Selective oxidation of p-chlorotoluene to p-chlorobenzaldehyde with molecular oxygen over zirconium-doped manganese oxide materials

Zhang, Teng; Deng, Yiqiang; Zhou, Wei‐Fang; Au, Chak Tong; Yin, Shuang‐Feng

doi:10.1016/j.cej.2013.10.094

Cited by 29 publications

(8 citation statements)

References 42 publications

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“…NO-TPD and H 2 -TPR tests were used to evaluate the oxidation performance of the catalysts. As can be seen from the NO-TPD results in Figure b, six desorption peaks were observed at 125, 175, 245, 315, 370, and 450 °C on the MnO x catalyst, which were attributed to the decomposition of different nitrate species. − The intensity of peaks III, V, and VI gradually decreased as the amount of SiO 2 -TEOS increased, and other peaks showed a trend of increase first and then decrease, indicating that the type and content of nitrate species have changed over SiO 2 ( x )@Mn catalysts. The formation of nitrate species was inherently an oxidation process of NO, and the addition of SiO 2 -TEOS caused a decrease in NO adsorption, which could be interpreted as a sign of the decline in the oxidation performance of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

Unveiling the SO₂ Resistance Mechanism of a Nanostructured SiO₂(x)@Mn Catalyst for Low-Temperature NH₃-SCR of NO

et al. 2023

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Low N2 selectivity and SO2 resistance of Mn-based catalysts for removal of NO x at low temperatures by NH3-SCR (selective catalytic reduction) technology are the two main intractable problems. Herein, a novel core–shell-structured SiO2@Mn catalyst with greatly improved N2 selectivity and SO2 resistance was synthesized by using manganese carbonate tailings as raw materials. The specific surface area of the SiO2@Mn catalyst increased from 30.7 to 428.2 m2/g, resulting in a significant enhancement in NH3 adsorption capacity due to the interaction between Mn and Si. Moreover, the N2O formation mechanism, the anti-SO2 poisoning mechanism, and the SCR reaction mechanism were proposed. N2O originated from the reaction of NH3 with O2 and the SCR reaction, as well as from the reaction of NH3 with the chemical oxygen of the catalyst. Regarding improving the SO2 resistance, DFT calculations showed that SO2 was observed to preferentially adsorb onto the surface of SiO2, thus preventing the erosion of active sites. Adding amorphous SiO2 can transform the reaction mechanism from Langmuir–Hinshelwood (L–H) to Eley–Rideal (E–R) by adjusting the formation of nitrate species to produce gaseous NO2. This strategy is expected to assist in designing an effective Mn-based catalyst for low-temperature NH3-SCR of NO.

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Section: Resultsmentioning

confidence: 99%

Unveiling the SO₂ Resistance Mechanism of a Nanostructured SiO₂(x)@Mn Catalyst for Low-Temperature NH₃-SCR of NO

et al. 2023

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“…Ceria/OMS-2 is the selective oxidation catalyst that gave the highest benzene selectivity of 99% at 300 °C. 86 Zirconium-doped OMS-2 catalyst for liquid phase oxidation of p -chlorotoluene to p -chlorobenzaldehyde was reported by Zhang et al 6 wt% Zr-OMS-2 gave 93% conversion of p -chlorotoluene and 86% selectivity of p -chlorobenzaldehyde at 100 °C in 10 h. 87…”

Section: Heterogeneous Catalysis In Selective Oxidation Reactionsmentioning

confidence: 99%

Advances and future trends in selective oxidation catalysis: a critical review

Yadav

Mewada

Wagh

et al. 2022

Catal. Sci. Technol.

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“…The co-existence of Mn 4+ , Mn 3+ , and Mn 2+ in cryptomelane makes the OMS-2 become very interesting materials with a variety of potential applications [6]. In particular, the OMS-2 has been reported as excellent catalysts for the oxidation of VOCs [7][8][9] and CO [10]. The modification or doping of the cryptomelane materials with transition metals or noble metals can greatly improve the catalytic performance of the OMS-2.…”

Section: Introductionmentioning

confidence: 98%

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts: Effect of Pd loading

Fu¹,

Li²,

Song³

et al. 2017

Front. Chem. Sci. Eng.

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The Pd catalyst supported on cryptomelanetype manganese oxide octahedral molecular sieve (OMS-2) were prepared. The effect of Pd loading on the catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over xPd/OMS-2 has been investigated. The results show that the Pd loading plays an important role on the physicochemical properties of the xPd/OMS-2 catalysts which outperform the Pd-free counterpart with the 0.5Pd/ OMS-2 catalyst being the best. The temperature for 50% conversion was 25, 240 and 160°C, and the temperature for 90% conversion was 55, 285 and 200°C for oxidation of CO, toluene, and ethyl acetate, respectively. The lowtemperature reducibility and high oxygen mobility of xPd/ OMS-2 are the factors contributable to the excellent catalytic performance of 0.5Pd/OMS-2.

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Selective oxidation of p-chlorotoluene to p-chlorobenzaldehyde with molecular oxygen over zirconium-doped manganese oxide materials

Cited by 29 publications

References 42 publications

Unveiling the SO₂ Resistance Mechanism of a Nanostructured SiO₂(x)@Mn Catalyst for Low-Temperature NH₃-SCR of NO

Unveiling the SO₂ Resistance Mechanism of a Nanostructured SiO₂(x)@Mn Catalyst for Low-Temperature NH₃-SCR of NO

Advances and future trends in selective oxidation catalysis: a critical review

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts: Effect of Pd loading

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Selective oxidation of p-chlorotoluene to p-chlorobenzaldehyde with molecular oxygen over zirconium-doped manganese oxide materials

Cited by 29 publications

References 42 publications

Unveiling the SO2 Resistance Mechanism of a Nanostructured SiO2(x)@Mn Catalyst for Low-Temperature NH3-SCR of NO

Unveiling the SO2 Resistance Mechanism of a Nanostructured SiO2(x)@Mn Catalyst for Low-Temperature NH3-SCR of NO

Advances and future trends in selective oxidation catalysis: a critical review

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts: Effect of Pd loading

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Product

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Unveiling the SO₂ Resistance Mechanism of a Nanostructured SiO₂(x)@Mn Catalyst for Low-Temperature NH₃-SCR of NO

Unveiling the SO₂ Resistance Mechanism of a Nanostructured SiO₂(x)@Mn Catalyst for Low-Temperature NH₃-SCR of NO