Model improvements related to the analysis of 1H NMR
signal intensity vs temperature (IT-curve) of a fluid
confined in porous materials are presented enabling pore size
distribution, specific surface area, and relative
distribution of pore volumes to be extracted. The model is applied
to four different porous materials, two
containing mesopores only and two containing both mesopores and
micropores.
The gas phase oxidative dehydrogenation of ethane (ODHE) has been investigated, both experimentally and through kinetic modeling and simulation, as a potential alternative to steam cracking for ethylene production. The experiments were carried out at isothermal conditions and atmospheric pressure by using a quartz tube flow reactor (2 mm i.d.) with a volume of 0.110 mL. A gas phase kinetic model with 134 elementary reaction steps and 25 species was adopted from the literature, and the parameters were adjusted by best fitting of the experimental data based on the sensitivity analysis of the kinetic model. Further, the model was reduced based on the contribution analysis and a kinetic model of 41 steps involving 23 gas phase species was established. The kinetic analysis of the gas phase ODHE reaction is performed by means of the established kinetic model to provide the reaction pathways for ethylene and other byproducts formation, providing a better understanding of the radical chemistry for limiting the ethylene selectivity. The reactor simulations are performed under different conditions such as C 2 H 6 /O 2 ratios and temperatures to search for the upper bound of the ethylene yield in the gas phase ODHE. An upper bound ethylene yield of 53.5% (C 2 H 4 selectivity, 65.4%) is predicted at 1173 K and C 2 H 6 /O 2 = 3.33 with a residence time of 0.1 s at atmospheric pressure.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.