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| Preparation of magnetic solid acid catalyst from walnut peel and its catalytic activity in synthesis of biodiesel |
| LIU Xiao-hong1, LI Tian-tian1, ZENG Xian-lai2 |
1. School of Chemistry & Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan′an University, Yan′an 716000, China;
2. School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract Considering the bottom-up strategy, the magnetic carbonaceous solid acid catalyst was prepared by walnut green peel which was deemed to be an agricultural waste, meanwhile it was analyzed by BET, XRD, SEM, IR and TGA. The obtained results showed that synthesized magnetic solid acid catalyst has fluffy structure, high specific surface area and favorable thermal-stability. The catalyst of MPCs-0.2-SO3H has played an important role in the synthesis of biodiesel. In a situation where the molar ratio of ethanol to oleic acid is 30, the dosage of magnetic solid acid catalyst is 7% oleic acid weight, the esterification rate can reach 74.2% after 8 h reaction at 80℃,which is superior to commercial Amberlyst-15of nearly 20%. Moreover, it still has high esterification rate after repeated use 3times, high water resistance of 4% weight of oleic acid. Therefore, walnut peel had been reused and synthesized magnetic catalyst, which was easy to be separated and demonstrated a prominent application potential in the preparation of biodiesel.
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Received: 20 June 2018
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