Desenvolvimento de catalisadores do tipo Pt/L no craqueamento catalítico e isomerização do n-octano.

Abstract

Technologically, hydrocarbons are raw materials to a large number of important products. Due to a great variety of cracking and isomerization conventions on zeolites they importance to petrochemical industry, and to optmization of the fuel. In this research, the peformance of catalyts Pt/L zeolite (0,3 % ,0,5% and 0,7% of Pt/KL) in cracking and isomerization of n-octane was studied to obtain products of high aggregate value utilizaded in petrochemical industry and in the protection of the envivonment monometallic catalysts with different contents of platinum (0,3 % ,0,5% and 0,7% of Pt) supportd on KL zeolite, through competitive ionic exchange, utilizing the complex [Pt(NH3)4]Cl2 as precursory material where prepared. After the process of competitive ionic exchange, the materials were calcinated at 500° C and reduced at the same temperature. These catalysts were characterized by the techniques: Xray spectrometry by dispersive energy (XDE); X-ray difration (XRD); thermodifferential analysis (TDA); thermogravimetric analysis (TGA) and reduction by programmed temperature (RPT) (0,3 % ,0,5% and 0,7% of Pt/KL). The profiles of reduction by programmed temperature (RPT) of catalysts displayed that the temperature of reduction of the metal depends on the localization of the same zeolite structure. By the catalytic cracking and isomerization of n-octane it was founded that the distribution of products depends on the quantity of platinum and the temperature of reation. The catalyst with low quantity of platinum (0,3%) incorporated produced isopentane and isobutane, which is useful to optimize the quality of gasoline. The other catalysts (0.5% and 7%) are useful to produce products of high aggregate value like butene and pentene.