Microkinetic modeling of ethylene oxidation over silver

Catalytic activity of ethylene oxidation over Au, Ag and Au–Ag catalysts: Support effect

Ethylene oxidation by Ag catalysts has been extensively investigated over the past few decades, but many key fundamental issues about this important catalytic system are still unresolved. This over...

Overview of Selective Oxidation of Ethylene to Ethylene Oxide by Ag Catalysts

Analysis and optimal design of an ethylene oxide reactor

Microreactors as tools in kinetic investigations: Ethylene oxide formation on silver catalyst

The kinetics of ethylene epoxidation network were studied experimentally over a cesium-doped silver catalyst supported on α-Al2O3 pellets in a differential reactor. A variety of rate functions were considered and among these, expressions based on a dual-site Langmuir−Hinselwood mechanism:  ri = kiPE /(1 +  PE)2, fitted the data best with an average error of 13.0 and 10.7% for the epoxidation and the complete combustion reactions, respectively. Under the experimental conditions, both reactants influence both reaction rates; however, product influence is negligible because of their small partial pressures present in the reactor. High oxygen/ethylene ratios and lower temperature favored selectivity to the epoxidation reaction. The kinetic parameters obtained from the differential reactor experiments were refined to match the fixed-bed reactor experiments. With this, the average error in predicting both ethylene conversion and selectivity to ethylene oxide was 4.3%. The apparent activation energies for the ep...

Christina M. Bondy

Papers

Ethylene Epoxidation on Ag-Cs/α-Al2O3 Catalyst: Experimental Results and Strategy for Kinetic Parameter Determination