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Modification of a phase-inhomogeneous alumina support of a palladium catalyst. Part II: the effect of palladium dispersion on the formation of hydride forms, electronic state, and catalytic performance in the reaction of partial hydrogenation of unsaturated hydrocarbons
Materials Today Chemistry ( IF 7.3 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.mtchem.2020.100387 A. Boretskaya , I. Il'yasov , A. Popov , A. Lamberov
Materials Today Chemistry ( IF 7.3 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.mtchem.2020.100387 A. Boretskaya , I. Il'yasov , A. Popov , A. Lamberov
Abstract It was shown for the first time that amorphous phase in an alumina support promotes the formation of palladium particles in a wide size range. This catalyst has a low selectivity to butenes in the 1,3-butadiene hydrogenation. It was suggested that surface palladium aluminates contribute to an increase in butene selectivity up to 99.5% at a hydrogenation temperature of not more than 65 °C. At higher reaction temperatures, the catalyst based on phase-homogeneous γ-Al2O3 has the highest activity and butene selectivity. This catalyst was obtained by the traditional impregnation method and contains highly dispersed palladium particles with a sufficiently high electron density. It was shown that the formation of hydride forms on palladium particles with a size of less than 1 nm was detected by temperature-programmed reduction with hydrogen.
中文翻译:
钯催化剂的相不均匀氧化铝载体的改性。第二部分:钯分散对不饱和烃部分加氢反应中氢化物形成、电子态和催化性能的影响
摘要 首次表明氧化铝载体中的无定形相促进了大尺寸范围的钯颗粒的形成。该催化剂在 1,3-丁二烯加氢中对丁烯的选择性较低。有人提出,在不超过 65°C 的氢化温度下,表面铝酸钯有助于将丁烯选择性提高至 99.5%。在较高的反应温度下,基于相均相 γ-Al2O3 的催化剂具有最高的活性和丁烯选择性。这种催化剂是通过传统的浸渍方法获得的,含有高度分散的具有足够高电子密度的钯颗粒。结果表明,通过用氢气进行程序升温还原,可以检测到在尺寸小于 1 nm 的钯颗粒上形成氢化物。
更新日期:2021-03-01
中文翻译:
钯催化剂的相不均匀氧化铝载体的改性。第二部分:钯分散对不饱和烃部分加氢反应中氢化物形成、电子态和催化性能的影响
摘要 首次表明氧化铝载体中的无定形相促进了大尺寸范围的钯颗粒的形成。该催化剂在 1,3-丁二烯加氢中对丁烯的选择性较低。有人提出,在不超过 65°C 的氢化温度下,表面铝酸钯有助于将丁烯选择性提高至 99.5%。在较高的反应温度下,基于相均相 γ-Al2O3 的催化剂具有最高的活性和丁烯选择性。这种催化剂是通过传统的浸渍方法获得的,含有高度分散的具有足够高电子密度的钯颗粒。结果表明,通过用氢气进行程序升温还原,可以检测到在尺寸小于 1 nm 的钯颗粒上形成氢化物。