Sulfur and nitrogen co-doped mesoporous carbon with enhanced performance for acetylene hydrochlorination

Carbon with Surface‐Enriched Nitrogen and Sulfur Supported Au Catalysts for Acetylene Hydrochlorination

“…Au/AC, 84.1 eV, Figure b). Meanwhile, the same changes were noted for N, S‐AC‐700, the peak corresponding to pyrrolic N of Au/N, S‐AC‐700 catalyst was 0.4 eV higher than the standard BE of 400.4 eV (Figure S5) . Reduction on the reaction activation energy (Figure b) and the negative shift of Au 3+ binding energy (Figure b) caused by doping of heteroatoms can be ascribed to the electrons transferred from pyrrolic N to the Au 3+ center, thus the formation of a complex between Au 3+ and pyrrolic N via π‐σ coordination bond.…”

“…In general, the kinds and contents of N species could be affected by the calcination temperature ,,. The coexistence of pyrrolic N and pyridinic N species in N, S‐AC‐500, N and N, S‐AC‐600 samples were evidenced by the major peaks at 400.4 eV and 398.8 eV, respectively (Figure a) .…”

“…It is vital to explore the effect of sulfur on the formation of nitrogen species; therefore, comprehensive examination was conducted on N, S‐AC‐700, the catalyst sample with the lowest pyridinic N contents. On the S 2p spectrum of N, S‐AC‐700, peaks at 163.8 and 167.8 eV were assigned to be sulfide groups (−C−S−C−) and oxidized sulfur groups (−C−SO x −C−), respectively (Figure S3) . However, the peak corresponding to the N−S bonds (168.22 eV) was not found on the spectrum of N, S‐AC‐700 sample (Figure S3), which excluded the possible doping of S atoms on the pyrrolic N and pyridinic N matrix.…”

Metal–organic framework‐derived cobalt and nitrogen co‐doped porous carbon with four‐coordinated Co–Nx for efficient acetylene hydrochlorination

“…Former researches have manifested that metal atoms (Co or Fe) will be bonded with N atoms of pyridinic type to form four‐ or two‐coordinated structures (shown in Figure c) in most cases after heat treatment at high temperature (above 800°C). As previously reported, we think pyridinic N plays a vital role in the performance of N‐doped carbon catalysts for acetylene hydrochlorination. Due to the similar type of N atoms as pyridinic N, Co–N x may be favorable for the catalyst activities in this reaction.…”

An Alternative Carbon Carrier in Green Preparation of Efficient Gold/Carbon Catalyst for Acetylene Hydrochlorination

“…Figure 5a shows that the curve of Au/ ACFÀ H 2 O could be well deconvoluted into two individual peaks at 398.3 and 400.4 eV, demonstrating the coexistence of pyridinic N and pyrrolic N, respectively. [48][49][50][51] Moreover, the relative contents and binding energies of the existing nitrogen species in the catalysts according to XPS are summarized in Table 5, which shows that the content of pyrrolic N of Au/ ACFÀ H 2 O was as high as 79.98 % of the N species, but no N species were observed in the spectra of the Au/ROX0.8À H 2 O catalysts. The schematic diagrams in Figure 5b show that fractional N species were observed.…”