Ethylene is one of the most important basic chemicals in the modern chemical industry. Thermal or catalytic cracking of hydrocarbons is the main industrial technologies nowadays

which suffer from equilibriumlimitation and rapid coke formation. The oxidative dehydrogenation of ethane (ODHE) is considered to be a promising alternative process since it overcomes equilibrium-limitations

avoids catalyst deactivation by coke formation

and decreases the number of side reactions. In this study

particle-resolved 2D CFD simulations of fixed-beds filled with eggshell catalysts coupled with micro-kinetics of Pt-catalyzed ODHE were performed to understand the effect of operation conditions and catalyst properties on ethylene selectivity. The catalyst bed was created by discrete element method (DEM) and the central longitudinal section of the reactor tube was defined as the 2D simulation region. Both of the homogeneous and catalytic heterogeneous chemical reactions were described by detailed micro-kinetics within the particle-resolved CFD simulation. At first

the established model of monolith reactors was verified by comparing the simulated results with

experimental results reported in literature. Then

the effects of operation conditions and catalyst concentration on the ethylene selectivity in randomly packed beds were explored. The specific variation of certain operation conditions including inlet flow rate

inlet temperature

pressure

inlet C

2

H

6

/O

2

ratio and N

2

dilution ratio can effectively increase ethylene selectivity. And the reduction of ratio of catalytic active area to geometric area

F

cat/geo

representing catalyst properties from 140 to 30 increases the selectivity from 42.2% to 59.3%. This research can provide reference for the industrialization of ODHE process in the future.