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首页> 外文期刊>Journal of Oleo Science >Effect of Calcination Temperature on Mg-AI Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde
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Effect of Calcination Temperature on Mg-AI Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde

机译：煅烧温度对Mg-Al层状双氢氧化物（LDH）作为乙醇氧化脱氢制乙醛中有希望的催化剂的影响

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摘要

Oxidative dehydrogenation of ethanol to acetaldehyde over Mg-Al layered double hydroxides (LDH) and their differently calcined derivative catalysts was investigated in this study.The Mg-AI catalysts were synthesized via co-precipitation method and calcined at different temperatures at 450℃, 600℃ and 900℃.It revealed that the calcination temperature affected the physicochemical properties and the catalytic activity of these catalysts toward the oxidative dehydrogenation of ethanol.It was found that ethanol conversion increased with increasing reaction temperature from 200 to 400C, whereas acetaldehyde selectivity decreased.At low reaction temperature (200-300℃), the non-calcined catalyst (Mg-Al-000) showed the highest ethanol conversion, which can be attributed to the hydroxyl groups on surface having acetaldehyde as a major product.The calcination process led to formation of mixed oxide phase in Mg-AI catalysts as proven by the XRD and FT-IR results.The catalyst calcined at 450℃ (Mg-Al-450) exhibited the highest basicity as measured by the CO_2-TPD with ethanol conversion of 45.8% and acetaldehyde yield of 29.7% at 350℃.
机译：研究了Mg-Al层状双氢氧化物（LDH）及其煅烧衍生物催化剂上乙醇氧化脱氢为乙醛的过程。采用共沉淀法合成了Mg-Al催化剂，并在450℃，600℃不同温度下煅烧。焙烧温度影响了这些催化剂的理化性质和对乙醇氧化脱氢的催化活性，发现乙醇转化率随反应温度从200℃升高到400℃而增加，而乙醛的选择性下降。在低反应温度（200-300℃）下，未煅烧的催化剂（Mg-Al-000）显示出最高的乙醇转化率，这可归因于以乙醛为主要产物的表面羟基。 XRD和FT-IR结果证明了Mg-Al催化剂中混合氧化物相的形成。该催化剂在450℃（Mg-Al用CO_2-TPD测得的碱性最高（-450），在350℃下乙醇转化率为45.8％，乙醛产率为29.7％。

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  • 来源
    《Journal of Oleo Science》 |2019年第1期|95-102|共8页
  • 作者

    Piriya Pinthong; Piyasan Praserthdam; Bunjerd Jongsomjit;

  • 作者单位

    Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, THAILAND;

    Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, THAILAND;

    Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, THAILAND;

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  • 正文语种 eng
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  • 关键词

    Mg/Al hydrotalcite; ethanol; catalyst; oxidative dehydrogenation; acetaldehyde;

    机译：镁铝水滑石;乙醇催化剂;氧化脱氢乙醛;

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