CO<sub>2</sub> reverse water‐gas shift reaction on mesoporous M‐CeO<sub>2</sub> catalysts

Dai, Bican; Zhou, Guilin; Ge, Shaobing; Xie, Hongmei; Jiao, Zhaojie; Zhang, Guizhi; Xiong, Kun

doi:10.1002/cjce.22730

Cited by 125 publications

(62 citation statements)

References 26 publications

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“…The strong adsorption ability of the catalyst for H species can induce reactant H 2 and CO 2 molecules to generate competitive adsorption. This is not conducive to the adsorption and activation of reactant CO 2 molecules and affects the catalytic performance of the corresponding catalyst …”

Section: Figurementioning

confidence: 99%

“…This is not conducive to the adsorption and activation of reactant CO 2 molecules and affects the catalytic performance of the corresponding catalyst. [35] The catalytic performance in RWGS of different catalysts was evaluated at various temperatures under a relatively high space velocity of 150,000 mL/g/h (Figure 2c). For comparison, nanoparticles catalysts (Cu, Cr 2 O 3 ) and traditional metal/oxide catalyst (IÀ Cu/Cr 2 O 3 ) were prepared.…”

Section: Facile Preparation Of Inverse Nanoporous Cr 2 O 3 /Cu Catalymentioning

confidence: 99%

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Facile Preparation of Inverse Nanoporous Cr₂O₃/Cu Catalysts for Reverse Water‐Gas Shift Reaction

et al. 2019

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The inverse oxide/metal structures represent a new class of heterogeneous catalysts with great research interests due to their diverse interfacial structures between oxides and metal supports, which often lead to unique catalytic properties. Herein, we report a facile and general strategy to prepare inverse catalysts with nanoporous structures by dealloying. As an example, inverse nanoporous Cr2O3/Cu (NP−Cr2O3/Cu) catalysts with a bi‐continuous nanoporous structure are fabricated by room temperature chemical dealloying of CrCuAl alloy in alkaline solution, which exhibit excellent performance in CO2 reduction to CO (reverse water‐gas shift, RWGS), significantly higher performance than the traditional Cu/Cr2O3 catalyst and inverse catalysts obtained by other traditional preparation methods. Density functional theory (DFT) calculation results show that CO2 reduction is evidently promoted by the synergistic effects of Cr2O3 cluster and nanoporous Cu. These results suggest a promising route for the preparation of various heterogeneous catalysts with tailored functionalities.

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Section: Figurementioning

confidence: 99%

Section: Facile Preparation Of Inverse Nanoporous Cr 2 O 3 /Cu Catalymentioning

confidence: 99%

Facile Preparation of Inverse Nanoporous Cr₂O₃/Cu Catalysts for Reverse Water‐Gas Shift Reaction

et al. 2019

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“…Generally, engineers employ TPR to identify optimal reduction conditions for a catalyst, e.g., for Fisher–Tropsch, hydrogenation, dehydrogenation, and hydrodeoxygenation, reverse water gas shift reactions, and reforming catalysts. Rives et al characterized anionic clays by reducing the different cations included in the matrix structure.…”

Section: Applicationsmentioning

confidence: 99%

Experimental methods in chemical engineering: Temperature programmed reduction—TPR

2018

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Temperature programmed reduction (TPR) characterizes the oxido‐reduction properties of bulk and supported catalysts. H2 or CO passes over a pre‐conditioned solid sample as a furnace ramps the temperature at a constant rate. A thermal conductivity detector (TCD) or mass spectrometer records the effluent concentration. In the pre‐conditioning step, Ar or He flushes residual air and absorbed water from the solid sample to maximize the signal‐to‐noise ratio of the TCD signal. We calculate the number of active sites based on the detector signal that correlates with how much hydrogen reacts. The temperature at which it begins to react represents the minimum activation temperature. TPR is cheap, fast, easy to run, and the data is straightforward to interpret. The technique is more popular with chemical engineers than with the broader scientific community. Among the 27 articles that Can. J. Chem. Eng. published in 2016 and 2017 that apply TPR to analyze catalysts, 22 mention reactors, 20 report XRD spectra, 18 mention gas chromatography, and another 15 quantify surface area by BET. Synergy with other temperature programmed methods is lower, as only 5 mention temperature programmed desorption, 5 thermal gravimetric analysis, and 3 temperature programmed oxidation.

