III International Conference

PP-II-69THE EFFECT OF NOBLE METAL (Au, Ag, Ru) ADDITION ON PHYSICOCHEMICALPROPERTIES OF BI-OXIDE SUPPORTED (Ni Fe) CATALYSTS FOR PARTIALOXIDATION OF METHANE AND METHANOL SYNTHESISManiecki T.P., Bawolak K., Mierczyński P., Jóźwiak W.K.Institute of General and Ecological Chemistry, Technical University of Lodz,90-924 Lodz, ul. Zeromskiego 116, tel: +48 42 631 31 25 fax: 48 42 631 31 28, PolandE-mail: tmanieck@mail.p.lodz.plThis project examines the effect of binary support: MgAl 2 O 4 , FeAlO 3 , ZnAl 2 O 4 , Al 3 CrO 6 ,NiAl 2 O 4 and active phase: Au, Ag, Ru - Fe, Ni on physicochemical properties ofmetal/support catalysts and their activity in partial oxidation of methane and methanolsynthesis. The formation of spinel type structure in case of all binary supports was proved.The role of noble metal addition on the reducibility of mono- and bi-oxide phases wasestablished.This work is focused on the role of noble metal additives on the physiochemicalproperties and the activity of bimetallic catalysts Au, Ag, Ru - Fe, Ni supported on binaryoxide (MgAl 2 O 4 , FeAlO 3 , ZnAl 2 O 4 , Al 3 CrO 6 , NiAl 2 O 4 ) in partial oxidation of methane(POM) and methanol synthesis (MS). Supported bimetallic systems represent a considerablepart of heterogeneous catalysts, which have been used in various reactions important in thechemical, petrochemical and oil industry. In comparison to monometallic systems thebimetallic catalysts showed better activity and stability in hydrocarbon conversion. Theaddition of noble metal improves the bimetallic catalyst activity due to modification ofelectron properties. Further modifications of the oxide support change its morphological andtextural parameters.Catalyst preparation: The binary oxides were prepared by co-precipitation method. Asstarting compounds an aqueous solutions of nitrates of Mg, Cr, Al, Fe, Zn were used and theappropriate mixtures of hydroxides were co-precipitated with aqueous ammonia solution withsuitable molar ratio of Al/Mg=2, Al/Cr=3, Al/Fe=1, Al/Zn=2 and Al/Ni=2 . The samples weredried and calcined in air at 700°C for 4 hours. The active phase were deposited from solutionsof nitrates of Au, Ag, Ru, Fe, Ni by impregnation method. The load of metal was 5%(Ni, Fe)-2%(Au, Ag, Cu) respectively. The catalysts were characterized by TPR H2 , low-temperatureN 2 adsorption, and XRD methods. The catalytic activity measurements in POM and MSreactions were carried out in a flow quartz reactor systems with chromatographic analysis andunder pressure in HDT (Germany) reactor system coupled with the mass spectrometer.290