A numerical study for gas–solid reactions in a microwave-based system: kinetic and environmental aspects

Document Type : Research Paper

Authors

Faculty of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan, Iran

Abstract

Due to environmental concerns and requirements, modern heating methods are highly recommended. The microwave-based system has attracted great attention due to its efficiency, low carbon footprint, low energy consumption, and short process timing. Our studies on microwave heating for synthesizing cobalt and various alloys indicated a significant need for novel predictors in modeling microwave heating processes. The novelty of this paper was to evaluate the performance of outstanding numerical methods for solving microwave-based reactions in the case of kinetic and environmental aspects. As a case study, the experimental results related to the reaction of cobalt metal oxide with syngas under microwave heating were compared to the orthogonal collocation outcomes, and outstanding results were reported with a mean error lower than 5%. Then, the emissions of microwave and an electrical furnace based on the kinetics values were compared. In addition, to evaluate the numerical methods for different types of reactions in the mentioned microwave heating process, the governing equations from the modeling of gas-solid catalyzed reactions with different reaction orders were solved by the perturbation and the orthogonal collocation methods. From the environmental analysis, it was demonstrated that the microwave process offered notable environmental and operational advantages over the furnace process, including significantly faster CO removal, more controllable CO₂ emissions, higher energy efficiency, and reduced overall carbon footprint by possibly reducing energy consumption.

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Articles in Press, Accepted Manuscript
Available Online from 13 May 2026
  • Receive Date: 29 October 2025
  • Revise Date: 12 May 2026
  • Accept Date: 13 May 2026