Catalytic Cracking of n-Dodecane over Alkali-Metal-Modified ZSM-5 Zeolites

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发表日期：

2024年9月1日

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A. S. Giliazutdinova,
T. P. Sorokina,
O. V. Potapenko,
V. P. Doronin,
D. N. Ogurtsova,
V. A. Koveza

摘要

Abstract

The physicochemical properties of ZSM-5 zeolite samples modified with alkali metal cations (e.g., Li⁺, Na⁺, K⁺, and Cs⁺) were characterized. It was demonstrated that increasing the metal load led to a decrease in the textural properties of the zeolite such as specific surface area, total pore volume, and micropore volume; furthermore, it reduced the total concentration of acid sites by 23–25% (at 0.72 × 10^–2 mol % potassium or 0.38 × 10^–2 mol % cesium). In the cracking of n-dodecane, the modification of ZSM-5 with 2.34 × 10^–2 mol% cesium enhanced the yield of light olefins up to 40.1 wt %, which is comparable with the value achieved by a phosphorus-based ZSM-5 sample (40.3 wt %).