Influence of Zeolites and Mesoporous Catalysts on Catalytic Pyrolysis of Brominated Acrylonitrile–Butadiene–Styrene (Br-ABS)

Three zeolite materials (HY, Hβ, and HZSM-5) and two mesoporous solids (all-silica MCM-41 and active Al 2 O 3 ) with different textural properties were investigated for their catalytic effects on the pyrolysis of brominated acrylonitrile–butadiene–styrene (Br-ABS). The results indicated that, in the absence of a catalyst, the maximum liquid yield was obtained from the pyrolysis of Br-ABS, including oil and wax. The addition of HY and Hβ zeolites significantly decreased the oil yield from 63.6 to 45 and 44.3 wt %, respectively, with a corresponding increase in the yields of wax and gas. HZSM-5 zeolite slightly changed the product distribution and increased the gas yield at the expense of wax. Noteworthy, the mesoporous catalyst of all-silica MCM-41 retained the oil production while significantly reduced the wax yield to 7.9 wt %. In terms of the composition of the oils, the catalysts could promote the formation of valuable single-ring aromatics in oils. Moreover, the catalysts exhibited pronounced debromination efficiency, especially the zeolites, which could achieve the removal of bromine in oils by over 50% compared to thermal pyrolysis. The results indicated that the product distributions of Br-ABS had interrelationship with the textural properties of catalysts.