1932-50-9Relevant articles and documents
Hydroxide Based Integrated CO2 Capture from Air and Conversion to Methanol
Sen, Raktim,Goeppert, Alain,Kar, Sayan,Prakash, G. K. Surya
, p. 4544 - 4549 (2020)
The first example of an alkali hydroxide-based system for CO2 capture and conversion to methanol has been established. Bicarbonate and formate salts were hydrogenated to methanol with high yields in a solution of ethylene glycol. In an integrated one-pot system, CO2 was efficiently captured by an ethylene glycol solution of the base and subsequently hydrogenated to CH3OH at relatively mild temperatures (100-140 °C) using Ru-PNP catalysts. The produced methanol can be easily separated by distillation. Hydroxide base regeneration at low temperatures was observed for the first time. Finally, CO2 capture from ambient air and hydrogenation to CH3OH was demonstrated. We postulate that the high capture efficiency and stability of hydroxide bases make them superior to existing amine-based routes for direct air capture and conversion to methanol in a scalable process.
Homogeneous Reforming of Aqueous Ethylene Glycol to Glycolic Acid and Pure Hydrogen Catalyzed by Pincer-Ruthenium Complexes Capable of Metal–Ligand Cooperation
Zou, You-Quan,von Wolff, Niklas,Rauch, Michael,Feller, Moran,Zhou, Quan-Quan,Anaby, Aviel,Diskin-Posner, Yael,Shimon, Linda J. W.,Avram, Liat,Ben-David, Yehoshoa,Milstein, David
supporting information, p. 4715 - 4722 (2021/02/20)
Glycolic acid is a useful and important α-hydroxy acid that has broad applications. Herein, the homogeneous ruthenium catalyzed reforming of aqueous ethylene glycol to generate glycolic acid as well as pure hydrogen gas, without concomitant CO2 emission, is reported. This approach provides a clean and sustainable direction to glycolic acid and hydrogen, based on inexpensive, readily available, and renewable ethylene glycol using 0.5 mol % of catalyst. In-depth mechanistic experimental and computational studies highlight key aspects of the PNNH-ligand framework involved in this transformation.
Applications of real-time FTIR spectroscopy to the elucidation of complex electroorganic pathways: electrooxidation of ethylene glycol on gold, platinum, and nickel in alkaline solution
Chang, Si-Chung,Ho, Yeunghaw,Weaver, Michael J.
, p. 9506 - 9513 (2007/10/02)
The electrooxidation pathways of ethylene glycol in alkaline aqueous solution on gold, platinum, and nickel electrodes are explored by means of real-time FTIR spectroscopy in conjunction with cyclic voltammetry. The former enables a quantitative assay of specific intermediates and products formed during the reaction evolution. The electrooxidation on gold features the successive formation of partially oxidized C2 solution species en route to oxalate and carbonate production. The latter species is produced predominantly via the formation of the dialdehyde, glyoxal, based on comparisons with electrooxidative spectral sequences for candidate intermediate species. In contrast, ethylene glycol electrooxidation on platinum exhibits markedly different kinetics and product distributions to those for the partially oxidized C2 species, inferring that at least carbonate production from ethylene glycol occurs largely through sequences of chemisorbed, rather than solution-phase, intermediates. Electrooxidation of ethylene glycol and higher polyols on nickel display a remarkably selective production of formate. This efficient oxidative C-C bond cleavage on nickel is displayed in somewhat different fashion for partially oxidized C2 reactants in that carbonate is predominantly formed. Some possible surface chemical factors responsible for these striking mechanistic differences are discussed.
