Engineering the geometric and electronic structure of Ru via Ru–TiO₂ interaction for enhanced selective hydrogenation

Abstract

Modulation of the metal-support interaction plays a key role in many important chemical reactions. Here, by adjusting the reduction method of the catalyst and introducing oxygen vacancies in TiO2 to...

Targeted regulation of the selectivity of cascade synthesis towards imines/secondary amines by carbon-coated Co-based catalysts

“…Since the spilled hydrogen would migrate and react easily with yellow WO 3 to form dark blue H x WO 3 , the catalyst was physically mixed with WO 3 and reacted at 40 °C under 1 MPa H 2 in an autoclave. 26,57,58 As shown in the photographs, the pure WO 3 powder was a bright yellow color in isopropanol solvent after grinding, and the colour did not change after 4 h of reaction. The colour of the Pt/SiO 2 @CN and WO 3 powder mixture also remained basically unchanged even after 4.5 h of reaction.…”

“…It is pivotal to control the adsorption abilities of the reactants and the intermediates for precise synthesis of the target product. [23][24][25][26][27] Exploiting effective strategies to modulate the imine or secondary amine selectivity remains a challenge.…”

Subsurface Ru-Triggered Hydrogenation Capability of TiO2–x Overlayer for Poison-Resistant Reduction of N-Heteroarenes

“…The reaction energy profiles of model surfaces are shown in Figure A. On the metallic Ru(101) or Ru(0001) surface (Figures S17–S22), the desorption energy of the partial hydrogenation product, py-THQ, is 4.02 eV, which prohibits the regeneration of Ru active sites at low temperature, even though the hydrogenation barrier of quinoline over Ru is less than 1.0 eV . In comparison, the desorption energies of py-THQ from Ru@TiO 2 -4Vo and TiO 2 -Vo are only 1.37 and 1.45 eV.…”

“…Transition metal oxides are another group of nonmetal material, which are commonly used as catalyst supports. Hydrogen can cleavage heterolytically over the oxide surface at the defects and acidic sites. , However, whether dissociated H atoms can be utilized for hydrogenation of N -heteroarenes and whether the subsurface metallic sites can modify the catalytic performance of oxide shells like the metal@C systems are still beyond the knowledge of the catalysis community.…”

“….02 eV, which prohibits the regeneration of Ru active sites at low temperature, even though the hydrogenation barrier of quinoline over Ru is less than 1.0 eV 23. In comparison, the desorption energies of py-THQ from Ru@ TiO 2 -4Vo and TiO 2 -Vo are only 1.37 and 1.45 eV.…”