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The effect of MgO and preparation techniques of the FeMnOδ/MgO–Al2O3 catalyst used for the vapor phase oxidation of cyclohexane
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2022-07-16 , DOI: 10.1039/d2re00210h Vijendra Kumar Yadav 1 , Taraknath Das 1
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2022-07-16 , DOI: 10.1039/d2re00210h Vijendra Kumar Yadav 1 , Taraknath Das 1
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Magnesia modified alumina with varying contents of MgO was synthesized by the impregnation technique and used as support for the synthesis of supported iron–manganese oxide catalysts. The effect of synthesis techniques such as incipient wetness impregnation, wet impregnation, and sequential impregnation of iron and manganese over the modified supports was investigated in the vapor phase selective oxidation of cyclohexane. The addition of MgO resulted in MgAl2O4 spinel formation, which altered the acidic–basic properties and modified the interaction of Fe–Mn metal oxides with alumina. The iron oxides and manganese oxides were highly dispersed in the catalysts synthesized by the sequential impregnation (SI-I) method, whereas the iron oxide forms a highly crystalline α-Fe2O3 phase when prepared by the SI-II method. The catalyst prepared by the SI-I method (Mn addition followed by Fe) exhibited the highest activity and yield of KA oil and remained stable for more than 10 h. The formation of adsorbed cyclohexanolate (and phenolate) species was observed as intermediate species during the in situ DRIFTS studies for the reaction. Also, the catalytic performance was analysed by varying the catalyst weight. The increasing weight of the catalyst in the reactor affected the percent conversion of cyclohexane and the product distribution significantly.
中文翻译：
MgO对环己烷气相氧化的影响及FeMnOδ/MgO-Al2O3催化剂的制备工艺
通过浸渍技术合成了具有不同 MgO 含量的氧化镁改性氧化铝，并用作合成负载型铁锰氧化物催化剂的载体。在环己烷的气相选择性氧化中，研究了在改性载体上的初湿浸渍、湿浸渍和顺序浸渍铁和锰等合成技术的影响。添加 MgO 导致 MgAl 2 O 4尖晶石的形成，这改变了酸碱性质并改变了 Fe-Mn 金属氧化物与氧化铝的相互作用。氧化铁和氧化锰高度分散在通过顺序浸渍（SI-I）法合成的催化剂中，而氧化铁形成高度结晶的α-Fe 2用SI-II法制备的O 3相。采用 SI-I 法（先加锰，后加铁）制备的催化剂在 KA 油中表现出最高的活性和收率，并在 10 小时以上保持稳定。在反应的原位DRIFTS 研究期间，观察到吸附的环己醇盐（和酚盐）物质的形成作为中间物质。此外，通过改变催化剂重量来分析催化性能。反应器中催化剂重量的增加显着影响环己烷的转化率和产物分布。
更新日期：2022-07-16
中文翻译：
MgO对环己烷气相氧化的影响及FeMnOδ/MgO-Al2O3催化剂的制备工艺
通过浸渍技术合成了具有不同 MgO 含量的氧化镁改性氧化铝，并用作合成负载型铁锰氧化物催化剂的载体。在环己烷的气相选择性氧化中，研究了在改性载体上的初湿浸渍、湿浸渍和顺序浸渍铁和锰等合成技术的影响。添加 MgO 导致 MgAl 2 O 4尖晶石的形成，这改变了酸碱性质并改变了 Fe-Mn 金属氧化物与氧化铝的相互作用。氧化铁和氧化锰高度分散在通过顺序浸渍（SI-I）法合成的催化剂中，而氧化铁形成高度结晶的α-Fe 2用SI-II法制备的O 3相。采用 SI-I 法（先加锰，后加铁）制备的催化剂在 KA 油中表现出最高的活性和收率，并在 10 小时以上保持稳定。在反应的原位DRIFTS 研究期间，观察到吸附的环己醇盐（和酚盐）物质的形成作为中间物质。此外，通过改变催化剂重量来分析催化性能。反应器中催化剂重量的增加显着影响环己烷的转化率和产物分布。
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