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Table 3-4 summarizes the binary gas mixtures and shows the experimental errors. A 5-gas calibration gas mix containing Ar, CO, CO2, H2 and CH4 was available to control the calibration routine. The results for the 5-gas mix are presented in Table 3-5. 863 - Pangas Composition of certified binary calibration gas mixtures. The gases Table 3-4. were purchased by PanGas (Linde AG, Switzerland) and SL gas (Messer-Griesheim, Switzerland). 9 Table 3-5. Composition of certified 5 gas mixture from SL Gas.

Thermodynamic data from [35]. The thermodynamic consequences for the system CH4/H2O are difficult to predict since all reaction are coupled with each other and depend on the composition of the gas. Figure 3-8 shows the calculated thermodynamic gas composition taking into account all possible reactions at an output pressure of 1 bar (105 Pa). Three different steam/carbon ratios for the system methane and water are calculated. A steam/carbon ratio of 1:3 is approximately the stoichiometry used for the temperature dependent experiments (Figure 3-8).

CATALYTIC Figure 3-8. TESTS Thermodynamic equilibrium calculation for a mixture methanewater with an understoichiometric amount of water. Steam/carbon ratio 3:10. Figure 3-9 represents the equilibrium in a system with a steam/carbon ratio of 1:1. Under these conditions steam-reforming is the dominating reaction. Methane and water are consumed, hydrogen CO2 and CO are produced. Between 725 K and 1050 K carbon deposition occurs by the Boudouard equilibrium and by methane cracking. The ratio carbon monoxide/carbon dioxide follows the Boudouard equilibrium, with increasing temperatures CO is favored over CO2.

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