Self-sustained combustion of carbon monoxide promoted by the Cu-Ce/ZSM-5 catalyst in CO/O 2 /N 2 atmosphere

Bin, Feng; Wei, Xiaolin; Li, Bo; Hui, K.S.

doi:10.1016/j.apcatb.2014.07.007

Cited by 84 publications

(43 citation statements)

References 32 publications

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“…A more in-depth M-K mechanism was considered by Jia et al [17], and its kinetic rate expression indicates that the surface CuO particles provide sites for CO chemisorption and that the lattice oxygen of the Ce 1-x Cu x O 2-σ solid solution can be active in CO oxidation over CuO-CeO 2 catalysts. Our previous investigation confirmed the pathways of CO chemisorption onto Cu + /Cu 2+ sites and the reaction of CO with lattice oxygen via the M-K mechanism for CO oxidation over CuCe/ZSM-5 catalysts [18]. However, Liu and Flytzani-Stephanopoulos [19] interpreted the CO oxidation behavior using a different rate expression that includes CO and O 2 adsorbing onto CuO-CeO 2 catalysts via the Langmuir-Hinshelwood (L-H) mechanism.…”

Section: Introductionsupporting

confidence: 58%

Reaction mechanism and kinetics of CO oxidation over a CuO/Ce0.75Zr0.25O2-δ catalyst

Kang

Wei

Bin

et al. 2018

Applied Catalysis A: General

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A B S T R A C T The CuO/Ce 0.75 Zr 0.25 O 2δ and Ce 0.75 Zr 0.25 O δ catalysts were prepared by the sol-gel method, and Cu 0.07 Ce 0.75 Zr 0.25 O 2-δ was obtained by treating CuO/Ce 0.75 Zr 0.25 O 2δ with nitric acid to remove the well-dispersed CuO on the surface. Various characterizations were used to reveal the different active sites, such as surface-dispersed CuO and Cu-Ce-Zr-O δ solid solutions in CuO/Ce 0.75 Zr 0.25 O 2δ , Cu-Ce-Zr-O δ solid solutions in Cu 0.07 Ce 0.75 Zr 0.25 O 2-δ and Ce-Zr-O δ solid solutions in Ce 0.75 Zr 0.25 O δ . The Raman and O 2 -TPD results showed that the concentration of oxygen vacancies in Cu-Ce-Zr-O δ solid solutions was higher than that in Ce-Zr-O δ solid solutions. CO oxidation testing suggested that the catalytic activity decreases in the order of CuO/ Ce 0.75 Zr 0.25 O 2δ > Cu 0.07 Ce 0.75 Zr 0.25 O 2-δ > Ce 0.75 Zr 0.25 O δ .Combined with the in situ diffuse-reflectance Fourier transform (in situ DRIFT) results, the reaction sensitivity followed the order of CO linear chemisorption onto dispersed CuO x species (Mars-van Krevelen mechanism) > carbonate species onto a Cu-Ce-Zr-O δ solid solution (Langmuir-Hinshelwood mechanism) > carbonate species onto a Ce-Zr-O δ solid solution (Langmuir-Hinshelwood mechanism). Kinetic studies suggested that the power-law rate expressions and apparent activation energies were r = 6.02 × 10 −7 ×P CO 0.68 P O2 0.03 (53 ± 3 kJ/mol) for CuO/Ce 0.75 Zr 0.25 O 2δ , r = 5.86 × 10 −7 ×P CO 0.8 P O2 0.07 (105 ± 5 kJ/mol) for Cu 0.07 Ce 0.75 Zr 0.25 O 2-δ and r = 5.7 × 10 −7 ×P CO 0.75 P O2 0.12 (115 ± 6 kJ/mol) for Ce 0.75 Zr 0.25 O δ . The Mars-van Krevelen mechanism should be the crucial reaction pathway over CuO/Ce 0.75 Zr 0.25 O 2δ in CO interfacial reactions, although the Langmuir-Hinshelwood mechanism cannot be ignored, and the Langmuir-Hinshelwood mechanism mainly occurred over the Cu 0.07 Ce 0.75 Zr 0.25 O 2-δ and Ce 0.75 Zr 0.25 O δ catalysts, where the contribution from the Mars-van Krevelen mechanism was negligible due to the absence of surface CuO x species.

