Desenvolvimento de catalisador de zeólita beta contendo NB para a transformação da glicose

Abstract

Glucose, an aldose extractable from abundant lignocellulosic biomass, can be transformed into various isomers, such as fructose, through heterogeneous catalysis using Beta zeolites. This ketose, in turn, holds significant industrial value by serving as an intermediate in the synthesis of various intriguing products, like 5-hydroxymethylfurfural, for instance. The aim of this study is to develop catalysts for glucose transformation into other sugars by conducting preparation, characterization, and catalytic evaluation in a batch reactor. To achieve this, zeolites containing 10% by weight of niobium were prepared via impregnation with ammoniacal niobium oxalate. Catalytic assessment revealed that the introduction of the metal into the catalyst could triple the glucose transformation rates, reaching a maximum conversion of 43%. Additionally, under autogenous pressure, the catalyzed reaction using 1.25% (w/w) of zeolite at 140°C yielded fructose with a maximum selectivity of 13%, whereas no fructose was obtained under the condition of 0.25% (w/w) catalyst at 120°C.