Biodiesel production from used palm cooking oil in the presence of bifunctional γ-Al2O3-KOH supported catalysts

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Biodiesel production from used palm cooking oil in the

presence of bifunctional γ-Al2O3-KOH supported

catalysts

Xu Ziming, Wenfu Tong, Yu Haiy, Xu Bin

To cite this version:

Biodiesel production from used palm cooking oil in the presence of

bifunctional γ-Al

O

-KOH supported catalysts

Xu Ziming, Wenfu Tong, Yu Haiy, Xu Bin

School of Food and Biological Engineering, Jiangsu University, Zhenjiang Jiangsu 212013 Biodiesel has been identified as a promising substitute for diesel derived from petroleum. Both edible and non-edible oils are used in the production of biodiesel. Used cooking oil can be a promising feedstock for low-cost biodiesel production. Moreover, the production of biodiesel from used cooking oil will not only avoid the competition of the same oil resources for food and fuel but will also overcome the waste cooking oil disposal problems. In this study, γ-Al2O3 was modified with 5-20wt% of KOH to form γ-Al2O3-KOH bifunctional

heterogeneous support. The supports were then impregnated with 5wt% Mn and tested for biodiesel production from used palm cooking oil. The catalyst which shows the highest biodiesel yield was then further modified with Mn, Sn and Zn to form bimetallic catalysts and the activity of these catalysts were tested for biodiesel production. Among different catalysts tested, Mo-Mn/γ-Al2O3-20 wt% KOH catalyst shows the highest biodiesel yield of 85.6% in 4

h reaction at 110 oC, methanol to oil molar ratio of 30:1, catalyst loading of 7 wt% and agitation speed of 600 rpm. Moreover, the catalyst shows substantial chemical stability and could be used for at least 6 times without any major loss in its catalytic activity. The physicochemical properties of the synthesized biodiesel were further studied and compared with ASTM and the European biodiesel specifications. The results show that the properties of the biodiesel produced comply with the international standard specifications.

Keywords: γ-Al2O3-KOH, bifunctional catalyst, biodiesel, used palm cooking oil  

References:

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[2] A.P. Vyas, N. Subrahmanyam, P.A. Patel, Production of biodiesel through transesterification of Jatropha oil using KNO3/Al2O3 solid catalyst, Fuel, 88 (2009) 625-628.

[3] M. Ghasemi, A. Molaei Dehkordi, Transesterification of Waste Cooking Oil to Biodiesel Using KOH/γ-Al2O3 Catalyst in a New Two-Impinging-Jets Reactor, Ind. Eng. Chem. Res., 53 (2014) 12238-12248.

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21st International Congress of Chemical and Process Engineering CHISA 2014