Propene adsorption isotherms

Isotherms for propene adsorption on NiO, vanadium pentoxide, and cuprous oxide at 100° are shown in Fig. 2. All isotherms are described by Freundlich s equation and correspond to a heterogeneous surface with exponential distribution as to heats of adsorption. 

We describe proeedures, based on the slit pore model and Monte Carlo simulation, for predicting the adsorption of pure gases in active carbons given only a single carbon dioxide probe adsorption isotherm. Predictions are made at ambient temperature up to quite high pressure for methane, ethene, ethane, propene and propane. The key development in our work concerns our method for calibrating gas - surface interactions, i.e. we calibrate these interactions to a reference active carbon rather than a low surface area carbon as in most other work of this type. Our predictions highlight limitations in our surface model and experiments. 

A Micromeritics ASAP 2010 gas adsorption analyser (stainless steel version) was used to measure the adsorption isotherms of ethane, ethene, propane, propene, -butane, and isobutane on Kureha carbon in the pressure range from 0.002 to 120 kPa. The instrument was equipped with a turbomolecular vacuum pump and three different pressure transducers (0.13, 1.33, and 133 kPa, respectively) to enhance the sensitivity in different pressure ranges. The static-volumetric technique was used to determine the volume of the gas adsorbed at different... 

Figure 6 Single component gas adsorption isotherms for (a) methane, ethane, ethylene, and acetylene and (b) propane and propene at 318 K in Fe2(dobdc). The filled and open circles represent adsorption and desorption data, respectively, (c) and (d) represent experimental breakthrough curves for the adsorption of equimolar ethane/ethylene and propane/propylene mixtures. (Reproduced with permission from Ref 50. Copyright 2012 American Association of Advancement of Science.)...

The sample cell was loaded with 155.7 mg of Kureha carbon particles. Prior to the adsorption measurements the adsorbent particles were outgassed in situ in vacuum at 623 K for 16 h to remove any adsorbed impurities. The obtained dry sample weight was used in the calculation of isotherm data. Adsorption measurements were subsequently done at different temperatures from 194 to 338 K for ethane and ethene, from 273 to 358 K for propane and propene, and from 298 to 393 K for butane isomers. Five different temperatures for the adsorption of each adsorptive were used to reduce the uncertainty in the derived adsorption parameters. 

Figure 19. Low temperature nitrogen adsorption-desorption isotherms for Copolymer 1 sample (a) virgin (b) conditioned in propene at 298K and 0.15 MPa for 20 hours (c) conditioned in propene at 298K and 0.8 MPa for 14 hours (d) annealed in vacuum at 373K for 36 hours...

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