Catalytic hydrogenation of phenol, cresol and guaiacol over physically mixed catalysts of Pd/C and zeolite solid acids

Shafaghat, Hoda; Rezaei, Pouya Sirous; Daud, Wan Mohd Ashri Wan

doi:10.1039/c5ra00367a

Cited by 82 publications

(49 citation statements)

References 29 publications

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“…Therefore, it has been used as a model compound to represent phenolics in bio‐oil and has been studied extensively over various catalytic materials . Among those catalysts, bifunctional zeolite‐supported metal catalysts have attracted significant attention . Most studies on the hydrodeoxygenation (HDO) of guaiacol over metal/zeolite catalysts have been performed in the liquid phase, that is, at a low temperature (<250 °C) and high pressure of H 2 (several MPa) .…”

Section: Introductionmentioning

confidence: 99%

Vapor‐Phase Hydrodeoxygenation of Guaiacol to Aromatics over Pt/HBeta: Identification of the Role of Acid Sites and Metal Sites on the Reaction Pathway

2018

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A comparative study of the hydrodeoxygenation of guaiacol, a phenolic compound derived from the lignin fraction of biomass with both hydroxyl and methoxyl functional groups, was performed on HBeta, Pt/SiO2, and Pt/HBeta at 350 °C and atmospheric pressure. The reaction pathway and the roles of the acid and metal sites were studied. Acid sites catalyze transalkylation and dehydroxylation reactions to produce monohydroxyl phenolics (phenol, cresols, and xylenols) as the major final products. Pt sites catalyze demethylation to result in catechol as the primary product, which can either be deoxygenated to phenol followed by phenol to benzene, or decarbonylated to cyclopentanone and further to butane. The close proximity of Pt and acid sites in bifunctional Pt/HBeta improves transalkylation and deoxygenation (or dehydroxylation) reactions and inhibits demethylation and decarbonylation reactions significantly, which leads to aromatics as the major final products with a total yield >85 %. Both the activity and stability of bifunctional Pt/HBeta during the hydrodeoxygenation of guaiacol are improved compared to those of HBeta and Pt/SiO2. The addition of water to the feed further improves the activity and stability through the hydrolysis of the O−CH3 bond of guaiacol on acid sites and the removal of coke around Pt.

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Section: Introductionmentioning

confidence: 99%

Vapor‐Phase Hydrodeoxygenation of Guaiacol to Aromatics over Pt/HBeta: Identification of the Role of Acid Sites and Metal Sites on the Reaction Pathway

2018

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“…However, lignin-derived phenolic compounds are highly persistent in hydrodeoxygenation reaction. Therefore, transformation of phenolic compounds to high-value and stable components is a research field of great interest, and several researches have been conducted for study of catalytic hydrogenation of phenols [20][21][22][23][24][25][26] . High-pressure hydrogen gas is commonly used for catalytic hydrogenation of bio-oil/bio-oil model compounds.…”

Section: Introductionmentioning

confidence: 99%

Using decalin and tetralin as hydrogen source for transfer hydrogenation of renewable lignin-derived phenolics over activated carbon supported Pd and Pt catalysts

Shafaghat

Rezaei

Daud

2016

Journal of the Taiwan Institute of Chemical Engineers

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“…Three major reaction pathways were observed [269]: direct hydrogenolysis of Ar-OH bond (HDO), the Ar-C bond breaking (DMT) and the hydrogenation of the aromatic ring (HYD) (Figure 16). (110) and Pd(111) surfaces have been examined by McEwen and co-workers [266].…”

Section: Hydrodeoxygenation Of Phenol Derivativesmentioning

confidence: 99%

Upgrading Lignocellulosic Biomasses: Hydrogenolysis of Platform Derived Molecules Promoted by Heterogeneous Pd-Fe Catalysts

et al. 2017

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Abstract:This review provides an overview of heterogeneous bimetallic Pd-Fe catalysts in the C-C and C-O cleavage of platform molecules such as C2-C6 polyols, furfural, phenol derivatives and aromatic ethers that are all easily obtainable from renewable cellulose, hemicellulose and lignin (the major components of lignocellulosic biomasses). The interaction between palladium and iron affords bimetallic Pd-Fe sites (ensemble or alloy) that were found to be very active in several sustainable reactions including hydrogenolysis, catalytic transfer hydrogenolysis (CTH) and aqueous phase reforming (APR) that will be highlighted. This contribution concentrates also on the different synthetic strategies (incipient wetness impregnation, deposition-precipitaion, co-precipitaion) adopted for the preparation of heterogeneous Pd-Fe systems as well as on the main characterization techniques used (XRD, TEM, H 2 -TPR, XPS and EXAFS) in order to elucidate the key factors that influence the unique catalytic performances observed.

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Catalytic hydrogenation of phenol, cresol and guaiacol over physically mixed catalysts of Pd/C and zeolite solid acids

Abstract: Product selectivity of catalytic hydrogenation of phenol, o-cresol, m-cresol and guaiacol over physically mixed catalysts of Pd/C and zeolite solid acids.

Cited by 82 publications

References 29 publications

Vapor‐Phase Hydrodeoxygenation of Guaiacol to Aromatics over Pt/HBeta: Identification of the Role of Acid Sites and Metal Sites on the Reaction Pathway

Vapor‐Phase Hydrodeoxygenation of Guaiacol to Aromatics over Pt/HBeta: Identification of the Role of Acid Sites and Metal Sites on the Reaction Pathway

Using decalin and tetralin as hydrogen source for transfer hydrogenation of renewable lignin-derived phenolics over activated carbon supported Pd and Pt catalysts

Upgrading Lignocellulosic Biomasses: Hydrogenolysis of Platform Derived Molecules Promoted by Heterogeneous Pd-Fe Catalysts

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