MOF-derived CeO2 supported Ag catalysts for toluene oxidation: The effect of synthesis method

Wang, Yuxin; Bi, Fukun; Wang, Yunyun; Jia, Minghan; Tao, Xuefen; Jin, Yinxiu; Zhang, Xiaodong

doi:10.1016/j.mcat.2021.111922

Cited by 48 publications

(15 citation statements)

References 65 publications

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“…26 In order to investigate the textural structures of the BCN and CNNS, nitrogen adsorption-desorption isotherms were measured and displayed. 27,28 As shown in Fig. 2b, both of these samples exhibited representative type IV isotherms with H 3 hysteresis loops, confirming the mesoporous features.…”

Section: Resultssupporting

confidence: 66%

Facile preparation of graphitic carbon nitride nanosheet/agar composite hydrogels for removal of tetracycline via the synergy of adsorption and photocatalysis

Wang

Wei

2022

New J. Chem.

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Section: Resultssupporting

confidence: 66%

Facile preparation of graphitic carbon nitride nanosheet/agar composite hydrogels for removal of tetracycline via the synergy of adsorption and photocatalysis

Wang

Wei

2022

New J. Chem.

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“…On the contrary, direct precursor calcination has shown a great potential for the direct preparation of catalysts [ 18 , 19 , 20 , 21 , 22 ]. In the latter approach, promising results have been reported for direct calcination of metal–organic frameworks (MOFs) at moderate temperatures (300–500 °C) [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. Indeed, depending on the employed linkers, MOF synthesis can be very simple and cheap [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

MOF-Derived CeO2 and CeZrOx Solid Solutions: Exploring Ce Reduction through FTIR and NEXAFS Spectroscopy

et al. 2023

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The development of Ce-based materials is directly dependent on the catalyst surface defects, which is caused by the calcination steps required to increase structural stability. At the same time, the evaluation of cerium’s redox properties under reaction conditions is of increasing relevant importance. The synthesis of Ce-UiO-66 and CeZr-UiO-66 and their subsequent calcination are presented here as a simple and inexpensive approach for achieving homogeneous and stable CeO2 and CeZrOx nanocrystals. The resulting materials constitute an ideal case study to thoroughly understand cerium redox properties. The Ce3+/Ce4+ redox properties are investigated by H2-TPR experiments exploited by in situ FT-IR and Ce M5-edge AP-NEXAFS spectroscopy. In the latter case, Ce3+ formation is quantified using the MCR-ALS protocol. FT-IR is then presented as a high potential/easily accessible technique for extracting valuable information about the cerium oxidation state under operating conditions. The dependence of the OH stretching vibration frequency on temperature and Ce reduction is described, providing a novel tool for qualitative monitoring of surface oxygen vacancy formation. Based on the reported results, the molecular absorption coefficient of the Ce3+ characteristic IR transition is tentatively evaluated, thus providing a basis for future Ce3+ quantification through FT-IR spectroscopy. Finally, the FT-IR limitations for Ce3+ quantification are discussed.

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“…Although these modifications successfully improved the chlorine resistance of the catalysts, their catalytic activity decreased to a certain extent compared with that of the corresponding supported noble metal catalysts. Recently, a promising method for the preparation of supported noble metal catalysts has been reported via using metal–organic frameworks (MOFs) as the sacrificial templates. − The abundant porous structure of MOFs can restrict the growth of noble metal particles and improve their distributions. For example, Xiao et al prepared Pd NPs@Co 3 O 4 from Pd NPs@ZIF, in which the presence of electron transfer from Co 3 O 4 to Pt species enhanced the activation ability of O 2 , boosting the degradation of toluene .…”

Section: Introductionmentioning

confidence: 99%

Chlorine-Coordinated Pd Single Atom Enhanced the Chlorine Resistance for Volatile Organic Compound Degradation: Mechanism Study

Zhao

Yang

et al. 2022

Environ. Sci. Technol.

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120

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The development of catalysts with high chlorine resistance for volatile organic compound (VOC) degradation is of great significance to achieve air purification. Herein, Pd@ZrO2 catalysts with monodispersed Pd atoms coordinated with Cl were prepared using an in situ grown Zr-based metal–organic framework (MOF) as the sacrifice templates to enhance the chlorine resistance for VOC elimination. The residual Cl species from the Zr-MOF coordinated with Pd, forming Pd1–Cl species during the pyrolysis. Meanwhile, abundant oxygen vacancies (VO) were generated, which enhanced the adsorption and activation of gaseous oxygen molecules, accelerating the degradation of VOCs. In addition, the Pd@ZrO2 catalysts exhibited satisfactory water resistance, long-term stability, and great resistance to CO and dichloromethane (DCM) for VOC elimination. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) results elucidated that the generation of Pd1–Cl species in Pd@ZrO2 suppressed the absorption of DCM, releasing more active sites for toluene and its intermediate adsorption. Simultaneously, the monodispersed Pd atoms and VO improved the reactivity of gaseous oxygen molecule adsorption and dissociation, boosting the deep decomposition of toluene and its intermediates. This work may provide a new strategy for rationally designing high-chlorine resistance catalysts for VOC elimination to improve the atmospheric environment.

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MOF-derived CeO2 supported Ag catalysts for toluene oxidation: The effect of synthesis method

Cited by 48 publications

References 65 publications

Facile preparation of graphitic carbon nitride nanosheet/agar composite hydrogels for removal of tetracycline via the synergy of adsorption and photocatalysis

Facile preparation of graphitic carbon nitride nanosheet/agar composite hydrogels for removal of tetracycline via the synergy of adsorption and photocatalysis

MOF-Derived CeO2 and CeZrOx Solid Solutions: Exploring Ce Reduction through FTIR and NEXAFS Spectroscopy

Chlorine-Coordinated Pd Single Atom Enhanced the Chlorine Resistance for Volatile Organic Compound Degradation: Mechanism Study

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