Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4922
Título: Biodiesel production over lithium modified lime catalysts: activity and deactivation
Autor: Puna, Jaime Filipe Borges
Gomes, João Fernando Pereira
Bordado, João Carlos Moura
Correia, Maria Joana Castelo de Assis Teixeira Neiva
Dias, Ana Paula Vieira Soares Pereira
Palavras-chave: Biodiesel
Lime Catalysts
Basicity
Lithium
Methoxide
Diglyceroxide
Ca Leaching
Data: 30-Jan-2014
Editora: Elsevier Science BV
Citação: PUNA, Jaime Filipe Borges; [et al] – Biodiesel production over lithium modified lime catalysts: Activity and deactivation. Applied Catalysis A: Generalrnal of Cleaner Production. ISSN: 0926-860X. Vol. 470 (2014), pp. 451-457
Resumo: Biodiesel production by methanolysis of semi-refined rapeseed oil was studied over lime based catalysts. In order to improve the catalysts basicity a commercial CaO material was impregnated with aqueous solution of lithium nitrate (Li/Ca = 03 atomic ratio). The catalysts were calcined at 575 degrees C and 800 degrees C, for 5 h, to remove nitrate ions before reaction. The XRD patterns of the fresh catalysts, including the bare CaO, showed lines ascribable to CaO and Ca(OH)(2). The absence of XRD lines belonging to Li phases confirms the efficient dispersion of Li over CaO. In the tested condition (W-cat/W-oil = 5%; CH3OH/oil = 12 molar ratio) all the fresh catalysts provided similar biodiesel yields (FAME >93% after 4 h) but the bare CaO catalyst was more stable. The activity decay of the Li modified samples can be related to the enhanced, by the higher basicity, calcium diglyceroxide formation during methanolysis which promotes calcium leaching. The calcination temperature for Li modified catalysts plays an important role since encourages the crystals sinterization which appears to improve the catalyst stability. (C) 2013 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4922
DOI: 10.1016/j.apcata.2013.11.022
ISSN: 0926-860X
1873-3875
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0926860X13007126#
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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