Exploring the Potential of H-Zeolites as Heterogeneous Catalysts for the Chemical Recycling of Polysaccharides and Their Flexible Films

Autor(es)

Fernandes, Rafaella F. ; Kalita, Naba K. ; Liguori, Anna ; Gonzalez, Ernesto A. Urquieta ; Hakkarainen, Minna ; Sobral, Paulo Jose A. ; Otoni, Caio G.

• Tipo de documento: Artigo Científico
• Fonte: CHEMSUSCHEM; v. N/A, p. 9-pg., 2025-02-26.

Resumo

Zeolites are a group of crystalline aluminosilicates with exchangeable cations and molecular-dimensioned micropores, which have successfully been applied to transform biomass and waste into biofuels. Herein, the effectiveness of acidic H-zeolites in biomass transformation and chemical valorization is demonstrated. In this process, the Br & oslash;nsted/Lewis acid sites in zeolites catalyze the transition of carbohydrates into valuable chemicals. beta-glucan polymer extracted from the lichen Usnea was catalytically converted into value-added molecules, such as glucose monomers. Particular challenges to elucidate the zeolite-catalyzed beta-glucan conversion to glucose were addressed, namely: (i) water as the solvent, ii) hydrolysis of the biopolymer in an ionic liquid of 1-Butyl-3-vinylimidazolium bromide ([BVinIm]Br), and iii) reaction time of 30, 60, 120, and 240 min. Effective hydrolysis of beta-glucan was achieved by H-zeolites (H-Beta, H-Mordenite, and H-ZSM-5), and the formed glucose was quantified through the dinitrosalicylic acid (DNS) method. Finally, applying H-zeolites as heterogeneous catalysts to prove the chemical recyclability of flexible films based on beta-glucan was demonstrated as a step forward in integrating biopolymer-based materials into the circular economy. (AU)

• Processo FAPESP: 23/01339-3 - Beta-Glucana liquênica, biopolímero versátil e promissor para desenvolvimento de filmes biodegradáveis
• Beneficiário: Paulo José do Amaral Sobral
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 21/12394-0 - Métodos sintéticos sustentáveis empregando catálise, solventes verdes, reagentes seguros e materiais de partida renováveis
• Beneficiário: Arlene Gonçalves Corrêa
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 23/09513-2 - b-Glucana liquênica, polissacarídeo versátil e promissor para desenvolvimento de filmes biodegradáveis
• Beneficiário: Rafaella Ferreira Fernandes
• Modalidade de apoio: Bolsas no Brasil - Programa Fixação de Jovens Doutores
• Processo FAPESP: 21/12071-6 - Arquitetando coloides via interações supramoleculares: de fundamentos a aplicações
• Beneficiário: Watson Loh
• Modalidade de apoio: Auxílio à Pesquisa - Temático