Enhancement of Au/AC acetylene hydrochlorination catalyst activity and stability via nitrogen-modified activated carbon support

Comparative activity of CdS nanofibers superficially modified by Au, Cu, and Ni nanoparticles as co-catalysts for photocatalytic hydrogen production under visible light

“…The position of the signal is slightly lower than that of bulk gold, and it is usually assigned to small gold particles in the metallic state. The spectrum was deconvoluted into several components, the Au 0 4f 7/2 peaks were detected at a range of binding energy (BE) of 83.0–83.1 eV, typical of metallic gold; and the spectra binding energies at 86.2 and 89.9 eV were attributed to the presence of Au in the form of Au 3+ . The doublet corresponding to metallic gold (Au 0 ) is located at 84 eV (Au 4f 7/2 ) and 87.5 eV (Au 4f 5/2 ); the oxidized gold signal appears at higher binding energies (Au I 4f 7/2 at 84.7 eV and Au III 4f 7/2 at 85.2 eV) .…”

Synthesis of Vinyl Chloride Monomer over Carbon-Supported Tris-(Triphenylphosphine) Ruthenium Dichloride Catalysts

“…In his initial study the activity of metal catalysts is found to be related with the associated metal ions' standard electrode potentials [1] and AuCl 3 has a higher electrode potential. Subsequently, there was a great deal of research on gold catalysts [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, Au-based catalysts do not have their advantages of economic performance because of the high price of Au.…”

Alternative solvent to aqua regia to activate Au/AC catalysts for the hydrochlorination of acetylene

“…Although the shift in BE of the Au4f 7/2 core level is small, it is somewhat larger than the measurement error (±0.02 eV). Thus, it can reasonably be assumed that electron transfer from nitrogen atoms to Au atoms may take place, which leads to an increase in the electron density of the Au center [17]. Further, the possibility that the shift of Au4f 7/2 to the higher energies observed for the Au(H 2 O)/AC(OAR) sample may be correlated with the nanosized effects caused by both initial state effects and final state effects cannot be ruled out [60].…”

“…Promotion of catalytic activity by nitrogen atoms is known in the literature under the term ''N-doped" and is of high technical relevance to the catalytic performance [49][50][51]. In the case of acetylene hydrochlorination, it has been reported that N-doped Au/carbon catalysts are more active than the respective unmodified catalysts [17,52]. Regarding the high-resolution spectra of S2p (Fig.…”

“…Among the numerous metal chlorides [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and inorganic catalytic materials such as nitrogen-doped carbon [26][27][28], AC-supported g-C 3 N 4 [29], C-doped boron nitride fullerene [30], and 13X zeolite [31], AC-supported AuCl 3 catalysts are considered the most promising materials for acetylene hydrochlorination [32][33][34]. Compared with HgCl 2 for acetylene hydrochlorination, AC-supported AuCl 3 catalysts significantly improve the catalytic activity.…”