nano Mixed Oxides As A Heterogeneous Catalyst For Biodiesel Production By the Esterification of Free Fatty Acids  
   
نویسنده Gilvari Tazkieh ,Aghabarari Behzad ,Pazouki Mohammad
منبع Journal Of Renewable Energy And Environment - 2019 - دوره : 6 - شماره : 3 - صفحه:1 -6
چکیده    This study investigated the esterification reaction of different carboxylic acids (acetic acid, palmitic acid, and oleic acid) and ethanol by zno, al2o3-zno mixed oxide, and phosphotungestic acid (10 wt %) immobilized on the al2o3-znomixed oxide. the heterogeneous catalysts were characterized by xrd, bet, fe-sem, and edx techniques. optimum yield was achieved by using 10 % hpw/al2o3-zno as the best catalyst, and the effects of the amount of catalyst, molar ratio of acid to alcohol, reaction temperature, and time were investigated to ensure the ideal yield of esterification reaction of acetic acid and ethanol. the results showed that the esterification of acetic acid to its ethyl ester was carried out in 3.5 hours, with an alcohol-to-acid-molar ratio of 2 and a temperature of 80 ˚c with yield 98 %. moreover, the 10 % hpw/al2o3-zno catalyst showed well activity in biodiesel production by the esterification of palmitic and oleic acids and the reaction yield did not decrease with an increase in alkyl chain length in acid molecules, remarkably.
کلیدواژه Biodiesel ,Esterification ,Al2o3-Zno Nano Mixed Oxides ,Phosphotungestic Acid
آدرس Materials And Energy Research Center, Department Of Nanotechnology And Advanced Materials, Iran, Materials And Energy Research Center, Department Of Nanotechnology And Advanced Materials, Iran, Materials And Energy Research Center (Merc), Department Of Energy, Iran
پست الکترونیکی mpazouki@merc.ac.ir
 
     
   
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