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Bayat M.,Amirkabir University of Technology | Sohrabi M.,Amirkabir University of Technology | Sohrabi M.,IR Iran Academy of science | Royaee S.J.,Amirkabir University of Technology | Royaee S.J.,Research Institute of Petroleum Industry RIPI
Journal of Industrial and Engineering Chemistry | Year: 2012

A novel heterogeneous catalyst for degradation of phenol has been synthesized. Dispersed metallic clusters of iron loaded on to clinoptilolite by impregnation method. Clinoptilolite belongs to the broad family of natural zeolites. The influences of pH, the mass ratio of iron to clinoptilolite, the ratio of hydrogen peroxide to phenol and catalyst loading on phenol degradation were investigated. An autocatalytic heterogeneous-homogeneous kinetic model was proposed for this reaction. Experiments were performed, using a stirred batch reactor under mild conditions with 100mgL -1 initial phenol concentration applying Fe/clinoptilolite as a catalyst and H 2O 2 as an oxidant. This new heterogeneous Fenton-like system resulted in a nearly total elimination of phenol and 70% COD removal during 30min. In order to examine the effect of run time on the activity and stability of the catalyst, the degradation reaction was carried out applying a continuous packed bed reactor. It was observed that during 30h time on stream no change in the activity of the catalyst or any structural deformation of the particles was occurred. A negligible release of iron from the catalyst during the reaction (6ppm) may be related to the appropriate stability of the latter. © 2012 The Korean Society of Industrial and Engineering Chemistry.

Ghasemi S.,Amirkabir University of Technology | Sohrabi M.,Amirkabir University of Technology | Sohrabi M.,Ir Iran Academy Of Science | Rahmani M.,Amirkabir University of Technology
Asia-Pacific Journal of Chemical Engineering | Year: 2010

Fischer-Tropsch synthesis (FTS) is an important chemical process for the production of liquid fuels. In the present study, a dynamic model for a commercial size slurry bubble column reactor (SBCR) operating under heterogeneous flow regime and dealing with the FTS has been developed. In such a model a detailed kinetics expressions for the FTS and water gas shift (WGS) reactions have been considered. A selectivity model combined with SBCR hydrodynamics and the multicomponent VLE scheme have been applied to estimate the distribution of olefins and paraffins in the products. In addition, the effects of catalyst deactivation on reactor performance and product distribution under transient conditions may be predicted from this model. The data calculated from the model have been correlated with the experimental results available in the literature. It seems that the present model could be applied to estimate the main characteristics of the reactor's dynamic behavior. © 2009 Curtin University of Technology and John Wiley & Sons, Ltd.

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