Crystal-plane effects of anatase TiO2 on the selective hydrogenation of crotonaldehyde over Ir/TiO2 catalysts

The Roles of Precursor-Induced Metal–Support Interaction on the Selective Hydrogenation of Crotonaldehyde over Ir/TiO2 Catalysts

“…Noble metals (e.g., Pt [4][5][6][7][8][9], Au [10], Ru [11] and Ir [12][13][14]) supported on reducible oxides (e.g.,TiO2 [4][5][6][12][13][14], Ga2O3 [7], CeO2 [8,10] and ZnO [9,11]) are efficient catalysts in the hydrogenation of CRAL. The behaviors of these catalysts can be modulated by metalsupport interactions (MSI), which are used to accelerate the hydrogenation of the C=O bond by creating the metal-support interfacial sites [4,12,14].…”

“…It was found that the higher concentration of oxygen deficiency in the Ir/TiO2-{101} could effectively improve the catalytic performance compared to the Ir/TiO2-{001}. Moreover, the choice of Ir as the active noble metal for the selective hydrogenation of CRAL is because Ir catalysts are more selective compared to Pt and Au Noble metals (e.g., Pt [4][5][6][7][8][9], Au [10], Ru [11] and Ir [12][13][14]) supported on reducible oxides (e.g.,TiO 2 [4][5][6][12][13][14], Ga 2 O 3 [7], CeO 2 [8,10] and ZnO [9,11]) are efficient catalysts in the hydrogenation of CRAL. The behaviors of these catalysts can be modulated by metal-support interactions (MSI), which are used to accelerate the hydrogenation of the C=O bond by creating the metal-support interfacial sites [4,12,14].…”

“…Moreover, the choice of Ir as the active noble metal for the selective hydrogenation of CRAL is because Ir catalysts are more selective compared to Pt and Au Noble metals (e.g., Pt [4][5][6][7][8][9], Au [10], Ru [11] and Ir [12][13][14]) supported on reducible oxides (e.g.,TiO 2 [4][5][6][12][13][14], Ga 2 O 3 [7], CeO 2 [8,10] and ZnO [9,11]) are efficient catalysts in the hydrogenation of CRAL. The behaviors of these catalysts can be modulated by metal-support interactions (MSI), which are used to accelerate the hydrogenation of the C=O bond by creating the metal-support interfacial sites [4,12,14]. The nature of such a metal-support interface could be tuned in various ways, and one of the approaches is the choice of the metal precursors.…”

“…Fortunately, recent advances in the synthesis of oxide nanocrystals with uniform and well-defined morphologies have brought up new opportunities for more unambiguous investigation. For example, anatase TiO 2 nanocrystals with 98% {101}-crystalplane exposed could be synthesized successfully [14], and this oxide has shown promising potential in the selective hydrogenation of CRAL. In our recent work [14], we prepared various Ir catalysts supported on anatase TiO 2 exposing different crystal planes (e.g., {101}, {100} and {001} planes) and compared their reaction behaviors in the hydrogenation of CRAL.…”

“…For example, anatase TiO 2 nanocrystals with 98% {101}-crystalplane exposed could be synthesized successfully [14], and this oxide has shown promising potential in the selective hydrogenation of CRAL. In our recent work [14], we prepared various Ir catalysts supported on anatase TiO 2 exposing different crystal planes (e.g., {101}, {100} and {001} planes) and compared their reaction behaviors in the hydrogenation of CRAL. It was found that the higher concentration of oxygen deficiency in the Ir/TiO 2 -{101} could effectively improve the catalytic performance compared to the Ir/TiO 2 -{001}.…”