fig6

Figure 6. (A) The percentage of Zn species over different Zn/ZSM-5 catalysts obtained by deconvolution of XPS; (B) Proposed pathway of HDPE cracking and aromatization over Zn/ZSM-5; (C) The relationship between Zn species ([ZnOH]⁺ and bridged Zn²⁺) and the yields of (a) BTX and (b) Other MAHs. These figures are quoted with permission from Qian et al.^[82]; (D) Schematic diagram of reaction flow over s-ZSM-5 and Zn/meso-ZSM-5. This figure is quoted with permission from Duan et al.^[83]; (E) Schematic illustration of the cascade cracking steps on the external zeolite surface and within zeolite micropores on n-ZSM-5 and s-ZSM-5 catalysts. This figure is quoted with permission from Duan et al.^[31]; (F) Conversion of propylene and selectivity of different products over different catalysts. This figure is quoted with permission from Duan et al.^[83]. XPS: X-ray photoelectron; HDPE: high-density polyethylene; BTX: benzene, toluene and xylene; MAHs: monoaromatic hydrocarbons.