Catalysts for the gas-phase reduction of aromatic nitro compounds to aromatic amines are regenerated by treatment of the catalyst, at elevated temperature, with a gas mixture which contains oxygen, inorganic and/or organic amines and/or nitrogen oxides and, where appropiate, steam.Gunter Stammann...
Carbon dioxide is: a) an element. b) a mixture of carbon and oxygen. c) a compound. d) homogenous. Matter: Matter is anything that occupies space and has mass. Matter can be classified as pure substances or mixtures. The pure substances include the elements...
A nonmetallic element constituting 21 percent of the atmosphere by volume that occurs as a diatomic gas, O2, and in many compounds such as water and silica, and in iron ore. It combines with most elements, is essential for plant and animal respiration, and is required for nearly all combust...
Compound Is Canonicalized:True Exact Mass:-1.1 XLogP3-AA:31.989829239 Monoisotopic Mass:31.989829239 Complexity:0 Rotatable Bond Count:0 Hydrogen Bond Donor Count:0 Hydrogen Bond Acceptor Count:2 Topological Polar Surface Area:34.1 Heavy Atom Count::2 Defined Atom Stereocenter Count:0 Undefined Atom ...
Depending on both the material and the new environment, individual phase changes can occur throughout the entire membrane or they can be highly localized (e.g., only at a surface or as distributed pockets of a newly formed phase in an equilibrium mixture of phases) [35,42,49]. For a ...
In contrast, a step that is not rate determining generally involves a small pool of some compound that is rapidly converted from reactant to product; because the compound is converted to product as soon as it appears, there is no fractionation at this step. The isotopic compositions of react...
and metallic. Oxygen supports combustion, combines with most elements, and is a component of hundreds of thousands of organic compounds. Ozone (O3), a highly active compound with a name derived from the Greek word for 'I smell', is formed by the action of an electrical discharge or ultravio...
At the most basic level, special methods of synthesizing and altering this compound are used to add and subtract oxygens, which changes the valence state of copper so that different valence states are scattered through the material. Interestingly, the actual cause and mechanism of superconductivity ...
The exposed Fe3+ and Co2+ formed the intermetallic compound Co3Fe7. In addition, some Fe3+ formed Fe2N in the NH3 atmosphere. Due to the Kirkendall effect [51,52], the diffusion rates of Co3Fe7 and Fe2N are different, so the cavity is formed and the core-shell structure of Co3...
Oxygen in marine sediments regulates many key biogeochemical processes, playing a crucial role in shaping Earth’s climate and benthic ecosystems. In this context, branched glycerol dialkyl glycerol tetraethers (brGDGTs), essential biomarkers in paleoenv