Methanol Production: A Comprehensive Review of Processes, Catalysts, and Reactors

Methanol is emerging as a highly versatile energy carrier, presenting a wide range of applications in transportation and industrial processes, offering viable alternatives to hydrogen-focused strategies. Its role within the "Methanol Economy" and as an energy reservoir highlights its potential as both a transitional fuel and a crucial chemical feedstock. Beyond its function as a fuel, methanol contributes significantly to greenhouse gas emission reduction efforts and environmental risk mitigation. Advancements in fuel cell technologies further strengthen methanol's position in clean energy solutions, positioning it as an essential component in constructing a sustainable energy framework. The methanol production process involves diverse pathways and technologies, each with distinct advantages and challenges. These pathways include natural gas reforming, coal and biomass gasification, and carbon dioxide hydrogenation. Catalytic processes, notably employing copper-based catalysts like Cu/ZnO/Al2O3, play a pivotal role despite persistent challenges such as thermal stability and selectivity. Catalyst promoters such as Au, ZrO2, and alkali metals significantly enhance catalyst performance. Various reactor technologies, including gas-phase and liquid-phase systems, efficiently manage synthesis reactions while optimizing efficiency and selectivity. This chapter provides a comprehensive overview of different methanol production processes, the catalysts and promoters utilized, and various reactor technologies employed in this process.