Heterogeneous alkaline earth metal–transition metal bimetallic catalysts for synthesis of biodiesel from low grade unrefined feedstock

• Published in: RSC advances Vol. 5; no. 102; pp. 83748 - 83756
• Main Authors: Kwong, Tsz-Lung, Yung, Ka-Fu
• Format: Journal Article
• Language: English
• Published: 2015
• Subjects: Analysis of variance; Bimetals; Biodiesel; Catalysis; Catalysts; Earth; Feedstock; Synthesis
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C5RA13819A

A bimetallic alkaline earth metal–transition metal oxide, synthesized through a method of direct low-temperature decomposition of the bimetallic complex, is reported for the synthesis of biodiesel. Due to the high phase purity of the Ca/Fe catalytic system and its catalytic stability and robustness, the Ca/Fe catalyst was selected for further investigation. A transesterification conversion of 99.5% could be achieved in 1 h under the optimal conditions: feedstock to methanol, 1 : 20; catalyst loading, 6 wt%; temperature, 120 °C. ANOVA tests suggested that the reaction temperature was discerned as the most prominent factor which contributed 82.84% to the overall catalytic feedstock conversion. In addition, the Ca/Fe catalytic system demonstrated a high FFA tolerance of 2 wt% and a water tolerance of 1 wt% with remarkable catalytic activity in one-step biodiesel synthesis.