Hydrodeoxygenation of phenol over niobia supported Pd catalyst

Barrios, Adriana M.; Teles, Camila A.; Souza, Priscilla M. de; Rabelo‐Neto, Raimundo C.; Jacobs, Gary; Davis, Burtron H.; Borges, Luiz Eduardo Pizarro; Noronha, Fábio B.

doi:10.1016/j.cattod.2017.03.034

Cited by 90 publications

(89 citation statements)

References 39 publications

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“…Various types of catalysts have been investigated for HDO of phenolics . Among those catalysts, transition metal (such as Pd, Pt and Ru) supported on reducible metal oxides (such as TiO 2 , CeO 2 and ZrO 2 ) have been extensively studied,, since they have shown increased selective deoxygenation to aromatics. The possible reason has been ascribed to the oxiphilic site of reducible oxide favors tautomerization of phenol and, therefore, facilitates the formation of aromatics,, or the metal/support interface site favors direct cleavage of C aromatic ‐OH bond toward aromatics ,.…”

Section: Introductionmentioning

confidence: 99%

“…However, we note that different research groups pre‐treated the catalysts and operated the HDO of phenolics under very different conditions (temperature and H 2 pressure) ,, , . It is well known that transition metal supported on reducible metal oxide catalyst, such Pt/TiO 2 , can reduce the support partially and form different degree of strong metal‐support interactions (SMSI), depending on the pretreatment and work conditions ,. The SMSI can be used to tune the property of the metal‐support interface and density of oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Strong Metal‐Support Interaction of Pt/TiO₂ on Hydrodeoxygenation of m‐Cresol

Zhao

Wang

et al. 2018

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Hydrodeoxygenation of m‐cresol was investigated at 350 °C and atmospheric pressure over Pt/TiO2 reduced at different temperatures. Increasing reduction temperature results in an increased degree of strong metal‐support interactions (SMSI). Consequently, both the number of the perimeter sites at the Pt‐TiO2 interface and the oxygen vacancy sites in close proximity to Pt are increased. Increasing reduction temperature from 350 to 550 °C leads to the turnover frequency of toluene formation to increase by more than 3 times. These results indicate that the perimeter sites at the Pt‐TiO2 interface with oxygen vacancy are the more active sites for deoxygenation than the bare Pt sites. The results also suggest that balancing the SMSI effect and the number of exposed Pt sites is essential for an efficient catalyst for deoxygenation of phenolics to aromatics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Strong Metal‐Support Interaction of Pt/TiO₂ on Hydrodeoxygenation of m‐Cresol

Zhao

Wang

et al. 2018

ChemistrySelect

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“…[12] The hydrodeoxygenation (HDO) of phenols can proceed through any of at least three distinct routes; hydrogenation-dehydration (HYD), direct deoxygenation (DDO), and tautomerization (TAU), as presented in Scheme 1. [13][14][15][16][17] Since sulfided catalysts require a continuous source of sulfur to maintain their activity, [9] a sulfiding agent needs to be added to the originally low-sulfur feedstock. [16] Hence, alternatives to sulfided catalysts are desirable.…”

Section: Introductionmentioning

confidence: 99%

Liquid‐phase Hydrodeoxygenation of 4‐Propylphenol to Propylbenzene: Reducible Supports for Pt Catalysts

et al. 2020

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Pyrolysis and liquefaction biocrudes obtained from lignocellulose are rich in phenolic compounds that can be converted to renewable aromatics. In this study, Pt catalysts on reducible metal oxide supports (Nb2O5, TiO2), along with irreducible ZrO2 as a reference, were investigated in the liquid‐phase hydrodeoxygenation (HDO) of 4‐propylphenol (350 °C, 20 bar H2, organic solvent). The most active catalyst was Pt/Nb2O5, which led to the molar propylbenzene selectivity of 77 %, and a yield of 75 % (98 % conversion). Reducible metal oxide supports provided an increased activity and selectivity to the aromatic product compared to ZrO2, and the obtained results are among the best reported in liquid‐phase. The reusability of the spent catalysts was also studied. The spent Pt/Nb2O5 catalyst provided the lowest conversion, while the product distribution of the spent Pt/ZrO2 catalyst changed towards oxygenates. The results highlight the potential of pyrolysis or liquefaction biocrudes as a source of aromatic chemicals.

