Ce-Co interaction effects on the catalytic performance of uniform mesoporous Cex-Coy catalysts in Hg0 oxidation process

Zhang, Xiaopeng; Wang, Jinxin; Tan, Bojian; Zhang, Ning; Bao, Junjiang; He, Gaohong

doi:10.1016/j.fuel.2018.03.158

Cited by 30 publications

(14 citation statements)

References 51 publications

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“…The XRD patterns of the three catalysts are shown in Figure . The diffraction pattern for the catalysts has six peaks at 19, 31.27, 38.62, 44.81, 59.35, and 65.23°, corresponding to the (111), (220), (311), (400), (422), and (440) facets (JCPDS 43-1003) . Compared to those of Co 3 O 4 -NS and Co 3 O 4 -SM, the diffraction peaks of Co 3 O 4 -CP are sharper and more intense, and the Scherrer size of Co 3 O 4 -CP is larger (23.623) (Table ), which indicates that it has a higher degree of crystallinity .…”

Section: Resultsmentioning

confidence: 99%

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Zhu

Song

Han

et al. 2020

Environ. Sci. Technol.

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Oxygen vacancies can capture and activate gaseous oxygen, forming surface chemisorbed oxygen, which plays an important role in the Hg 0 oxidation process. Fine control of oxygen vacancies is necessary and a major challenge in this field. A novel method for facet control combined with morphology control was used to synthesize Co 3 O 4 nanosheets preferentially growing (220) facet to give more oxygen vacancies. X-ray photoelectron spectroscopy (XPS) results show that the (220) facet has a higher Co 3+ /Co 2+ ratio, leading to more oxygen vacancies via the Co 3+ reduction process. Density functional theory (DFT) calculations confirm that the (220) facet has a lower oxygen vacancy formation energy. Furthermore, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results suggest that Co 3 O 4 nanosheets yield more defects during the synthesis process. These results are the reasons for the greater number of oxygen vacancies in Co 3 O 4 nanosheets, which is confirmed by electron energy loss spectroscopy (EELS), Raman spectroscopy, and photoluminescence (PL) spectroscopy. Therefore, Co 3 O 4 nanosheets show excellent Hg 0 removal efficiency over a wide temperature range of 100−350 °C at a high gas hourly space velocity (GHSV) of 180 000 h −1 . Additionally, the catalytic efficiency of Co 3 O 4 nanosheets is still greater than 83%, even after 80 h of testing, and it recovers to its original level after 2 h of in situ thermal treatment at 500 °C.

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Section: Resultsmentioning

confidence: 99%

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Zhu

Song

Han

et al. 2020

Environ. Sci. Technol.

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“…The pore size distribution curves (shown in Figure S2B) further confirmed this conclusion. Additionally, from Table , it is observed that S BET of CeO 2 @Co 3 O 4 decreased when adding cerium, which was attributed to the sintering of CeO 2 …”

Section: Resultsmentioning

confidence: 91%

“…Additionally, from Table 1, it is observed that S BET of CeO 2 @Co 3 O 4 decreased when adding cerium, which was attributed to the sintering of CeO 2 . 27 The Raman spectra are exhibited in Figure 3. Five peaks at 195, 480, 521, 629, and 692 cm −1 are detected of Co 3 O 4 .…”

Section: Resultsmentioning

confidence: 99%

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Fang

Chen

Zhou

et al. 2020

Ind. Eng. Chem. Res.

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In this work, a core–shell structured CeO2@Co3O4 catalyst was successfully prepared by using a zeolitic imidazolate framework-based material as a sacrificial template. The structure, morphology, and physicochemical characteristics of these materials were investigated by X-ray diffraction, N2 sorption, Fourier transform infrared spectroscopy, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and temperature-programmed reduction studies. Compared with pure Co3O4 and CeO2, the CeO2@Co3O4 sample displayed superior catalytic performance (T 90 = 225 °C) toward toluene oxidation. Results demonstrated that the CeO2@Co3O4 sample exhibited a core–shell structure, with hierarchically wrinkled surfaces. This unique structure, especially the interface between the core and the shell, endowed the CeO2@Co3O4 catalyst with better activity. In addition, there was a synergistic effect between cerium and cobalt oxides in the core–shell bimetallic sample, which was responsible for the improved performance of the material. Moreover, surface-active oxygen species involved and played a significant role in toluene oxidation.

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“…S9 †), by which the suitable selection of the bimetallic combination could be predicted. [89][90][91][92] The results are shown in Table S6, † which were calculated by DFT (Fig. S10 †).…”

Section: 24mentioning

confidence: 99%

Terpyridine-based Pd(ii)/Ni(ii) organometallic framework nano-sheets supported on graphene oxide—investigating the fabrication, tuning of catalytic properties and synergetic effects

Ren

Wang

et al. 2020

RSC Adv.

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Ce-Co interaction effects on the catalytic performance of uniform mesoporous Cex-Coy catalysts in Hg0 oxidation process

Cited by 30 publications

References 51 publications

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Terpyridine-based Pd(ii)/Ni(ii) organometallic framework nano-sheets supported on graphene oxide—investigating the fabrication, tuning of catalytic properties and synergetic effects

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Ce-Co interaction effects on the catalytic performance of uniform mesoporous Cex-Coy catalysts in Hg0 oxidation process

Cited by 30 publications

References 51 publications

Co3O4 Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Co3O4 Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Zeolitic Imidazolate Framework-67-Derived CeO2@Co3O4 Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Terpyridine-based Pd(ii)/Ni(ii) organometallic framework nano-sheets supported on graphene oxide—investigating the fabrication, tuning of catalytic properties and synergetic effects

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Product

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Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation