TiO2 promoted alcohol dehydrations on the Wells-Dawson type heteropolyacids

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Applied Catalysis A: General Pub Date : 2024-09-12 DOI:10.1016/j.apcata.2024.119947

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Abstract

The catalytic dehydrations of methanol and n-butanol on strongly acidic solids have been tested in two types of microreactors in the gas phase between 80 – 240 ºC. For the methanol transformation to dimethyl ether, the conversion was evaluated in situ with an innovative use of the FTIR spectroscopy in batch microreactor. The same catalysts were used for the conversion of n-butanol to butenes and n-butyl-ether under similar conditions, determined using a flow microreactor with the conventional gas chromatography downstream analysis. The catalysts included the Wells-Dawson type heteropolyacids, H₆P₂W₁₈O₆₂ and H₆P₂Mo₁₈O₆₂, supported on TiO₂ and/or BN. The activity orders obtained in those methods were compared to that obtained by the ammonia sorption using the gas-flow through microcalorimeter at 150 ºC. The significant effect of TiO₂ and BN supports in the methanol and butanol dehydrations makes the TiO₂ and BN-supported Well-Dawson type heteropolyacids potentially relevant for industrial transformations of biomass derived feedstock.

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二氧化钛促进威尔斯-道森型杂多酸的醇脱水作用

在 80 - 240 ºC 的气相条件下，在两种类型的微反应器中对甲醇和正丁醇在强酸性固体上的催化脱水进行了测试。在甲醇转化为二甲醚的过程中，创新性地使用了批量微反应器中的傅立叶变换红外光谱，对转化率进行了现场评估。在类似的条件下，使用相同的催化剂将正丁醇转化为丁烯和正丁醚，并使用流动微反应器和传统的气相色谱法进行下游分析。这些催化剂包括以 TiO2 和/或 BN 为载体的 Wells-Dawson 型杂多酸 H6P2W18O62 和 H6P2Mo18O62。将这些方法得到的活性顺序与在 150 ºC 下使用气流通过微量热仪进行氨吸附得到的活性顺序进行了比较。二氧化钛和 BN 支持物在甲醇和丁醇脱水中的显著效果使二氧化钛和 BN 支持的 Well-Dawson 型杂多酸有可能用于生物质衍生原料的工业转化。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.