Advanced Computational and Experimental Chemistry Problem: Reaction Mechanism Analysis and Catalyst Optimization
Publicada el 2026-07-16
Descripción de la oferta
I am seeking an experienced chemist or chemical engineer to analyze a complex catalytic reaction system and propose improvements to reaction efficiency. The problem involves the selective oxidation of an organic substrate (R–CH₂–OH) to the corresponding aldehyde (R–CHO) using a heterogeneous metal catalyst. Current catalyst performance: Conversion: approximately 65% Selectivity: approximately 75% Catalyst activity decreases after repeated cycles Unwanted over-oxidation products (carboxylic acids) are formed Reaction conditions: Temperature: 120–180 °C Pressure: 5–20 bar oxygen atmosphere Solvent: water/organic co-solvent mixture Catalyst: supported transition metal nanoparticles (metal identity to be evaluated) Reaction time: 2–8 hours Required Tasks: Reaction Mechanism Analysis Develop a detailed reaction mechanism. Identify major reaction intermediates. Explain oxidation pathways. Determine possible rate-determining steps. Analyze adsorption and surface interaction effects. Kinetic Study Develop a suitable kinetic model. Propose a rate law. Analyze temperature effects using Arrhenius kinetics. Estimate activation energy from available or simulated experimental data. Thermodynamic Evaluation Calculate or estimate ΔG, ΔH, and ΔS changes. Determine whether competing side reactions are thermodynamically favorable. Explain equilibrium limitations. Catalyst Optimization Recommend improved catalyst compositions. Analyze metal-support interactions. Discuss nanoparticle size and morphology effects. Suggest methods to reduce catalyst deactivation and poisoning. Process Optimization Recommend optimal reaction conditions. Evaluate effects of temperature, pressure, solvent, oxygen concentration, and catalyst loading. Suggest an experimental design strategy (DOE). Computational Chemistry (Preferred) Perform DFT calculations or molecular simulations if possible. Compare reaction energy pathways. Calculate adsorption energies of key intermediates. Predict catalyst activity trends. Expected Deliverables: Detailed technical report (15–30 pages) Proposed reaction mechanism diagrams Kinetic model and analysis Thermodynamic evaluation Catalyst improvement strategy Literature review with peer-reviewed references Required Skills: Advanced chemistry knowledge Organic chemistry Heterogeneous catalysis Chemical kinetics Thermodynamics Computational chemistry (DFT preferred) Scientific literature analysis Experience Level: Advanced / PhD-level expertise preferred.
Skills
Fuente original: freelancer