The Effect of Sn Content in a Pt/KIT-6 Catalyst Over its Performance in the Dehydrogenation of Propane
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Alejandro Mata-Martinez
Abstract
Propylene is one of the most important commodity chemicals. Its future demand is expected to exceed its production. Alternative routes to obtain this product need to be implemented. Dehydrogenation of propane assisted with catalyst is a promising route to meet demands. The Pt and Cr supported catalysts are amongst the most effective possibilities. However, Pt catalysts are preferred over Cr due to the toxic nature of Cr species. Despite the high performance of the Pt catalysts, they deactivate during reaction, mainly due to coke deposits blocking the active site and/or pores. This effect can be reduced with a support having high connectivity and surface area, like KIT-6. In this work the mesoporous silica KIT-6 was employed as support in a series of Pt-Sn catalysts. The influence of adding or increasing the weight % of Sn to Pt catalyst was studied. There were species of SnO2 and metallic Pt in the fresh catalysts. After reaction, it was found that in the catalysts with the lowest wt % of Sn (0.5), there were metallic Pt and a Pt-Sn alloy. In the rest of the used catalysts (containing 1.0, 1.5 and 2.0 wt % of Sn) the only detected specie was the Pt-Sn alloy. In the two most active catalysts (having 0.5 and 1.5 wt % of Sn), it was observed a difference of three times the quantity of coke deposited on the surface. The catalysts containing the highest coke deposits maintained its activity due to the high connectivity of the support.
Acknowledgements
Authors would like to thank to the Mexican National Council for Science and Technology (CONACyT) for the support of the project CB-2015-01 # 256268 and the Autonomous University of Sinaloa (UAS) with the project (PROFAPI-2015/251).
Appendix
The results of the nitrogen adsorption-desorption isotherms of KIT-6 can be seen in the Figure 6. The isotherm is type IV with a specific surface area, pore volume and pore diameter of 809 m2/g, 0.93 cm3/g and 45.8 Å, respectively. These values are in agreement with those reported in the literature for similar samples (Kleitz, Choi, and Ryoo 2003; Kleitz et al. 2010).
Nitrogen adsorption-desorption isotherms of KIT-6.
The XRD analyses for the KIT-6 support are given in Figure 7. The low-angle diffraction pattern shows evidence of two reflections at 2 Teta values of 0.94° and 1.72° corresponding to the interplanar spacing (211) and (420), respectively (Kleitz, Choi, and Ryoo 2003; Kleitz et al. 2010).
Low-angle XRD analyses of KIT-6.
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Artikel in diesem Heft
- Preface to the Special Issue Dedicated to the International Energy Conference, IEC 2017: Energy and its Development in the Twenty-First Century: A globalized vision
- Parametric Mathematical Modelling of Cristal Violet Dye Electrochemical Oxidation Using a Flow Electrochemical Reactor with BDD and DSA Anodes in Sulfate Media
- Photocatalytic Degradation of Caffeine in a Solar Reactor System
- Effect of Biomass Concentration on Oxygen Mass Transfer, Power Consumption, Interfacial Tension and Hydrodynamics in a Multiphase Partitioning Bioreactor
- Modeling and Hydraulic Characterization of a Filter-Press-Type Electrochemical Reactor by Using Residence Time Distribution Analysis and Hydraulic Indices
- Waste-to-energy: Coupling Waste Treatment to Highly Efficient CHP
- The Effect of Sn Content in a Pt/KIT-6 Catalyst Over its Performance in the Dehydrogenation of Propane
- Dehydrogenation of Propane to Propylene with Highly Stable Catalysts of Pt-Sn Supported Over Mesoporous Silica KIT-6
- Simultaneous Diesel and Oxygen Transfer Rate on the Production of an Oil-degrading Consortium in an Airlift Bioreactor: High-dispersed Phase Concentration
- Green Practices with Renewable Distributed Generation Technology in India
- Carcinogenic Hydrocarbon Pollution in Quintana Roo’s Sinkholes: Biotechnology for Remediation and Social Participation for Prevention
