Kalsium Oksida Berbasis Limbah sebagai Katalis Heterogen pada Sintesis Biodiesel dari Minyak Goreng Bekas

Haryono

Haryono Departemen Kimia FMIPA Unpad

Abstract

Biodiesel, which is a methyl ester of fatty acids, has been considered as a renewable fuel that is environmentally friendly because it is able to support the sustainability of the carbon dioxide cycle. Biodiesel is conventionally synthesized from oil or fat with a homogeneous base catalyst, such as potassium hydroxide or sodium hydroxide. However, the use of homogeneous catalysts has several drawbacks, such as: it requires a tight free fatty acid content, is prone to oil saponification reactions, is relatively difficult to separate, and cannot be regenerated. Therefore, heterogeneous catalysts in biodiesel synthesis are considered as a substitute for homogeneous catalysts. Calcium oxide is a solid heterogeneous catalyst that has been proven effective in assisting the transesterification reaction of oil into biodiesel. Calcium oxide can be synthesized from calcium carbonate, which is widely found in waste, such as blood clam and egg shells. This study aims to synthesize and characterize calcium oxide from egg and crab shells as a catalyst in the synthesis of biodiesel from used cooking oil. Calcium oxide was obtained by calcination to blood clam and egg shells at 800 ^oC for 8 hours. The calcination results were further characterized by the method of x-ray diffraction and BET (Brunauer-Emmet-Teller) isotherm adsorption-desorption to determine the type of oxide phase formed and the surface characterization. The synthesis of biodiesel was carried out at a reaction time of 2 hours, a temperature of 60 ^oC, a molar ratio of oil to methanol 1:12, and a catalyst content of 10%. The results showed that calcium oxide was successfully synthesized from blood clam and egg shells waste with different characteristics. Calcium oxide from the two wastes is able to catalyze the transesterification reaction of used cooking oil into biodiesel, and biodiesel is produced according to SNI 7182-2015 concerning biodiesel quality standards.

Keyword: biodiesel, calcium oxide, blood clam, egg, transesterificatio

References

[1] Hilmawan E, Fitriana I, Sugiyono A, Adiarso (Editor). Outlook Energi Indonesia 2021: Perspektif Teknologi Energi Indonesia. Badan Pengkajian dan Penerapan Teknologi. 2021; 18-19.
[2] Ramaraju A, Ashok Kumar TV. Biodiesel Development from High Free Fatty Acid Punnakka Oil. ARPN Journal of Engineering and Applied Sciences. 2011; Vol. 6(4): 1-6.
[3] Herizal, Rahman M. Optimasi Transesterifikasi Minyak Kelapa Sawit Menjadi Biodiesel dengan Katalis NaOH. Lembaran Publikasi Lemigas. 2008; Vol. 42(3): 61-66.
[4] Hayyan A, Alam MZ, Mirghani MES., Kabbashi NA, Hakimi NINM, Siran YM, Tahiruddin S. Production of Biodiesel from Sludge Palm Oil by Esterification Process. Energy and Power Engineering. 2010; Vol. 4(1): 11-17.
[5] van Gerpen J, Shanks B, Pruzko R, Clements D, Knothe G. Biodiesel Production Technology. National Renewable Energy Laboratory. 2004; Issue July.
[6] Mat R, Samsudin RA, Mohamed M, Johari A. Solid Catalysts and Their Application in Biodiesel Production. Bulletin of Chemical Reaction Engineering & Catalysis. 2012; Vol. 7 (2): 142-149.
[7] Thanh LT, Okitsu K, Boi LV, Maeda Y. Catalytic Technologies for Biodiesel Fuel Production and Utilization of Glycerol. Catalyst. 2012; Vol. 2: 191-222.
[8] Lani NS, Ngadi N, Yahya NY, Rahman RA. Synthesis, Characterization and Performance of Silica Impregnated Calcium Oxide as Heterogeneous Catalyst in Biodiesel Production. Journal of Cleaner Production. 2017; 146: 116-124.
[9] Correia LM, Saboya RMA, Campelo NS, Cecilia JA, RodrÃguez-CastellÃ³n E, Cavalcante Jr. CL, Vieira RS. Characterization of Calcium Oxide Catalysts from Natural Sources and Their Application in the Transesterification of Sunflower Oil. Bioresource Technology. 2014; 151: 207-213.
[10] Viriya-empikul N, Krasae P, Nualpaeng W, Yoosuk B, Faungnawakij K. Biodiesel Production over Ca-Based Solid Catalysts Derived from Industrial Wastes. Fuel. 2012; Vol. 92: 239-244.
[11] Refaat AA. Biodiesel Production using Solid Metal Oxide Catalyst. Int. J. Environ. Sci. Tech. 2011; Vol. 8(1): 203-221.
[12] Tangoriboon N, Kunanuruksapong R, Sirivat A. Preparation and Properties of Calcium Oxide from Eggshells via Calcination. Materials Science-Poland. 2012; Vol. 30(4): 1-10.
[13] Sanford SD, White JM, Shah PS, Wee C, Valverde MA, Meier GR. Feedstock and Biodiesel Characteristics Report. Iowa Renewable Energy Group Inc., Technical Report. 2009: 1-136.
[14] Lee DW, Park YM, Lee KY. Heterogeneous Base Catalysts for Transesterification in Biodiesel Synthesis, Catal Surv Asia. 2009; Vol. 13: 63-77.
[15] Azam MM, Waris A, Nahar NM. Prospects and Potential of Fatty Acid Methyl Esters of Some Non-traditional Seed Oils for Use as Biodiesel in India. J. Biomass & Bioenergy. 2005; Vol. 29(July): 293-302.
[16] Granados ML, Poves MDZ, Alonso DM, Mariscal R, Galisteo FC, Moreno-Tost R, SantamarÃa J, Fierro JLG. Biodiesel from Sunflower Oil by Using Activated Calcium Oxide. Appl. Catal. B Environ. 2007; Vol. 73: 317-326.
[17] Wu H, Zhang J, Lu Y, Zheng J, Wei Q. Biodiesel Production from Jatropha Oil Using Mesoporous Molecular Sieves Supporting K2SiO3 as Catalysts for Transesterification. Fuel Process