Low temperature water gas shift: the link between the catalysis of WGS and formic acid decomposition over Pt/ceria

Jacobs, Gary; Patterson, Patricia M.; Graham, Uschi M.; Crawford, Adam C.; Davis, Burtron H.

doi:10.1016/j.ijhydene.2005.03.001

Cited by 81 publications

(49 citation statements)

References 28 publications

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“…We have also recently demonstrated some preliminary results that showed that doping of the Pd/C and Pt/C catalysts with K carbonate had a significant promotional effect on the rate of formic acid decomposition [16]; this work was stimulated by reports that alkali metals have a strong promotional effect on the water-gas shift (WGS) reaction [25][26][27][28], the mechanism of which is probably closely related to that of formic acid decomposition [17,18,22]. Our results showed that the temperature required for formic acid decomposition was decreased to <353 K, the rate of hydrogen production being increased considerably (by 1-2 orders of magnitude) by 5 doping with K carbonate.…”

Section: Introductionmentioning

confidence: 94%

“…This demand can be achieved by careful choice of a catalyst and reaction conditions and a significant amount of work on the decomposition of formic acid is currently in progress aimed at finding suitable combinations. Hydrogen production from formic acid using heterogeneous catalysts has therefore been studied widely in both the liquid [10][11][12][13][14] and vapour [15][16][17][18][19][20][21][22] phases.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen production from formic acid vapour over a Pd/C catalyst promoted by potassium salts: Evidence for participation of buffer-like solution in the pores of the catalyst

Liu

Bulushev

Beloshapkin

et al. 2014

Applied Catalysis B: Environmental

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(D.A. Bulushev) 2 A B S T R A C T Doping a 1 wt.% Pd/C catalyst with alkali metal carbonates has a very significant promotional effect on its activity in hydrogen production from the decomposition of formic acid vapour (2 vol.%, 1 bar), potassium and caesium carbonates giving the largest effects. The K carbonate species present on the fresh catalysts react with formic acid to form formate ions, these being dissolved in a formic acid/water solution condensed in the pores of the support. The steadystate activities of the samples containing formate ions were 1-2 orders of magnitude greater than those of the unpromoted Pd/C and CO content was lower than 30 ppm. The activation energies for the reaction increased with doping from 66 to 88-99 kJ mol -1 , relatively independent of the cation of the dopant. Similar but lesser effects were found with unsupported Pd nanocrystals doped with K carbonate. The rate-determining step for the promoted samples appears to be the decomposition of formate ions on the Pd surface.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Hydrogen production from formic acid vapour over a Pd/C catalyst promoted by potassium salts: Evidence for participation of buffer-like solution in the pores of the catalyst

Liu

Bulushev

Beloshapkin

et al. 2014

Applied Catalysis B: Environmental

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“…Formate (HCOO) as additional reactive surface intermediate has been discussed in the literature [72][73][74]; it is bonded to the surface through its oxygen atom. Carboxyl and formate intermediates are isomers and both have been detected experimentally over different transition metals [73,[75][76][77][78][79]. Tibiletti et al [78] identified formate, carbonate and carboxyl species at the surface of a Pt/CeO2 catalyst during the forward water-gas shift (WGS) and the reverse reaction (RWGS).…”

Section: Cooh On Ni Surfacementioning

confidence: 99%

Surface Reaction Kinetics of Steam- and CO2-Reforming as Well as Oxidation of Methane over Nickel-Based Catalysts

et al. 2015

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An experimental and kinetic modeling study on the Ni-catalyzed conversion of methane under oxidative and reforming conditions is presented. The numerical model is based on a surface reaction mechanism consisting of 52 elementary-step like reactions with 14 surface and six gas-phase species. Reactions for the conversion of methane with oxygen, steam, and CO2 as well as methanation, water-gas shift reaction and carbon formation via Boudouard reaction are included. The mechanism is implemented in a one-dimensional flow field description of a fixed bed reactor. The model is evaluated by comparison of numerical simulations with data derived from isothermal experiments in a flow reactor over a powdered nickel-based catalyst using varying inlet gas compositions and operating temperatures. Furthermore, the influence of hydrogen and water as co-feed on methane dry reforming with CO2 is also investigated.

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“…A review as to whether a redox mechanism or surface formate mechanism operates over Pt/ceria for WGS and RWGS is included in our previous investigations [9][10][11][12][13][14][15][16] and will not be reproduced here. Briefly, the two mechanisms are as illustrated below:…”

Section: Introductionmentioning

confidence: 99%

Reverse water-gas shift reaction: steady state isotope switching study of the reverse water-gas shift reaction using in situ DRIFTS and a Pt/ceria catalyst

Jacobs

Davis

2005

Applied Catalysis A: General

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Low temperature water gas shift: the link between the catalysis of WGS and formic acid decomposition over Pt/ceria

Cited by 81 publications

References 28 publications

Hydrogen production from formic acid vapour over a Pd/C catalyst promoted by potassium salts: Evidence for participation of buffer-like solution in the pores of the catalyst

Hydrogen production from formic acid vapour over a Pd/C catalyst promoted by potassium salts: Evidence for participation of buffer-like solution in the pores of the catalyst

Surface Reaction Kinetics of Steam- and CO2-Reforming as Well as Oxidation of Methane over Nickel-Based Catalysts

Reverse water-gas shift reaction: steady state isotope switching study of the reverse water-gas shift reaction using in situ DRIFTS and a Pt/ceria catalyst

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