Catalyst Deactivation Due to Pore-Plugging by Reaction Products

Abstract

ed no heating in order to remove water fed to the reactor and formed during the reaction.

Effect of catalyst pore and pellet sizes on deactivation in SRC oil hydrotreatment

“…This prediction is consistent with the theoretical treatment by Haynes and Leung (1983), and is supported by the results from fuel oil hydrotreatment (Newson, 1975). On the other hand, this conclusion disagrees with that of Masamune and Smith (1966), Murakami et al (1968), Lee and Butt (1973), Polinski et al (1981), and Stiegel et al (1982).…”

“…Their results show that when pore plugging as well as active site poisoning is considered, the catalysts with lower diffusional resistance are more advantageous than those with higher resistance in terms of activity and life of the catalysts. Newson (1975) proposed a pore-plugging model to describe hydrotreatment catalyst deactivation in axial flow trickle-bed reactors. In his model he assumed a Maxwellian pore size distribution and a parallel fouling reaction.…”

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

“…Therefore, the reaction temperature in this study was set to 600 °C to study the coking behavior, which is one of the DRM main issues. Carbon deposition during DRM is known to cause catalyst deactivation and reactor plugging [53]. High WHSV (170 L/(gcat × h)) was applied to clearly discriminate the coking resistance among the catalysts.…”

“…According to a previous DRM review [49], carbon formation occurs due to methane decomposition (MD) above 550 • C as well as the Boudouard (BD) reaction below 700 • C. Therefore, the reaction temperature in this study was set to 600 • C to study the coking behavior, which is one of the DRM main issues. Carbon deposition during DRM is known to cause catalyst deactivation and reactor plugging [53]. High WHSV (170 L/(g cat × h)) was applied to clearly discriminate the coking resistance among the catalysts.…”

“…This high coking resistance can also be correlated to the low Ni content and high surface area of the support, by which both the metal and carbon species can be highly dispersed. Such dispersion results in less formation of big Ni particles and lower pore plugging by coke deposition, suppressing fast catalyst deactivation [53].…”