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Pt/Al_2O_3催化剂的CO吸附TPD谱显示,CO的低温脱附峰(200℃前)受预吸附氢和后吸附氢的影响很大,呈现室温氢助CO吸附效应(RTHAA).而200℃以上的CO脱附谱基本上不受氢的影响.已知在聚集态Pt(如Pt丝)上的CO吸附不受氢的影响.因此可以认为,TPD谱中的高温CO脱附峰表征CO在聚集态Pt上的吸附;而受氢影响的CO低温脱附峰则表征CO在分散相Pt上的吸附.这是因为分散相Pt和Al_2O_3接触紧
The CO adsorption TPD spectra of Pt / Al 2 O 3 catalyst showed that the low temperature desorption peak (before 200 ℃) of CO was greatly affected by pre-adsorption of hydrogen and post adsorption of hydrogen, which showed RTHAA adsorption at room temperature. Of the CO desorption spectrum is substantially unaffected by hydrogen It is known that CO adsorption on aggregated Pt such as Pt wire is known to be unaffected by hydrogen It is therefore believed that the high temperature CO desorption peak in the TPD spectrum characterizes CO in The adsorption of CO on the dispersed phase Pt is characterized by the CO desorption peak under the influence of hydrogen, which is because the dispersed phase Pt and Al 2 O 3 are in tight contact