Van't Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090GD, Amsterdam, The Netherlands.
Tata Steel, R&D, Ijmuiden, The Netherlands.
Angew Chem Int Ed Engl. 2018 Feb 5;57(6):1485-1490. doi: 10.1002/anie.201702196. Epub 2018 Jan 9.
Dehydrogenation or oxidative dehydrogenation (ODH) of alkanes to produce alkenes directly from natural gas/shale gas is gaining in importance. Ti AlC , a MAX phase, which hitherto had not been used in catalysis, efficiently catalyzes the ODH of n-butane to butenes and butadiene, which are important intermediates for the synthesis of polymers and other compounds. The catalyst, which combines both metallic and ceramic properties, is stable for at least 30 h on stream, even at low O :butane ratios, without suffering from coking. This material has neither lattice oxygens nor noble metals, yet a unique combination of numerous defects and a thin surface Ti Al O layer that is rich in oxygen vacancies makes it an active catalyst. Given the large number of compositions available, MAX phases may find applications in several heterogeneously catalyzed reactions.
烷烃的脱氢或氧化脱氢（ODH）将天然气/页岩气直接转化为烯烃的方法正变得越来越重要。TiAlC 是一种 MAX 相，迄今为止尚未在催化中使用，但它可以高效地催化正丁烷的 ODH 反应，生成丁烯和丁二烯，这是合成聚合物和其他化合物的重要中间体。这种催化剂结合了金属和陶瓷的特性，在至少 30 小时的连续运行中保持稳定，即使在低 O：正丁烷比下也不会发生结焦。该材料既没有晶格氧也没有贵金属，但由于存在大量缺陷和富含氧空位的薄表面 TiAlO 层，它具有独特的组合，使其成为一种活性催化剂。鉴于存在大量的组成，MAX 相可能会在几种多相催化反应中得到应用。
