Heteropolyacids and sulfonic acid-bifunctionalized organosilica spheres for efficient manufacture of cellulose acetate propionate with high viscosity

Abstract

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Solidified and Immobilized Heteropolyacids for the Valorization of Lignocellulose

“…Recently, Song et al. reported the functionalization of organosilica nanospheres with Brønsted acidic ILs and their subsequent impregnation with HPAs [24] . In these types of catalysts the HPA is strongly bound by ionic interaction with the imidazolium cation of the IL on the surface (Figure 11).…”

“…Recently, Song et al reported the functionalization of organosilica nanospheres with Brønsted acidic ILs and their subsequent impregnation with HPAs. [24] In these types of catalysts the HPA is strongly bound by ionic interaction with the imidazolium cation of the IL on the surface (Figure 11). The solid acid catalyst H 3 PW/Si(Et)Si-DimÀ SO 3 H (Dim = dihydroimidazole, 7.5 wt% H 3 PW loading) was successfully applied in the esterification of cellulose-to-cellulose acetate propionate.…”

“…These selected examples are intended to provide insight into the catalytic potential of homogeneous HPAs in the valorization of lignocellulose. The interested reader is referred to the following review articles that deal with the topic in more detail [23–29] …”

“…The interested reader is referred to the following review articles that deal with the topic in more detail. [23][24][25][26][27][28][29] Regarding the sustainable valorization of biomass and the establishment of industrial-scale processes, it is necessary to be able to recycle the HPA-catalysts sufficiently. Different strategies for HPA recycling in biomass applications such as the use of assemblies, thermo-responsive systems, and solidification as salts or immobilization on heterogeneous supports have been investigated in recent years.…”

Reaction-Controlled Phase-Transfer Process of Polyoxometalate-Based Catalyst for Cellulose Esterification: A Molecular Dynamics Study

“…Therefore, POMs can exhibit good response effects in the catalysis process of reaction-controlled phase transfer. At the same time, POMs have also been confirmed as active sites for catalyzing cellulose esterifications. − …”