Synthesis of Silicotungstic Acid/Ni-Zr-O Composite Nanoparticle by Using Bimetallic Ni-Zr MOF for Fatty Acid Esterification

Abstract

In this study, the bimetallic Ni-Zr MOF-derived nickel-zirconium oxide (Ni-Zr-O)-impregnated silicotungstic acid (HSiW) nanocomposite catalyst (HSiW@Ni-Zr-O) was prepared via a hydrothermal procedure followed by a pyrolysis treatment, and its structural, morphological, and surface components and oxidation states were characterized by using XRD, FTIR, TPD-NH3, SEM, TEM, N2 physisorption, and XPS analyses. Then, the nanocomposite catalysts were successfully applied to the esterification of oleic acid (OA) with methanol. According to its characteristics, the obtained HSiW@Ni-Zr-O-1 catalyst would generate larger pores, a higher acidity, and active interfaces at the calcining temperature of 300 °C. Therefore, HSiW@Ni-Zr-O-1 exhibits an excellent catalytic activity of 95.2% under optimal reaction conditions. Additionally, the catalyst can be reused with a good catalytic activity after nine cycles. This study highlights the opportunity of using bimetallic MOFs as precursors to the synthesis of highly nanoporous metal oxide, which supports the larger-industrial scale production of biofuels.

Impact of ultrasonic mixing on virgin and waste vegetable oils for biodiesel production

“…It was shown that use of electrostatic coagulation yielded significant reductions in the time required to fully separate the biodiesel and glycerin, as compared to gravitational settling. Gashaw and Teshita (2014) demonstrated that transesterification of oils having higher free fatty acid content was difficult when an alkaline base catalyst was used, and this often resulted in soap formation (Huang et al, 2023), used transesterification with an in situ extraction of product to produce a more efficient biodiesel yield (Mahmoodi et al, 2019;Zhang et al, 2022). Acknowledged the need for esterification/transesterification of FFA for different oils using heterogenous or homogenous catalysis.…”

Facile Preparation of Bimetallic MOF-derived Supported Tungstophosphoric Acid Composites for Biodiesel Production

“…In general, biodiesel is derived by esterification/transesterification of free fatty acids (FFAs), plant oils, animal fats, waste cooking oils, and microalgae and triglyceride with short-chain alcohols in the presence of homogeneous/heterogeneous catalysts [5]. Although the usage of homogeneous catalysts can achieve a high percentage of conversion rates, it also causes some salient problems such as expensive separation stages and large amounts of chemical wastewater [6]. Therefore, heterogeneous catalysts have just been developed for various applications due to their less hazardous, ease of separation, and recyclability [7][8][9].…”