Introducing Oxygen Vacancies and Ti³⁺ on Rh/TiO₂ via Plasma Treatment for CO Hydrogenation to Ethanol

Abstract

Rh-based catalysts are widely used in CO hydrogenation to ethanol. In this work, Rh/TiO 2 catalysts were prepared by glow discharge plasma. Rhodium salt was reduced by electrons in an electric field at room temperature. Oxygen vacancies and Ti 3+ were produced on the surface of Rh/TiO 2 by plasma. The defects promoted the synergistic effect of Rh and TiO 2 through the enhanced interaction between active metal and supporter. Ti 3+ is beneficial for the adsorption of intermediate formyl group. In situ IR revealed that the bridged and linear adsorption mechanisms of CO can promote the formation of ethanol intermediates. Rh/TiO 2 catalysts by plasma exhibited a superior space-time yield of 0.106 g MeOH •g cat −1 h −1 , at 260 °C and 3 MPa, which was approximately 1.8 times that by traditional hydrogen reduction.

Investigating the role of oxygen vacancies in metal oxide for enhanced electrochemical reduction of NO3− to NH3: mechanistic insights

“…135,136 This approach, characterized by its simplicity, high efficiency, and short experimental time, has found extensive application in generating OVs across various materials for various purposes. 53,137,138 To demonstrate this phenomenon, OVs were induced on Co 3 O 4 through a 2-minute treatment using Ar plasma (250 W) (Fig. 9a), 114 while H-doped black titania (TiO 2 @TiO 2− x H x ) enriched with OVs was achieved by subjecting it to H 2 plasma.…”