Catalytic pyrolysis of waste tire over HMOR-based catalysts : industrialized Ru/HMOR-based catalyst

Abstract

The catalytic pyrolysis of waste tire has been studied in this research. The goal w as to develop the Ru-supported HMOR catalyst as an industrial catalyst for the production of light olefins (ethylene and propylene) in the gaseous product from the catalytic pyrolysis of waste tires. The catalysts consist of the Ru/HM R zeolite (active), a clay (matrix), and an a-alumina (binder). The optimum composition of the Ru/HMOR -based catalyst was determined, and the effect of ratio of pellet diameter to reactor diameter, and the deactivation of the catalyst by coking were investigated for their influences on the quality and quantity of pyrolysis products, especially the light olefins in the gaseous product. As a result, the optimum composition of the catalyst for light olefins and naphtha production was 20 % wt of Ru/HMOR , 70 % wt of kaolin, and 10 % wt of a-alumina. The matrix was found to help the heat dissipation during reaction. The influence of pellet diameter was on the diffusion limitation in the solid catalyst. The best ratio of pellet to reactor diameter for the maximum light olefins production was 0.0556 (3.0 mm of pellet diameter) for the bench –scale autoclave reactor. In addition, the deactivation of the catalyst was caused by the coke formation, the sulphur deposition, and the metal agglomeration.