Nanocomposites and nanomaterials

Co-Fe nanocomposites deposited onto platinized alumina in the reaction of CO2 hydrogenation

A. Dyachenko1, E. Ishchenko1, T. Zakharova1, A. Yatsymyrskiy1, O. Mischanchuk2, R. Korzh3
1Taras Shevchenko National University of Kyiv, 64/13 Volodymyrs’ka str., Kyiv, Ukraine
E-mail: dyachenko.alla@yahoo.com
2O.O. Chuiko Institute of Surface Chemistry of NAS of Ukraine, 17 General Naumov str., Kyiv, Ukraine
3Institute of Bioorganic Chemistry and Petrochemistry of NAS of Ukraine, 1, Murmans’ka Str., Kyiv, Ukraine 
A few samples of alumina supported metal catalysts were tested in the reaction of CO2 hydrogenation. Applying of actives on the carrier’s surface was providing by impregnation with metal nitrate solution, further thermal degradation and reduction of metal oxide precursors by hydrogen. Catalytic activity of the samples in the reaction CO2+H2 is presented on the figure.
	Platinized aluminum oxide (0,7wt% Pt_γ-Al2O3) is used as a carrier for Co-Fe actives and does not exhibit activity in the process of converting carbon dioxide into methane. The application of 10 wt% of cobalt from a dilute nitrate solution to the surface of platinized alumina leads to increasing of catalyst efficiency (methane yield is 55%). For a Co-Fe-sample yield of methane reaches 100% at T = 350% C and atmospheric pressure.	
Fig. Methane yield for the sample: 
1- 0,7%Pt_γ-Al2O3 (Ssp = 200 m2/g); 
2 – 10wt% Co/0,7%Pt_γ-Al2O3 (Ssp=160 m2/g);
3-20wt%Co93Fe07/0,7%Pt_γ-Al2O3 (Ssp =160 m2/g) 		
The morphology of Co93Fe07/0,7%Pt_γ-Al2O3 catalyst’s surface is observed by scanning electron microscopy (SEM). The primary particle of actives has an elongated shape with length of 50-100 nm, which agglomerated up to 3 μm in the macropores of carrier. The formation of nanocomposites with defective surface structure causes the high catalytic activity of Co93Fe07/0,7%Pt_γ-Al2O3 in the reaction of CO2 hydrogenation.