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Destructive tests of the catalyst was carried out to study the effect of temperature on thecatalytic activity of CO coupling to diethyl oxalate (DEO) over a Pd-Fe/Al_2O_3 catalyst. It was found thata temperature jump could cause the deactivation of the Pd-Fe/α-Al_2O_3 catalyst. The catalyst deactivatedat different temperatures has different characteristics. After deactivation the crystal structure of α-Al_2O_3did 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 itsoriginal activity could not be recovered completely.
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 / Al 2 O 3 catalyst. It was found thata temperature jump could cause the deactivation of the Pd-Fe / α-Al_2O_3 catalyst. After deactivation of the crystal structure of α-Al_2O_3did 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.