Kinetic Simulation of Methacrolein and Lactone Production from the Catalytic Oxidation of Isobutane over Lanthanide Phosphomolybdates
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Shane M Kendell
Eight lanthanum- (La0.25H2.25[PMo12O40], La0.5H1.5[PMo12O40], La0.75H0.75[PMo12O40], La[PMo12O40]) and cerium- (Ce0.25H2.25[PMo12O40], Ce0.5H1.5[PMo12O40], Ce0.75H0.75[PMo 12O40], Ce[PMo12O40]) containing phosphomolybdate catalysts have been synthesized and analysed using a low pressure steady state technique. The products from isobutane oxidation using the catalysts were water, methacrolein, carbon dioxide and lactone. Methacrylic acid is not detected under the low-pressure molecular-flow conditions; lactone is postulated to be intermediary in methacrylic acid production. The methacrolein and lactone data were simulated using two different theoretical models in order to determine kinetic parameters. The activation barriers for methacrolein formation vary substantially throughout each lanthanum and cerium series, however the most active catalyst is determined to be Ce[PMo12O40]. Only three of the eight catalysts produced significant quantities of lactone (La0.75H0.75 [PMo12O40], La[PMo12O40] and Ce[PMo12O40]) and this activity is correlated with the most active catalysts for methacrolein formation. The trends in selective oxidation activity must be due to the acidity and redox properties, as well as the structural phases, but it is difficult to quantify in all cases.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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Artikel in diesem Heft
- Article
- Editorial: Special Issue Contributed from CHEMECA 2008-Mathematical Modeling
- Advanced Modelling for Investigating the Effects of Reactor Operation on Controlled Living Emulsion Polymerization
- Influence of Jet Velocity on Jet Breakup in Immiscible Liquid-Liquid Systems
- Computational Fluid Dynamics Study of New Vacuum Degassing Process
- Kinetic Simulation of Methacrolein and Lactone Production from the Catalytic Oxidation of Isobutane over Lanthanide Phosphomolybdates
- Operability Analysis of MTBE Reactive Distillation Column using a Process Simulator
- MIQP-Based MPC in the Presence of Control Valve Stiction
- A Theoretical Investigation into Phase Change Clothing Benefits for Firefighters under Extreme Conditions
- Travelling Waves in a Two-Step Chain Branching Model with Heat Loss
- Three-Dimensional Numerical Study on Flames
- 2D Computer Simulations of Ohmic Heating of Milk Solutions in Laminar Annular Flow
- Inhibition of Premixed Methane-Air Flames with CF3I
- Adaptive Supervisory Control of an Industrial Steel Slab Reheating Furnace
- Analysis of an Immoblised Enzyme Reactor with Catalysts Activation
