Hydrodeoxygenation of guaiacol over Ni@Pd and Ni@Pt bimetallic overlayer catalysts

Lai, Qinghua; Zhang, Chen; Holles, Joseph H.

doi:10.1016/j.apcata.2016.09.009

Cited by 74 publications

(28 citation statements)

References 74 publications

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“…Previous DFT studies investigated properties of Pd overlayer on Cu and Co substrate, and suggested a reduced d‐band center energy as well as reduced adsorption strength . Furthermore, prior studies confirmed overlayer catalysts synthesized by the directed deposition technique possessed reduced adsorption hydrogen strength as anticipated . Therefore, through the formation of overlayer structure, the furfural conversion reactivity of palladium sites is expected to benefit from this reduced adsorption strength.…”

Section: Resultsmentioning

confidence: 84%

“…[15,57] Furthermore, prior studies confirmed overlayer catalysts synthesized by the directed deposition technique possessed reduced adsorption hydrogen strength as anticipated. [29,[58][59] Therefore, through the formation of overlayer structure, the furfural conversion reactivity of palladium sites is expected to benefit from this reduced adsorption strength. In order to demonstrate this proposal, reaction kinetics of overlayer catalyst Cu@Pd and pure Cu were also studied.…”

Section: Furfural Hydrogenation Reactivitymentioning

confidence: 99%

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Kinetics of Furfural Hydrogenation over Bimetallic Overlayer Catalysts and the Effect of Oxygen Vacancy Concentration on Product Selectivity

et al. 2019

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Furfural hydrogenation over silica‐supported Co@Pd and Cu@Pd bimetallic overlayer catalysts was studied in this work. Both overlayer catalysts showed enhanced reactivity compared to pure Pd in furfural hydrogenation. Langmuir‐Hinshelwood kinetic study revealed that this enhanced reactivity could be attributed to the decreased hydrogen surface coverage on catalyst surface of overlayer catalysts compared to pure Pd during reaction, releasing more available active sites for surface reaction or furfural adsorption to take place. The effect of oxygen vacancy concentration on furfural hydrogenation product selectivity was also studied. It is proposed that oxygen vacancies were crucial for both furfural hydrodeoxygenation and aromatic ring hydrogenation, depending on the concentration of oxygen vacancies. This work provides new perspective for tuning the furfural hydrogenation product selectivity by altering the oxygen vacancy concentration.

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Section: Resultsmentioning

confidence: 84%

Section: Furfural Hydrogenation Reactivitymentioning

confidence: 99%

Kinetics of Furfural Hydrogenation over Bimetallic Overlayer Catalysts and the Effect of Oxygen Vacancy Concentration on Product Selectivity

et al. 2019

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“…The guaiacol was reacted with acetic acid with and without aqueous phase to produce long chain hydrocarbons. As expected, most of the acetic acid AQHDO products, were not detected and some of the guaiacol AQHDO products,, were also absent. The AQHDO products of this mixture were more complex than those for the individual reactants.…”

Section: Resultsmentioning

confidence: 99%

Aqueous Phase Synthesis of Hydrocarbons from Reactions of Guaiacol and Low Molecular Weight Oxygenates

Agblevor

Jahromi

2018

ChemCatChem

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Catalytic pyrolysis of lignocellulosic biomass generates water‐soluble low molecular weight oxygenates such as acetic acid, acetone, furfural, butanone, guaiacol, phenol and others in significant quantities that will affect the profitability of the biorefinery process. A new heterogeneous catalyst has been developed that catalyzes the reaction of carbonyl compounds with unsaturated ethers in aqueous medium to produce C6 to C15 hydrocarbons in a one‐pot synthesis. These reactions are called “carbonyl alkylations” because the carbonyl carbon chain was added to the aromatic ring and the oxygen was eliminated without loss of carbon. The C1 to C4 ketones and aldehydes produce alkylated benzenes while the C5 and higher carbonyl compounds alkylated the benzene ring and also opened the benzene ring to produce long chain internal alkene compounds. All the reactions occurred in the aqueous media at 300–350 °C on a supported nickel catalyst. The gaseous products included low molecular weight hydrocarbons such as methane, propane, butane, and pentane. Thus, it has been demonstrated for the first time that it is possible to produce a wide array of hydrocarbons from low molecular weight biomass derived oxygenates.

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“…The performance of NiCo bimetallic catalysts was better than that of monometallic Ni and Co catalyst, which could be attributed to the present of Ni−Co alloy resulting in the increased dispersion and stability of Ni active phase . Similarly, other alternatives like NiPd, PtCo, NiCu etc . exhibited an improvement in terms of HDO activity compared with their monometallic counterparts.…”

Section: Hydrodeoxygenation Using H2mentioning

confidence: 99%

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

et al. 2019

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Catalytic hydrodeoxygenation (HDO) is a fundamental process for bio-resources upgrading to produce transportation fuels or added value chemicals. The bottleneck of this technology to be implemented at commercial scale is its dependence on high pressure hydrogen, an expensive resource which utilization also poses safety concerns. In this scenario, the development of hydrogen-free alternatives to facilitate oxygen removal in biomass derived compounds is a major challenge for catalysis science but at the same time it could revolutionize biomass processing technologies. In this review we have analysed several novel approaches, including catalytic transfer hydrogenation (CTH), combined reforming and hydrodeoxygenation, metal hydrolysis and subsequent hydrodeoxygenation along with non-thermal plasma (NTP) to avoid the supply of external H 2 . The knowledge accumulated from traditional HDO sets the grounds for catalysts and processes development among the hydrogen alternatives. In this sense, mechanistic aspects for HDO and the proposed alternatives are carefully analysed in this work. Biomass model compounds are selected aiming to provide an in-depth description of the different processes and stablish solid correlations catalysts composition-catalytic performance which can be further extrapolated to more complex biomass feedstocks. Moreover, the current challenges and research trends of novel hydrodeoxygenation strategies are also presented aiming to spark inspiration among the broad community of scientists working towards a low carbon society where bio-resources will play a major role. Figure 1. Three basic phenylpropane monomers: (1) p-coumaryl alcohol; (2) coniferyl alcohol; (3) sinapyl alcohol.

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Hydrodeoxygenation of guaiacol over Ni@Pd and Ni@Pt bimetallic overlayer catalysts

Cited by 74 publications

References 74 publications

Kinetics of Furfural Hydrogenation over Bimetallic Overlayer Catalysts and the Effect of Oxygen Vacancy Concentration on Product Selectivity

Kinetics of Furfural Hydrogenation over Bimetallic Overlayer Catalysts and the Effect of Oxygen Vacancy Concentration on Product Selectivity

Aqueous Phase Synthesis of Hydrocarbons from Reactions of Guaiacol and Low Molecular Weight Oxygenates

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

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