Insight into the low-temperature DeNOx performance of copper-based oxides: Perspective from the valence state distribution

Li, Shan; Che, Yong; Liu, Lifei; Du, Yali; Wu, Xu

doi:10.1016/j.jcat.2023.05.004

Cited by 4 publications

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As presented in Figure a, the DMC selectivity and TOF show an increasing trend with the increment of temperature and reach the maximum at 393 K, which then decrease with a further increase of the temperature. The increase of the reaction temperature will accelerate the DMC formation rate, but the hydrolysis rate and side reaction rate of DMC will increase significantly at high reaction temperatures, resulting in low selectivity and yield of DMC. , In addition, the high temperature directly affects the exchange environment of the oxidation state between Cu(I) and Cu(II), which inhibit the catalytic cycling process, resulting in a low yield of DMC . As a typical gas volume reduction reaction, the TOF and DMC selectivities increase with the improvement of reaction pressure (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…17,33 In addition, the high temperature directly affects the exchange environment of the oxidation state between Cu(I) and Cu(II), which inhibit the catalytic cycling process, resulting in a low yield of DMC. 34 As a typical gas volume reduction reaction, the TOF and DMC selectivities increase with the improvement of reaction pressure (Figure 3b). Figure 3c displays the trend of DMC selectivity and yield of DMC versus the reaction time.…”

Section: Catalytic Performancementioning

confidence: 92%

See 1 more Smart Citation

Mechanistic Investigation of Oxidative Methanol Carbonylation with Mixed Cu(I)/Cu(II)–N-Methylimidazole Catalysts

Li,

Wang,

Liu

et al. 2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Copper complex catalysts exhibit excellent activity for the oxidative carbonylation of methanol to produce dimethyl carbonate (DMC). However, the reaction mechanism over Cu(I) or Cu(II) complex catalysts is not fully understood. In this study, homogeneous CuCl/CuCl 2 −NMI-m/n (N = N-methylimidazole; m/n = molar ratio of Cu(I) and Cu(II)) catalysts with organic ligand coordination are designed for oxidative carbonylation. The optimized CuCl/CuCl 2 −NMI-0.3/0.7 catalyst showed a TOF as high as 3.4 h −1 and a DMC selectivity of 67.2% based on oxygen, which were superior to those of CuCl−NMI or CuCl 2 −NMI. Our experiments suggested that the high activity and selectivity were assigned to the synergistic effect between Cu(I) and Cu(II), in which Cu(I) and Cu(II) are mainly responsible for the rapid generation of copper carbonyl and copper methoxy intermediates, respectively. This synergistic effect not only enhances the reaction activity but also ensures high DMC selectivity.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Catalytic Performancementioning

confidence: 92%