Production of renewable aromatics from jatropha oil over multifunctional ZnCo/ZSM-5 catalysts. (December 2021)

• Record Type: Journal Article
• Authors: Singh, Omvir; Agrawal, Ankit; Dhiman, Neha; Vempatapu, Bhanu Prasad; Chiang, Ken; Tripathi, Shailendra; Sarkar, Bipul
• Is Part Of: Renewable energy. Volume 179(2021)
• Page Start: 2124
• Page End: 2135
• Publication Date: 2021-12
• Subjects: Surface acidity -- Supported catalyst -- Aromatisation -- Jatropha oil -- Bio-aromatics; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2021.08.011
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: The transformation of jatropha oil into aromatics using bimetallic ZSM-5 catalyst was investigated in a continuous downflow reactor. The effect of change in surface acidity was observed closely concerning the formation of C6 –C8 aromatics; a balance Lewis and Brønsted acidic sites showed a strong correlation with light aromatics. Ce as a promoter modify the surface acidity, which enhanced the dehydro-deoxygenation reaction and improved the aromatic selectivity. Hence, Ce-promoted ZnCo/Z catalysts showed better performance compared to La-promoted ZnCo/Z. The 10Zn5Co5Ce/Z catalyst showed 87.6% oil conversion, with 81.9% total aromatics. The selectivity toward C6 –C8 aromatics found to be 71.8%, with the presence of 35.3% xylenes and ethylbenzene. The Normalized XANES spectra suggest that the Co resides in the tetrahedrally coordinated environment in the ZnCo2 O4 catalyst and such intensity of the pre-edge feature evidence for incorporating Co into the material framework. The optimised catalyst, i.e., 10Zn5Co5Ce/Z shows negligible coke deposition, and it was calculated to be 1.33 × 10 −3 (gcoke /gcat h); further, the catalyst was regenerated for three consecutive cycles. Graphical abstract: Image 1 Highlight: Rising demand for aromatics requires renewables sources like non-edible plant oils. A selective cracking-dehydrogenation-aromatisation path is adopted for jatropha oil to bioaromatics. Different bimetallic zeolites with different surface acidity were screened. 87.6% conversion with 81.9% total aromatics was noted over ZnCoCe/Z catalyst. Surface area and pore volume were found crucial with acidity for the aromatic selectivity.