A highly active catalyst derived from CuO particles for selective hydrogenation of acetylene in large excess ethylene

Abstract

The removal of acetylene impurities is indispensable in the production of ethylene. Ag-promoted Pd catalyst is industrially used to remove acetylene impurities by selective hydrogenation. It is highly desirable to...

Bi-modified Cu-Based Catalysts for Acetylene Hydrogenation: Leveraging Dispersion and Hydrogen Spillover

“…The presence of Cu 2+ may be due to the passivation process and the reoxidation of Cu 0 in air. The peak at 934.3 eV between Cu 2+ and Cu 0 is ascribed to the Cu δ+ of the Cu x C phase. , The main peak in the C 1s spectra (Figure d) can be deconvoluted to three peaks at 284.6, 285.8, and 286.9 eV, which correspond to the C–C, C–H, and C–O species, respectively, while the shoulder peak at around 283.6 eV is related to the Cu–C species in Cu x C. ,, The XPS spectrum in the Bi 4f region for CuBi/SiO 2 (H-TR) is shown in Figure S20. Two peaks at 158.6 and 163.8 eV correspond to the Bi 4f 7/2 and Bi 4f 5/2 of Bi 3+ species in Bi 2 O 3 , respectively, indicating that the Bi species are in the form of Bi 2 O 3 in CuBi/SiO 2 (H-TR).…”

“…In the case of better thermal stability of copper acetylide, more Cu x C can be formed during the hydrogen reaction procedure, and less Cu phase is formed from the decomposition of copper acetylide. 46 Therefore, the thermal stability of copper acetylide derived from different precursors (pre-Cu/SiO 2 , pre-Cu/SiO 2 (H), and pre-CuBi/ SiO 2 (H)) was investigated through TG-DSC measurements (Figure S21). The copper acetylides were prepared by treating the precursors (pre-Cu/SiO 2 , pre-Cu/SiO S2), respectively, which are significantly higher than those of the corresponding precursors (pre-Cu/SiO 2 , pre-Cu/ SiO 2 (H) and pre-CuBi/SiO 2 (H)), mainly due to the formation of carbon species.…”

“…The peak at 934.3 eV between Cu 2+ and Cu 0 is ascribed to the Cu δ+ of the Cu x C phase. 45,46 The main peak in the C 1s spectra (Figure 3d) can be deconvoluted to three peaks at 284.6, 285.8, and 286.9 eV, which correspond to the C−C, C− H, and C−O species, respectively, 53 while the shoulder peak at around 283.6 eV is related to the Cu−C species in Cu x C. 8,54,55 The XPS spectrum in the Bi 4f region for CuBi/SiO 2 (H-TR) is shown in Figure S20. Two peaks at 158.6 and 163.8 eV correspond to the Bi 4f 7/2 and Bi 4f 5/2 of Bi 3+ species in Bi 2 O 3 , respectively, indicating that the Bi species are in the form of Bi 2 O 3 in CuBi/SiO 2 (H-TR).…”

“…In our recent studies, a new interstitial copper carbide (Cu x C) phase was prepared and displayed excellent hydrogenation activity in processes such as acetylene, glycerol, and furfural hydrogenation. − DFT calculation results reveal that the H 2 dissociation ability of Cu x C is much higher than that of metal Cu catalysts . Therefore, constructing the Cu x C–Cu catalysts by replacing Pd with Cu x C is an effective approach to achieve outstanding performance for acetylene hydrogenation over nonprecious metal catalysts.…”

“…Previous results have shown that the formation of Cu x C is directly related to the thermal stability of copper acetylide formed through the reaction between copper carbonate and acetylene. In the case of better thermal stability of copper acetylide, more Cu x C can be formed during the hydrogen reaction procedure, and less Cu phase is formed from the decomposition of copper acetylide 46. Therefore, the thermal stability of copper acetylide derived from different precursors (pre-Cu/SiO 2 , pre-Cu/SiO 2 (H), and pre-CuBi/ SiO 2 (H)) was investigated through TG-DSC measurements (FigureS21).…”