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Infrared and x-ray photoelectron spectroscopy study of chloride effect in palladium catalysts.

机译:钯催化剂中氯化物作用的红外和X射线光电子能谱研究。

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摘要

INFRARED AND X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF CHLORIDE EFFECT IN PALLADIUM CATALYSTS. Chloride poisoning is known as having an inhibitor effect in the activity of metal catalysis. In this work in situ infrared spectroscopy (FTIR) of adsorbed carbon monoxide and x-ray photoelectron spectroscopy (XPS) were used to investigate the effect of chloride presence in the electronic metal density in the d subshell of palladium dispersed on alumina. The chloride poisoning effect was interpreted as an electronic effect since a weak back-bunded Pd-CO was formed due to the decrease in the electronic density of the d subshell of palladium, which could be also detected by the higher Pd 3d(5/2) binding energy in the chloride presence. A similar poisoning effect was also observed for chloride free Pd/Al2O3 reduced at 500 degreesC, and it was interpreted based on the interaction of metal with the alumina surface. The use of molybdena/alumina binary system as support, yield a contrary effect due to the metal-support interaction.
机译:钯催化剂中氯化物作用的红外和X射线光电子能谱研究。已知氯化物中毒在金属催化活性中具有抑制剂作用。在这项工作中,吸附一氧化碳的原位红外光谱(FTIR)和X射线光电子能谱(XPS)用于研究分散在氧化铝上的钯d子壳中氯化物的存在对电子金属密度的影响。氯化物中毒效应被解释为电子效应,因为钯的d子壳的电子密度降低而形成了弱的后结合Pd-CO,这也可以通过较高的Pd 3d(5/2)来检测。 )在氯化物存在下的结合能。对于在500℃还原的无氯化物的Pd / Al2O3,也观察到了类似的中毒作用,这是根据金属与氧化铝表面的相互作用来解释的。由于金属-载体相互作用,使用钼/氧化铝二元体系作为载体产生相反的作用。

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