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    Study of an Na2WO4/Mn7SiO12-SiO2 oxygen-carrier catalyst for chemical looping-oxidative coupling of methane
    Ya GAO, Weidong SUN, Guofeng ZHAO, Ye LIU, Yong LU
    Journal of East China Normal University(Natural Science)    2023, 2023 (1): 95-103.   DOI: 10.3969/j.issn.1000-5641.2023.01.010
    Abstract250)   HTML10)    PDF (1059KB)(123)      

    A promising chemical looping-oxidative coupling of methane (CL-OCM) oxygen-carrier catalyst, Na2WO4/Mn7SiO12-SiO2, was obtained by adding extra Mn2O3 to Mn2O3-Na2WO4/SiO2 and in-situ activating in the reaction stream. After experiencing an induction period, the oxygen-carrier phase transformed from Mn2O3 to Mn7SiO12 in association with an improvement in C2-C3 selectivity but decreased CH4 conversion. The Na2WO4/Mn7SiO12-SiO2 oxygen-carrier catalysts could also be obtained by directly calcining the Na2WO4/Mn2O3-SiO2 precursor at 800 ℃ in air. At 750 ℃ and a CH4 residence time of 12 s, the catalyst achieved 12% (or 7%) CH4 conversion and 81.5% (or 90.0%) C2-C3 selectivity using a mCat/mCH4 weight ratio of 27 (or 13.5). Notably, only C3H6 was detected as C3 products, whose selectivity was about 5%. The CL-OCM reaction proceeded selectively through the redox cycle mode of Mn7SiO12 $ \leftrightarrow $ [MnSiO3 + MnWO4]. The lattice-oxygen mobility in Mn7SiO12 was much weaker than that in Mn2O3, which improved C2-C3 selectivity but decreased CH4 conversion. Our findings provide guidance for the exploration of more advanced catalytic oxygen-carrier catalysts toward efficient CL-OCM process.

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    Progress in synthesis of methyl glyoxylate by selective oxidation of methyl glycolate with molecular oxygen
    Hao WANG, Guofeng ZHAO, Yong LU
    Journal of East China Normal University(Natural Science)    2023, 2023 (1): 104-113.   DOI: 10.3969/j.issn.1000-5641.2023.01.011
    Abstract462)   HTML7)    PDF (834KB)(263)      

    Methyl glyoxylate is widely used in organic synthesis and chemical production. The application of traditional preparation methods is limited by high cost, low efficiency, and significant environmental pollution. During the coal to ethylene glycol process, methyl glycolate is produced as an intermediate product of the hydrogenation of dimethyl oxalate (DMO) to ethylene glycol. Methyl glycolate can be selectively obtained from DMO via hydrogenation, and therefore, has the potential to serve as raw material for methyl glyoxylate. However, only few studies have considered this process. Herein , the applications, traditional preparation methods, and state-of-the-art research progress of methyl glycolate oxidation are reviewed. Recent research on selective oxidation of related alcohols (such as ethanol) to aldehydes and ketones is also summarized.

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    Progress in supported Pt-based catalysts for the liquid-phase selective hydrogenation of cinnamaldehyde
    Mengnan LI, Huiyue XIN, Peng WU, Xiaohong LI
    Journal of East China Normal University(Natural Science)    2023, 2023 (1): 114-128.   DOI: 10.3969/j.issn.1000-5641.2023.01.012
    Abstract320)   HTML13)    PDF (3712KB)(162)      

    The selective hydrogenation of cinnamaldehyde is an important model reaction for investigating the relationship between catalyst structures and regioselectivity. In recent years, researchers have designed and synthesized a series of better-performing, supported Pt-based catalysts for the selective hydrogenation of cinnamaldehyde, based on electronic, synergistic, and geometric effects to improve the selectivity. In this mini-review, we aim to summarize the recent progress in different supported Pt-based catalysts for the selective hydrogenation of cinnamaldehyde and discuss the performance of these supported catalysts to provide ideas for the design of novel better-performing Pt-based catalysts.

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