Study on Rh(I)/Ru(III) Bimetallic Catalyst Catalyzed Carbonylation of Methanol to Acetic Acid

Abstract

In this study, a Rh(I)/Ru(III) catalyst with a bimetallic space structure was designed and synthesized. The interaction between the metals of the bimetallic catalyst and the structure of the bridged dimer can effectively reduce the steric hindrance effect and help speed up the reaction rate while ensuring the stability of the catalyst. X-ray photoelectron spectroscopy (XPS) results show that rhodium accepts electrons from chlorine, thereby increasing the electron-rich nature of rhodium and improving the catalytic activity. This promotes the nucleophilic reaction of the catalyst with methyl iodide and reduces the reaction energy barrier. The methanol carbonylation performance of the Rh/Ru catalyst was evaluated, and the results show that the conversion rate of methyl acetate and the yield of acetic acid are 96.0% under certain conditions. Furthermore, during the catalysis, no precipitate is formed and the amount of water is greatly reduced. It can be seen that the catalyst has good stability and activity.

Homogeneous Catalysis for the Conversion of CO2, CO, CH3OH, and CH4 to C2+ Chemicals via C–C Bond Formation

“…Alternatively, Dutta reported that Rh­(I) complexes with quinolines and quinoline carboxaldehyde and carboxylic acid derivatives as ligands are also efficient catalysts for methanol carbonylation to form acetic acid and methyl acetate. , Soon after, the same group reported that Rh­(I) complexes with acetylpyridine ligands catalyze methanol carbonylation to acetic acid with a TON of 1581–1654 . Most recently, Ji and co-workers reported a bimetallic Ru–Rh catalyst, 14.10 , that is more stable than the Monsanto catalyst because of the interaction between Ru and Rh . The steric hindrance within the catalyst and its folded structure prevented deactivation over the reaction course, reaching a TOF of 32 million h –1 and a TON of 32 million.…”

“…125 Most recently, Ji and co-workers reported a bimetallic Ru−Rh catalyst, 14.10, that is more stable than the Monsanto catalyst because of the interaction between Ru and Rh. 126 The steric hindrance within the catalyst and its folded structure prevented deactivation over the reaction course, reaching a TOF of 32 million h −1 and a TON of 32 million. Under the same reaction conditions, the Monsanto catalyst showed a TOF of 7.6 million h −1 and a TON of 7.6 million.…”

Metal-related electrocatalysts for Li–CO2batteries: an overview of the fundamentals to explore future-oriented strategies

“…[49][50][51][52][53][54] As one of the noble metals, Ru has been widely utilized in the catalysis of methanol carbonylation, olen metathesis, and other reactions. [55][56][57][58] Therefore, Ru has a broad prospect to be applied to the reversible reaction process of CO 2 . [59][60][61][62][63][64][65] Based on this, Chen et al 59 synthesized Ru nanoparticles and immobilized them on carbon nanotubes as cathode catalysts for Li-CO 2 batteries.…”