Thermochemical stress development in ceramic catalyst supports

Role of Stress in Reaction Engineering Catalytic and Noncatalytic Reactions

“…This phenomenon is known as flickering for catalytic oxidation of ammonia on Pt/Rh gauges, synthesis of HCN, catalytic oxidation of methanol to formaldehyde on Ag catalyst, and certain catalytic combustion reactions (e.g., partial oxidation/dehydrogenation of certain hydrocarbons). Thiart et al (1991Thiart et al ( , 1993 studied the problem of thermal stress development in catalyst particles and considered the dynamic form of the thermoelastic problem. The creation and propagation of a thermal shock was analyzed for a sudden increase of surface temperature, which can occur during the ignition process.…”

Crack propagation in catalytic pellets due to thermal stresses

“…Fixed boundaries are not a prerequisite; however, thermal stress can also develop in traction-free bodies. Thiart et al (1990Thiart et al ( , 1993 studied thermal shock in catalytic pellets, including effects of temperature-dependent physical properties on the stress fields. These studies focused on the thermal stresses and how they form due to chemical reactions.…”

Analysis of steady‐state reaction fronts in a porous medium

“…The bed is shallow, because the front is thin and the conversion is high. Apart from problems with blowout (that is, the front is not stabilized within the bed), continuous changes in the position of the front can lead to mechanical failure of the support materials (Thiart et al, 1991(Thiart et al, , 1993. Another technology that is closely related to this is porous radiant burners (PRB).…”