Effective hydrodeoxygenation of biomass-derived oxygenates into unsaturated hydrocarbons by MoO3 using low H2 pressures

Prasomsri, Teerawit; Nimmanwudipong, Tarit; Román‐Leshkov, Yuriy

doi:10.1039/c3ee24360e

Cited by 304 publications

(299 citation statements)

References 29 publications

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“…The reduction procedure and the presence of the H 2 atmosphere are key factors for the formation of this active molybdenum phase, along with oxygen vacancies, 44 resulting in the production of metallic/acidic bi-functional catalysts. [45][46][47] Effect of reaction parameters…”

Section: Catalytic Resultsmentioning

confidence: 99%

One-step propylene formation from bio-glycerol over molybdena-based catalysts

2015

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This work presents a novel, one-step catalytic process, enabling highly selective propylene formation via glycerol hydro-deoxygenation (HDO) reactions. Fe-Mo catalysts, supported on black and activated carbons, are selective towards C-O bond cleavage, thus converting glycerol to propylene with high yields. BET, XRD, TPD-NH 3 and TPD-He methods have been employed for the characterization of the samples. Molybdenum oxide, at its reduced state, is essential for driving selectively the reaction towards complete deoxygenation. The only product of glycerol HDO is propene, in the gas phase, while 2-propenol, propanols and propylene glycol have been detected, among others, in the liquid phase. Under the standard reaction conditions (300°C temperature, 8.0 MPa hydrogen pressure), glycerol conversion exceeds 88% and selectivity to propene reaches 76% after 6 hours of reaction. This study includes the investigation of the operating conditions effect (i.e. reaction time, reaction temperature, catalyst loading and H 2 pressure) regarding glycerol HDO towards propene formation.

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Section: Catalytic Resultsmentioning

confidence: 99%

One-step propylene formation from bio-glycerol over molybdena-based catalysts

2015

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“…Recently, our group and others showed that oxides with vacancies can catalyze hydrodeoxygenation of biomass-derived oxygenates [21][22][23]. To design a highly efficient ceria-based catalyst for this reaction, it is important to gain quantitative insight into the amount of reactive hydrogen present on the surface under reaction conditions as well as the kinetics and types of active sites necessary for dissociative adsorption of hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of hydrogen activation on ceria–zirconia

Schimming

Foo

LaMont

et al. 2015

Journal of Catalysis

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“…Several strategies have been proposed to improve bio-oil properties. An extensive amount of work has focused primarily on hydrodeoxygenation of phenolic compounds [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] while some work has focused on improving carbon retention and enhancing molecular weight mainly by alkylation reactions [19][20][21][22][23][24]. Molecular weight enhancement of bio-oil molecules may become important for the production of molecules with the appropriate length to use them as components of the gasoline and, particularly, of the diesel pools.…”

Section: Introductionmentioning

confidence: 99%

Tuning the acid–metal balance in Pd/ and Pt/zeolite catalysts for the hydroalkylation of m-cresol

Anaya

Zhang

Tan

et al. 2015

Journal of Catalysis

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a b s t r a c tThe liquid-phase hydroalkylation of m-cresol catalyzed by zeolite catalysts doped with noble metals was investigated at 473 K and 5200 kPa of H 2 . Metals (Pt and Pd) were incorporated in HY (Si/Al = 30) and HMor (Si/Al = 10) zeolites by incipient wetness impregnation. The structural properties of the samples were characterized by NMR, XPS, and BET. Hydroalkylation of m-cresol involves a series of steps that start with the ring saturation to 3-methylcyclohexanone (MCONE), which is the primary product and is further hydrogenated to methylcyclohexanol (MCNOL) on the metal function. This, in turn, is dehydrated on the acid sites to 3-methylcyclohexene, which readily alkylates the unreacted m-cresol to form bicyclic compounds that fall in the desirable fuel range. In these bifunctional catalysts, differences in intrinsic hydrogenation activity of metals play an important role in determining the final selectivity to alkylated products. In fact, the ratio of number of acid sites (n A ) to exposed metal sites (n M ) can be tuned to maximize the selectivity toward bicyclic compounds because this selectivity is determined by the fate of the intermediate 3-methylcyclohexene (MCENE). That is, if the C@C hydrogenation on the metal is fast compared to alkylation on the acid site, the selectivity decreases. However, if the hydrogenation is too slow, the overall product yield decreases. Thus, to optimize the hydroalkylation yield, a delicate metal/acid balance is required. Moreover, in the absence of metal, the zeolite would deactivate very quickly. Therefore, having the metal and acid functions together is also important for extending the catalyst life. Finally, it has been observed that 3D-pore zeolites, such as HY, are preferred over 1D-pore zeolites such as HMor, which sharply diminish the formation of alkylation compounds, despite being more acidic than HY.

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Effective hydrodeoxygenation of biomass-derived oxygenates into unsaturated hydrocarbons by MoO3 using low H2 pressures

Cited by 304 publications

References 29 publications

One-step propylene formation from bio-glycerol over molybdena-based catalysts

One-step propylene formation from bio-glycerol over molybdena-based catalysts

Kinetics of hydrogen activation on ceria–zirconia

Tuning the acid–metal balance in Pd/ and Pt/zeolite catalysts for the hydroalkylation of m-cresol

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