Role of alkali metal in a highly active Pd/alkali/Fe2O3 catalyst for water gas shift reaction

Watanabe, Ryo; Sakamoto, Yuji; Yamamuro, Keisuke; Tamura, Shigeru; Kikuchi, Eiichi; Sekine, Yasushi

doi:10.1016/j.apcata.2013.03.010

Cited by 27 publications

(13 citation statements)

References 33 publications

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“… 13 , 14 , 20 Also, the decrease in the reducibility of the samples causes a shift to higher reduction temperature ( Figure 3 , curves c and d). A similar phenomenon is observed in the case of alkali-doped Pd/Fe 2 O 3 29 and alkali-doped Pt/CeO 2 catalysts. 30 Moreover, the decrease in the reducibility of the catalysts at higher Na loading of 2 and 5% can also be proved by the results of XPS analysis ( Table 1 ).…”

Section: Resultssupporting

confidence: 81%

Addition of Sodium Additives for Improved Performance of Water-Gas Shift Reaction over Ni-Based Catalysts

Wang

et al. 2021

ACS Omega

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The effect of Na loading on water-gas shift reaction (WGSR) activity of Ni@TiO x -XNa (X = 0, 0.5, 1, 2, and 5 wt %) catalysts has been investigated. Herein, we report sodium-modified Ni@TiO x catalysts (denoted as Ni@TiO x -XNa) derived from Ni3Ti1-layered double hydroxide (Ni3Ti1-LDH) precursor. The optimized Ni@TiO x -1Na catalyst exhibits enhanced catalytic performance toward WGSR at relatively low temperature and reaches an equilibrium CO conversion at 300 °C, which is much superior to those for most of the reported Ni-based catalysts. The H2-temperature-programmed reduction (H2-TPR) result demonstrates that the Ni@TiO x -1Na catalyst has a stronger metal–support interaction (MSI) than the sodium-free Ni@TiO x catalyst. The presence of stronger MSI significantly facilitates the electron transfer from TiO x support to the interfacial Ni atoms to modulate the electronic structure of Ni atoms (a sharp increase in Niδ− species), inducing the generation of more surface sites (Ov–Ti3+) accompanied by more interfacial sites (Niδ−–Ov–Ti3+), revealed by X-ray photoelectron spectroscopy (XPS). The Niδ−–Ov–Ti3+ interfacial sites serve as dual-active sites for WGSR. The increase in the dual-active sites accounts for improvement in the catalytic performance of WGSR. With the tunable Ni–TiO x interaction, a feasible strategy in creating active sites by adding low-cost sodium addictive has been developed.

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Section: Resultssupporting

confidence: 81%

Addition of Sodium Additives for Improved Performance of Water-Gas Shift Reaction over Ni-Based Catalysts

Wang

et al. 2021

ACS Omega

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“…These results suggest that the support FeO x is reduced to Fe 3 O 4 by CO with the release of CO 2 , that is, oxygen vacancies are generated correspondingly. A recent transient response experiment with isotope O species suggested that CO can be oxidized by lattice oxygen in Fe 2 O 3 during WGS . When switching off the gas flow of CO and exposing the reduced FeO x to H 2 O, it is of interest to note that the baseline moves down but not completely compared to the original state.…”

Section: Discussionmentioning

confidence: 99%

“…A recent transient response experiment with isotope O species suggested that CO can be oxidized by lattice oxygen in Fe 2 O 3 during WGS. 51 When switching off the gas flow of CO and exposing the reduced FeO x to H 2 O, it is of interest to note that the baseline moves down but not completely compared to the original state. The XRD results in Figure 11 show that the catalyst still exhibits a phase of Fe 3 53 One of the methods to distinguish these two mechanisms is in virtue of temperature-programmed surface reaction experiments (TPSR-MS) under WGS stream.…”

Section: Discussionmentioning

confidence: 99%

FeO_x supported single‐atom Pd bifunctional catalyst for water gas shift reaction

et al. 2017

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Water gas shift reaction on supported noble metal catalysts is an essential process for upgrading hydrogen source industrially. Here a series of Pd/FeOx catalysts were detected for this reaction with Pd/Al2O3 as reference. It was found that Pd/FeOx exhibited higher CO conversion than Pd/Al2O3 with a good stability even in the presence of CO2 and H2. Along the loading decreasing, the turnover frequency of exposed Pd atoms increased with the dispersion from subnanometer (∼1 nm) to single atoms. Various characterizations suggested that Pd single atoms greatly enhanced the reducibility of FeOx and facilitated the formation of oxygen vacancies, which served as sites to promote the dissociation of H2O to form H2 and atomic O. The atomic O was ready to react with the linear adsorbed CO species on Pd single‐atom sites through a redox mechanism, which resulted in low activation energy of ∼30 kJ mol−1. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4022–4031, 2017

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“…19,20 Zhai et al 21 also found that the alkali-doped Pt catalysts showed an enhanced catalytic activity by the formation of Pt-alkali-O x (OH) y species. Watanabe et al 22 found that the oxidation rate of CO by lattice oxygen was promoted by the addition of K 2 O for Pd/Fe 2 O 3 catalyst over for WGS reaction. Bulushev et al 23 found that the rate of hydrogen production from the decomposition of formic acid over Pd/C catalyst could be improved by 1-2 orders of magnitude by the addition of potassium ions (K + ).…”

Section: Introductionmentioning

confidence: 99%

The effect of the alkali additive on the highly active Ru/C catalyst for water gas shift reaction

Liu

Huang

Zhang

et al. 2014

Catal. Sci. Technol.

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Role of alkali metal in a highly active Pd/alkali/Fe2O3 catalyst for water gas shift reaction

Cited by 27 publications

References 33 publications

Addition of Sodium Additives for Improved Performance of Water-Gas Shift Reaction over Ni-Based Catalysts

Addition of Sodium Additives for Improved Performance of Water-Gas Shift Reaction over Ni-Based Catalysts

FeO_x supported single‐atom Pd bifunctional catalyst for water gas shift reaction

The effect of the alkali additive on the highly active Ru/C catalyst for water gas shift reaction

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Role of alkali metal in a highly active Pd/alkali/Fe2O3 catalyst for water gas shift reaction

Cited by 27 publications

References 33 publications

Addition of Sodium Additives for Improved Performance of Water-Gas Shift Reaction over Ni-Based Catalysts

Addition of Sodium Additives for Improved Performance of Water-Gas Shift Reaction over Ni-Based Catalysts

FeOx supported single‐atom Pd bifunctional catalyst for water gas shift reaction

The effect of the alkali additive on the highly active Ru/C catalyst for water gas shift reaction

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FeO_x supported single‐atom Pd bifunctional catalyst for water gas shift reaction