Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

KINETICS OF CO OXIDATION OVER Co-ZSM-5 ANDCo-Pd-ZSM-5 CATALYSTSV.K. Yatsimirsky, L.P. Oleksenko, L.V. LutsenkoPP-I-30National Taras Shevchenko University of Kyiv, 64 Volodymyrska Str., Kiev-33, Ukraine01033; fax: +38044(2393358); e-mail: larisa_lutsenko@ukr.netMetal-containing zeolites, in particular on the base of ZSM-5, are studied as catalysts of anumber of redox procecces [1, 2], therefore a research of their mechanism is very interesting.The kinetic regularities of carbon monoxide oxidation on Co-(Pd-)containing zeolite ZSM-5are investigated in this paper. The kinetics of CO oxidation over active low-loaded metalcatalysts – 1.2%Co-ZSM-5 and 0.8%Со-0.5%Pd-ZSM-5 – is observed.The catalyst 1.2%Co-ZSM-5 is obtained via impregnation of the zeolite with Co(NO 3 ) 2solution, and 0.8%Co-0.5%Pd-ZSM-5 – with [Pd(NH 3 )]Cl 2 solution and then with Со(NO 3 ) 2 ;dried samples are treated in hydrogen at 350 °C during 1 hr. Before kinetic experiments thesamples are treated at 100 – 110 °C in reaction gaseous mixture (1%CO+10%O 2 +89%He)during 1 hr for a stationary state to be established. The kinetics of carbon monoxide oxidationis studied in a non-gradient reactor of flowing type equipped by reciprocating-engine in thetemperature interval 110 – 165 °C. Concentration of carbon monoxide is changed from 0.25to 2vol.% at constant initial concentration of oxygen 20vol.% (C O2 =8,93·10 –3 mole/l); oxygenconcentration is changed from 5 to 25vol.% at constant initial concentration of CO 1vol.%(C CO =4,46·10 –4 mole/l).r·10 8 , mole CO 2/g·s40302010a4321r·10 8 , mole CO 2/g·s302010b43210 2 4 6 8 10c CO·10 4 , mole/l00 2 4 6 8 10 12c O2·10 3 , mole/lFig. Dependences of the reaction rate a) on concentration CO and b) on concentration O 2 for the catalyst1.2%Co-ZSM-5: 1 – 110°С; 2 – 130°С; 3 – 150°С; 4 – 165°С.The investigation of the CO oxidation kinetics showes that the dependencies of thereaction rate on concentration of reagents for both the catalysts at 110, 130 and 150 °C and at165 °C for the Co-ZSM-5 have a view of curves with «saturation» which coincide with each265