Journal Title
Title of Journal: Top Catal
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Abbravation: Topics in Catalysis
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Authors: G Mestl D Lesser T Turek
Publish Date: 2016/08/01
Volume: 59, Issue: 17-18, Pages: 1533-1544
Abstract
A scheme is proposed for the dynamic catalytically active vanadiumphosphorusmixed oxide surface of industrially used catalysts for the selective oxidation of nbutane to maleic anhydride Surface species interconvert as function of operation conditions which leads to dynamic changes of the reactor performance on the time scale of hours to days if not controlled properly This scheme is used as basis for a twodimensional heterogeneous reactor model describing the observed performance changes as function of the underlying phosphorus surface dynamics The dynamic model comprises two reversible reactions slow phosphorus adsorption and water adsorption reaching its equilibrium faster The formation rate of catalytically active species on the surface of vanadyl pyrophosphate is proportional to the actual number of inactive surface sites and the surface concentration of water being in agreement with literature mechanisms according to which water drives the vanadyl pyrophosphate system into a twodimensional surface state facilitating the mobility of the three oxygen atoms necessary for the conversion of nbutane to MA This activation process on the other hand is inhibited by a surplus of surface phosphorus increasingly destroying/blocking the sites The kinetic model distinguishes explicitly between the intrinsic kinetics and phosphorus/water induced activity dynamics In the presented study all phosphorus and water related processes appeared to be completely reversible and the developed reactor model fully describes dynamic performance changes up to 400 h on stream Irreversible longterm changes of catalyst performance induced by eg bulk diffusion of phosphorus or crystalline phase transitions are not included in the model and hence need future investigation
Keywords:
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- Acrylonitrile from Biomass: Still Far from Being a Sustainable Process
- Gold Nanoparticles on Yttrium Modified Titania: Support Properties and Catalytic Activity
- Characterization and Activity of Pd–Ir Catalysts in CO and C 3 H 6 Oxidation Under Stoichiometric Conditions
- Nano Design of Alumina Supported Monometallic Catalysts: A Promising Way to Improve the Selective Hydrogenation of Poly-Unsaturated Hydrocarbons
- Selective Nanocatalysis of Organic Transformation by Metals: Concepts, Model Systems, and Instruments
- New Insights on Kinetic Versus Thermodynamic Ratios in Catalyzed Alkene Isomerization
- Insights into the Reactivity of Thiophene: Heterogeneous Alkylation
- Hydrogenation of the Aromatics and Olefins in FCC Gasoline During Deep Desulphurisation
- Effect of Ce Doping on the Performance and Stability of Strontium Cobalt Ferrite Perovskites as SOFC Anode Catalysts
- Synthesis and Photocatalytic Activity of Titania-Loaded Transition Metal-Modified MCM-41 Molecular Sieves
- Nanoscale Optimization and Statistical Modeling of Photoelectrochemical Water Splitting Efficiency of N-Doped TiO 2 Nanotubes
- Enhanced Stability of Fe 2 O 3 -Doped FeVO 4 /TiO 2 –WO 3 –SiO 2 SCR Catalysts
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- The 16th International Symposium on Relations Between Homogeneous and Heterogeneous Catalysis (ISHHC-16), Sapporo, August 4–9, 2013
- The Catalyst Selectivity Index (CSI): A Framework and Metric to Assess the Impact of Catalyst Efficiency Enhancements upon Energy and CO 2 Footprints
- Deactivation of Diesel Oxidation Catalysts by Sulphur in Laboratory and Engine-Bench Scale Aging
- Fe-ZSM-5 Catalyst Prepared by Ion Exchange from Fe(acac) 3 : Application into NH 3 -SCR of NO
- Ethanol Reforming Reactions Over Co and Cu Based Catalysts Obtained from LaCoCuO 3 Perovskite-Type Oxides
- Higher Alcohol Synthesis Using K-Doped CoRhMoS 2 /MWCNT Catalysts: Influence of Pelletization, Particle Size and Incorporation of Binders
- Selective Hydrogenation of 4-Nitrobenzaldehyde to 4-Aminobenzaldehyde by Colloidal RhCu Bimetallic Nanoparticles
- Etherification of 5-Hydroxymethylfurfural to a Biodiesel Component Over Ionic Liquid Modified Zeolites
- Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH 3 -SCR Applications
- Evidence for Diffusion-Controlled Hydrocarbon Selectivities in the Fischer–Tropsch Synthesis Over Cobalt Supported on Ordered Mesoporous Silica
- CO Dissociation at Vacancy Sites on Hägg Iron Carbide: Direct Versus Hydrogen-Assisted Routes Investigated with DFT
- Some Attempts in the Rational Design of Heterogeneous Catalysts Using Density Functional Theory Calculations
- Effect of Ag, Cu, and Au Incorporation on the Diesel Soot Oxidation Behavior of SiO 2 : Role of Metallic Ag
- The Denitridation of Nitrides of Iron, Cobalt and Rhenium Under Hydrogen
- The Selective Oxidation of Methanol on Iron Molybdate Catalysts
- Solar Thermal Hydrogen Production from Water over Modified CeO 2 Materials
- Engineered CNT Support for Selective Hydrogenation Reactions
- The Electronic Structure of Saturated NaCl and NaI Solutions in Contact with a Gold Substrate
- Cellulase Immobilized Nanostructured Supports for Efficient Saccharification of Cellulosic Substrates
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