Modeling the effects of temperature and time of homogenization annealing on the hardness of PdNi5 alloy

Abstract

Experimental design methodology represents a powerful tool for the analysis and optimization of various processes. PdNi5 alloy is used in the in the production process of nitric acid, as Pd-catalyst-trap. The role of Pd-catalyst-trap consists in reduction of volatile platinum oxide from gas flow to the metal form and retention of platinum metal on the surface of Pd catalyst-trap. Fundamental knowledge about this alloy and its practical use in reduction of volatile platinum oxide, can be improved by experimental planning and statistical analysis. In this study, the effects of annealed temperature and annealed time on the hardness of PdNi5 alloy were evaluated and compared. Full factorial experimental design at three levels was applied. Statistically significant factors were determined considering of hardness of PdNi5 alloy as a system response. By regression analysis, the mathematical model for process description was derived. The correlation between predicted and experimental values was high (R2=0,976 ). In the investigated ranges of parameters, the obtained empirical equation can be applied for the prediction of system response. [Projekat Ministarstva nauke Republike Srbije, br TR 34029: Razvoj tehnologije proizvodnje Pd katalizatora-hvatača za smanjenje gubitaka platine u visokotemperaturnim procesima katalize]

Keywords

• PdNi5
• experimental design
• Pd-catalyst-trap