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Efficient catalysts for simultaneous dehydration of light alcohols in gas phase

机译：有效的催化剂，用于同时在气相中同时脱水

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摘要

We report the simultaneous dehydration of light alcohols over rare earth phosphate catalysts. Catalytic reactions were carried out in a gas-phase fixed-bed reactor at temperatures ranging from 490 to 643 K. The catalyst samples were synthesized and characterized using various techniques, and their acid properties compared by monitoring the desorption of 2,6-dimethylpyridine by means of FTIR spectroscopy. The catalysts were found to be very efficient for the simultaneous dehydration of ethanol and 1-butanol to ethylene and 2-butene. This catalytic dehydration should involve the moderately strong Bronsted and Lewis acid sites revealed on the catalysts' surface, whose strength distribution was sufficiently broad to minimize the competition between dehydration of the two alcohols. The catalysts were also very efficient in the direct dehydration of alcohol mixtures produced by bacterial fermentation (PBE: propanol-1-butanol-ethanol and ABE: acetone-1-butanol-ethanol). This outcome makes it possible to consider a metathesis-based industrial process for the production of propylene, in which the first step involves the dehydration of alcohol mixtures produced by biomass degradation. These catalysts are shown to present further advantages such as their insensitivity to the addition of water in the gas feeds, relative stability with time on stream, and straightforward regeneration.
机译：我们报告了在稀土磷酸盐催化剂上同时脱水的。在490至643 K的温度下，在气相固定层反应器中进行催化反应。催化剂样品被合成并使用各种技术进行表征，并通过监测2,6-二甲基吡啶的呼吸来比较其酸性。 FTIR光谱法。发现催化剂对于乙醇和1-丁醇同时脱水至乙烯和2-丁烯非常有效。这种催化脱水应涉及催化剂表面上揭示的中等强的布朗斯特和刘易斯酸位点，其强度分布足够宽，可以最大程度地减少两种醇的脱水之间的竞争。催化剂在细菌发酵产生的酒精混合物的直接脱水方面也非常有效（PBE：丙醇-1-丁醇 - 乙醇和ABE：丙酮-1-丁醇 - 乙醇）。这种结果使考虑基于元理解的产生丙烯的工业过程，其中第一步涉及生物量降解产生的酒精混合物的脱水。这些催化剂被证明具有进一步的优势，例如它们对气体饲料中的水的不敏感性，随着溪流的时间和直接再生的相对稳定性。

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