Sentences with phrase «anti-markovnikov oxidation catalysts»

The first is the more challenging of the two reactions, which is why research puts so much effort into the development of efficient and sustainable water oxidation catalysts.

Materials Engineering Assistant Professor Thomas Manz (left) and Bo Yang, a Ph.D. student, have developed a new more - efficient selective oxidation catalyst after nearly four years and more than one million computational hours.

Since August 2012, Thomas Manz, Chemical and Materials Engineering assistant professor at New Mexico State University, and Ph.D. student Bo Yang have worked to develop a new more - efficient selective oxidation catalyst.

Steam treatment at 750 °C transforms single Pt2 + ions on CeO2 into a CO oxidation catalyst active at low temperatures.

«Proton Delivery and Removal in [Ni (PR2NR ′ 2) 2] 2 + Hydrogen Production and Oxidation Catalysts.»

Crystalline Transition Metal Antimonates as Earth - Abundant Water Oxidation Catalysts in 1.0 M Acid Ivan Moreno - Hernandez, Clara A. MacFarland, Carlos G. Read, Kimberly M. Papadantonakis, Bruce S. Brunschwig, Nathan S. Lewis

The team now reports using directed evolution, an iterative process of protein mutation and screening for activity, to identify amino acid substitutions that convert an enzyme into a predominantly anti-Markovnikov alkene oxidation catalyst (Science 2017, DOI: 10.1126 / science.aao1482).

There are two types of catalyst in your car, reduction and oxidation catalysts.

The hydrocarbons evaporate from the fuel and oxygen acts as an oxidation catalyst changing the remaining components into other compounds leaving varnish in their wake.

To make the diesel clean enough for North America, the 335d's exhaust requires an oxidation catalyst, a diesel particulate filter, a urea dosing module, and a selective catalytic reduction catalyst.

The diesel particulates filter and the oxidation catalyst are housed in the same unit positioned directly behind the engine.

In an effort to comply with U.S. emissions standards (Tier 2 Bin 5 emission regulations), the diesel relies on a new catalytic converter system that utilizes diesel oxidation catalyst (DOC), NOx trap catalyst (NTC) and diesel particulate filter (DPF) technologies.

With BluePerformance technology, the diesel particulates filter and the oxidation catalyst housed in the same unit interact with an NOx storage catalyst for further reduction of NOx in the exhaust gas.

On the BMW 730d with BMW BluePerformance the diesel particulates filter and the oxidation catalyst likewise featured as standard are supplemented by an NOx storage catalyst.

The new powertrain is designed to meet strict future emissions requirements through the use of an innovative oxidation catalyst / NOx adsorber coupled with Selective Catalytic Reduction (SCR).

Equipped with a diesel oxidation catalyst, diesel particulate filter, and selective catalytic reduction, it will be emissions - compliant in all 50 states.

With introduction and optimization of exhaust gas aftertreatment systems, such as the diesel oxidation catalyst and the diesel particulate trap, as well as NOx - reduction systems, pollutant emissions have been significantly decreased.

Today, sulfur poisoning of diesel oxidation catalysts is no longer considered a problem due to the low - sulfur fuel used in Europe.

One locomotive in this series of 25 will be based in Roseville to test the combined use of exhaust gas recirculation (EGR), diesel oxidation catalyst, and diesel particulate filtering.

Not exact matches

White's group is working on catalysts that can modify a wider range of amino acids, particularly those with electron - rich aromatic functionality, which compete with the carbon - hydrogen bonds for oxidation using the current catalyst.

The process relies on inexpensive titania as a catalyst and avoids the side production of cyanide that accompanies propylene oxidation.

To demonstrate one potential use of the nanoparticles, the research team used them as advanced catalysts for ammonia oxidation, which is a key step in the production of nitric acid (a liquid acid that is used in the production of ammonium nitrate for fertilizers, making plastics, and in the manufacturing of dyes).

They were able to achieve 100 percent oxidation of ammonia and 99 percent selectivity toward desired products with the high entropy alloy nanoparticles, proving their ability as highly efficient catalysts.

«Someone will also need to determine exactly how Nocera's catalyst is driving the water oxidation reaction,» says Eisenberg, noting that achieving the first reaction alone is «an excellent development on a very difficult and keenly important problem.»

«While this catalyst combination has been used previously in aerobic oxidations, we didn't know if it would be a good fuel cell catalyst,» Stahl says.

By oxidation or reduction, i.e. the donation or acceptance of electrons, the catalysts convert combustion pollutants, such as carbon monoxide, nitrogen oxides and hydrocarbons, into carbon dioxide, water, and nitrogen.

