The surface construction of Mo–O–Bi coordination for high catalytic performance in gas-phase epoxidation of propylene with O<sub>2</sub>

Xu, Yanting; Guo, Lijuan; Chen, Xiaohui; Huang, Qingming

doi:10.1039/c7cy02526b

Cited by 10 publications

(4 citation statements)

References 41 publications

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“…Surface analyses of those catalysts were carried out using X‐ray photoelectron spectroscopy (XPS). As showed in Figure , the peaks of 232.45 eV, 284.8 eV, 399.24 eV, 532.07 eV are attributed to Mo3d, C1s, N1s, O1s, respectively, while Cl (200.51 eV) is only observed for DMSBC‐2 (Figure d). Furthermore, the wide scan spectra which curve‐fitting into major two peaks with the binding energy values of 232.60 and 235.7 eV for the Mo3d level, were attributed to Mo 3d 5/2 and Mo 3d 3/2 , respectively (Figure b, e, h) and proved that the Mo is the 6+ oxidation state (Figure b, e, h) .…”

Section: Resultsmentioning

confidence: 87%

Remarkable binuclear Schiff‐based complex catalyze the epoxidation of alkenes: effects of substituent group

Guo

Zou

et al. 2020

Applied Organom Chemis

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A series of dimolybdenum metal catalysts with different ligand have been successfully synthesized and used to catalyze the epoxidation of alkenes to generate epoxides by using tert‐butyl‐hydroperoxide (TBHP) as oxidant. The reaction condition was optimized by the adjustment of some key parameters, such as, temperature, to target high catalytic performance. The oxidation of cyclooctene gave 95.00% conversion and almost 100.00% selectivity. Kinetic study of the oxidation of cyclooctene under different temperature was taken out, indicating the reaction have good catalytic performance. Furthermore, it is calculated from the Arrhenius equation that different functional groups affect the activation energy of the reaction. The electron donor group substituent on the liagnd increases the catalytic activity by reducing the activation energy, and vice versa. Finally, a possible catalytic mechanism has been proposed by measuring the electronic absorption spectrum of the reaction.

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Section: Resultsmentioning

confidence: 87%

Remarkable binuclear Schiff‐based complex catalyze the epoxidation of alkenes: effects of substituent group

Guo

Zou

et al. 2020

Applied Organom Chemis

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“…Another work which employed Cu/SiO 2 as a composite catalyst came to the similar conclusion (selectivity of 17.0%, conversion of 3.2%) . Although much efforts have been made toward the direct epoxidation of propylene with molecular oxygen, the reaction mechanism and active phase while using Cu-based catalysts still remain vague and contradictory. ,− …”

Section: Introductionmentioning

confidence: 72%

Insight into the Effect of Copper Substitution on the Catalytic Performance of LaCoO₃-Based Catalysts for Direct Epoxidation of Propylene with Molecular Oxygen

Lei

Dai

Tan

et al. 2021

ACS Sustainable Chem. Eng.

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Direct epoxidation of propylene to propylene oxide (PO) with molecular oxygen as the most atomically economical route remains challenging due to the low PO yield. In this study, CuO supported on perovskites (LaCoO 3 ) modified with NaCl was found to be active for direct epoxidation of propylene with oxygen. LaCo x Cu 1−x O 3− modified with alkali metal salts were further fabricated to improve catalytic performance with the assistance of citric acid. Among the investigated catalysts, LaCo 0.8 Cu 0.2 O 3−δ exhibited the best catalytic performance, with a PO formation rate of 60.4 g PO •kg cat −1•h −1 (PO selectivity of 10.2% and propylene conversion of 12.0%) at a lower temperature (250 °C). The characterization results indicate that Cu-doped LaCoO 3 catalysts with enhanced oxygen vacancies and abundant electrophilic oxygen species are crucial to selectively attack on CC bond instead of C−H bond. Besides, LaCo x Cu 1−x O 3−δ catalysts demonstrated higher propylene conversion and more stable catalytic performance. This work exemplifies the direct propylene epoxidation with molecular oxygen employing perovskite materials.

