The mass spectrometer is used to determine the composition of a sample and follow the evolution of changes in the gas phase composition during the SWNT synthesis. Gases from a reactor are pushed through the lines of the mass spectrometer to an ion source. From there, a mass analyzer determines the molecular weight of the compound. This information can be very important in determining a mechanism for a reaction.
Tacking hydrophobic organosilyl groups onto the surface of a common zeolite helps overcome the catalyst’s inability to function effectively when liquid water is the reaction medium, chemical engineers have found. The researchers believe their water-repelling zeolite could be a hit for high-pressure water/oil emulsion processing of biomass into fuels and chemicals. The protecting group strategy could also benefit other types of catalysts that are inhibited by water, they say.