3 years ago

Influence of support on physicochemical properties of ZrO2 based solid acid heterogeneous catalysts for biodiesel production

Marwa M. Ibrahim, Hala R. Mahmoud, Sahar A. El-molla

Publication date: Available online 8 January 2019

Source: Catalysis Communications

Author(s): Marwa M. Ibrahim, Hala R. Mahmoud, Sahar A. El-Molla

Abstract

Environmental pollution control is the challenge area of heterogeneous catalysts to avoid the use of harmful materials in chemical synthesis. So ZrO2-based solid acid catalysts were prepared and used in environmental applications like production of biodiesel. ZrO2 loading on different supports (Al2O3, Fe2O3, TiO2 and SiO2) prepared by a hybrid sol-gel auto combustion methods. The structural, surface and acidity properties are studied. The catalytic activity was evaluated by production of biodiesel through conversion of stearic acid to ester. ZrO2/ SiO2 has the highest conversion rate because of a high surface area and a high number of Lewis acid sites. Under the optimal reaction conditions of alcohol/ acid molar ratio 12:1, mass ratio of catalyst to acid 0.1, reaction time 3 h and reaction temperature 120 °C, the conversion rate reached 48.6%. Moreover, the catalysts reused over at least five runs without significant loss of activity.

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