During the experiments and computational study, the researchers looked at how water, surface hydroxyls and the metal - support interface interacted during carbon monoxide oxidation over a gold - titania catalyst.

This image shows schematic representation of the lowest energy pathway for CO oxidation on gold - titania catalysts.

«If we can put these H2O2 formation catalysts very close to something which performs the oxidation reaction, we can avoid the entire problem or concentrating and transporting hydrogen peroxide.»

«By stabilizing the energy of oxygen atoms and electrons, the catalyst lowers the energy cost of selective oxidation reactions just like a bank facilitates the sale of a car from one person to another.

Wang's research group designed a five - metal catalyst based on these high - entropy - alloy nanoparticles and demonstrated superior catalytic performance for selective oxidation of ammonia to nitrogen oxide, a reaction used by the chemical industry to produce nitric acid, an important chemical in the large - scale production of fertilizers and other products.

As a catalyst, the ferrous iron should remain chemically unchanged at the end of the oxidation reaction.

In other homogeneous (or heterogeneous) catalyst systems in which the metal is likely to be in a relatively high oxidation state, such as molybdenum (VI) or tungsten (VI), metal - carbon multiple bonds may play an important role.

In studies with simulated vehicle exhaust, this catalyst treatment also improves its oxidation activity for other exhaust components such as hydrocarbons.

Nie et al. show that a thermally stable catalyst, atomically dispersed Pt2 + on CeO2, can become active for CO oxidation at 150 °C after steam treatment at 750 °C.

Bio-inspired catalyst A research team combining the expertise of Moniek Tromp (UvA / HIMS), Evgeny Pidko and Emiel Hensen (Eindhoven University of Technology), Maricruz Sanches - Sanches (Technische Universität München) as well as Johannes Lercher (Technische Universität München and Pacific Northwest National Laboratory) is currently focusing on a bio-inspired method enabling such partial methane oxidation.

Decoupling Hydrogen Production and Water Oxidation in a Hybrid Solar - Driven Vanadium Redox Cell Supported By a Bipolar Membrane with Earth - Abundant Catalysts Chengxiang Xiang

The same catalyst they developed to split carbon dioxide also appeared to work for the oxidation of water, which is necessary to complete the reduction.

The team continues to uncover the basic design principles for catalysts capable of hydrogen oxidation and hydrogen production.

Some of the most fascinating catalysts in nature display complex inorganic cofactors and perform chemical transformations (water reduction and oxidation, carbon dioxide reduction, dinitrogen reduction, dioxygen reduction) that are arguably prerequisites for the advance of society in the current context of limiting energy resources and environmental concerns.

The article «Pinpointing Intermediates,» identifies the key geometries and oxidation states in catalysts for NOx cleanup, and shows the connection to enzyme catalysis.

The scientists correlated the various peaks observed in the NMR spectra with the catalysts» reactivity for an oxidation reaction that removes a hydrogen atom from methanol.

Catalysts exist that can perform the tricky anti-Markovnikov oxidations, but they are very unproductive and are not enantioselective.

One hurdle for C — H functionalization has been that it's a two - electron oxidation process, but inexpensive first - row transition metals used as catalysts typically are capable of one - electron redox activity.

The researchers are studying how removal of an electron (oxidation) affects the bonding and reactivity of metal hydrides and related complexes that can be used as molecular catalysts.

With this knowledge, we can devise and design improvements on the cobalt oxide catalyst and its support environment to partially or completely remove these bottlenecks and improve the efficiency of water oxidation.»

The first direct, temporally resolved observations of intermediate steps in water oxidation using cobalt oxide, an Earth - abundant solid catalyst, revealed kinetic bottlenecks whose elimination would help boost the efficiency of artificial photosynthesis systems.

Frei, Zhang and de Respinis have reported their findings in the journal Nature Chemistry in a paper titled «Time - resolved observations of water oxidation intermediates on a cobalt oxide nanoparticle catalyst.»

«We've obtained the first direct, temporally resolved observation of two intermediate steps in water oxidation using an Earth - abundant solid catalyst, cobalt oxide, that allowed us to identify the kinetic bottlenecks.

Guaiacol and glyoxilic acid enter condensation, its product enters extraction, its byproduct enters guaiacol recycle and its product enters oxidation with a catalyst, its product enters decarboxylation, its product enters extraction, its product enters distillation, its product enters crystallization, its product enters drying, its product enters metal detection, and its product vanillin enters packing.