Conversion of Cellulose into Sorbitol over Carbon Nanotube-Supported Ruthenium Catalyst

Deng, Weiping; Tan, Xuesong; Fang, Wenhao; Zhang, Qinghong; Wang, Ye

doi:10.1007/s10562-009-0136-3

Cited by 291 publications

(158 citation statements)

References 38 publications

(48 reference statements)

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“…For example, Pt/g-Al 2 O 3 catalyzed the conversion of cellulose to yield 25 % and 6 % of sorbitol and mannitol, respectively. Alternatively, on a Ru/C catalyst Luo et al reported yields of 30 % and 10 % of sorbitol and mannitol, respectively.[3] Most notably, in such studies less-expensive Ni catalysts consistently exhibit inferior performances towards sugar alcohol production (Supporting Information, Table S1), [2,[4][5] in agreement with their known unselective hydrogenolysis behavior. [8] The main difficulty in using conventional heterogeneous catalysts for bulky cellulose substrates is the limited accessibility of the active catalytic sites.…”

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confidence: 87%

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Selective Bifunctional Catalytic Conversion of Cellulose over Reshaped Ni Particles at the Tip of Carbon Nanofibers

et al. 2010

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Although cellulose, as an abundant and renewable resource, offers a promising alternative for the production of biofuels and platform chemicals, [1] there have thus far only been a few studies that have reported its aqueous-phase conversion into polyols by solid chemocatalysts. [2][3][4][5] The principal reason is that these polymeric biomolecules with a semicrystalline structure cannot penetrate the pores of conventional heterogeneous catalysts. Advances in the conversion of cellulose therefore require the design of efficient multifunctional catalysts with sterically accessible sites.[6] Herein, we demonstrate that sugar alcohols can be selectively produced from cellulose in a one-pot catalytic process over reshaped Ni particles at the tip of carbon nanofibers.One elegant strategy to valorize cellulose into polyols is inspired by a previous report on starch conversion. [7] One-pot catalytic approaches of this kind rely on proton-catalyzed hydrolysis of the glycoside bonds, followed by fast metal-catalyzed hydrogenation of the released glucose units into sorbitol. A high sorbitol yield is only guaranteed if hydrolysis is the rate-limiting step (preventing undesirable glucose degradation). The first reports on the application of such bifunctional catalysis to cellulose fractions appeared in the pioneering work of Fukuoka and Dhepe.[2] They demonstrated the selective conversion of cellulose into sugar alcohols by using supported precious-metal catalysts at elevated temperatures. Pt and Ru gave the highest hexitol yields. For example, Pt/g-Al 2 O 3 catalyzed the conversion of cellulose to yield 25 % and 6 % of sorbitol and mannitol, respectively. Alternatively, on a Ru/C catalyst Luo et al. reported yields of 30 % and 10 % of sorbitol and mannitol, respectively.[3] Most notably, in such studies less-expensive Ni catalysts consistently exhibit inferior performances towards sugar alcohol production (Supporting Information, Table S1), [2,[4][5] in agreement with their known unselective hydrogenolysis behavior. [8] The main difficulty in using conventional heterogeneous catalysts for bulky cellulose substrates is the limited accessibility of the active catalytic sites. Their performance seems to be governed by the restricted space inside the pore systems, preventing polymeric biomolecules from penetrating to the metal sites.[6] To overcome this incompatibility between substrate and catalyst, the present study uses carbon nanofibers instead of porous solids to support Ni at the tip of the carbon filaments. In a typical synthesis, the Ni-containing carbon nanofibers (Ni/CNF) were formed by catalytic vapor deposition (CVD) of methane over a catalyst consisting of Ni nanoclusters supported on g-alumina (Puralox, 155 m 2 g À1).[9] The textural properties of the catalysts were investigated by scanning electron microscopy (SEM) and N 2 physisorption.As can be seen in Figure 1 a, the obtained sample of carbon nanofibers grown over supported nickel (Ni/CNF) showed an entangled "spaghetti-like" morphology with a fiber diameter ...

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confidence: 87%

“…[2][3][4][5] The principal reason is that these polymeric biomolecules with a semicrystalline structure cannot penetrate the pores of conventional heterogeneous catalysts. Advances in the conversion of cellulose therefore require the design of efficient multifunctional catalysts with sterically accessible sites.…”

mentioning

confidence: 99%

Selective Bifunctional Catalytic Conversion of Cellulose over Reshaped Ni Particles at the Tip of Carbon Nanofibers

et al. 2010

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“…So, the suitable catalyst should provide acid sites for the hydrolysis and metallic sites for the hydrogenation. Ruthenium (Ru) catalysts have shown to be the most effective in the direct conversion of cellulose into polyols [2,11,12]. However, the problem about the optimization of the support remains.…”

Section: Introductionmentioning

confidence: 99%

“…However, the problem about the optimization of the support remains. Activated carbon (AC) is most often used to stabilize Ru particles and is cheap [13], whereas carbon nanotubes [11,14] and nanofibers [15] are promising supports, but are more expensive.…”

Section: Introductionmentioning

confidence: 99%

“…Although exciting progress has been made by several groups [7,11,[16][17][18], intensive studies are still required for exploring high-performance catalysts. The aim of this work is to develop an efficient process for the one-pot catalytic conversion of cellulose to sorbitol, using different carbon supported metal catalysts under H 2 pressure.…”

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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Heterogeneous Catalysts for Biomass Conversion

Wang¹,

Li²,

Zhang³

2012

The Role of Green Chemistry in Biomass Processing and Conversion

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Conversion of Cellulose into Sorbitol over Carbon Nanotube-Supported Ruthenium Catalyst

Cited by 291 publications

References 38 publications

Selective Bifunctional Catalytic Conversion of Cellulose over Reshaped Ni Particles at the Tip of Carbon Nanofibers

Selective Bifunctional Catalytic Conversion of Cellulose over Reshaped Ni Particles at the Tip of Carbon Nanofibers

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

Heterogeneous Catalysts for Biomass Conversion

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