Effect of phosphorus and transition metal-modified ZSM-5 on the catalytic pyrolysis performance of C7 hydrocarbons with different structures

Key Points

• High L acid/B acid ratios lead to decreased conversion rates due to coke formation, while balanced ratios enhance ethylene and propylene yields.
• The study reveals that converting n-heptane, 3-methylhexane, and methylcyclohexane varies, with n-heptane showing the highest conversion efficiency.
• Characterization techniques such as X-ray diffraction and nitrogen adsorption provided insights into the physical and chemical properties of modified ZSM-5.
• Catalysts require optimal ratios of acidic sites and specific surface areas to improve effectiveness for C7 hydrocarbon conversion.