Effect of Temperature on the Deactivation of a Pd-Fe／α-Al2O3 Catalyst for CO Coupling to Diethyl Oxalate

Destructive tests of the catalyst was carried out to study the effect of temperature on the catalytic activity of CO coupling to diethyl oxalate (DEO) over a Pd-Fe/Al2O3 catalyst. It was found that a temperature jump could cause the deactivation of the Pd-Fe/α-Al2O3 catalyst. The catalyst deactivated at different temperatures has different characteristics. After deactivation the crystal structure of α-Al2O3 did not change, but the Pd particle size was enlarged. Most of the Pd^0 were oxidized to Pd^2 . and Fe^2 was oxidized to Fe^3 on the surface of the deactivated catalyst. The catalyst could be regenerated, but its original activity could not be recovered completely.

Effect of Temperature on the Deactivation of a Pd-Fe/Al2O3 Catalyst for CO Coupling to Diethyl Oxalate

Destructive tests of the catalyst was carried out to study the effect of temperature on the catalytic activity of CO coupling to diethyl oxalate (DEO) over a Pd-Fe/Al2O3 catalyst. It was found that a temperature jump could cause the deactivation of the Pd-Fe/a-Al2O3 catalyst. The catalyst deactivated at different temperatures has different characteristics. After deactivation the crystal structure of a-Al2O3 did not change, but the Pd particle size was enlarged. Most of the Pd0 were oxidized to Pd2+, and Fe2+ was oxidized to Fe3+ on the surface of the deactivated catalyst. The catalyst could be regenerated, but its original activity could not be recovered completely.