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

A structured catalyst with high dispersity of Au species based on hollow SiC foam with porous walls for acetylene hydrochlorination

“…Moreover, for structured catalyst, the stability is also related to its activity. The active components with better distribution and smaller particle size have higher catalytic activity, 34 so the conversion near 100% in per unit time only requires fewer catalysts to participate in the reaction. This may also be one of the reasons for the longer lifetime of the Au/AC/SHF p structured catalyst.…”

“…There are two main reasons for the deactivation of Au-based catalysts: (1) reduction of cationic Au species (Au 3+ and Au + ) to metallic Au 0 species in the presence of an electron-rich substrate (such as C 2 H 2 ), aggregation of Au 0 species or Au nanoparticles because of the high surface energy; (2) the carbonaceous deposited on the surface of catalyst covers the active sites. 31,34,35 On the one hand, as evidenced by the TEM and SEM images (Fig. 7 and 9), the distribution of active sites on the Au/AC/HSF p is better, and the particle size is smaller than that of Au/AC/HSF c .…”

Constructing the single‐site of pyridine‐based organic compounds for acetylene hydrochlorination: From theory to experiment

“…Active species of mercury‐free catalysts can be divided into three types: noble metal, non‐noble metal, and metal‐free. Noble metal catalysts like Au, [ 8–12 ] Pt, [ 13,14 ] Pd, [ 15–17 ] and Ru, [ 18–22 ] show prominent activity towards acetylene hydrochlorination. Non‐noble metal catalysts such as Bi, [ 23,24 ] Cu, [ 25–27 ] and Sn, [ 28 ] enjoy a competitive edge on pricing but suffer from significantly deactivation because of the reduction and loss of active species.…”

The influence of supports on Rh‐TPPTS supported ionic liquid‐phase catalysts for the hydroformylation of ethylene**

“…SILP materials enables the application of fixed-bed technology facilitating a continuous process and facile product separation, and many supports have already been used for SILP catalysis including silica, Merrifield resin, activated carbon, SBA-15, MCM-41, alumina, titania and cellulose. [14][15][16][17][18][19][20][21][22] Rh-complex based SILP catalysts with various ILs, phosphine/phosphite ligands and supports have previously been synthesized, characterized and tested for hydroformylation of olefins with chain lengths C3-C8. [1,2,4,10,[23][24] SILP catalysts for C2 olefin (ethylene) hydroformylation was first reported by us in 2012, and the catalysts were found highly active with TOF values up to 800 h À 1 .…”