Adsorption of CO O2 H2 He

Spectrum H shows the profile at 220 °C one band of gaseous CO and another band that is assigned to the CO adsorption on Pt atoms (2050 cm ), and the last one remaining constant. 

Part 2 TPSR of Propane Oxidation with CO2 on Ce, xFex02 s Mixed Oxides 

In the second part, we aim to study the temperature-programmed superficial reaction of propane oxidation with CO2 on a Cei Fe c02-a mixed oxide. This mixed oxide was prepared by the Pechini method as described in Ref. [27]. In short, solutions of 0.4 M Ce(N03)3-6 H2O, 0.1 M Fe(N03)2-9H20, and 0.5 M citric acid (CA) were mixed at room temperature. Then, the CA solution was added with increasing temperature up to 60 °C, for 30 min. Finally, a solution of ethylene glycol was added with increasing temperature up to 90 °C, forming a polymeric complex, calcined at 500 °C. 

TPSR measurements were carried out in a multipurpose unit equipped with a quadrupole mass spectrometer (Balzers Prisma-QMS 200). The signal intensities of masses 2,16,18, 28, 44, 29, and 26 corresponding to H2, CH4, H2O, CO, CO2, CsHs, and C2H4 were monitored continuously. The reaction gas mixture consisted of 0.9 vol% CO2, 0.9 vol% C3Hg, and balanced with He. 

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