C, N Co-Decorated Alumina-Supported Au Nanoparticles: Enhanced Catalytic Performance for Selective Hydrogenation of Acetylene

Abstract

The modifications of support for the dispersion and immobilization of gold nanoparticles were examined for the selective hydrogenation of acetylene to ethylene. The catalyst, denoted as Au/CNA, was prepared by the carbonization of C and N atom-containing organic precursors on Al 2 O 3 , which were subsequently used as supports for gold nanoparticles. The TOF value of Au/CNA was five times higher than that of Au/Al 2 O 3 at 250 °C. The carbonization modification of Al 2 O 3 support without N species showed almost no change in catalytic activity. Therefore, the improved catalytic performance of Au/CNA is related to the interactions of the N species on the CNA support with nano-gold particles. From the XPS analysis, electron transfer between gold and C, N co-doped species may play an important role in the high levels of Au active site utilization. This study may provide new avenues for the construction of organic/inorganic composite materials for efficient catalytic hydrogenation applications.

Au Nanoparticles Supported on Hydrotalcite-Based MMgAlOx (M=Cu, Ni, and Co) Composite: Influence of Dopants on the Catalytic Activity for Semi-Hydrogenation of C2H2

“…X. Sun et al have previously reported that, since acetylene belongs to the acidic molecules, the alkaline nature of the catalyst surface has a positive effect on the adsorption of acetylene on the Au surface, which can lead to a better catalytic performance of the catalyst [49]. Therefore, it was hypothesized that a higher base/acid ratio has an auxiliary effect on the adsorption of acetylene at the perimeter of Au nanoparticles, which is a potential reason for the higher acetylene conversion of the Au/CuMgAlO x catalyst.…”

“…Y. Zhang et al reported strong interactions between the N species on the support and Au nanoparticles, and the TOF value of Au/CNA was five times higher than that of Au/Al 2 O 3 [49]. L. Sun et al added CeO 2 to Au/Al 2 O 3 catalysts to change the acidbase properties of the support surface and electronic states of the Au species to improve catalytic activity [50].…”

Word Summit “Catalysis Engineering & Technology” (CatET-2019)

“…This Special Issue of Topics in Catalysis contains a selection of contributions from the participants in CatET-2019. The selected articles [ 1 – 9 ], which went through a rigorous peer-review process, represent the most interesting topics addressed at the congress.…”

“…Gold catalysts are the protagonists of articles [ 1 – 3 ]. Gold nanoparticles supported on C and N co-decorated alumina [ 1 ] and on Ce–Zr oxides [ 2 ] were investigated for selective hydrogenation of acetylene, and polyaniline microtubes have been proposed as a support for gold nanoparticles to improve the catalytic performance in reduction of nitrophenols [ 3 ].…”