A cyclic reactor study of ethylene epoxidation

Periodic operation of catalytic reactors—introduction and overview

“…Multi-part cycles could be useful in some circumstances, such as flushing the catalyst surface to desorb reactant or product before exposing the surface to a second reactant. Park et al [44] and Lang et al [45,46] have employed multi-part cycles in their investigations of the partial oxidation of Ca hydrocarbons. Fig.…”

Simulation of selective reactions’ performance in transient regimes with periodical separate feeding of reagents

“…This hypothesis was experimentally confirmed for numerous selective oxidation reactions, performed in "anaerobic" conditions, such as oxidation of methane to syngas [3][4][5][6] at transient metal oxides, ethylene to ethylene oxide [7,8] and propylene to propylene oxide [9] at supported silver catalysts, butane to butadiene at Sb/Sn oxide catalyst [10], n-butane to butane and butadiene at vanadia-magnesia catalyst [11], propane to propylene [12][13][14][15][16] and many others.…”

Surface-Mediated NH and N Addition to Styrene on Ag(110)

“…Silver-based catalysts are renowned for their importance for highly selective epoxidation of ethylene, producing ethylene oxide with a selectivity g90%. 1,2 Equally impressive selectivities are found for the conversion of methanol to formaldehyde by metallic silver. 3 Because incremental improvements in selectivity are important for the economics of ethylene oxide production, tremendous effort has been devoted to elucidating the mechanism of oxygen addition to olefins by silver catalysts.…”

“…Silver-based catalysts are renowned for their importance for highly selective epoxidation of ethylene, producing ethylene oxide with a selectivity ≥90%. , Equally impressive selectivities are found for the conversion of methanol to formaldehyde by metallic silver . Because incremental improvements in selectivity are important for the economics of ethylene oxide production, tremendous effort has been devoted to elucidating the mechanism of oxygen addition to olefins by silver catalysts. − However, except for recent studies with gold, the heterogeneously catalyzed addition of nitrogen (NH x , x = 0−2) to unsaturated hydrocarbons has not been studied, despite the fact that the products of these reactions are important chemical intermediates. − Adsorbed NH, being isoelectronic with O, at least to first order, may possibly react with olefins in a fashion similar to adsorbed O on silver surfaces.…”