Non-mercury catalytic acetylene hydrochlorination over spherical activated-carbon-supported Au–Co(III)–Cu(II) catalysts

• Published in: Journal of catalysis 2014-07, Vol.316, p.141-148
• Main Authors: Zhang, Haiyang, Dai, Bin, Li, Wei, Wang, Xugen, Zhang, Jinli, Zhu, Mingyuan, Gu, Junjie
• Format: Article
• Language: English
• Subjects: Acetylene hydrochlorination; Adsorbents; Au-based catalyst; Carbon deposition; Catalysis; Chemical engineering; Chemistry; Exact sciences and technology; General and physical chemistry; Long-term stability; Surface physical chemistry; Ternary Au–Co(III)–Cu(II) catalyst; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1016/j.jcat.2014.05.005

[Display omitted] •Ternary Au1Co(III)3Cu1/SAC shows high activity for acetylene hydrochlorination.•A synergic effect of Co(III) and Cu(II) augments the amount of Aun+.•Co(III) inhibits the reduction of Aun+ for its standard electrode potential.•Cu(II) further stabilizes the Au3+ through the way of electron transfer.•The estimated life of the ternary catalyst is greater than 6513h. Several Au-based catalysts, including catalysts containing Au, Au–Co(III), Au–Cu(II), and Au–Co(III)–Cu(II), were prepared and assessed for their ability to promote acetylene hydrochlorination. The catalysts were characterized by temperature-programmed reduction, temperature-programmed desorption, low-temperature N2 adsorption/desorption, thermogravimetric analysis, X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The synergistic effects of Co(III) and Cu(II) enhanced the adsorption of hydrogen chloride over the catalysts and increased the amount of the active species Au+ and Au3+ in the ternary Au1Co(III)3Cu(II)1 catalyst supported on spherical activated carbon. The catalyst attained 99.7% acetylene conversion, 99.9% selectivity to vinyl chloride, and an estimated lifetime exceeding 6513h. These results suggest that the ternary catalyst has potential industrial applications.