Gas-phase synthesis of oxymethylene ethers over Si-rich zeolites,Green Chemistry

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Gas-phase synthesis of oxymethylene ethers over Si-rich zeolites
Green Chemistry ( IF 9.3 ) Pub Date : 2018-09-27 , DOI: 10.1039/c8gc02617c
Anna Grünert _{1,

2,

3} , Pit Losch _{1,

2,

3} , Cristina Ochoa-Hernández _{1,

2,

3} , Wolfgang Schmidt _{1,

2,

3} , Ferdi Schüth _{1,

2,

3}

Affiliation

Oxymethylene ethers are a class of synthetic fuels that allows significantly reduced levels of pollutant emissions from compression-ignition engines. Conventionally they are synthesized in liquid-phase. As a new approach for the production of oxymethylene ethers the continuous gas-phase synthesis from methanol and formaldehyde was studied. A broad range of zeolites has been studied as the catalysts for the reaction and a relationship between reactivity and silica-to-alumina ratio was established. Moderate acidity as found in silicon-rich zeolites proved to be advantageous. Even aluminum-free zeolite shows high selectivity and activity to OME indicating that silanol groups as found on the external surface or in defects provide sufficient acidity for the reaction. The zeolitic catalysts deactivate with time but can be fully regenerated with common regeneration protocols.

中文翻译：

富硅沸石上气相合成甲醛醚

甲醛醚是一类合成燃料，可显着降低压燃式发动机的污染物排放水平。通常，它们是液相合成的。作为一种生产甲醛醚的新方法，研究了由甲醇和甲醛进行连续气相合成的方法。已经研究了广泛的沸石作为该反应的催化剂，并且建立了反应性与二氧化硅/氧化铝比之间的关系。在富硅沸石中发现适度的酸度是有利的。甚至不含铝的沸石也显示出对OME的高选择性和活性，这表明在外表面或缺陷中发现的硅烷醇基团为反应提供了足够的酸度。

更新日期：2018-10-15

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