Formation of Active Centers of Nickel–Zinc Catalysts Deposited on the Nanodiamond for the Selective Hydrogenation of Phenylacetylene

Promoting effect of Zn in high-loading Zn/Ni-SiO2 catalysts for selective hydrogen evolution from methylcyclohexane

“…The shift toward higher reduction temperatures was denoted earlier for the reduction of NiO supported on mesoporous substrates due to the presence of Zn. 35 In another work, 29 the reduction of nickel was shown to start at a lower temperature for the sample NiZn/ND (Ni : Zn = 1 : 1) than for the sample NiZn3/ND (Ni : Zn = 1 : 3). The authors associated the hindered reduction of NiO at a higher zinc content (Ni : Zn = 1 : 3) with the decoration of the surface of NiO particles with zinc oxide.…”

“…11,12,27,28 Despite the reduced conversion of MCH, a noteworthy increase in selectivity to toluene (about 97%) was demonstrated for the Zn-promoted Ni-based bimetallic system when compared to that of a monometallic one (66%). 11 Generally, the addition of Zn to metallic Ni catalysts has proven to be a promising option to enhance their catalytic performance in various applications, such as hydrogenation, [29][30][31][32][33] hydrogenolysis, 34 hydrodearomatization, 35 and electrocatalysis. 36 The modification of the metallic Ni phase with Zn was demonstrated to be advantageous for catalyzing glycerol hydrogenolysis to form 1,2-propyleneglycol.…”

“…Selective hydrogenation of phenylacetylene was shown to be enhanced over a NiZn/nanodiamond (ND) catalyst (Ni : Zn = 1 : 1). 29 However, to the best of our knowledge, scanty information is available in the literature about the catalytic performance of Ni-Zn catalysts in selective dehydrogenation reactions, particularly with regard to MCH conversion to toluene. 11,13 In fact, the study performed by Al-ShaikhAli et al 11,13 is the only work focusing on supported Ni-Zn catalysts.…”

“…Generally, the addition of Zn to metallic Ni catalysts has proven to be a promising option to enhance their catalytic performance in various applications, such as hydrogenation, 29–33 hydrogenolysis, 34 hydrodearomatization, 35 and electrocatalysis. 36 The modification of the metallic Ni phase with Zn was demonstrated to be advantageous for catalyzing glycerol hydrogenolysis to form 1,2-propyleneglycol.…”

“…Selective hydrogenation of phenylacetylene was shown to be enhanced over a NiZn/nanodiamond (ND) catalyst (Ni : Zn = 1 : 1). 29…”