Carbon dioxide could be a useful alternative source of carbon for the chemical industry. It is inexpensive, is supplied in abundance by nature, and would help to reduce the consumption of fossil fuels.
In addition, it would significantly improve the carbon footprint of fuels and chemical products. The largest barrier to this process is the high stability of the carbon dioxide molecule. In the journal Angewandte Chemie, Spanish researchers have now introduced a new process that traps carbon dioxide in the form of silyl formates, which are silicon-containing formic acid esters.
The hydrogenation of CO2 to formic acid (HCO2H) is an area of CO2 extraction that is being intensively researched. In the chemical industry, formic acid is used as a starting material for many products, with applications including agriculture, food technology, and the leather goods industry. Most interestingly, it could be used as a hydrogen-storage medium for fuel-cell-driven vehicles.
Although a number of catalytic processes for the production of formic acid from CO2 have been developed, none of them have been implemented industrially. The reaction is an equilibrium that significantly favors the reactants. In order to hinder the constantly running reverse reaction, the formic acid must be trapped—in the form of salts, adducts, or derivatives—in order to remove it from the equilibrium.
A team led by Francisco J. Fernández-Alvarez and Luis A. Oro at the University of Zaragoza has now developed a new catalyst that allows carbon dioxide to be converted and trapped as a silyl formate. These compounds can be used for the production of silicone polymers and as reactive intermediates in organic syntheses. It is also easily possible to release formic acid from the silyl formate.
The new reaction, which the researchers have been able to carry out on a gram scale, occurs under very mild reaction conditions. It is highly selective and delivers a high turnover, works without a solvent and produces no waste products. The carbon dioxide is reduced by heptamethyltrisiloxane. At the heart of the reaction lies a specially developed iridium catalyst that is formed in situ from an air- and water-stable precursor.
Author: Luis A. Oro, Universidad de Zaragoza (Spain), http://sorores.unizar.es/personales/LAO/oro.htmlTitle: Effective Fixation of CO2 by Iridium-Catalyzed Hydrosilylation
Angewandte Chemie | Angewandte Chemie
Exploring how herpes simplex virus changes when passed between family members
23.10.2017 | Penn State
Key discoveries offer significant hope of reversing antibiotic resistance
23.10.2017 | University of Bristol
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
23.10.2017 | Event News
17.10.2017 | Event News
10.10.2017 | Event News
23.10.2017 | Life Sciences
23.10.2017 | Automotive Engineering
23.10.2017 | Event News