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Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene

機(jī)譯：系統(tǒng)研究α-MoO3形態(tài)對(duì)丙烯選擇性氧化的影響

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摘要

A variety of morphologically different α-MoO3 samples were prepared by hydrothermal synthesis and applied in the selective oxidation of propylene. Their catalytic performance was compared to α-MoO3 prepared by flame spray pyrolysis (FSP) and a classical synthesis route. Hydrothermal synthesis from ammonium heptamolybdate (AHM) and nitric acid at pH 1–2 led to ammonium containing molybdenum oxide phases that were completely transformed into α-MoO3 after calcination at 550 °C. A one-step synthesis of α-MoO3 rods was possible starting from MoO3·2H2O with acetic acid or nitric acid and from AHM with nitric acid at 180 °C. Particularly, if nitric acid was used during synthesis, the rod-like morphology of the samples could be stabilized during calcination at 550 °C and the following catalytic activity tests, which was beneficial for the catalytic performance in propylene oxidation. Characterization studies using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy showed that those samples, which retained their rod-like morphology during the activity tests, yielded the highest propylene conversion.
機(jī)譯：通過(guò)水熱合成制備了各種形態(tài)不同的α-MoO3樣品，并將其用于丙烯的選擇性氧化。將它們的催化性能與通過(guò)火焰噴霧熱解（FSP）和經(jīng)典合成路線制備的α-MoO3進(jìn)行了比較。在pH值為1-2的條件下，由七鉬酸銨（AHM）和硝酸進(jìn)行水熱合成可生成含銨的氧化鉬相，并在550°C的煅燒后將其完全轉(zhuǎn)化為α-MoO3。從MoO3·2H2O與乙酸或硝酸開(kāi)始，從AHM與硝酸在180°C開(kāi)始，可以一步合成α-MoO3棒。特別地，如果在合成過(guò)程中使用硝酸，則樣品的棒狀形態(tài)可以在550℃下煅燒和隨后的催化活性測(cè)試期間穩(wěn)定，這有利于丙烯氧化的催化性能。使用X射線衍射（XRD），掃描電子顯微鏡（SEM）和拉曼光譜進(jìn)行的表征研究表明，那些在活性測(cè)試過(guò)程中保持棒狀形態(tài)的樣品產(chǎn)生了最高的丙烯轉(zhuǎn)化率。

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