Synthesis of higher carboxylic acids from ethers, CO2 and H2

Abstract

Synthesis of higher carboxylic acids using CO2 and H2 is of great importance, because CO2 is an attractive renewable C1 resource and H2 is a cheap and clean reductant. Herein we report a route to produce higher carboxylic acids via reaction of ethers with CO2 and H2. We show that the reaction can be efficiently catalyzed by an IrI4 catalyst with LiI as promoter at 170 °C, 5 MPa of CO2 and 2 MPa of H2. The catalytic system applies to various ether substrates. The mechanistic study indicates that the ethers are converted to olefins, which are further transformed into alkyl iodides. The higher carboxylic acids are produced by carbonylation of alkyl iodides with CO generated in situ via RWGS reaction. This report offers an alternative strategy of higher carboxylic acid synthesis and CO2 transformation.

Homogeneous (De)hydrogenative Catalysis for Circular Chemistry – Using Waste as a Resource

“…Soon after, the same group reported the synthesis of acetic acid from methanol with CO 2 and H 2 using a simpler system based on Rh 2 (CO) 4 Cl 2 precursor and 4‐methylimidazole (4‐MI) in the presence of LiCl and LiI at 150 °C [124] . Recently, the same group reported the synthesis of higher carboxylic acids from ethers using the IrI 4 catalyst with LiI as a promoter at 170 °C, 5 MPa of CO 2 , and 2 MPa of H 2 [125] . More detailed reviews on the topic of carbonylation of alkenes using CO 2 have been reported by Beller [126] and Zhang [127] recently.…”

Design and Analysis of Metal Oxides for CO2 Reduction Using Machine Learning, Transfer Learning, and Bayesian Optimization

“…However, high thermodynamic stability is an obstacle to the use of CO 2 , and therefore, hydrogen (H 2 ) is frequently used for CO 2 conversion because of its high energy content. CO 2 reacts with H 2 to form a wide variety of petrochemical-based materials, such as methane, 3 methanol, 4 carboxylic acids, 5 and carbon monoxide (CO). In this work, we focused on the process of manufacturing CO, which can be used for production of chemicals, such as acetic acid, or as a synthesis gas with hydrogen to produce methanol or dimethyl ether.…”

Low temperature methanation of CO2 over an amorphous cobalt-based catalyst

“…Chemical transformation of CO 2 into fuels or useful chemicals has attracted great attention all over the world. [1][2][3][4][5][6][7][8][9][10] Methane is one of the major energy sources in human life that can be easily fed into the existing infrastructures. In addition, methane is also a basic feedstock to produce other value added chemicals.…”