(560dk) Noble Bi-Metallic (Pt-Ru) Catalyst for Diesel Autothermal Reforming – Activity Tests and Characterizations

A diesel reforming is a promising method for supplying hydrogen to mobile fuel cell systems. However, due to the diesel is a complex mixture of heavy hydrocarbons which contains long-chain of paraffins and aromatics, it is easy for the reforming catalyst to be degraded. As a result, fuel is not fully converted to hydrogen, carbon monoxide and carbon dioxide, and unwanted by-products such as ethylene are produced. Noble metals are well-known active metals due to its high activity and coke resistance. Nevertheless, it is still not verified for long-term performance for diesel reforming. In our previous study, Pt-Ru bimetallic catalyst had introduced as an autothermal reforming (ATR) catalyst and it showed great stability and coke resistance. In this study, we investigated the reasons that enhance the durability of the bi-metallic catalyst. For monometallic(Pt,Ru) and bimetallic(Pt-Ru) supported on CGO, activity tests catalyst and various characterization methods were performed. Temperature programmed reduction(TPR), CO-chemisorption, and transmission electron microscopy(TEM) were used to analyze redox property, metal dispersion and morphology of the active metal, respectively. Finally, we conducted 1,000 hour long-term test at 800oC, SCR 3.0 and OCR 0.8. All catalyst were synthesized by glycine nitrate process. As results, we found strong synergetic effects between Pt and Ru which compensated both of the low activity of Pt at low temperature and poor durability of Ru. Moreover, agglomeration effect of the active metal was reduced. This performance enhancement came from the formation of Pt-Ru clusters demonstrated by TEM images and TPR profiles. The Pt-Ru catalyst showed excellent reforming performance for 1000 hours without any degradation signals.