Abstract
This work presents the comparative physicochemical and catalytic studies of metal oxide MgO catalysts in a transesterification reaction. The influence of the Si/Al ratio in the catalytic material on their catalytic properties in the studied process was extensively evaluated. In addition, the effect of the type of zeolite ZSM-5 form on the catalytic reactivity of MgO based catalysts was investigated. In order to achieve the main goals of this work, a series of MgO/ZSM-5 catalysts were prepared via the impregnation method. Their physicochemical properties were studied using X-ray diffraction (XRD), BET, FTIR and TPD-CO2 methods. The highest activity in the studied process exhibited MgO catalyst supported on ZSM-5 characterized by the highest ratio between silica and alumina. The most active catalyst system in the transesterification reaction was 10% MgO/ZSM-5 (Si/Al = 280), which showed the highest value of higher fatty acid methyl esters (94.6%) and high yield of triglyceride conversion (92.9%). The high activity of this system is explained by the alkalinity, sorption properties in relation to methanol and its high specific surface area compared to the rest of the investigated MgO based catalysts.
Highlights
Accepted: 15 October 2021The increase in the number of people along with changes in lifestyle and rapid industrialization causes a continuous increase in energy demand in recent years [1,2,3]
Magnesium oxide catalysts supported on ZSM-5 zeolites and oxide supports were prepared by an impregnation method and all materials were tested in biodiesel production reaction in order to select the best catalytic system
The physicochemical properties were tested by BET, CO2 -TPD, FTIR and X-ray diffraction (XRD)
Summary
Accepted: 15 October 2021The increase in the number of people along with changes in lifestyle and rapid industrialization causes a continuous increase in energy demand in recent years [1,2,3]. A significant part of this demand is satisfied by the consumption of natural resources, the availability of which is increasingly limited, and their constant use may eventually lead to their depletion [1]. One solution to these problems is biodiesel, which is a liquid, renewable, clean alternative fuel that has received a lot of attention due to oil depletion and environmental concerns [2,4,5,6].
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