Metallo-stannosilicate heterogeneous catalyst for biodiesel production using edible, non-edible and waste oils as feedstock

Abstract

Edible and non-edible lipid feedstocks A B S T R A C TThis study reports the synthesis, physicochemical characterization by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and solid-state MAS NMR ( 1 H, 23 Na, 29 Si and 119 Sn MAS NMR) of a metallo-stannosilicate and its application as a heterogeneous catalyst for biodiesel production via ethanolysis and methanolysis routes using edible, non-edible an waste oils as feedstocks. XRD characterization of the metallo-stannosilicate has revealed a typical structure of mixed octahedral-pentahedral-tetrahedral material with an orthorhombic unit cell (a = 14.522 Ǻ, b = 12.469 Ǻ, and c = 10.654 Ǻ). 119 Sn single-pulse MAS NMR results presented two resonance lines, at δ 1 = -683.8 ppm and δ 2 = -690.9 ppm, which were assigned to the tin octahedrally coordinated in the metallo-stannosilicate structure. Heterogenous catalytic studies in the transesterification of refined edible, non-edible, and waste oils have resulted in high yields of FAMEs and FAEEs (fatty acid methyl and ethyl esters), nevertheless the highest FAMES (98.2%) and FAEEs (96.6%) yields were obtained for non-edible microalgae oil extracted from the genetically modified heterotrophic algal strain Prototheca moriformis. Catalytic studies also using non-edible macaw palm oil (Acrocomia aculeata) with a high content of free fatty acids (FFAs) demonstrated that the catalyst could simultaneously perform esterification and transesterification reactions. These findings indicate the potential application of this novel metallo-stannosilicate in the production of renewable and environmentally clean biofuels, like biodiesel, using different sources of lipids feedstocks, notably those that do not compete with food production.⁎ Corresponding author at: Rua Cristóvão Colombo 2265, São José do Rio Preto, SP,

Metallo-stannosilicates as inorganic supports to immobilization of lipase from Thermomyces lanuginosus for biodiesel production

“…This study is a sequence of previous work reported by the authors research group 16 concerning the application of a metallo-stannosilicate for biodiesel production using edible, nonedible and waste oils as feedstocks. In this paper, several stannosilicates were synthesized using different sol-gel chemical compositions.…”

“…Mixed framework OPT materials containing coordinated tetrahedra or octahedra, namely stannosilicates, is one of these materials subject of research. Stannosilicates and tin-zeotypes materials have been reported as ion exchangers, sorbents and catalysts for several types of reaction, as purification of natural gas with sulfur compounds, like hydrogen sulfides or oxysulfides 11 , and catalytic reactions for decomposition of propan-2ol and oxidation of cyclohexene 12 , Baeyer-Villiger oxidation reactions 13 , monosaccharide isomerization reactions 14,15 and application as heterogeneous catalysts for biofuels production 16 . Tin-based homogeneous and heterogeneous catalysts have been used in transesterification reactions, mainly using refined edible oils as feedstocks and methanol, typically providing high yields of fatty acid methyl esters (FAMEs) [17][18][19][20][21][22][23][24] .…”