Selective conversion of cellulose into bulk chemicals over Brønsted acid-promoted ruthenium catalyst: one-pot vs. sequential process

Wu, Zhijie; Ge, Shenguang; Ren, Chunxiao; Zhang, Minhui; Yip, Alex C.K.; Chen, Xu

doi:10.1039/c2gc36067e

Cited by 56 publications

(33 citation statements)

References 31 publications

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“…[20] Ap ossible explanation could be the reaction pathway.U nder mild reaction conditions, LA hydrogenation proceeds with the formation of 4-hydroxypentanoic acid followed by the intramoleculare sterification to GVL (Pathwaya, Scheme1). [5,9] The presence of acidic groups increases the reaction rate to favor the acid-catalyzed esterification reactiono f the intermediate g-hydroxyvaleric acidt oGVL.…”

Section: Resultsmentioning

confidence: 99%

Acid‐Functionalized Mesoporous Carbon: An Efficient Support for Ruthenium‐Catalyzed γ‐Valerolactone Production

et al. 2015

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The hydrogenation of levulinic acid has been studied using Ru supported on ordered mesoporous carbons (OMCs) prepared by soft-templating. P- and S-containing acid groups were introduced by postsynthetic functionalization before the addition of 1 % Ru by incipient wetness impregnation. These functionalities and the reaction conditions mediate the activity and selectivity of the levulinic acid hydrogenation. The presence of S-containing groups (Ru/OMC-S and Ru/OMC-P/S) deactivates the Ru catalysts strongly, whereas the presence of P-containing groups (Ru/OMC-P) enhances the activity compared to that of pristine Ru/OMC. Under mild conditions (70 °C and 7 bar H2 ) the catalyst shows high selectivity to γ-valerolactone (GVL; >95 %) and high stability on recycling. However, under more severe conditions (200 °C and p H 2=40 bar) Ru/OMC-P is particularly able to promote GVL ring-opening and the consecutive hydrogenation to pentanoic acid.

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Section: Resultsmentioning

confidence: 99%

Acid‐Functionalized Mesoporous Carbon: An Efficient Support for Ruthenium‐Catalyzed γ‐Valerolactone Production

et al. 2015

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“…Cellulose as the main component of plant fiber can be transformed into glucose and then be converted into produce fructose, 5-hydroxymethyl furfural, levulinic acid, as well as sorbitol, mannitol, ethylene glycol, including polyols and other important energy substances and basic platform compounds [1]. The hydrolysis of cellulose into glucose is the necessary reaction process in the process of cellulose conversion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Strong Electronegativity Groups -Cl as the Adsorption Center of PTA@MIL-101-NH²-Cl for the Selective Hydrolysis of Cellulose into Glucose

Han¹,

Wang²,

Wan³

et al. 2017

Proceedings of the 3rd 2017 International Conference on Sustainable Development (ICSD 2017)

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Abstract. In this paper, the catalyst PTA@MIL-101-NH 2 -Cl with various 2, 5-dichloroterephthalic acid was synthesized. Based on this, the effect of the strong negative groups -Cl on the crystal structure, molecular structure and thermal stability of the catalyst was studied. It was found that the immobilization of -Cl did not affect the structure of the catalyst, and it can improve the thermal stability of the catalyst to a certain extent. The mechanism of -Cl as the cellulose adsorption center in the directional hydrolysis of cellulose were analyzed. The strong negative groups -Cl form hydrogen bonds with the hydroxyl of cellulose to selectively adsorb cellulose, weaken the molecular hydrogen bonds of cellulose molecules to reduce the difficulty of cellulose hydrolysis and improve its hydrolysis efficiency. The yield of glucose obtained by the hydrolysis of cellulose after grafting-Cl catalyst was 81% higher than that without -Cl.

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“…Concerns about the depletion of fossil fuel reserves, global climate change and increasing energy demands have encouraged the exploration of new renewable alternatives to fossil raw materials for production of energy, fuels and chemicals [1][2][3]. Cellulose, the most abundant source of biomass on Earth, is currently regarded as a promising alternative for the sustainable supply of fine chemicals and fuel, as it cannot be digested by humans and thus its use, unlike corn or starch, will not impose a negative impact on food supplies [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…For the hydrolysis of cellulose strong mineral acids, such as hydrochloric acid or sulfuric acid, are traditionally used, but they are corrosive and have to be separated from the reaction mixture [1,5]. An ideal alternative is to use a heterogeneous catalyst, which is easily separable from the reaction mixture [2,10]. So, the suitable catalyst should provide acid sites for the hydrolysis and metallic sites for the hydrogenation.…”

Section: Introductionmentioning

confidence: 99%

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

Ribeiro¹,

Órfão²,

Pereira³

2015

Green Processing and Synthesis

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Abstract:The catalytic conversion of lignocellulosic biomass to obtain high added value compounds and fuels is a rapidly developing field. Given the abundance of this renewable raw material and its reduced impact on the food chain, it is an attractive source for obtaining chemicals or fuels in the context of a sustainable economy. In this work, bi-functional catalysts were developed that were capable of performing in a single step the hydrolysis and hydrogenation of cellulose to produce compounds that may be used in the production of fine chemicals or easily converted into fuels (e.g., sorbitol). Different activated carbon (AC) supported metal catalysts were examined for the one-pot hydrolytic hydrogenation of cellulose. Among the prepared catalysts, 0.4% Ru/AC was shown to be the most active and selective for the conversion of cellulose into sorbitol. When microcrystalline cellulose was used, a conversion of 32% was reached after 5 h of reaction, with a selectivity to sorbitol of 30%. More over, ball-milled cellulose allowed attaining conversions over 50%, with selectivities to sorbitol of 45%. The results obtained showed that Ru/AC is effective for the hydrolytic hydrogenation of cellulose to sugar alcohols and that the conversion can be greatly improved by using the substrate after pre-treatment by ball-milling.

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Selective conversion of cellulose into bulk chemicals over Brønsted acid-promoted ruthenium catalyst: one-pot vs. sequential process

Cited by 56 publications

References 31 publications

Acid‐Functionalized Mesoporous Carbon: An Efficient Support for Ruthenium‐Catalyzed γ‐Valerolactone Production

Acid‐Functionalized Mesoporous Carbon: An Efficient Support for Ruthenium‐Catalyzed γ‐Valerolactone Production

Influence of Strong Electronegativity Groups -Cl as the Adsorption Center of PTA@MIL-101-NH²-Cl for the Selective Hydrolysis of Cellulose into Glucose

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

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