Comparative study of different catalysts for the direct conversion of cellulose to sorbitol

Ribeiro, Lucília S.; Órfão, J.J.M.; Pereira, M.F.R.

doi:10.1515/gps-2014-0091

Cited by 10 publications

(10 citation statements)

References 19 publications

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“…As was demonstrated in a recent review (Makhubela and Darkwa, 2018), among noble metals Ru is the most active and employed in the majority of catalytic systems proposed for hydrolytic hydrogenation of cellulose (Li et al, 2015a; Ribeiro et al, 2015b). In studies of Ru-containing catalysts, the major focus is on various supports and attempts to increase the catalyst efficiency via control of the support structure and properties.…”

Section: Cellulose Hydrolytic Hydrogenationmentioning

confidence: 95%

Cellulose Conversion Into Hexitols and Glycols in Water: Recent Advances in Catalyst Development

et al. 2019

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Conversion of biomass cellulose to value-added chemicals and fuels is one of the most important advances of green chemistry stimulated by needs of industry. Here we discuss modern trends in the development of catalysts for two processes of cellulose conversion: (i) hydrolytic hydrogenation with the formation of hexitols and (ii) hydrogenolysis, leading to glycols. The promising strategies include the use of subcritical water which facilitates hydrolysis, bifunctional catalysts which catalyze not only hydrogenation, but also hydrolysis, retro-aldol condensation, and isomerization, and pretreatment (milling) of cellulose together with catalysts to allow an intimate contact between the reaction components. An important development is the replacement of noble metals in the catalysts with earth-abundant metals, bringing down the catalyst costs, and improving the environmental impact.

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Section: Cellulose Hydrolytic Hydrogenationmentioning

confidence: 95%

Cellulose Conversion Into Hexitols and Glycols in Water: Recent Advances in Catalyst Development

et al. 2019

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“…The temperature programmed reduction (TPR) profiles obtained for samples RuCl 3 -T and RuCl 3 -TSu (Figure 3, dotted line) show two temperature intervals of hydrogen consumption: (i) from 100 to 300 • C, with a maximum located at 220 • C, and (ii) from about 400 • C to 800 • C. The lower-temperature hydrogen consumption is mainly attributed to the reduction of Ru 3+ to Ru 0 [14,27,35] (or some other Ru n+ species with intermediate oxidation states or different degrees of interaction with the carbon surface [27]). The higher-temperature hydrogen consumption is due either to the interaction of hydrogen with the carbon surface upon OFG removal or to a methanation process assisted by hydrogen spillover.…”

Section: Tpr Measurementsmentioning

confidence: 98%

“…Catalyst Ru-TSu leads to a high yield of sugar alcohols (39%) with a 69% cellulose conversion in 3 h, and it is reusable. The comparison with other reported results for similar catalysts [14,15,[20][21][22]35,42] is not straightforward because the reaction conditions are not the same, but catalyst Ru-TSu can be considered among the best-performing ones, considering that the high conversion and yield were obtained in only 3 h, and a relatively high cellulose/Ru weight ratio (80) was used.…”

Section: Hydrolytic Hydrogenation Of Cellulosementioning

confidence: 99%

Carbon-Black-Supported Ru Catalysts for the Valorization of Cellulose through Hydrolytic Hydrogenation

et al. 2018

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The one-pot hydrolytic hydrogenation of cellulose (HHC) with heterogeneous catalysts is an interesting method for the synthesis of fuels and chemicals from a renewable resource like lignocellulosic biomass. Supported metal catalysts are interesting for this application because they can contain the required active sites for the two catalytic steps of the HHC reaction (hydrolysis and hydrogenation). In this work, Ru catalysts have been prepared using a commercial carbon black that has been modified by sulfonation and oxidation treatments with H 2 SO 4 and (NH 4 )S 2 O 8 , respectively, in order to create acidic surface sites. The correlation between the catalysts' properties and catalytic activity has been addressed after detailed catalyst characterization. The prepared catalysts are active for cellulose conversion, being that prepared with the carbon black treated with sulfuric acid the most selective to sorbitol (above 40%). This good behavior can be mainly explained by the suitable porous structure and surface chemistry of the carbon support together with the low content of residual chlorine.

