Methane-Assisted Limestone Calcination

20% Lower Energy

Utilizes a methane atmosphere to convert calcium carbonate decomposition into syngas, with metal oxides tuning the reaction pathway to significantly reduce energy demand.

Hengrui, Jin · Ruimin, Tao · Haiping, Yang · Wang, Xianhua · Yang, Y. · Hao, Jiang · Chen, Yingquan

Carbon Capture Science and Technology 2026

Specifications

Apparent activation energy reduction

{'zh': '20', 'en': '20'} %

Apparent heat effect reduction

{'zh': '20–50', 'en': '20–50'} kJ/mol

Reaction temperature reduction

{'zh': '110', 'en': '110'} °C

Apparent heat effect

{'zh': '70–80', 'en': '70–80'} kJ/mol

Advantages

Lower energy demand

Under methane, the coupled reaction lowers the apparent heat effect by 20–50 kJ/mol and the apparent activation energy by about 20%.

Notably lower temperature

Ni- or Co-supported ZSM-5 catalysts reduce the reaction temperature by approximately 110 °C, benefiting process energy savings.

Syngas instead of CO2

Methane promotes the conversion of CO2 to CO, turning the off-gas from pure CO2 into syngas components, enhancing process value.

Applications

• Limestone Calcination：Introducing methane into existing kilns reduces calcination temperature and energy use without equipment modification.
• Low-Carbon Cement：Reduces limestone decomposition energy and direct CO2 emissions, helping low-carbon cement production.
• CO2 Utilization：Converts released CO2 into CO as a syngas component in situ, enabling carbon utilization.
• Metal Oxide Catalysts：Different metal oxide catalysts can tailor reaction temperature or heat effect to meet process requirements.