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“…Due to its phenolic nature and the relatively high homogeneity compared to the parent biomass fast pyrolysis oil, which in addition to phenolic compounds also contains furans, acids, esters, ketones, aldehydes, ethers, alcohols, and sugars due to cellulose/hemicellulose pyrolysis, lignin-derived bio-oil could be utilized in the production of phenol-based resins and polyurethanes, replacing petroleum phenol [48,49]. Furthermore, it can be subjected to hydrodeoxygenation (HDO) for the production of aromatics and cycloalkanes [50][51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Fast Pyrolysis of Lignin Isolated by Hybrid Organosolv—Steam Explosion Pretreatment of Hardwood and Softwood Biomass for the Production of Phenolics and Aromatics

et al. 2019

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Lignin, one of the three main structural biopolymers of lignocellulosic biomass, is the most abundant natural source of aromatics with a great valorization potential towards the production of fuels, chemicals, and polymers. Although kraft lignin and lignosulphonates, as byproducts of the pulp/paper industry, are available in vast amounts, other types of lignins, such as the organosolv or the hydrolysis lignin, are becoming increasingly important, as they are side-streams of new biorefinery processes aiming at the (bio)catalytic valorization of biomass sugars. Within this context, in this work, we studied the thermal (non-catalytic) and catalytic fast pyrolysis of softwood (spruce) and hardwood (birch) lignins, isolated by a hybrid organosolv–steam explosion biomass pretreatment method in order to investigate the effect of lignin origin/composition on product yields and lignin bio-oil composition. The catalysts studied were conventional microporous ZSM-5 (Zeolite Socony Mobil–5) zeolites and hierarchical ZSM-5 zeolites with intracrystal mesopores (i.e., 9 and 45 nm) or nano-sized ZSM-5 with a high external surface. All ZSM-5 zeolites were active in converting the initially produced via thermal pyrolysis alkoxy-phenols (i.e., of guaiacyl and syringyl/guaiacyl type for spruce and birch lignin, respectively) towards BTX (benzene, toluene, xylene) aromatics, alkyl-phenols and polycyclic aromatic hydrocarbons (PAHs, mainly naphthalenes), with the mesoporous ZSM-5 exhibiting higher dealkoxylation reactivity and being significantly more selective towards mono-aromatics compared to the conventional ZSM-5, for both spruce and birch lignin.

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Hydrodeoxygenation of phenol over niobia supported Pd catalyst

Cited by 90 publications

References 39 publications

Effect of Strong Metal‐Support Interaction of Pt/TiO₂ on Hydrodeoxygenation of m‐Cresol

Effect of Strong Metal‐Support Interaction of Pt/TiO₂ on Hydrodeoxygenation of m‐Cresol

Liquid‐phase Hydrodeoxygenation of 4‐Propylphenol to Propylbenzene: Reducible Supports for Pt Catalysts

Catalytic Fast Pyrolysis of Lignin Isolated by Hybrid Organosolv—Steam Explosion Pretreatment of Hardwood and Softwood Biomass for the Production of Phenolics and Aromatics

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Hydrodeoxygenation of phenol over niobia supported Pd catalyst

Cited by 90 publications

References 39 publications

Effect of Strong Metal‐Support Interaction of Pt/TiO2 on Hydrodeoxygenation of m‐Cresol

Effect of Strong Metal‐Support Interaction of Pt/TiO2 on Hydrodeoxygenation of m‐Cresol

Liquid‐phase Hydrodeoxygenation of 4‐Propylphenol to Propylbenzene: Reducible Supports for Pt Catalysts

Catalytic Fast Pyrolysis of Lignin Isolated by Hybrid Organosolv—Steam Explosion Pretreatment of Hardwood and Softwood Biomass for the Production of Phenolics and Aromatics

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Effect of Strong Metal‐Support Interaction of Pt/TiO₂ on Hydrodeoxygenation of m‐Cresol

Effect of Strong Metal‐Support Interaction of Pt/TiO₂ on Hydrodeoxygenation of m‐Cresol