Unraveling high alkene selectivity at full conversion in alkyne hydrogenation over Ni under continuous flow conditions

Abstract

Selective hydrogenation of alkynes into alkenes in continuous flow conditions over non-precious metal catalysts is an attractive prospect for the chemical industry, especially for the petrochemical and polymer industry. Achieving...

Continuous Flow Liquid‐Phase Semihydrogenation of Phenylacetylene over Pd Nanoparticles Supported on UiO‐66(Hf) Metal‐Organic Framework

“…Fixed bed flow reactors offer process intensification in terms of production per unit of time and enhanced catalytic performance can be achieved by the optimization of contact time between the reactants and catalyst [17] . The semi‐hydrogenation of PA with molecular hydrogen was performed in a down‐flow liquid‐phase quartz reactor (Figure S1) [12c] . The quartz reactor is present inside a programmable vertical furnace.…”

Enhancing Catalytic Performance through Subsurface Chemistry: The Case of C2H2 Semihydrogenation over Pd Catalysts

“…However, on the Pd-B 0.5 catalyst (Figure S4), the C 2 H 2 + C 2 H 2 coupling route is preferred kinetically compared to the other two routes (168. 4 S4) and Pd-C 0.5 catalysts (83.2 vs 174.4 kJ mol −1 , Figure S5). Thus, the Pd catalyst doped with 1.0 ML subsurface H cannot inhibit green oil, while the Pd catalyst doped with 1/2 ML subsurface B or C could.…”

“…2,3 As for the commonly used catalysts of alkyne semihydrogenation, the cheap Nibased and Cu-based catalysts show excellent catalytic performance. 4,5 However, it is difficult to achieve both high C 2 H 4 formation activity and selectivity at the same low temperature as Pd catalysts. 6,7 Meanwhile, Zhao et al 8 conducted a comprehensive discussion about the catalytic performance (activity, selectivity, stability, and cost) of Ag, Cu, Pd, Pt, Rh, and Ir catalysts.…”

“…Semihydrogenation of acetylene (C 2 H 2 ) to ethylene (C 2 H 4 ) is used in industry to remove trace C 2 H 2 from olefin, and the semihydrogenation of alkynes is also employed in the more demanding synthesis of ( E )-alkenes. , As for the commonly used catalysts of alkyne semihydrogenation, the cheap Ni-based and Cu-based catalysts show excellent catalytic performance. , However, it is difficult to achieve both high C 2 H 4 formation activity and selectivity at the same low temperature as Pd catalysts. , Meanwhile, Zhao et al conducted a comprehensive discussion about the catalytic performance (activity, selectivity, stability, and cost) of Ag, Cu, Pd, Pt, Rh, and Ir catalysts. Among them, Pd catalysts seem to be more suitable for C 2 H 2 semihydrogenation.…”

Intermetallic PdCu3 supported on nanodiamond–graphene for semi-hydrogenation of Phenylacetylene

“…8,9 Phenylacetylene impurities are commonly formed during the styrene synthesis process and can adversely affect polymerization catalysts, leading to their deactivation in polystyrene production units. 10 Supported Pd catalysts exhibit outstanding efficiency in hydrogenation, attributed to their remarkably low activation energy for H 2 dissociation. [11][12][13] However, this impressive hydrogenation capability also renders Pd susceptible to excessive hydrogenation during alkyne hydrogenation, leading to the unwanted formation of alkane byproducts.…”