1 Extravasation can also be recognized more quickly when promethazine is diluted than if the drug is given in a smaller volume. 2  Administer the medication through large patent veins (i.e., preferably via a central venous access site, absolutely no hand or wrist veins). 3  Check the means of administration.
The element platinum can be used as a catalyst in some chemical reactions. allanswart/iStockphoto. Catalysts are the unsung heroes of the chemical reactions that make human society tick. A catalyst is some material that speeds up chemical reactions. With a helping hand from a catalyst, molecules that might take years to interact can now do so in seconds. Factories rely on catalysts to make everything from plastic to drugs. Catalysts help process petroleum and coal into liquid fuels. Theyâre key players in clean-energy technologies.
Â­The reduction catalyst is the first stage of the catalytic converter. It uses platinum and rhodium to help reduce the NOx emissions. When an NO or NO2 molecule contacts the catalyst, the catalyst rips the nitrogen atom out of the molecule and holds on to it, freeing the oxygen in the form of O2.or example: or. Ceramic honeycomb catalyst structure. The oxidation catalyst is the second stage of the catalytic converter. It reduces the unburned hydrocarbons and carbon monoxide by burning (oxidizing) them over a platinum and palladium catalyst.