Abstract
We prepared blend and pseudo-interpenetrating network (PIPN) membranes containing zeolite 13X with the dehydrogenation catalyst (Ti or Ni) and polyethylacrylate (PEA). Membranes were tested by a single cell reactor using the dehydrogenation reaction of cyclohexane to benzene at low temperatures (323–360 K). Proton nuclear magnetic resonance (NMR) was used to analyze the composition of the throughput and the feed in our experiments. Using 2 wt% of Ti or Ni on 40 wt% of zeolite with 60 wt% PEA the conversion ratio of benzene to cyclohexane was about 4–8%. The feed did not contain measurable amounts of benzene, hence the separation was complete. Scanning electron microscopy (SEM) results showed that the blend membrane developed cracks considerably earlier than the PIPN membrane. We also find the pseudo-first-order rate constant and its activation energy for the dehydrogenation reaction in the membrane by using a phenomenological diffusion–reaction model. The latter values are consistent with surface diffusion control of the kinetics.
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