Promoting effect of SnOxon selective conversion of cellulose to polyols over bimetallic Pt–SnOx/Al2O3catalysts

Deng, Tong; Liu, Haichao

doi:10.1039/c2gc36088h

Cited by 97 publications

(60 citation statements)

References 46 publications

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“…It is well known that fructose is converted to DHA and GAL by the retro-aldol reaction, and that PAL is derived by the dehydration of GAL [34,35]. A similar route was proposed by Liang et al, who used a Cu-Cr catalyst with a basic catalyst [30], Chambon et al who used Pt/AlW [34], and Deng et al who used Ni SnO x /Al 2 O 3 [35] and Pt SnO x /Al 2 O 3 [20]. Thus, the reaction pathway using the ZnO + Ru/C system was scrutinized.…”

Section: Reaction Mechanismmentioning

confidence: 97%

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Selective transformation of glucose into propylene glycol on Ru/C catalysts combined with ZnO under low hydrogen pressures

Hirano

Sagata

Kita

2015

Applied Catalysis A: General

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a b s t r a c tRecently, biomass resources have garnered significant attention as sustainable and renewable raw materials for the production of chemicals. Propylene glycol (PG) is a valuable chemical product that can be synthesized from biomass. Herein, the selective transformation of glucose into PG was investigated on a carbon-supported 5 wt% Ru catalyst (5%-Ru/C) combined with solid acid-base catalysts under low hydrogen pressures. The reaction conditions, namely the amount of ZnO, temperature, and hydrogen pressure, were also evaluated. At a hydrogen pressure of 0.4 MPa, a full conversion of glucose and 38% yield of PG were obtained using the ZnO + Ru/C system at 453 K for 20 h, while the yield of PG on Ru/C alone was only 9.3% under the same conditions. Studies on the reaction mechanism indicated that the transformation of glucose into PG consisted of the isomerization of glucose to fructose, retro-aldol reaction of fructose to triose (dihydroxyacetone and glyceraldehyde), dehydration of glyceraldehyde to pyruvaldehyde, and successive hydrogenation of pyruvaldehyde to PG via hydroxyacetone. The ZnO catalyst promoted both the isomerization and retro-aldol reaction steps, and the Ru catalyst promoted the hydrogenation steps. The retro-aldol reaction, which included the cleavage of C3 C4 bond in glucose, enabled the selective transformation of glucose into PG under low hydrogen pressures. These findings provide novel insights into the efficient synthesis of PG from glucose, which could be achieved by combining and optimizing the retro-aldol and hydrogenation steps.

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Section: Reaction Mechanismmentioning

confidence: 97%

“…Sn/Pt ratios over 1.5 led to the preferential conversion to C 2 and especially C 3 products (e.g., hydroxyacetone) over hexitols. When the Sn/Pt ratio was 3.8, 25.2% yield of hydroxyacetone was obtained at 473 K, 6 MPa H 2 , and 30 min [20].…”

Section: Introductionmentioning

confidence: 99%

Selective transformation of glucose into propylene glycol on Ru/C catalysts combined with ZnO under low hydrogen pressures

Hirano

Sagata

Kita

2015

Applied Catalysis A: General

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“…In comparison with other basic sites of CeO x , ZnO x, and AlO x supported on Al 2 O 3 , the SnO x presented a larger concentration of stronger basic sites which facilitated the isomerization of glucose to fructose and its subsequent C-C bond cleavage. In a later study, the authors obtained hexitols and 1,2-PG from cellulose conversion by using a bimetallic catalyst of Pt-SnO x /Al 2 O 3 which had enhanced hydrogenation activity as compared to the previously employed Ni-Sn/Al 2 O 3 [136].…”

Section: Catalysts and Reaction Mechanismmentioning

confidence: 99%

“…These catalysts include Ni/ZnO [134], Cu/CrO x -Ca(OH) 2 [135], Pt-Sn/Al 2 O 3 [136], Ni-La 2 O 3 [32], Ru/C--NaOH [137], CuO/ZnO/Al 2 O 3 [138], and Ru/NbOPO 4 [139]. With respect to the catalytic performance, they are generally less selective to the EG formation but give remarkably higher yields of 1,2-PG in contrast to the tungstenic catalysts.…”

Section: Catalysts and Reaction Mechanismmentioning

confidence: 99%

Mechanism and Kinetic Analysis of the Hydrogenolysis of Cellulose to Polyols

Wang

Pang

et al. 2016

Green Chemistry and Sustainable Technology

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The catalytic hydrogenolysis of cellulose to polyols represents an attractive process for biomass conversion to value-added products with a high atom economy. In the past decade, extensive studies have been conducted and promptly accumulated a rich knowledge in this field. In this chapter, we focus on the review of reaction mechanisms and kinetics after a brief description of the catalyst development for this process. In view of the different polyol products, the present review is mainly composed of two parts: cellulose conversion to sugar alcohols and cellulose hydrogenolysis to ethylene glycol and 1,2-propylene glycol. The reaction mechanisms are discussed and summarized to obtain general rules in terms of the specific performance of various catalysts. The reaction kinetics of cellulose hydrogenolysis are analyzed on the basis of the kinetics of the individual reaction steps and their correlations in the whole route covering in detail the reactions of cellulose hydrolysis, sugar hydrogenation, retro-aldol condensation, and sugar condensations. Finally, the prospective for the reaction mechanism and kinetics study of cellulose hydrogenolysis is presented.

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“…As so, the selection of support is also important beyond the active metal selection and parametric optimization for selective production of sorbitol directly from cellulose. It has been observed that Ru loaded on different supports such as activated carbon [21,22], Al 2 O 3 [21][22][23], TiO 2 [22,24], carbon nanotubes [10] and carbon nanofibers [21] have different catalytic performances [9] and their activity/selectivity depends on the support material. Since this question about optimal support remains, the aim of this work is to develop an efficient catalyst for the one-pot catalytic conversion of cellulose to sorbitol under hydrogen by testing various supported ruthenium catalysts.…”

Section: Introductionmentioning

confidence: 99%

Direct conversion of cellulose to sorbitol over ruthenium catalysts: Influence of the support

et al. 2017

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Promoting effect of SnO_xon selective conversion of cellulose to polyols over bimetallic Pt–SnO_x/Al₂O₃catalysts

Cited by 97 publications

References 46 publications

Selective transformation of glucose into propylene glycol on Ru/C catalysts combined with ZnO under low hydrogen pressures

Selective transformation of glucose into propylene glycol on Ru/C catalysts combined with ZnO under low hydrogen pressures

Mechanism and Kinetic Analysis of the Hydrogenolysis of Cellulose to Polyols

Direct conversion of cellulose to sorbitol over ruthenium catalysts: Influence of the support

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