Double redox process to synthesize CuO–CeO2 catalysts with strong Cu–Ce interaction for efficient toluene oxidation

Zeng, Yiqing; Haw, Kok‐Giap; Wang, Zhigang; Wang, Yanan; Zhang, Shule; Hongmanorom, Plaifa; Zhong, Qin; Kawi, Sibudjing

doi:10.1016/j.jhazmat.2020.124088

Cited by 111 publications

(48 citation statements)

References 32 publications

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“…As a result, a large number of surface oxygen vacancies are used for the adsorption-activation of oxygen molecules, which improves the mobility of oxygen and accelerates the overall conversion rate. 55 In the reaction process, the dissociation enthalpy of the O-H bond is 104 kcal mol À1 in benzol RO-H and 88 kcal mol À1 in CHP ROO-H. 56 The rate of extracting hydrogen atoms (S2) from IPB molecules by ROc free radicals is much faster than that of hydrogen abstraction reaction (S1) between ROOc and IPB. 3 The formation of CHP and Rc (S2) becomes the control step of the whole radical chain reaction.…”

Section: Resultsmentioning

confidence: 99%

A new highly active La₂O₃–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

et al. 2021

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Section: Resultsmentioning

confidence: 99%

A new highly active La₂O₃–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

et al. 2021

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“…The versatile advantages of Cu-CeO x -MOF-n catalysts make them attractive for realistic environmental applications, particularly VOCs catalytic combustion. [20] combustion method 600 50,000 209 210 CuO-CeO 2 [47] calcination 500 50,000 211 231 Ce 0.8 Cu 0.2 O [45] surfactant precipitation method 5000 9000 >250 >250 CeCu-HT [48] hard-template method 10,000 66,000 221 223 Ce 0.4 Cu 0.6 [9] double redox method 500 50,000 h −1 228 245 CuCeZr 4 [49] sol-gel method 1500 24,000 h −1 183 219…”

Section: Catalytic Performancementioning

confidence: 99%

“…Numerous transition metal oxides are verified to be effective catalysts for toluene catalytic combustion. Cu- [9], Mn- [10], Co- [11] and Ce- [12] based oxides are widely researched due to their rich variety, low cost and long service life [13]. Toluene catalytic combustion process with transition metal oxide catalysts has been generally considered to follow the Mars-van Krevelen (MvK) mechanism [14,15].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Combustion of Toluene over Highly Dispersed Cu-CeOx Derived from Cu-Ce-MOF by EDTA Grafting Method

Sun

Huang

et al. 2021

Catalysts

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In this work, Cu-CeOx-MOF catalysts with well-dispersed Cu in different contents were synthesized via the ethylenediaminetetraacetic acid (EDTA) grafting method. EDTA was grafted in Ce-MOF-808 to anchor Cu and then the metal-organic frameworks (MOFs) were utilized as sacrificial template to form highly performed Cu-CeOx-MOF for toluene catalytic combustion. In this series of samples, Cu-CeOx-MOF-0.2 had a higher ratio of Oα/(Oα+Oβ), more oxygen vacancies and performed better low-temperature reducibility. Cu-CeOx-MOF-0.2 showed outstanding catalytic activity and stability. The T90 (temperature when toluene conversion achieved 90%) of Cu-CeOx-MOF-0.2 was 226 °C at 60,000 mL/(gcat∙h). In situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS) results revealed that the opening of aromatic ring and the deep oxidation of carboxylate were key steps for toluene catalytic combustion over Cu-CeOx-MOF-0.2.

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“…Nonetheless, the changes in the structures of the spinel oxides during the deactivation process were not investigated in detail. Zeng [17] developed highly active CuOÀ CeO 2 catalysts for the catalytic combustion of toluene by a double redox method. Strong CuOÀ CeO 2 interactions promoted the electron transfer between CuO and CeO 2 , which improved the redox properties of the CuOÀ CeO 2 À DR catalyst.…”

Section: Introductionmentioning

confidence: 99%

Study on the Performance of Copper‐Manganese Composite Oxide Catalysts for Toluene

Yang

2021

ChemistrySelect

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Copper-manganese (CuMn) composite oxide catalysts were prepared for the catalytic combustion of a common volatile organic compound, namely toluene. The structural properties of the catalysts were analysed by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) theory, X-ray photoelectron spectroscopy (XPS) and hydrogen temperature-programmed reduction (H 2 -TPR). The catalytic stability was examined after 100 h. It was found that Cu 1 Mn 1 exhibited the highest catalytic ability when the molar ratio of Cu : Mn was 1 : 1. The removal of toluene reached 90 % at a temperature below 229°C. It was speculated that the Cu 1.5 Mn 1.5 O 4 spinel structure and CuO were formed in the catalyst. The catalyst surface area was not the main factor affecting the catalytic activity. The catalysts displayed good stability and maintained high catalytic activity for a long time. Notably, fresh catalysts contained high amounts of high-valent Mn 4 + and Cu 2 + cations, which played important roles in the catalytic combustion of toluene. The cations initiated the redox process and led to the conversion of toluene to CO 2 and H 2 O. The reduced lattice oxygen supplied from air was transformed into surface oxygen on the catalyst. The catalytic combustion of toluene in the presence of CuMn composite oxide catalysts followed the Mars-van Krevelen mechanism.

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Double redox process to synthesize CuO–CeO2 catalysts with strong Cu–Ce interaction for efficient toluene oxidation

Cited by 111 publications

References 32 publications

A new highly active La₂O₃–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

A new highly active La₂O₃–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

Catalytic Combustion of Toluene over Highly Dispersed Cu-CeOx Derived from Cu-Ce-MOF by EDTA Grafting Method

Study on the Performance of Copper‐Manganese Composite Oxide Catalysts for Toluene

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Double redox process to synthesize CuO–CeO2 catalysts with strong Cu–Ce interaction for efficient toluene oxidation

Cited by 111 publications

References 32 publications

A new highly active La2O3–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

A new highly active La2O3–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

Catalytic Combustion of Toluene over Highly Dispersed Cu-CeOx Derived from Cu-Ce-MOF by EDTA Grafting Method

Study on the Performance of Copper‐Manganese Composite Oxide Catalysts for Toluene

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A new highly active La₂O₃–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

A new highly active La₂O₃–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation