In situ DRIFTS study on the partial oxidation of ethylene over Co-ZSM-5 catalyst

Chen, Xiaomei; Yang, Xuefeng; Zhu, Ai‐Min; Fan, Hongyu; Wang, Xinkui; Xin, Qin; Zhou, Xinrui; Shi, Chuan

doi:10.1016/j.catcom.2008.09.028

Cited by 13 publications

(10 citation statements)

References 26 publications

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“…O 2 /He at 300°C. According to the results reported previously [14], Co 3 O 4 particles were responsible for the partial oxidation of C 2 H 4 to formate species (located at Co 2? ions) and O 2 promoted the oxidation of C 2 H 4 .…”

Section: Adsorption Of No and No ? Omentioning

confidence: 84%

“…According to the previous studies [14], the H 2 -TPR profile of Co-HZSM-5 indicated the presence of three major species on CoH-ZSM-5: Co 3 O 4 species, dispersed CoO x and isolated Co 2? at ion-exchange sites in the zeolitic matrix.…”

Section: Catalyst Characterizationmentioning

confidence: 96%

“…ions were active in the HC-SCR of NO, while dispersed Co 3 O 4 particles were undesired because they promoted the oxidation of hydrocarbon with oxygen rather than with NO 2 [5,11,12]. Nevertheless, some recent research [13,14] on HC-SCR revealed that Co oxide particles were found in active catalysts and could function catalytically. Cobalt-oxygen microaggregates or small clusters of cobalt oxide located inside the channels have been found to be the active sites in the CH 4 -SCR of NO over Co-ZSM-5 [13].…”

Section: Introductionmentioning

confidence: 93%

“…The CoH-ZSM-5 catalyst was prepared as described in our precious work by the thrice-repeated ion-exchange procedure at 80°C using H-ZSM-5 powders (SiO 2 /Al 2 O 3 = 25, Nankai University, China) and aqueous cobalt acetate solutions [14]. The content of Co in the Co-ZSM-5 catalyst was determined to be 1.7 wt.…”

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

“…Cobalt-oxygen microaggregates or small clusters of cobalt oxide located inside the channels have been found to be the active sites in the CH 4 -SCR of NO over Co-ZSM-5 [13]. In our previous work [14], Co-ZSM-5 was characterized by TPR and UV-vis techniques. It was found that three types Co species co-existed over Co-ZSM-5: Co 3 O 4 particles, dispersed CoO x and ion exchanged Co 2?…”

Section: Introductionmentioning

confidence: 97%

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The Role of Active Sites of CoH-ZSM-5 Catalysts for the C2H4-SCR of NO

Chen

Zhu

et al. 2010

Catal Lett

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The selective catalytic reduction of NO with ethylene was investigated and compared over fresh CoH-ZSM-5, H 2 -reduced (450°C) CoH-ZSM-5 and H-ZSM-5. The dispersion of cobalt species for fresh and H 2 -reduced CoH-ZSM-5 was studied by UV-vis and FTIR spectra. Combined with DRIFTS results of ad-species and reaction experiments, the active sites of CoH-ZSM-5 for the C 2 H 4 -SCR were identified and the catalytic functions of active cobalt species and support were also clarified. Notably, the formation of -CN or -NCO species was heavily dependent on the type of nitrates. Co 3 O 4 particles contributed to the oxidation of NO to bidentate nitrates. The latter species were crucial for the formation of -NCO. Whereas exchanged Co 2? ions facilitated the oxidation of NO to monodentate and/or bridged nitrates which participated in the formation of -CN species.

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Section: Adsorption Of No and No ? Omentioning

confidence: 84%

Section: Catalyst Characterizationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 93%

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

The Role of Active Sites of CoH-ZSM-5 Catalysts for the C2H4-SCR of NO

Chen

Zhu

et al. 2010

Catal Lett

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Charge Shielding Effect of Sodium Ions in Improving The Hydrophobicity and Performance of Co/Na‐SSZ‐13 Zeolite for Passive NO_x Adsorber

Chen,

Tao,

Yang

et al. 2024

Adv Funct Materials

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With increasingly stringent regulations, the reduction of NOx emissions during vehicle cold start is a major challenge. Pd‐modified zeolites are considered as the most promising passive NOx adsorber (PNA) for cold start NOx control. Nevertheless, the scarcity and the high cost of Pd limit its practical application. Herein, a non‐precious metal modified Co/Na‐SSZ‐13 zeolite for low‐temperature NOx adsorption is reported. This one‐pot synthesized Co/Na‐SSZ‐13 exhibits an extraordinary NOx storage capacity (212 µmol gcat−1) under humid conditions (3% H2O v/v), which is more than double that of conventional Co or Pd‐modified SSZ‐13. This is attributed to the absence of the inert cobalt phyllosilicate commonly found in conventional Co‐SSZ‐13, as well as the highly dispersed Co and Na ions as the effective NOx adsorption sites in Co/Na‐SSZ‐13. Moreover, the presence of Na ions shields the negative charge generated by the Al center and weakens the local electric field strength of the Al and Co centers. This lowers the H2O adsorption energy and improves the zeolite hydrophobicity, which enhances the NO storage capacity of the Co/Na‐SSZ‐13 under humid conditions. This work highlights the Co/Na‐SSZ‐13, synthesize via a simple and high‐efficiency method, as a promising substitute for noble metal PNA materials.

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Highly efficient catalytic conversion of biomass-derived 2,5-dimethylfuran into renewable p-xylene over zirconium phosphate catalysts

et al. 2023

Applied Catalysis A: General

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In situ DRIFTS study on the partial oxidation of ethylene over Co-ZSM-5 catalyst

Cited by 13 publications

References 26 publications

The Role of Active Sites of CoH-ZSM-5 Catalysts for the C2H4-SCR of NO

The Role of Active Sites of CoH-ZSM-5 Catalysts for the C2H4-SCR of NO

Charge Shielding Effect of Sodium Ions in Improving The Hydrophobicity and Performance of Co/Na‐SSZ‐13 Zeolite for Passive NO_x Adsorber

Highly efficient catalytic conversion of biomass-derived 2,5-dimethylfuran into renewable p-xylene over zirconium phosphate catalysts

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In situ DRIFTS study on the partial oxidation of ethylene over Co-ZSM-5 catalyst

Cited by 13 publications

References 26 publications

The Role of Active Sites of CoH-ZSM-5 Catalysts for the C2H4-SCR of NO

The Role of Active Sites of CoH-ZSM-5 Catalysts for the C2H4-SCR of NO

Charge Shielding Effect of Sodium Ions in Improving The Hydrophobicity and Performance of Co/Na‐SSZ‐13 Zeolite for Passive NOx Adsorber

Highly efficient catalytic conversion of biomass-derived 2,5-dimethylfuran into renewable p-xylene over zirconium phosphate catalysts

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Charge Shielding Effect of Sodium Ions in Improving The Hydrophobicity and Performance of Co/Na‐SSZ‐13 Zeolite for Passive NO_x Adsorber