Role of Re in Pt-Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study.

K.G.H. Azzam; Igor V. Babych; Kulathuiyer Seshan; Leonardus Lefferts

doi:10.1016/j.apcatb.2007.11.015

Role of Re in Pt-Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study.

K.G.H. Azzam, Igor V. Babych, Kulathuiyer Seshan, Leonardus Lefferts

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Transient kinetic studies and in situ FTIR spectroscopy were used to follow the reaction sequences that occur during water gas shift (WGS) reaction over Pt–Re/TiO2 catalyst. Results pointed to contributions of an associative formate route with redox regeneration and two classical redox routes involving TiO2 and ReOx, respectively. Under WGS reaction condition rhenium is present at least partly as ReOx providing an additional redox route for WGS reaction in which ReOx is reduced by CO generating CO2 and re-oxidized by H2O forming H2. The overall reaction rate, based on steady state kinetics, was given by rH2=0.075e31 kJmol-1/RTxpH2O x pH2-0.5(1-β), where β is the approach to equilibrium. Results obtained in the study indicated that the reaction between CO adsorbed on Pt and OH groups on titania is the rate-determining step.

Original language	Undefined
Pages (from-to)	129-140
Number of pages	12
Journal	Applied catalysis B: environmental
Volume	80
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcatb.2007.11.015
Publication status	Published - 2008

Keywords

IR-78951
METIS-250577
Water gas shift (WGS)
Reaction orders
Kinetics
Rhenium
Platinum
Titania
Reaction mechanism

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10.1016/j.apcatb.2007.11.015

Cite this

@article{835ffe72633343958585322e34b74da7,

title = "Role of Re in Pt-Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study.",

abstract = "Transient kinetic studies and in situ FTIR spectroscopy were used to follow the reaction sequences that occur during water gas shift (WGS) reaction over Pt–Re/TiO2 catalyst. Results pointed to contributions of an associative formate route with redox regeneration and two classical redox routes involving TiO2 and ReOx, respectively. Under WGS reaction condition rhenium is present at least partly as ReOx providing an additional redox route for WGS reaction in which ReOx is reduced by CO generating CO2 and re-oxidized by H2O forming H2. The overall reaction rate, based on steady state kinetics, was given by rH2=0.075e31 kJmol-1/RTxpH2O x pH2-0.5(1-β), where β is the approach to equilibrium. Results obtained in the study indicated that the reaction between CO adsorbed on Pt and OH groups on titania is the rate-determining step.",

keywords = "IR-78951, METIS-250577, Water gas shift (WGS), Reaction orders, Kinetics, Rhenium, Platinum, Titania, Reaction mechanism",

author = "K.G.H. Azzam and Babych, {Igor V.} and Kulathuiyer Seshan and Leonardus Lefferts",

year = "2008",

doi = "10.1016/j.apcatb.2007.11.015",

language = "Undefined",

volume = "80",

pages = "129--140",

journal = "Applied catalysis B: environmental",

issn = "0926-3373",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Role of Re in Pt-Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study.

AU - Azzam, K.G.H.

AU - Babych, Igor V.

AU - Seshan, Kulathuiyer

AU - Lefferts, Leonardus

PY - 2008

Y1 - 2008

N2 - Transient kinetic studies and in situ FTIR spectroscopy were used to follow the reaction sequences that occur during water gas shift (WGS) reaction over Pt–Re/TiO2 catalyst. Results pointed to contributions of an associative formate route with redox regeneration and two classical redox routes involving TiO2 and ReOx, respectively. Under WGS reaction condition rhenium is present at least partly as ReOx providing an additional redox route for WGS reaction in which ReOx is reduced by CO generating CO2 and re-oxidized by H2O forming H2. The overall reaction rate, based on steady state kinetics, was given by rH2=0.075e31 kJmol-1/RTxpH2O x pH2-0.5(1-β), where β is the approach to equilibrium. Results obtained in the study indicated that the reaction between CO adsorbed on Pt and OH groups on titania is the rate-determining step.

AB - Transient kinetic studies and in situ FTIR spectroscopy were used to follow the reaction sequences that occur during water gas shift (WGS) reaction over Pt–Re/TiO2 catalyst. Results pointed to contributions of an associative formate route with redox regeneration and two classical redox routes involving TiO2 and ReOx, respectively. Under WGS reaction condition rhenium is present at least partly as ReOx providing an additional redox route for WGS reaction in which ReOx is reduced by CO generating CO2 and re-oxidized by H2O forming H2. The overall reaction rate, based on steady state kinetics, was given by rH2=0.075e31 kJmol-1/RTxpH2O x pH2-0.5(1-β), where β is the approach to equilibrium. Results obtained in the study indicated that the reaction between CO adsorbed on Pt and OH groups on titania is the rate-determining step.

KW - IR-78951

KW - METIS-250577

KW - Water gas shift (WGS)

KW - Reaction orders

KW - Kinetics

KW - Rhenium

KW - Platinum

KW - Titania

KW - Reaction mechanism

U2 - 10.1016/j.apcatb.2007.11.015

DO - 10.1016/j.apcatb.2007.11.015

M3 - Article

VL - 80

SP - 129

EP - 140

JO - Applied catalysis B: environmental

JF - Applied catalysis B: environmental

SN - 0926-3373

IS - 1-2

ER -