Strontium zirconate heterogeneous catalyst for biodiesel production: Synthesis, characterization and catalytic activity evaluation

Autor: Laudemir Carlos Varanda, Francisco Marcos C. Batista, Rondenelly Brandão da Silva, Yussra A. Ghani, José Eduardo Dutra de Oliveira, José Renato de Oliveira Lima, Rafael A. Bini
Rok vydání: 2012
Předmět:
Zdroj: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
ISSN: 0926-860X
Popis: Strontium zirconate oxide was synthesized by co-precipitation and the citrate route and was evaluated as a heterogeneous catalyst for biodiesel production. The catalyst samples were characterized by XRD, FTIR, and TG, and catalytic activity was measured based on the ester content of the biodiesel produced that was quantified by GC. The co-precipitate samples were obtained in alkaline pH and had a mixture of the perovskite and pure strontium and zirconium oxide phases. Ester conversion using these samples was approximately 1.6%, indicating no catalytic activity. The citrate route was more efficient in producing perovskite when carried out at pH 7–8; excess SrCO 3 was found on the catalyst surface due to CO 2 adsorption, thus demonstrating no catalytic activity. The same synthesis carried out at pH 2 resulted in free OH − groups, with a small amount of the carbonate species that produced ester yield values of 98%. Therefore, matrices based on strontium zirconate produced via the citrate route in acidic media are potential heterogeneous catalysts for transesterification.
Databáze: OpenAIRE
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