Abstract
We present a joint experimental and theoretical study on metal dusting phenomena in Ni binary alloys containing group-14 and 15 elements in the periodic series. Laboratory metal dusting test of several Ni binary alloys was conducted in a simulated syngas atmosphere consisting of CO, H2, CO2, and H2O at 923 K for 100 h. The Ni alloys containing the group-14 and 15 elements exhibited excellent metal dusting resistance. This behavior is reasonably interpreted by the Blyholder mechanism and the electron filling concept in the p-d hybridization states for the associated alloys. Furthermore, surface segregation of the group-14 and 15 elements was analyzed by ARXPS on the Ni alloys after exposing at 923 K in a vacuum. The behavior of those segregation was quantitatively associated with the non-dissociative adsorption.
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