High Temperature Pyrolysis of Municipal Plastic Waste Using Me/Ni/ZSM-5 Catalysts: The Effect of Metal/Nickel Ratio

Abstract

This work is dedicated to the high temperature pyrolysis of municipal plastic waste using Me/Ni/ZSM-5 catalysts. Catalysts were synthetized by wet impregnation. In addition to nickel, synthetic zeolite catalysts contain calcium, ceria, lanthanum, magnesia or manganese. Catalysts were prepared and tested using 0.1, 0.5 and 2.0 Me/Ni ratios. Catalyst morphology was investigated by SEM and surface analysis. Higher concentrations of second metals can block catalyst pore channels due to the more coke formation, which leads to smaller surface area. Furthermore, the chemicals used for the impregnation were among the catalyst grains, especially in case of 2.0 Me/Ni ratios. For pyrolysis, a horizontal tubular furnace reactor was used at 700 °C. The highest hydrogen and syngas yields were observed using ceria- and lanthanum-covered catalysts. The maximum production of syngas and hydrogen (69.8 and 49.2 mmol/g raw material) was found in the presence of Ce/Ni/ZSM-5 catalyst with a 0.5 Me/Ni ratio.

Thermo‐catalytic pyrolysis of wastes using bimetal‐modified ZSM ‐5 catalyst: investigation of the reaction kinetic parameters

“…The procedure for the preparation of bimetalloaded catalysts and their main properties are summarised in earlier publication. 49 The Ni ). 49 The main properties of the Me/Ni/ZSM-5 catalysts are summarised in Table 3.…”

“…In our earlier studies, significant effect of these catalysts on the waste polymer pyrolysis has been reported. 48,49 At first, the synthetic ZSM-5 catalyst supporter had been impregnated by nickel, then the Ni/ZSM-5 catalyst was further loaded by different elements (Ca, Ce, La, Mg, Mn). The procedure for the preparation of bimetalloaded catalysts and their main properties are summarised in earlier publication.…”

“…49 The main properties of the Me/Ni/ZSM-5 catalysts are summarised in Table 3. 49 The Ni/ZSM-5 catalyst had BJH surface area of 119 m 2 /g, BET surface area of 482 m 2 /g, Si/Al ratio of 33 and nickel content of 4.11%. The results of catalyst analysis clearly show that Ni/ZSM-5 catalyst had the highest specific surfaces, because the second metal on the surface of the catalyst can visibly reduce the specific surfaces in each case.…”

“…The value of S BJH was the lowest for the magnesium-modified catalyst, while the highest in case of calcium-modified bimetallic catalyst. 49 In terms of metal content, it can be said that the amount of nickel (3.73%-4.02%) was about twice than the amount of the other metals (1.92%-2.03%). 49 2.3 | Procedure…”

“…49 In terms of metal content, it can be said that the amount of nickel (3.73%-4.02%) was about twice than the amount of the other metals (1.92%-2.03%). 49 2.3 | Procedure…”