二氧化钛包覆二氧化硅担载镍催化剂用于二氧化碳甲烷化

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中图分类号：TQ032.4

Abstract：Titanium dioxide （ TiO2 ）has low specific surface area as a CO2 methanation catalyst support，which affects the dispersion of active components. TiO 2 was uniformly coated on the surface of silica （ SiO2 ） particles using an alcohol dispersion hydrolysis method.Nickel （Ni）was loaded onto the synthesized TiO 2 -Si0 2 support with a high specific surface area using a complexation impregnation method that resulted in the Ni/TiO 2 -SiO catalyst. Effects of Ni loading and calcination temperature on the catalytic performance and microstructure were examined.The study reveals that Ni does not easily sinter during the reduction process due to the large specific surface area of the support，higher dispersion of Ni，and metal-support interaction that immobilizes theactive components.The resulting 12% Ni/TiO 2 -Si0 2 catalyst exhibits excellent activity，selectivity，and stability. Experimental results indicate that CO2 conversion rate increases linearly withthe surface area of Ni，which indicates that Ni dispersion is thedecisive factor for activity.

Key words：carbon dioxide；methanation；nickel-based catalyst；nickel loading；calcination temperature; high dispersion

1前言

化石能源消耗导致的 CO2 温室气体排放会带来环境问题;风能、太阳能等可再生能源具有波动性，储能技术尚待完善，而 H2 和 CO2 反应可以生成碳氢化合物，在储能的同时实现 CO2 减排，成为当前重要的发展方向。（剩余15904字）