Sinterización de catalizadores monometálicos y bimetálicos en alúmina para su aplicación en pirólisis de plásticos

Abstract

In the present research, modified catalysts, with the incorporation of the metals nickel and zinc, were synthesized from hexahydrate salts of Ni(NO3)2 Ni ( NO 3 ) 2

and Zn(NO3)2

Zn ( NO 3 ) 2

. The Ni impregnation method synthesized the monometallic and bimetallic catalyst by Ni-Zn co-impregnation. The catalytic support was γ-alumina with an aluminum-oxygen composition and an amorphous crystal structure. To synthesize the monometallic catalyst (Ni/Al2O3), the support was first calcined, and then the γ-alumina calcined with NH4NO3 was added in a rotary vapor for one hour. Ni(NO3)2 Ni ( NO 3 ) 2

was added to the product obtained to impregnate the Ni, a process carried out in the same rotary steamer. On the other hand, for the bimetallic catalyst (Ni-Zn/Al2O3), the process was the same, with the difference that a co-impregnation was performed by first adding the Ni(NO3)2 Ni ( NO 3 ) 2

solution to the rotary vapor for one hour. Subsequently, Zn(NO3)2 Zn ( NO 3 ) 2

solution is added to impregnate the Zn. The solids resulting from both processes were vacuum filtered, allowed to dry, and calcined. Finally, the product obtained was characterized by the techniques FTIR, BET, SEM, TGA, TPR, and TPD, which were used to analyze the physicochemical properties of the synthesized catalysts, thus determining their efficiency. The analysis of the characterizations concluded that better results were obtained with the monometallic catalyst. However, both monometallic and bimetallic catalysts are efficient in catalytic activity.