Fabrication of supported PdAu nanoflower catalyst for partial hydrogenation of acetylene

Fabrication of a PdAg mesocrystal catalyst for the partial hydrogenation of acetylene

“…Moreover, Yang et al found that tetradecyltrimethylammonium bromide-capped porous Pt particles exhibited superior catalytic activity in ethene hydrogenation compared with polyvinylpyrrolidone-capped Pt cubes and cuboctahedra [24]. Our previous work also confirmed the enhancement of activity and stability in partial hydrogenation after fabrication of 30-50 nm nanoflower structures of a PdAu nanocatalyst [31]. Mesocrystals (MCs) are 3D nanostructures that have an ordered superstructure that possesses not only the above-mentioned characteristics, but also some additional features such as a single crystalline structure, ordered facets, and perpendicular porosity [32][33][34][35][36][37].…”

“…The resulting defect sites, which can serve as the active sites for breaking chemical bonds, should enhance the catalytic activity [25,[51][52][53]. Indeed, we have previously observed that grain boundaries can facilitate H 2 activation/dissociation in partial hydrogenation reactions [31,54]. In addition, subsurface hydrogen, which is known to facilitate over hydrogenation, is more easily formed on Pd (1 0 0) than on Pd (1 1 1) [55][56][57][58][59].…”

Preparation and structure-property relationships of supported trimetallic PdAuAg catalysts for the selective hydrogenation of acetylene

“…A comparison of the catalytic performance of m-PdAuAg 2 in the partial hydrogenation of acetylene with that of other catalysts reported in the literatures is also shown in Table 1. The ethene selectivity of the mPdAuAg 2 trimetallic catalyst at >99% conversion is higher than that of majority catalysts [15,16,34,36], but the value is still lower than that of the Pd-based catalyst reported by the Anderson group.…”

“…Our group successfully introduced the 3D nanostructures of PdAu and PdAg catalysts into the selective hydrogenation of acetylene, and these catalysts exhibited preferred activity and selectivity. The rich defect sites in the catalysts could facilitate H 2 dissociation/activation and the synergetic effect between the building blocks weakened the adsorption of C 2 H 4 species on the catalyst surfaces [15,16].…”

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

“…Interestingly, turnover frequency (calculated on the basis of Pd surface atoms) increases to a maximum point as Ag/Au surface coverage approach 0.9. PdAu particle morphology was explored by Ma et al [53] who prepared bimetallic nanoparticles with octahedral and a 'nanoflower' shape (organised agglomerates of the octahedra). Catalytic testing indicated that the unique nanoflower morphology resulted in higher activity, ethylene selectivity and stability when compared with the sample possessing octahedral shape.…”