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Open AccessArticle

Waste Seashells as a Highly Active Catalyst for Cyclopentanone Self-Aldol Condensation

College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology—Shandong Academy of Sciences, No. 3501, Daxue Road, Jinan 250353, China
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Catalysts 2019, 9(8), 661;
Received: 29 July 2019 / Accepted: 31 July 2019 / Published: 1 August 2019
For the first time, waste-seashell-derived CaO catalysts were used as high-performance solid base catalysts for cyclopentanone self-condensation, which is an important reaction in bio-jet fuel or perfume precursor synthesis. Among the investigated seashell-derived catalysts, Scapharca Broughtonii-derived CaO catalyst (S-shell-750) exhibited the highest dimer yield (92.1%), which was comparable with commercial CaO (88.2%). The activity sequence of different catalysts was consistent with the CaO purity sequence and contact angle sequence. X-ray diffraction (XRD) results showed that CaCO3 in waste shell were completely converted to CaO after calcination at 750 °C or above for 4 h. CO2 temperature-programmed desorption (CO2-TPD) results indicate that both the amount and strength of base sites increase significantly when the calcination temperature climbs to 750 °C. Therefore, we can attribute the excellent performance of S-shell-750/850/950 catalysts to the higher CaO content, relatively low hydrophilicity, and stronger acidity and basicity of this catalyst. This study developed a new route for waste shell utilization in bio-derived ketone aldol condensation. View Full-Text
Keywords: biomass; waste seashell; aldol condensation; heterogeneous catalyst biomass; waste seashell; aldol condensation; heterogeneous catalyst
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Sheng, X.; Xu, Q.; Wang, X.; Li, N.; Jia, H.; Shi, H.; Niu, M.; Zhang, J.; Ping, Q. Waste Seashells as a Highly Active Catalyst for Cyclopentanone Self-Aldol Condensation. Catalysts 2019, 9, 661.

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