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首页> 外文期刊>Catalysis science & technology >The stability and deactivation of Pd-Cu-Cl_x/Al2O3 catalyst for low temperature CO oxidation: an effect of moisture
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The stability and deactivation of Pd-Cu-Cl_x/Al2O3 catalyst for low temperature CO oxidation: an effect of moisture

机译：低温CO氧化的PD-CU-CL_X/AL2O3催化剂的稳定性和失活：水分的影响

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摘要

The catalytic stability of a Pd-Cu-Cl_x/Al2O3 catalyst for low temperature CO oxidation was investigated in different conditions. Under ~0.1% moisture, the CO conversion over the Pd-Cu-Cl_x/Al2O3 catalyst can be maintained at 100% for 30 h even at 0 °C, but it deactivated reversibly at 25 °C with ~0.6% moisture and irreversibly deactivated at 25 °C with ~3.1% moisture or 0 °C with ~ 0.6% moisture. The reversible deactivation is resulted from physical capillary condensation in the small pores of the catalysts. The irreversible deactivation is due to a breakage of the close-knit structure of Pd-Cu-Cl leading to an aggregation or transformation of the active copper phase, and the formation of a carbonate species on the catalyst surface, meaning that the inactive Pd° species over the surface of the Pd-Cu-Cl_x/Al2O3 catalyst is hard to re-oxidize back to the active Pd~+ sites by copper species in the high moisture reaction conditions.
机译：在不同条件下研究了低温CO氧化的PD-CU-CL_X/AL2O3催化剂的催化稳定性。 低于0.1％的水分，PD-CU-CL_X/AL2O3催化剂上的CO转换即使在0°C下也可以保持100％，但在25°C下以〜0.6％的湿度和不可逆地停用了25°C，可逆地将其停用 在25°C下，水分或0°C，水分为0°C。 可逆失活是由催化剂小孔中的物理毛细管凝结产生的。 不可逆转的失活是由于PD-CU-CL的紧密连接结构的断裂，导致活性铜相的聚集或转化，以及在催化剂表面上形成碳酸盐物种，这意味着无活性的PD° PD-CU-CL_X/AL2O3催化剂的表面上的物种很难通过高水分反应条件下的铜物种重新氧化回活的Pd〜+位点。

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