Rhenium promotion of Ag and Cu–Ag bimetallic catalysts for ethylene epoxidation

Ethylene Epoxidation over Alumina- and Silica-Supported Silver Catalysts in Low-Temperature AC Dielectric Barrier Discharge

“…When comparing the combined catalytic-DBD system with the sole DBD system, the supported Ag catalysts, especially the 20 wt% Ag/SiO 2 catalyst, promoted the ethylene epoxidation (6,7) due to the observed higher EO selectivity, and tended to suppress the combustion (8-10, 13-15) and dehydrogenation (11,12,(18)(19)(20)(21)(22) reactions due to the lower selectivities for H 2 , CO, and C 2 H 2 , whereas the combustion and dehydrogenation reactions could favorably occur in the sole DBD system, leading to decreasing EO selectivity and increasing selectivities for other main products.…”

“…Silver catalysts are generally used in this reaction, especially low-surface-area (LSA) a-alumina-supported silver catalyst (Ag/(LSA) a-Al 2 O 3 ). Several second metals, such as Cs, Cu, Au and Re, loaded on silver catalysts, as well as chlorides added to reactant gases, have been proved to enhance EO selectivity [4][5][6][7][8][9][10][11][12][13][14][15]. In addition, the epoxidation activity is always affected by the properties of the supports [12,[16][17][18].…”

An investigation on the role of Re as a promoter in Ag Cs Re/α-Al 2 O 3 high-selectivity, ethylene epoxidation catalysts

“…The use of Re as a promoter is much less understood, as recently stated by Barteau et al [38]. This is especially relevant because the patent literature as early as 1984 [21] described that significant enhancements in EO selectivity were achieved by Re promotion of AgACs/a-Al 2 O 3 catalysts.…”

Ethylene epoxidation in a low-temperature parallel plate dielectric barrier discharge system with two frosted glass plates

“…EO is commercially produced from the gas-phase partial oxidation of ethylene or ethylene epoxidation over Ag/low surface area (LSA) a-Al 2 O 3 catalysts with an addition of promoters [1][2][3][4][5][6].…”