Biopolymers from Plants

Sabater, Marı́a J.; Ródenas, Tania; Heredia, Antonio

doi:10.1002/9783527652457.ch3

Cited by 3 publications

(4 citation statements)

References 195 publications

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“…The catalysts were prepared by dispersing controlled amounts of AG on a carbonaceous support and subsequent introduction of the ruthenium precursor in alcoholic solution. , Typically, for 1 g of catalyst, 200 mg of alginic acid (HAG, Sigma-Aldrich) was dispersed in 20 mL of MiliQ water to obtain the desired alginate loading. Then, the acid was transformed into the more soluble ammonium salt by slow addition of 2 mL of NH 4 OH (Sigma Aldrich, 28%) until slightly basic pH.…”

Section: Experimental Sectionmentioning

confidence: 99%

Active and Regioselective Ru Single-Site Heterogeneous Catalysts for Alpha-Olefin Hydroformylation

et al. 2022

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A heterogeneous ruthenium catalyst consisting of isolated single atoms and disordered clusters stabilized in a N-doped carbon matrix has been synthesized with very good activity and remarkable regioselectivity in the hydroformylation of 1-hexene. The role of the nitrogen heteroatoms has been probed essential to increase the catalyst stability and activity, enabling the stabilization of Ru(II)–N sites according to X-ray photoelectron spectroscopy (XPS) and XANES. Intrinsic size-dependent activity of Ru species of different atomicity has been extracted, correlating the observed reaction rate and the particle size distribution determined by means of aberration-corrected high-angle annular dark-field scanning transmission electron microscopy, permitting the identification of single-atom sites as the most active ones. This catalyst appears as a promising alternative with respect to its heterogeneous counterparts, paving the way for designing improved Ru heterogeneous catalysts.

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Section: Experimental Sectionmentioning

confidence: 99%

Active and Regioselective Ru Single-Site Heterogeneous Catalysts for Alpha-Olefin Hydroformylation

et al. 2022

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“…In nature, cellulose is found in the cell walls of plants, including trees, and it has a vital role in providing mechanical strength and structural support [32]. Plant-based cellulose is accompanied by hemicellulose, lignin, pectin, and other substances [33]. Besides plants, certain bacteria, algae and fungi produce cellulose [34].…”

Section: Cellulose 21 Characteristics Of Cellulosementioning

confidence: 99%

Fabricating Sustainable All-Cellulose Composites

2021

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Climate change, waste disposal challenges, and emissions generated by the manufacture of non-renewable materials are driving forces behind the production of more sustainable composite materials. All-cellulose composites (ACCs) originate from renewable biomass, such as trees and other plants, and are considered fully biodegradable. Dissolving cellulose is a common part of manufacturing ACCs, and currently there is a lot of research focused on effective, but also more environmentally friendly cellulose solvents. There are several beneficial properties of ACC materials that make them competitive: light weight, recyclability, low toxicity, good optical, mechanical, and gas barrier properties, and abundance of renewable plant-based raw material. The most prominent ACC applications are currently found in the food packing, medical, technical and vehicle industries. All-cellulose nanocomposites (ACNCs) expand the current research field and can offer a variety of more specific and functional applications. This review provides an overview of the manufacture of sustainable ACCs from lignocellulose, purified cellulose, and cellulosic textiles. There is an introduction of the cellulose dissolution practices of creating ACCs that are currently researched, the structure of cellulose during complete or partial dissolution is discussed, and a brief overview of factors which influence composite properties is presented.

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“…[46][47][48][49] The physicochemical characteristics and functional properties of chitosan (i. e. polycationic character, biocompatibility, ..) make this polysaccharide of interest in different fields. [46][47][48][49] In this context, a way to increase its surface area and improve the accessibility of functional groups consists of supporting chitosan on a solid with higher surface area (i. e. SiO 2 ) to give a composite with improved textural parameters named Ch@SiO 2 (see characterization data in SI). [49] Thus, in this work we will show that the combination of Ru 3 (CO) 12 and the hybrid Ch@SiO 2 acting as a weak and recoverable ligand, will give rise to a highly active and regioselective catalyst for the hydroformylation of 1-hexene, without the need of using phosphines or similar ligands.…”

Section: Introductionmentioning

confidence: 99%

“…Chitosan is a natural containing biopolymer with low surface area (< 3 m 2 /g) obtained from deacetylation of chitin, whose polymeric chain is composed by β (1-4) D-glucosamine and N-acetyl-D glucosamine units (Figure 1). [46][47][48][49] The physicochemical characteristics and functional properties of chitosan (i. e. polycationic character, biocompatibility, ..) make this polysaccharide of interest in different fields. [46][47][48][49] In this context, a way to increase its surface area and improve the accessibility of functional groups consists of supporting chitosan on a solid with higher surface area (i. e. SiO 2 ) to give a composite with improved textural parameters named Ch@SiO 2 (see characterization data in SI).…”

Section: Introductionmentioning

confidence: 99%

Chitosan‐Silica as a Cheap Carrier and Green Soft Ligand for Improved Ru‐catalyzed Hydroformylation

et al. 2022

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Dodecacarbonyltriruthenium Ru3(CO)12 has been immobilized onto a biopolymer (chitosan) supported on SiO2 (Ch@SiO2) to give Ru−Ch@SiO2. Ch@SiO2 behaves as a soft, recoverable and bulky ligand allowing the stabilization of released Ru active species and preventing its irreversible reduction to Ru0. Under these conditions very high activity (TOF= 1086 h−1; TON=2749) and regioselectivity (n:iso=92 : 8) are obtained, surpassing that of the homogeneous Ru3(CO)12 counterpart. Spectroscopic studies have shown that Ru3(CO)12 transforms into a mononuclear Run+ (n=2,3) di o try carbonyl species by interacting with the amido/amino groups of the biopolymer, being released into the reaction media whilst stabilized by the chitosan functional groups. The herein 0.5 Ru‐Ch@SiO2 catalyst can operate be operated under a semi‐continuous mode for at least 14 h without deactivation, representing providing a starting point in the search for a green catalyst with definitive industrial application in hydroformylations. In particular in the search for a heterogeneous catalyst away from the use of phosphines and their known drawbacks (i. e. tedious synthesis, facile oxidation of phosphor center, ..) as well as expensive Rh as active site.

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Biopolymers from Plants

Cited by 3 publications

References 195 publications

Active and Regioselective Ru Single-Site Heterogeneous Catalysts for Alpha-Olefin Hydroformylation

Active and Regioselective Ru Single-Site Heterogeneous Catalysts for Alpha-Olefin Hydroformylation

Fabricating Sustainable All-Cellulose Composites

Chitosan‐Silica as a Cheap Carrier and Green Soft Ligand for Improved Ru‐catalyzed Hydroformylation

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