Gabriel José B, Oliveira Victor, Souza Talita Evelyn de, Padula Izabela, Oliveira Luiz C A, Gurgel Leandro V A, Baêta Bruno Eduardo L, Silva Adilson C
Laboratory of Technological and Environmental Chemistry, Department of Chemistry, Institute of Exact and Biological Sciences (ICEB), Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil.
Department of Chemistry, Institute of Exact Sciences (ICEX), Federal University of Minas Gerais (UFMG), Avenida Antônio Carlos, 6627, 31270-901 Belo Horizonte, Minas Gerais, Brazil.
ACS Omega. 2020 Aug 20;5(34):21392-21400. doi: 10.1021/acsomega.0c01547. eCollection 2020 Sep 1.
Furfural chemistry is one of the most promising platforms directly derived from lignocellulose biomass. In this study, a niobium-based catalyst (mNb-bc) was synthesized by a new fast and simple method. This new method uses microemulsion to obtain a catalyst with a high specific surface area (340 m g), defined mesoporosity, and high acidity (65 μmol g). Scanning electron microscopy revealed that mNb-bc has a rough surface. The mNb-bc was used to catalyze the conversion reaction of xylose into 2-furfuraldehyde in a monophasic system using water as a green solvent. This reaction was investigated using a 2 experimental design by varying the temperature, time, and catalyst-to-xylose ratio (CXR). The responses evaluated were xylose conversion ( ), reaction yield (), and selectivity to 2-furfuraldehyde (). The optimized reaction conditions were used to evaluate the reaction kinetics. At milder reaction conditions of 140 °C, 2 h, and a CXR of 10%, mNb-bc led to an value of 41.2%, an value of 77.1%, and a value of 31.8%.
糠醛化学是直接源自木质纤维素生物质的最具前景的平台之一。在本研究中，通过一种新的快速简便方法合成了一种铌基催化剂（mNb-bc）。这种新方法利用微乳液获得了具有高比表面积（340 m²/g）、确定的介孔率和高酸度（65 μmol/g）的催化剂。扫描电子显微镜显示mNb-bc具有粗糙的表面。mNb-bc用于在以水作为绿色溶剂的单相体系中催化木糖转化为2-糠醛的反应。通过改变温度、时间和催化剂与木糖的比例（CXR），使用二因素实验设计对该反应进行了研究。评估的响应指标为木糖转化率（ ）、反应产率（）和对2-糠醛的选择性（）。使用优化的反应条件来评估反应动力学。在140°C、2小时和10%的CXR这种较温和的反应条件下，mNb-bc导致木糖转化率值为41.2%，反应产率值为77.1%，对2-糠醛的选择性值为31.8%。
