Destructive tests of the catalyst was carried out to study the effect oftemperature on the catalytic activity of CO coupling to diethyl oxalate (DEO) over a Pd-Fe/Al_2O_3catalyst. It was found that a temperature jump ...Destructive tests of the catalyst was carried out to study the effect oftemperature on the catalytic activity of CO coupling to diethyl oxalate (DEO) over a Pd-Fe/Al_2O_3catalyst. It was found that a temperature jump could cause the deactivation of the Pd-Fe/α-Al_2O_3catalyst. The catalyst deactivated at different temperatures has different characteristics. Afterdeactivation the crystal structure of α-Al_2O_3 did not change, but the Pd particle size wasenlarged. Most of the Pd^0 were oxidized to Pd^(2+), and Fe^(2+) was oxidized to Fe^(3+) on thesurface of the deactivated catalyst. The catalyst could be regenerated, but its original activitycould not be recovered completely.展开更多
基金Supported by National"Ninth-Five" Scientific Research Project(Grant number:96-539-01)
文摘Destructive tests of the catalyst was carried out to study the effect oftemperature on the catalytic activity of CO coupling to diethyl oxalate (DEO) over a Pd-Fe/Al_2O_3catalyst. It was found that a temperature jump could cause the deactivation of the Pd-Fe/α-Al_2O_3catalyst. The catalyst deactivated at different temperatures has different characteristics. Afterdeactivation the crystal structure of α-Al_2O_3 did not change, but the Pd particle size wasenlarged. Most of the Pd^0 were oxidized to Pd^(2+), and Fe^(2+) was oxidized to Fe^(3+) on thesurface of the deactivated catalyst. The catalyst could be regenerated, but its original activitycould not be recovered completely.