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“…Another article combined a homemade H 2 temperature programmed reduction reactor with an MS to study Fischer‐Tropsch synthesis with a Co based catalyst on

γ - {Al}_{2} O_{3}

. () Three articles mention inductively coupled plasma with MS (ICP‐MS), one of which prepared mesoporous metal‐CeO 2 catalysts for the reverse water gas shift reaction,() while another article studied polyethylenimine capped copper nanoparticles to oxidatively degrade organic pollutants for water treatment. () Eight articles mention HPLC electrospray ionization‐mass spectrometry but combining gas chromatography with MS is by far the most common combination with 16 articles of the 30.…”

Section: Introductionmentioning

confidence: 99%

Experimental Methods in Chemical Engineering: Mass Spectrometry—MS

2019

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Mass spectrometry identifies the atomic mass of molecules and fragments in the gas phase. The spectrometer ionizes the molecules that then pass through an electric or magnetic field towards a detector. The field modifies the molecule's trajectory and we infer mass from its direction and velocity in a static field or from the stability of its path in a dynamic field. The electric current is amplified and a mass spectrum is generated from the location or timing of the signal from the detector, translated into a plot of the intensity as a function of the mass-over-charge ratio. It is field deployable, measures concentrations in real time with a temporal resolution better than 100 ms, and detection limits of fg. However, the signal drifts with time so we have to calibrate it as frequently as every hour. Calibrating requires multiple mixtures with varying concentrations to map the non-linear response. The Web of Science Core Collection indexed over 60 000 articles that refer to MS (2016 and 2017) with applications ranging from permanent gas analysis, to identifying protein, forensic science, and natural products. The bibliometric software VOSViewer [1] identified four clusters of research related to MS: (1) proteomics, proteins, plasma, and metabolomics; (2) solid phase extraction together with gas chromatography; (3) tandem mass spectrometry and liquid chromatography; and (4) waste water and toxicity. We expect that the technique will continue to evolve with increased sensitivity, lower drift, and greater specificity. Miniaturization efforts should also continue in order to develop faster field deployable instruments.

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CO₂ reverse water‐gas shift reaction on mesoporous M‐CeO₂ catalysts

Cited by 125 publications

References 26 publications

Facile Preparation of Inverse Nanoporous Cr₂O₃/Cu Catalysts for Reverse Water‐Gas Shift Reaction

Facile Preparation of Inverse Nanoporous Cr₂O₃/Cu Catalysts for Reverse Water‐Gas Shift Reaction

Experimental methods in chemical engineering: Temperature programmed reduction—TPR

Experimental Methods in Chemical Engineering: Mass Spectrometry—MS

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CO2 reverse water‐gas shift reaction on mesoporous M‐CeO2 catalysts

Cited by 125 publications

References 26 publications

Facile Preparation of Inverse Nanoporous Cr2O3/Cu Catalysts for Reverse Water‐Gas Shift Reaction

Facile Preparation of Inverse Nanoporous Cr2O3/Cu Catalysts for Reverse Water‐Gas Shift Reaction

Experimental methods in chemical engineering: Temperature programmed reduction—TPR

Experimental Methods in Chemical Engineering: Mass Spectrometry—MS

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Product

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CO₂ reverse water‐gas shift reaction on mesoporous M‐CeO₂ catalysts

Facile Preparation of Inverse Nanoporous Cr₂O₃/Cu Catalysts for Reverse Water‐Gas Shift Reaction

Facile Preparation of Inverse Nanoporous Cr₂O₃/Cu Catalysts for Reverse Water‐Gas Shift Reaction