New catalyst for selective oxidation of CO in excess H2 designing of the active catalyst having different optimum temperature

Shou, Masashi; Tanaka, Kenichi; Yoshioka, Kunishige; Moro‐oka, Yoshihiko; Nagano, Susumu

doi:10.1016/j.cattod.2004.04.049

Cited by 52 publications

(31 citation statements)

References 14 publications

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“…DRFT-IR (Diffuse Reflectance Fourier Transform IR) spectroscopy showed that the main adsorbed form on the FeO x /Pt/TiO 2 catalyst is the bridge bonded CO [2,3,8], which is quite different from the linearly adsorbed CO on a 5% Pt/Al 2 O 3 added a small amount of Fe-oxide reported by Korotkikh and Parrauto [11,12] and Sakamoto et al [13]. In addition, the oxidation of CO with O 2 on the FeOx/Pt/TiO 2 catalyst is markedly accelerated in the presence of H 2 and/or H 2 O, but no such enhancement occurs on the Pt/TiO 2 catalyst.…”

Section: Resultsmentioning

confidence: 99%

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Isotope effect of H2/D2 and H2O/D2O for the PROX reaction of CO on the FeOx/Pt/TiO2 catalyst

Shou

Tanaka

2006

Catal Lett

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The oxidation reaction of CO with O 2 on the FeOx/Pt/TiO 2 catalyst is markedly enhanced by H 2 and/or H 2 O, but no such enhancement occurs on the Pt/TiO 2 catalyst. Isotope effects were studied by H 2 /D 2 and H 2 O/D 2 O on the FeOx/Pt/TiO 2 catalyst, and almost the same magnitude of isotope effect of ca. 1.4 was observed for the enhancement of the CO conversion by H 2 /D 2 as well as by H 2 O/D 2 O at 60°C. This result suggests that the oxidation of CO with O 2 via such intermediates as formate or bicarbonate in the presence of H 2 O, in which H 2 O or D 2 O acts as a molecular catalyst to promote the oxidation of CO as described below. KEY WORDS: PROX reaction of CO; Isotope effect of H 2 /D 2 and H 2 O/D 2 O; Molecular catalysis of H 2 O; A new PROX catalyst; FeO X loaded Pt/TiO 2 catalyst.

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Section: Resultsmentioning

confidence: 99%

“…Our previous studies discovered a new PROX catalyst (preferential oxidation of CO in H 2 ) by loading a large amount of FeO x on supported Pt catalysts [1,2,3]. The oxidation of CO on this catalyst is markedly enhanced by adding H 2 and/or H 2 O [4].…”

Section: Introductionmentioning

confidence: 96%

Isotope effect of H2/D2 and H2O/D2O for the PROX reaction of CO on the FeOx/Pt/TiO2 catalyst

Shou

Tanaka

2006

Catal Lett

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“…The systems of CO/oxide-supported Pt and CO/Pt single crystal surfaces have been frequently studied by FTIR and other methods. Brandt et al [6] have reported the adsorption of CO on Pt/SiO 2 and they observed one band at 2057 cm −1 and a small shoulder at 2067 cm −1 , which were attributed to CO adsorbed on corner Pt atoms.Tanaka et al [7,8] have studied the activity performance of Pt/TiO 2 , Pt/CeO 2 and FeO x /Pt/CeO 2 catalysts for the selective oxidation of CO in excess of H 2 . The in situ DRIFTS method was used to identify the process of CO adsorption and transformation [9].…”

Section: Introductionmentioning

confidence: 99%

DRIFTS investigation and DFT calculation of the adsorption of CO on Pt/TiO2, Pt/CeO2 and FeOx/Pt/CeO2

Gao

et al. 2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Tanaka et al [12][13][14][15][16] found unusual catalytic activity with Pt/TiO 2 and Au/ TiO 2 covered with a large amount of FeO x (ca. 100 wt% in Fe) for the oxidation of CO in the presence of H 2 , that is, H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Catalytic oxidation of CO on metals involving an ionic process in the presence of H₂O: the role of promoting materials

Tanaka

Yuan

2015

RSC Adv.

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A new catalytic oxidation of CO involving an ionic process in the presence of H 2 O is proposed on a Ptcatalyst with specific promoting materials (co-catalysts). Oxidation of CO is very slow at room temperature on ordinary Pt-catalysts such as Pt/SiO 2 , Pt/Al 2 O 3 , Pt/TiO 2 , Pt/Graphite, and Pt/carbon nano-tube (CNT), and H 2 or H 2 O have no effect on the reaction. However, in the presence of specific co-catalysts, the oxidation of CO is markedly enhanced by H 2 or H 2 O, so that highly selective preferential oxidation (PROX) of CO in H 2 is attained. The role that co-catalysts play in the oxidation of The highly selective oxidation of CO in H 2 on the Pt/CNT and Pt/CNF catalysts strongly suggests efficient transport of ionic intermediates from Ni-MgO or FeO x to Pt over the hydrophobic CNT and CNF surface according to the local potential gradient. According to this mechanism, selectivity in the preferential oxidation of CO in H 2 is defined by the turnover number of a H 2 O molecule forming CO 2 during its residence time on the catalyst, which is essentially different from the selectivity based on competitive adsorption and/or reaction. The role of the H 2 O molecule is as a kind of messenger molecule or a molecular catalyst to promote the reaction on the surface expressed by the equation n(CO + 1/2O 2 ) + H 2 O / nCO 2 + H 2 O. In this mechanism, the selectivity is given by n/(n + 1). Curious phenomena previously observed in the PROX reaction of CO in H 2 on various catalysts are well explained by the mechanism including an ionic process proposed in this paper.

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New catalyst for selective oxidation of CO in excess H2 designing of the active catalyst having different optimum temperature

Cited by 52 publications

References 14 publications

Isotope effect of H2/D2 and H2O/D2O for the PROX reaction of CO on the FeOx/Pt/TiO2 catalyst

Isotope effect of H2/D2 and H2O/D2O for the PROX reaction of CO on the FeOx/Pt/TiO2 catalyst

DRIFTS investigation and DFT calculation of the adsorption of CO on Pt/TiO2, Pt/CeO2 and FeOx/Pt/CeO2

Catalytic oxidation of CO on metals involving an ionic process in the presence of H₂O: the role of promoting materials

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New catalyst for selective oxidation of CO in excess H2 designing of the active catalyst having different optimum temperature

Cited by 52 publications

References 14 publications

Isotope effect of H2/D2 and H2O/D2O for the PROX reaction of CO on the FeOx/Pt/TiO2 catalyst

Isotope effect of H2/D2 and H2O/D2O for the PROX reaction of CO on the FeOx/Pt/TiO2 catalyst

DRIFTS investigation and DFT calculation of the adsorption of CO on Pt/TiO2, Pt/CeO2 and FeOx/Pt/CeO2

Catalytic oxidation of CO on metals involving an ionic process in the presence of H2O: the role of promoting materials

Contact Info

Product

Resources

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Catalytic oxidation of CO on metals involving an ionic process in the presence of H₂O: the role of promoting materials