Cracking reactions nitrogen contents

The deactivation of a lanthanum exchanged zeolite Y catalyst for isopropyl benzene (cumene) cracking was studied using a thermobalance. The kinetics of the main reaction and the coking reaction were determined. The effects of catalyst coke content and poisoning by nitrogen compounds, quinoline, pyridine, and aniline, were evaluated. The Froment-Bischoff approach to modeling catalyst deactivation was used. 

Upon completion of the desired reaction the flame-sealed NMR tube is placed in the apparatus shown in Figure 2. The NMR tube must be scored and the score aligned with the stopcock A to insure a clean break of the tube (See Figure 2). The setup is then evacuated on a vacuum line while the contents of the NMR tube are cooled with liquid nitrogen (the tube is cooled to prevent rapid escape of the volatile materials upon exposure to the vacuum). Once evacuation of the apparatus is complete, stopcock B is closed and the sealed NMR tube is cracked by turning... 

Red-fuming Nitric Acid or Nitrogen Tetroxide stress corrosion cracking and/or pyrophoric reaction all Dependent on water and/or oxygen content. 

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