Highly Active and Stable Pd-GaOx/Al2O3 Catalysts Derived from Intermetallic Pd5Ga3 Nanocrystals for Methane Combustion
Highly Active and Stable Pd-GaOx/Al2O3 Catalysts Derived from Intermetallic Pd5Ga3 Nanocrystals for Methane Combustion
复制标题
用于甲烷燃烧的金属间化合物 Pd5Ga3 纳米晶衍生的高活性和稳定的 Pd-GaOx/Al2O3 催化剂
DOI：
10.1002/cctc.201801684
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发表时间：
2018-12-21
期刊：
影响因子：
4.5
通讯作者：
Dai, Hongxing
中科院分区：
文献类型：
--
作者：
Hou, Zhiquan;Liu, Yuxi;Dai, Hongxing
甲烷的催化燃烧广泛应用于工业和运输活动中。然而，常用的Pd基催化剂在水热条件下容易失活。在这项工作中，我们采用了一种新的策略，通过氧化转化的金属间化合物Pd 5Ga 3纳米晶负载在γ-Al 2 O3制备的GaOx掺杂的Pd/Al 2 O3催化剂。我们通过形成双功能活性Pd-O-Ga相观察到钯和氧化镓之间的协同效应，从而产生高活性和异常稳定的催化剂，其可以显著抑制贵金属在苛刻条件下的烧结（在750摄氏度下的水热处理）。此外，大量的表面氧空位和表面Pd-O-Ga相的存在对甲烷在催化剂上的燃烧有促进作用。这种新型的双金属催化剂在甲烷燃烧反应中具有良好的应用前景。
Catalytic combustion of methane is widely used in industrial and transportation activities. The commonly used Pd-based catalysts, however, are easily deactivated under hydrothermal conditions. In this work, we adopted a novel strategy to prepare a GaOx-doped Pd/Al2O3 catalyst via the oxidative transformation of intermetallic Pd5Ga3 nanocrystals supported on gamma-Al2O3. We observed a synergistic effect between palladium and gallium oxide via formation of a bi-functional active Pd-O-Ga phase, resulting in a highly active and exceptionally stable catalyst that could markedly suppress the sintering of noble metals under harsh conditions (hydrothermal treatment at 750 degrees C). Moreover, the presence of a large amount of surface oxygen vacancies and the surface Pd-O-Ga phase could promote methane combustion over the catalysts. It is believed that such a novel dual-metal catalyst is promising in practical applications for methane combustion.