Effect of Sr concentration in SrK/CaO oyster shell derived catalysts for biodiesel production-Reference-Cited by-同舟云学术

Effect of Sr concentration in SrK/CaO oyster shell derived catalysts for biodiesel production

Published:2024-06-01 Issue:6 Volume:22 Page:689-700
ISSN:1542-6580
Container-title:International Journal of Chemical Reactor Engineering
language:en
Short-container-title:

Author:

Ramírez-Paredes Emanuel A.¹,Rodriguez Jose A.¹^ORCID,Chavez-Esquivel Gerardo²^ORCID,Tavizón-Pozos Jesús Andrés³^ORCID

Affiliation:

1. 27781 Área Académica de Química, Universidad Autónoma del Estado de Hidalgo , Carr Pachuca-Tulancingo km. 4.5, Colonia Carboneras , Mineral de la Reforma , Hidalgo , 42184 , México

2. Departamento de Ciencias Básicas , 27787 Universidad Autónoma Metropolitana Azcapotzalco , Av. San Pablo 420, Col. Nueva Rosario, Azcapotzalco , Ciudad de México , 02128 , México

3. Investigadoras e Investigadores por México del CONAHCYT, Área Académica de Química, Universidad Autónoma del Estado de Hidalgo , Carr Pachuca-Tulancingo km. 4.5, Colonia Carboneras , Mineral de la Reforma , Hidalgo , 42184 , México

Abstract

Abstract This study examined the effect of the Sr concentration in SrK/CaO catalysts based on oyster shells for the transesterification of canola oil. The CaO support was obtained by mixing 800 °C calcined oyster shell and limestone. Then, K and Sr were impregnated simultaneously at three different Sr/(Sr + K) molar ratios, 0.2, 0.3, and 0.4, and calcined at 800 °C. XRD, SEM, and Hammett indicators were used to characterize the catalysts. The reaction conditions were 60 °C, 1 h, met/oil = 12.5, and a catalyst loading of 7 wt%. The results showed that a Sr/(Sr + K) = 0.3 produces larger K2Sr(CO3)2 crystals that contribute synergistically to the catalytic activity. At Sr/(Sr + K) > 0.3, the K and Sr are segregated, decreasing the alkaline character and activity. Also, the optimization of WCO transesterification conditions was carried out by Box–Behnken response surface design with SrK/CaO-0.3 catalyst. The theoretical optimal conditions were 70 °C, 1.5 h, and a met/oil = 10, which achieved 79 % of biodiesel yield. Nonetheless, the produced WCO biodiesel did not present acceptable quality, and this reactive system increased the lixiviation of the active phases.

Publisher

Walter de Gruyter GmbH

Link

https://www.degruyter.com/document/doi/10.1515/ijcre-2024-0021/pdf

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