Oxidative coupling of methanol and ethanol is becoming a promising alternative to produce sustainable acrolein. In this work, the reaction has been performed in two successive reactors (for oxidation and aldolization respectively) in order to study the role of the acid/base properties of spinel catalysts with various Al/Mg ratios. The acid/base properties of catalysts were investigated by NH₃ and SO₂ adsorption microcalorimetry. To deeply investigate the adsorption mechanism of the reactants on the catalysts, other adsorption microcalorimetry studies coupled to FTIR were performed using methanol, formaldehyde, acetaldehyde and propionaldehyde. Catalytic results were correlated to FTIR spectra and revealed the disproportionation of formaldehyde. Co-adsorption of aldehydes was also investigated by FTIR showing a preferential adsorption of formaldehyde compared to acetaldehyde. The different species resulting from aldehyde adsorption are discussed.

中文翻译：

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在尖晶石催化剂上通过醇的氧化偶合合成丙烯醛：微量量热法和光谱法

甲醇和乙醇的氧化偶联正成为生产可持续丙烯醛的有前途的替代方法。在这项工作中，该反应已在两个连续的反应器中进行（分别用于氧化和醛醇缩合反应），以研究各种Al / Mg比的尖晶石催化剂的酸/碱性质的作用。通过NH ₃和SO ₂研究了催化剂的酸/碱性质吸附量热法。为了深入研究反应物在催化剂上的吸附机理，使用甲醇，甲醛，乙醛和丙醛进行了其他与FTIR结合的吸附量热法研究。催化结果与FTIR光谱相关，并揭示了甲醛的歧化。FTIR还研究了醛的共吸附，与乙醛相比，甲醛的优先吸附。讨论了由醛吸附引起的不同物质。