Direct synthesis of Fe-aluminosilicates from red mud for catalytic deoxygenation of waste cooking oil

• Main Authors: Eka Putra Ramdhani, Eka Putra Ramdhani, Eko Santoso, Eko Santoso, Holilah, Holilah, Reva Edra Nugraha, Reva Edra Nugraha, Bahruji, Hasliza, Suprapto, Suprapto, Abdul Jalil, Aishah, Mijan, Nurul Asikin, Syafsir Akhlusa, Syafsir Akhlusa, Didik Prasetyoko, Didik Prasetyoko
• Format: Article
• Language: English
• Published: Royal Society of Chemistry 2023
• Subjects: QD Chemistry; TP Chemical technology
• Online Access: http://eprints.utm.my/106714/1/AishahAbdulJalil2023_DirectSynthesisofFeAluminosilicatesfromRed_compressed.pdf; http://eprints.utm.my/106714/; http://dx.doi.org/10.1039/d3ra05910c
• Institution: Universiti Teknologi Malaysia

Conversion of red mud (RM) that contains a high level of silica, alumina and iron minerals into heterogenous catalysts, offers a route for the utilization of abundant toxic by-products of bauxite refining. In this study, the conversion of red mud into mesoporous Fe-aluminosilicate produced selective catalysts for the deoxygenation of waste cooking oil to green diesel hydrocarbons. Direct conversion of red mud in the presence cetyltrimethylammonium bromide into Fe-aluminosilicate (RM-CTA) produced a highly mesoporous structure with oligomeric Fe2O3 clusters within the pores. When red mud was treated with citric acid (RM-CA-CTA), a wide distribution of Fe2O3 particles was obtained on the aluminosilicate external surface. TEM analysis showed a well-defined hexagonal mesoporosity of Fe-aluminosilicate obtained from untreated red mud, while the treated red mud produced lower regularity mesopores. RM-CTA exhibits 60% WCO conversion and 83.72% selectivity towards liquid products with 80.44% diesel hydrocarbon (C11-C18) yield. The high selectivity was due to the high acidity of Fe-aluminosilicate to dissociate the C-O bond and the regularity of mesostructure for efficient hydrocarbon diffusion, preventing a cracking reaction.