Deactivation and Regeneration of Ni/ZA Catalyst in Hydrocracking of Polypropylene

Imam Khabib; Sri Kadarwati; Sri Wahyuni

doi:10.22146/ijc.21258

Deactivation and Regeneration of Ni/ZA Catalyst in Hydrocracking of Polypropylene

https://doi.org/10.22146/ijc.21258

Imam Khabib⁽¹⁾, Sri Kadarwati^(2*), Sri Wahyuni⁽³⁾

(1) Department of Chemistry, Semarang State University, Kampus Sekaran, Gunungpati, Semarang 50227
(2) Department of Chemistry, Semarang State University, Kampus Sekaran, Gunungpati, Semarang 50227
(3) Department of Chemistry, Semarang State University, Kampus Sekaran, Gunungpati, Semarang 50227
(*) Corresponding Author

Abstract

The phenomena of catalyst deactivation and the effects of regeneration method on the characteristics and activity of Ni/ZA catalyst after being used in a continuous cracking reaction of polypropylene have been studied. Ni/ZA catalyst was prepared using sonochemical method with total metal intake of 4%. Characteristics and activity of fresh, spent, and regenerated catalyst were evaluated to get a better understanding about the catalyst deactivation. Characteristics which have been observed include catalyst acidity, porosity, crystallinity, and surface morphology. Catalytic activity test of Ni/ZA catalyst on polypropylene cracking reaction at temperature of 500 °C with H₂ flow rate of 20 mL/min and catalyst:feed ratio of 1:2 (w/w) showed the decrease of some catalyst characteristics such as specific surface area, total pore volume, and acidity due to coke fouling over a five-times continuous experiment. Regeneration of catalyst with oxidation-reduction method has been able to increase the activity and acidity of catalyst up to 7.47% and 38.54%, respectively, compared to those of spent catalyst, while the catalyst surface area and total pore volume decreased up to 32.83% and 26.92%, respectively.

Keywords

deactivation; Ni/ZA; polypropylene; regeneration

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DOI: https://doi.org/10.22146/ijc.21258