Selective hydrogenation of acetylene in the presence of ethylene on zeolite-supported bimetallic catalysts

Rationally tuned micropores within enantiopure metal-organic frameworks for highly selective separation of acetylene and ethylene

“…level of acetylene ( > 5 p.p.m.) in ethylene can poison Ziegler-Natta catalyst during ethylene polymerizations and can also lower the product quality of the resulting polymers 39 . Moreover, the acetylenic compounds are often converted into solid, thus blocking the fluid stream and even leading to explosion 40 .…”

Effects of Zeolite Structures, Exchanged Cations, and Bimetallic Formulations on the Selective Hydrogenation of Acetylene Over Zeolite-Supported Catalysts

“…Potassium [7,27,28] and titanium [27] have also been reported as selective promoters on supported Pd catalysts for the selective hydrogenation of acetylene. Our previous studies [11] have also shown that Na ? or K ?…”

“…As studied previously, alloying Pd with Ag can increase the selectivity of acetylene hydrogenation. Our previous studies [11][12][13] have also shown that Pd-Ag bimetallic catalysts on either c-Al 2 O 3 or ion-exchanged bzeolite have higher selectivity for acetylene hydrogenation in the presence of excess ethylene than either of their monometallic counterparts.…”

“…Supported PdAg catalysts were synthesized using the incipient wetness method as described previously [11]. The PdCu and PdAu bimetallic catalysts were prepared by sequential impregnation using Pd(NO 3 ) 2 and then Cu(NO 3 ) 2 or a 1,000 lmol/L AuNO 3 solution (Alfa-Aesar company).…”

“…-b-zeolite and PdAg/K ? -b-zeolite, we have performed detailed batch and flow reactor studies, kinetic modeling, and TEM and EXAFS characterization [11][12][13].…”