Hydrogenation of Propyne Verifying the Harmony in Surface and Bulk Compositions for Fe-Ni Alloy Nanoparticles

The emergence of Heusler alloy catalysts

“…This reaction is important for removing alkyne impurities from alkene feedstocks because the impurities inhibit the polymerization process of alkenes [16,17]. Figure 7(c), the selectivity was high when the conversion was low, decreasing as the conversion increased, which is typical behavior for ordinary catalysts because of the strong adsorption of alkynes inhibiting re-adsorption of alkenes [19][20][21]. In contrast, Co 2 MnGe and Co 2 FeGe showed a high selectivity even when conversion was at 100%, as shown in Figure 7(a,b).…”

Synthesis of Co2FeGe Heusler alloy nanoparticles and catalysis for selective hydrogenation of propyne

“…In general, strong adsorption of C 3 H 4 prevents re-adsorption of C 3 H 6 , which suppresses the further hydrogenation of C 3 H 6 , resulting in high C 3 H 6 selectivity when the C 3 H 4 conversion is below 100%. Once all C 3 H 4 is consumed, C 3 H 6 is quickly hydrogenated; thus, the C 3 H 6 selectivity drastically decreases once the C 3 H 4 conversion achieves 100% in most catalysts, including pure metals 29,30 and Co 2 FeGa 11 (Fig. S1a and b †).…”

Co2FeGe Heusler Alloy Nanoparticle Catalysts for Propyne Hydrogenation and Ammonia Decomposition

“…In general, the alkene selectivity tends to be high when the alkyne conversion is less than 100 % because the alkene products desorbed from catalyst surfaces hardly adsorb again due to alkyne molecules adsorbing strongly on the surfaces. [ 6 , 20 , 21 ] All the samples in Figure 3 followed this tendency. After the C 3 H 4 conversion reached 100 %, sample 1) kept a high C 3 H 6 selectivity over 70 %; however, samples 2 and 3) lost the selectivity, which indicated the existence of low‐selective sites on the catalyst surfaces.…”

“…Figure 3 shows catalytic properties for the C 3 H 4 hydrogenation. In general, the alkene selectivity tends to be high when the alkyne conversion is less than 100 % because the alkene products desorbed from catalyst surfaces hardly adsorb again due to alkyne molecules adsorbing strongly on the surfaces [6,20,21] . All the samples in Figure 3 followed this tendency.…”