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Section: Introductionsupporting

confidence: 58%

Reaction mechanism and kinetics of CO oxidation over a CuO/Ce0.75Zr0.25O2-δ catalyst

Kang

Wei

Bin

et al. 2018

Applied Catalysis A: General

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“…3 39,40 Thus, it was understandable that the surface areas of the catalysts gradually reduced as the amount of cerium increasing. Furthermore, the HC-SCR performance of the Cu and CuCe-x catalysts was displayed in Fig.…”

Section: The Effect Of C 3 H 6 On the Nh 3 -Scr Of Cu And Cuce Catmentioning

confidence: 99%

Cerium promotion on the hydrocarbon resistance of a Cu-SAPO-34 NH₃-SCR monolith catalyst

Cao

Feng

et al. 2015

Catal. Sci. Technol.

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CuCe-SAPO-34 (CuCe-x) catalysts with 3 wt% Cu and various contents of Ce for selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) were prepared by wet co-impregnation method. The activities of CuCe-x catalysts were better than that of Cu-SAPO-34 (Cu). In addition, hydrocarbons (HCs) resistance of the CuCe-x catalysts was examined and compared to that of Cu catalyst. The NH 3 -SCR performance after UV-vis-DRS and H 2 -TPR results confirmed that the addition of Ce could inhibit the aggregation of CuO crystallites and increase the amount of isolated copper ions. Furthermore, the NH 3 -TPD and TGA results demonstrated that the addition of Ce decreased the amount and strength of strong acid sites, so that the amounts of C 3 H 6 /O 2 adsorption on CuCe-x catalysts were lower than that on Cu catalyst. Therefore, activity and HCs resistance of Cu-SAPO-34 was improved by the addition of Ce.

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“…It has been reported that CO induces a slow induction activation process on the surface, depending on the CO feed-stream concentration [14]. Our materials presented activity at higher temperatures than reported in the literature for similar materials [14,15], probably due to the CO feed-stream concentration SiO 2 209 -240.0 231 231 227 95 MOR 333 ------CuMOR 337 ------CuMOR1-5%-SiO 2 240 224 227 265 276 --CuMOR1-15%-SiO 2 251 253 241 243 263 313 309 CuMOR1-50%-SiO 2 318 355 333 341 380 373 327 CuMOR2-5%-SiO 2 238 224 298 321 324 330 342 CuMOR2-15%-SiO 2 288 253 279 274 289 317 365 a Instrumental error 6 AE m 2 g À1 . used in our experiments, as well as to the lack of an extra feed gas for the activation process (NH 3 ) [15].…”

Section: Resultsmentioning

confidence: 99%

Insight into copper-mordenite–silica mixtures (CuMOR–SiO2)

Bedolla-Valdez¹,

León²,

Alonso-Núñez³

et al. 2015

Comptes Rendus. Chimie

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Self-sustained combustion of carbon monoxide promoted by the Cu-Ce/ZSM-5 catalyst in CO/O 2 /N 2 atmosphere

Cited by 84 publications

References 32 publications

Reaction mechanism and kinetics of CO oxidation over a CuO/Ce0.75Zr0.25O2-δ catalyst

Reaction mechanism and kinetics of CO oxidation over a CuO/Ce0.75Zr0.25O2-δ catalyst

Cerium promotion on the hydrocarbon resistance of a Cu-SAPO-34 NH₃-SCR monolith catalyst

Insight into copper-mordenite–silica mixtures (CuMOR–SiO2)

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Self-sustained combustion of carbon monoxide promoted by the Cu-Ce/ZSM-5 catalyst in CO/O 2 /N 2 atmosphere

Cited by 84 publications

References 32 publications

Reaction mechanism and kinetics of CO oxidation over a CuO/Ce0.75Zr0.25O2-δ catalyst

Reaction mechanism and kinetics of CO oxidation over a CuO/Ce0.75Zr0.25O2-δ catalyst

Cerium promotion on the hydrocarbon resistance of a Cu-SAPO-34 NH3-SCR monolith catalyst

Insight into copper-mordenite–silica mixtures (CuMOR–SiO2)

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Cerium promotion on the hydrocarbon resistance of a Cu-SAPO-34 NH₃-SCR monolith catalyst