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“…Other silica and metal oxides supported Mo catalysts also show synergistic enhancement for olefin epoxidation reactions . For example, Xu et al . reported MoO 3 /Bi x Si 1‐x O 2 catalysts with high catalytic performance in gas‐phase epoxidation of propylene with O 2 .…”

Section: Mo‐based Catalystsmentioning

confidence: 99%

“…Other silica and metal oxides supported Mo catalysts also show synergistic enhancement for olefin epoxidation reactions. [103] For example, Xu et al [104] reported MoO 3 /Bi x Si 1-x O 2 catalysts with high catalytic performance in gas-phase epoxidation of propylene with O 2 . They observed the facile aggregation of active metal species limited the activity of the MoO 3 /Bi x Si 1-x O 2 catalysts.…”

Section: Othersmentioning

confidence: 99%

Recent Advances in Facile Liquid Phase Epoxidation of Light Olefins over Heterogeneous Molybdenum Catalysts

Yan

Liu

Wang

et al. 2019

The Chemical Record

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Molybdenum complexes are versatile and efficient for liquid phase olefin epoxidation reactions. Rational design of catalysts is critical to achieve high atom efficiency during epoxidation processes. Although liquid phase epoxidation has been a popular topic for decades, three key issues, (a) rational control of morphology of molybdenum nanoparticles, (b) manipulating metal‐support interaction and (c) altering electronic configuration at molybdenum center remains unsolved in this area. Therefore, in this paper, we have critically revised recent research progress on heterogeneous molybdenum catalysts for facile liquid phase olefin epoxidation in terms of catalyst synthesis, surface characterization, catalytic performance and structure‐function relationship. Furthermore, plausible reaction mechanisms will be systematically discussed with the aim to provide insights into fundamental understanding on novel epoxidation chemistry.

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The surface construction of Mo–O–Bi coordination for high catalytic performance in gas-phase epoxidation of propylene with O₂

Abstract: Mo–O–Bi coordination was achieved by support modification in which MoO3 was anchored on the support, resulting in dramatically enhanced catalytic performance.

Cited by 10 publications

References 41 publications

Remarkable binuclear Schiff‐based complex catalyze the epoxidation of alkenes: effects of substituent group

Remarkable binuclear Schiff‐based complex catalyze the epoxidation of alkenes: effects of substituent group

Insight into the Effect of Copper Substitution on the Catalytic Performance of LaCoO₃-Based Catalysts for Direct Epoxidation of Propylene with Molecular Oxygen

Recent Advances in Facile Liquid Phase Epoxidation of Light Olefins over Heterogeneous Molybdenum Catalysts

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The surface construction of Mo–O–Bi coordination for high catalytic performance in gas-phase epoxidation of propylene with O2

Abstract: Mo–O–Bi coordination was achieved by support modification in which MoO3 was anchored on the support, resulting in dramatically enhanced catalytic performance.

Cited by 10 publications

References 41 publications

Remarkable binuclear Schiff‐based complex catalyze the epoxidation of alkenes: effects of substituent group

Remarkable binuclear Schiff‐based complex catalyze the epoxidation of alkenes: effects of substituent group

Insight into the Effect of Copper Substitution on the Catalytic Performance of LaCoO3-Based Catalysts for Direct Epoxidation of Propylene with Molecular Oxygen

Recent Advances in Facile Liquid Phase Epoxidation of Light Olefins over Heterogeneous Molybdenum Catalysts

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The surface construction of Mo–O–Bi coordination for high catalytic performance in gas-phase epoxidation of propylene with O₂

Insight into the Effect of Copper Substitution on the Catalytic Performance of LaCoO₃-Based Catalysts for Direct Epoxidation of Propylene with Molecular Oxygen