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

Abstract

Au catalysts supported with carbon‐based carriers have been extensively studied for the hydrochlorination of acetylene and expected to replace toxic mercury catalysts. However, removal of the highly corrosive aqua regia used in the preparation of carbon‐based catalysts while maintaining catalytic activity and stability remains a key challenge. Herein, we present a green technology carrier, activated carbon fibers (ACF), to support gold catalysts for the hydrochlorination of acetylene. TPD and XPS analyses confirmed the presence of surface oxygen‐containing functional groups (SOGs) and pyrrolic N species on the ACF. The Au/ACF−H2O catalyst exhibited better catalytic activity and stability than Au/ROX0.8(AQ)−H2O. Characterization results revealed that the catalytic properties of Au/ACF−H2O could be attributed to the anchoring and stabilization of gold active species on the SOGs, leading to atomic dispersion, and to the improvement of HCl adsorption with the synergistic effect of electron‐donating pyrrolic N groups. The results indicated that usage of this green carrier can be considered as the a new approach to reduce or eliminate the use of strong oxidizing reagents in the preparation of Au catalysts.

Acetylene hydrochlorination over supported ionic liquid phase (SILP) gold-based catalyst: Stabilization of cationic Au species via chemical activation of hydrogen chloride and corresponding mechanisms

“…The XPS data were consistent with the HAADF-STEM micrographs of Au-N(CN)2/AC ( Figure 1d) and Au-Cl/AC ( Figure S7a). The existence of Au(0) with a small size in the Au-Cl/AC catalyst may be attributed to the reduction of Au(III) by the AC support [72] or the beam-induced photoreaction of Au(III) salts [36,62]. XPS fitting parameters for various samples are listed in X-ray absorption spectroscopy (XAS) was employed to evaluate the electronic structure and coordination environment of the Au-N(CN)2/AC and Au-Cl/AC catalysts by comparing the white-line intensity values (the magnitude of the electronic transition from the 2p3/2 core-level state to a vacant 5d state) and other spectral features with those of the reference samples (Au foil, KAuCl4, and (PPh3)AuCH3).…”

Promoting H2 Activation over Molybdenum Carbide by Modulation of Metal‐Support Interaction for Efficient Catalytic Hydrogenation

“…This is particularly the case for carbon-supported catalysts. [11] The physical and chemical properties of carbon matrices can be readily tailored by induction of dopants, defects, edges, etc., making carbon matrices excellent supports for transition-metalbased catalysts. [12] For example, nitrogen possesses a smaller atomic radius and higher electronegativity than carbon (C).…”

“…In addition, MSI can be modulated by changing, but not limited to, the composition and structure of supports. This is particularly the case for carbon‐supported catalysts [11] . The physical and chemical properties of carbon matrices can be readily tailored by induction of dopants, defects, edges, etc., making carbon matrices excellent supports for transition‐metal‐based catalysts [12] .…”

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

“…Jang et al prepared a series of Pd-Au catalysts by photocatalysis and studied the effects of these catalysts on the active performance of acetylene hydrogenation [16]. In addition, Au-based catalysts show excellent performance for the hydrogenation of C=N, C=O [17], phenylacetylene [18,19], acetylene hydrochlorination [20,21], and the catalytic cracking of light diesel oil [22]. For these catalysts, the support plays an important role, in which it not only influences Yuan Zhang and Xun Sun have contributed equally to this work.…”