Browsing by Author "Boscolo, Mauricio"
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Item Conversion of 1-butanol into High Value-Added Chemicals by Mixed Metal Oxides: The Influence of Co2+, Ni2+, and Zn2+ into Condensed Phase Products Distribution(Springer, 2024) Mora Vargas, Jorge Andrés; de Paula Dias, Rafael Mafra; de Lima, Livia Padilha; Orduña Ortega, Julieth; Boscolo, Mauricio; Metzker, GustavoAbstract: The catalytic transformation of 1-butanol into condensed products by mixed metal oxides, based on Mg2+ and Al3+, containing Co2+, Ni2+, and Zn2+, into ethers, aldehydes, alkenes, ketones, alkylbenzenes, and phenolic compounds is described. The reactions were conducted at 550 and 600 °C, with and without methanol co-feeding. The presence of Co2+, Ni2+, and Zn2+ in the catalyst structure, together with the reaction temperature and methanol co-feeding, allowed the modulation of the yield and selectivity of each class of product. Also, to the best of our knowledge, this is the first time that phenolic compounds were produced from 1-butanol, and due to the nature of the condensed products found, the Robinson annulation was proposed as the reaction mechanism. The methodology herein described uses a renewable carbon source, is greener than the current ones for synthesizing the classes of compounds mentioned earlier, and can be an alternative for raw materials currently obtained exclusively from petroleum. Graphical Abstract: (Figure presented).Item Enhancing the production of the fermentable sugars from sugarcane straw: A new approach to applying alkaline and ozonolysis pretreatments(2021) Ortega, Julieth Orduña; Mora Vargas, Jorge Andrés; Metzker, Gustavo; Gomes, Eleni; da Silva, Roberto; Boscolo, MauricioThe present study, sugarcane straw residue (SCS) was submitted to a combination of mild alkaline pretreatment and ozone cycles in a rotary reactor aiming to obtain fermentable sugars. The SCS exposed to short ozone cycles and short reaction times proved to be as efficient as long ozone exposure times usually employed, with no significant variation on the concentration of the fermentable sugars. Also, studies carried out on the ozone concentration, ozone exposure time, reaction time and biomass amount on the ozonolysis process were conducted. The washing processes after alkaline pretreatment and ozonolysis were also studied. During the alkaline pretreatment, approximately 73% of total phenolic compounds (TPC) was generated. After the first wash 79% of the TPC was washed away and 95% was removed after the second wash. The TPC content in wash solution obtained after ozonolysis is about 2.3% of the TPC generated with the alkaline pretreatment. For the enzymatic hydrolysate 0.20 g L−1 of TPC was obtained, a low value compared to similar studies. The inhibitor detected in the highest concentration was acetic acid for all solutions, except for ozonolysis where fumaric acid predominated. Hydroxymethylfurfural (HMF) and furfural were detected in amounts of less than 10 mg L−1.Item Fast and selective synthesis of mono-substituted sucrose methacrylate ester monomer(Elsevier Ltd, 2022) Rojas Sterling, Juan Camilo; Orduña Ortega, Julieth; Metzker, Gustavo; Boscolo, Mauricio; Mora Vargas, Jorge AndresSucrose methacrylate (SM) is a key monomer for synthesizing biocompatible polymers with a carbohydrate core. However, controlled SM synthesis is challenging due to the possible formation of regio-isomers. This study describes SM synthesis that involves ultrasound irradiation of a homogeneous basic medium. The selectivity for mono-substituted SM was 86% within 30 min of reaction. The newly developed methodology is faster and more selective than that of mono-substituted SM synthesis already described in the literature.Item From waste to raw chemicals: Catalytic transformation of fusel oil by mixed metal oxides(Elsevier B.V., 2024) de Lima, Livia Padilha; Mora Vargas, Jorge Andrés; Roveda Jr, Antonio Carlos; Orduna Ortega, Julieth; da Silva, Felipe Garcia; Cassaro, Rafael Francisco; Cardoso, Daniel Rodrigues; Boscolo, Mauricio; Metzker, GustavoIn this study, we detail a catalytic process for the conversion of fusel oil (FO), a by-product of ethanol production considered as waste, into valuable organic compounds, including aldehydes, alkenes, ketones, and alkylbenzenes spanning a carbon chain length from C6 to C12. The reaction was carried out in a fixed bed flow reactor at atmospheric pressure, employing mixed metal oxides (MMO) derived from hydrotalcites (HTC) as catalysts. The HTC were readily synthesized by co-precipitation method involving Mg2+ and Al3+, wherein 20 mol% Mg2+ was substituted by M2+ = Mn, Fe, Co, Ni, Cu, and Zn, and MMO obtained by HTC calcination. These catalysts offer cost-effectiveness compared to noble metal-containing ones while exhibiting remarkable activity in dehydrogenation, hydrogenation, and dehydration reactions pivotal for alcohol reactivity. The proposed methodology holds promise for large-scale industrial use and pioneers a fresh avenue for deriving value-added raw chemicals from a renewable carbon source.