Adsorption/reaction energetics measured by microcalorimetry and correlated with reactivity on supported catalysts: A review

Li, Lin; Lin, Jian; Li, Xiaoyü; Wang, Aiqin; Wang, Xiaodong; Zhang, Tao

doi:10.1016/s1872-2067(16)62578-0

Cited by 11 publications

(5 citation statements)

References 92 publications

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“…CO adsorption microcalorimetry was performed using a BT 2.15 heat-flux calorimeter (Seteram, France), the detailed procedures of which have been described earlier . The calorimeter was connected to a gas-handling and volumetric system employing MKS 698A Baratron Capacitance Manometers for precision pressure measurement (±1.33 × 10 –2 Pa).…”

Section: Methodsmentioning

confidence: 74%

Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeO_x for the Water-Gas Shift Reaction

et al. 2018

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Identification of size effects at an atomic level is essential for designing high-performance metal-based catalysts. Here, the performance of a series of FeO x -supported Pt catalysts with Pt as nanoparticles (Pt-NP) or single atoms (Pt-SAC) are compared for the low-temperature water-gas shift (WGS) reaction. A variety of characterization methods such as adsorption microcalorimetry, H2-TPR, in situ DRIFTS, and transient analysis of product tests were used to demonstrate that Pt nanoparticles exhibit much higher adsorption strength of CO; the adsorbed CO reacts with the OH groups, which are generated from activated H2O, to form intermediate formates that subsequently decompose to produce CO2 and H2 simultaneously. On the other hand, Pt single atoms promote the formation of oxygen vacancies on FeO x which dissociate H2O to H2 and adsorbed O that then combines with the weakly adsorbed CO on these Pt sites to produce CO2. The activation energy for the WGS reaction decreases with the downsizing of Pt species, and Pt-SAC possesses the lowest value of 33 kJ/mol. As a result, Pt-SAC exhibits 1 order of magnitude higher specific activity in comparison to Pt-NP. With a loading of only 0.05 wt % the Pt-SAC can achieve ∼65% CO conversion at 300 °C, representing one of the most active catalysts reported so far.

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Section: Methodsmentioning

confidence: 74%

Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeO_x for the Water-Gas Shift Reaction

et al. 2018

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“…Prior to the adsorption, the sample was prereduced by H 2 in a special treatment cell, followed by evacuation at 310°C for 30 min. The adsorption experiment was conducted at 40°C and the detailed procedures for microcalorimetric adsorption have been described earlier …”

Section: Methodsmentioning

confidence: 99%

“…The adsorption experiment was conducted at 408C and the detailed procedures for microcalorimetric adsorption have been described earlier. 33 In situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) spectra were collected with a BRUKER Equinox 70 spectrometer, equipped with a MCT detector and operated at a resolution of 4 cm 21 for 128 scans. Before each measurement, the catalyst was reduced in situ by 10 vol % H 2 /He at a specific temperature according to TPR results for 30 min, then purged with He for 30 min.…”

Section: Catalyst Characterizationmentioning

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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“…Chemisorption combined with temperature programmed desorption (TPD) is a widely used approach to derive the number and strength of these sites over ceria. Adsorption calorimetry can also serve the similar purpose [14,15] and is probably the most direct method for measuring the surface acid-base sites in both quantitative and energetic ways. Through the measurement of the adsorbed quantity of a suitable probe molecule and the simultaneously evolved heat at increasing coverage, the concentration and strength of acid and base sites can be quantified.…”

Section: Introductionmentioning

confidence: 99%

In situ spectroscopic insights into the redox and acid-base properties of ceria catalysts

Wang

2021

Chinese Journal of Catalysis

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Adsorption/reaction energetics measured by microcalorimetry and correlated with reactivity on supported catalysts: A review

Cited by 11 publications

References 92 publications

Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeO_x for the Water-Gas Shift Reaction

Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeO_x for the Water-Gas Shift Reaction

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

In situ spectroscopic insights into the redox and acid-base properties of ceria catalysts

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Adsorption/reaction energetics measured by microcalorimetry and correlated with reactivity on supported catalysts: A review

Cited by 11 publications

References 92 publications

Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeOx for the Water-Gas Shift Reaction

Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeOx for the Water-Gas Shift Reaction

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

In situ spectroscopic insights into the redox and acid-base properties of ceria catalysts

Contact Info

Product

Resources

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Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeO_x for the Water-Gas Shift Reaction

Identifying Size Effects of Pt as Single Atoms and Nanoparticles Supported on FeO_x for the Water-Gas Shift Reaction

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