Catalytic Acetalization and Hydrogenation of Furfural over the Light‐Tunable Phosphated TiO₂ Catalyst

Abstract

Selective conversion of furfural (FUR) into value-added chemical commodities are of significance for biomass utilization and sustainable economy. The surface solid acid active sites usually play a crucial role in the valorization of the bio-renewable substrates. However, the co-presence of Brønsted and Lewis acid sites on the catalyst would result in the formation of the by-products of acetalization and hydrogenation of FUR. Herein, acetalization of FUR was realized by virtue of the Brønsted acid sites over phosphate modified amorphous TiO 2 (P-TiO 2 ), while the Lewis acid sites take over under the light irradiation, furfuryl alcohols (FFA) received as the product of transfer hydrogenation. Thus, the by-products were avoided by the novel strategy of light-tunable acidity. The feature of reversible, light-tunable acidity provides the possibility to control the reactivity and insights for the blueprint of a one-pot tandem catalytic system.

Understanding the charge transfer dynamics in 3D–1D nanocomposites over solar driven synergistic selective valorization of lignocellulosic biomass: a new sustainable approach

“…CdS for redox active photogenerated excitons and TiO 2 for providing active hydrogenation sites supported by the Lewis acidic surface. 50 The importance of the TiO 2 -CdS heterostructure as a visible light active photocatalyst was further verified by the reaction carried out under controlled conditions i.e. without catalyst (Table 1, entry 7) and in the dark (Table 1, entry 8).…”

“…CdS for redox active photogenerated excitons and TiO 2 for providing active hydrogenation sites supported by Lewis acidic surface. 50 The importance of TiO 2 -CdS heterostructure as visible light active photocatalysts was further verified by the reaction carried out under controlled conditions i.e. without catalyst ( Furthermore, to get insights into the reaction mechanism, the photocatalytic reactions were performed under H 2 atmosphere, without hole scavenger (VanOL) and without HMF.…”

Efficient One‐Pot Synthesis of 2,5‐Furandicarboxylic Acid from Sugars over Polyoxometalate/Metal‐Organic Framework Catalysts

“…Py‐FTIR is difficult to apply the observation of Brønsted acid sites in MOF [20,44] . 2, 6‐dimethylpyridine was chosen as the Brønsted acid sites probe molecules because 2, 6‐dimethylpyridine could only coordinate with Brønsted acid sites (Figure S3b) [45,46] . Further comparing the adsorption behavior of 2, 6‐dimethylpyridine, 2, 6‐dimethyl pyridine adsorbed higher on PW/UiO(Zr, Co) than that of the others, demonstrating that PW/UiO(Zr, Co) catalyst surface had more Brønsted acid sites.…”

Reações Catalíticas De Acetalização Do Furfural: Um Panorama Do Uso De Catálise Homogênea E Heterogênea

“…Fonte: os autores (2023). Liu et al (2021) estudaram a acetalização do furfural sobre TiO2 amorfo modificado por fosfato (P-TiO2) com os álcoois metanol, etanol e etilenoglicol. Nagao et al (2019) relataram a síntese de uma série de nanopartículas de subóxido de titânio (Ti2O3-TH700, Ti2O3-TH550, Ti2O3-com e TiO2-cal550), esses catalisadores obtidos foram usados na acetalização do furfural com 2-propanol.…”