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“…The reaction mechanism consists of the reduction of carbonyl groups of saccharides under hydrogen pressure in the presence of a solid metal catalyst based on Ni, Pd, Pt, or Ru [15,16]. All these catalysts are easily recoverable and display good catalytic activity in terms of sorbitol yield, operating under aqueous-phase solution [6,[17][18][19][20]. In recent years, Raney nickel and ruthenium catalysts made a clean sweep on sorbitol production.…”

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confidence: 99%

Production of Sorbitol via Catalytic Transfer Hydrogenation of Glucose

et al. 2020

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Featured Application: Catalytic transfer hydrogenation from alcohols allow converting under mild reaction conditions glucose into sorbitol.Abstract: Sorbitol production from glucose was studied through catalytic transfer hydrogenation (CTH) over Raney nickel catalysts in alcohol media, used as solvents and hydrogen donors. It was found that alcohol sugars, sorbitol and mannitol, can be derived from two hydrogen transfer pathways, one produced involving the sacrificing alcohol as a hydrogen donor, and a second one involving glucose disproportionation. Comparison between short-chain alcohols evidenced that ethanol was able to reduce glucose in the presence of Raney nickel under neutral conditions. Side reactions include fructose and mannose production via glucose isomerization, which occur even in the absence of the catalyst. Blank reaction tests allowed evaluating the extension of the isomerization pathway. The influence of several operation parameters, like the temperature or the catalyst loading, as well as the use of metal promoters (Mo and Fe-Cr) over Raney nickel, was examined. This strategy opens new possibilities for the sustainable production of sugar alcohols.Sorbitol production was reported to be carried out using cellulose in the presence of noble metals [9] and transition metal-based catalysts [10,11]. However, a most extended alternative is its production starting from glucose. At an industrial scale, sorbitol is produced via glucose hydrogenation [2] as it is the most affordable precursor [12], whose production is liable to be obtained via cellulose hydrolysis [13,14]. The reaction mechanism consists of the reduction of carbonyl groups of saccharides under hydrogen pressure in the presence of a solid metal catalyst based on Ni, Pd, Pt, or Ru [15,16]. All these catalysts are easily recoverable and display good catalytic activity in terms of sorbitol yield, operating under aqueous-phase solution [6,[17][18][19][20]. In recent years, Raney nickel and ruthenium catalysts made a clean sweep on sorbitol production. Ru presents higher activity and selectivity to sorbitol [16,21] than Raney nickel catalysts, but this metal is much more expensive than nickel-based catalysts. In this way, Raney nickel was revealed as the most interesting active phase to be used in the industrial-scale hydrogenation of glucose [21,22], mostly because of its low price [23]. Nevertheless, the lower catalytic activity of nickel as compared to other precious-metal-based conventional hydrogenation catalysts, such as ruthenium, results in the need for high hydrogen pressure and harsh operating conditions. Consequently, a significant energy demand must be satisfied compared to that required when using more active hydrogenation catalysts and, thus, higher environmental impacts are associated with the use of Raney nickel catalysts [24].This work focuses on gaining insights into a developing alternative reaction pathway to the conventional hydrogenation procedure used to transform glucose into sorbitol by exploring the feasibility of car...

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Comparative study of different catalysts for the direct conversion of cellulose to sorbitol

Cited by 10 publications

References 19 publications

Cellulose Conversion Into Hexitols and Glycols in Water: Recent Advances in Catalyst Development

Cellulose Conversion Into Hexitols and Glycols in Water: Recent Advances in Catalyst Development

Carbon-Black-Supported Ru Catalysts for the Valorization of Cellulose through Hydrolytic Hydrogenation

Production of Sorbitol via Catalytic Transfer Hydrogenation of Glucose

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