Multiple steady states in the oxidative steam reforming of methanol

Unlocking dynamics of compact methanol reformers during on‐line catalyst activation using transient computational fluid dynamics simulation

“…Despite higher inlet flow rates, the reduction progress during does not transpire when the inlet temperature is maintained below 433 K. However, when the inlet temperature reaches 453 K, a sharp rise in the local temperature is observed within the catalyst bed (Figure 7), indicative of temperature runaway. This phenomenon aligns with the findings of Kim et al, 37 who investigated the multistability of exothermic reactions under heat exchange conditions. An analysis of Figure 7A reveals that temperature runaway initiates at 7.91 s when the local temperature at the catalyst bed outlet reaches 728 K. The excessive heat generated near the outlet is insufficiently dissipated by the flow, causing a precipitous temperature increase.…”

Catalysts for Sustainable Hydrogen Production: Preparation, Applications and Process Integration

“…The OSRM is a combination of an exothermic reaction between O 2 and methanol and the endothermic reaction of steam reforming. The exothermic reaction has frequently been assumed to be the partial oxidation (PO) of methanol [206]; however, more recently it was found that with the commercial Cu/ZnO/Al 2 O 3 catalyst, the combustion of methanol is the main reaction between oxygen and methanol [207]. This process presents some advantages, such as the possibility to produce hydrogen with a very low concentration of CO; moreover, it is suitable for power variation by varying the methanol/oxygen ratio [208].…”

Recent progress of heterogeneous catalysts for transfer hydrogenation under the background of carbon neutrality

“…There are four primary routes for hydrogen production from the traditional thermal catalytic process: methanol steam reforming (MSR), 78–80 methanol decomposition (MD), 81,82 partial oxidation of methanol (POM), 83,84 and a combination of oxidative methanol steam reforming (OMSR, MSR, and POM), also known as auto-thermal reforming of methanol (ATRM). 85–87 The main approach for producing hydrogen at present is methanol steam reforming (CH 3 OH + H 2 O → CO 2 + 3H 2 ). However, this process is energy-intensive, demanding specific temperature and pressure conditions, thus leading to substantial fossil energy consumption and the generation of carbon dioxide as a by-product.…”