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In the experiments carried out with an empty reactor

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Unformatted text preview: s the maximum temperature as in the catalytic tests. 4. Results and discussion - catalytic partial oxidation of propane 117 Using the empty reactor as well the reactor containing only the quartz wool. Almost • ƒ& IRU WKH HPSW\ UHDFWRU • ƒ& RYHU WKH TXDUW] ZRRO EHG $W ORZHU WHPSHUDWXUHV WKH FRQYHUVLRQV complete conversions were observed at temperatures and decreased drastically and were almost zero at 600°C (Fig. 36). CO (Y ≤ 51%), H2O (Y ≤ 46%), C2H4 (Y ≤ 32%) and CH4 (Y ≤ 20%) were the main products. The trend of their yields versus temperature reflected more or less the conversion. The yield of H2 decreased with decreasing temperature (Y ≤ 20%) and fell to zero at temperatures • ƒ& RYHU WKH 6L2 2 wool and • ƒ& LQ WKH HPSW\ UHDFWRU The yield of C H 2 2 exhibited the same trend as that of H2, but was always only a minor product (Y ≤ 6%). The yield of C3H6 exhibited the opposite trend (Y ≤ 16%). CO2 was only observed at high conversion in low amounts (Y ≤ 2%). Over the catalyst that did not contain the metallic Ni (Ni0C900 and Ni10C900 without prior reduction) similar results were obtained with regard to each other. Over both catalysts higher C3H8 than O2 conversions were observed regardless the reaction temperature. They were highest at 800°C ( •  DQG GHFUHDVHG VKDUSO\ DW ORZHU reaction temperatures (≤ 20%) (Fig. 37). The main products were CO (Y ≤ 27%), H2O (Y ≤ 31%), C2H4 (Y ≤ 31%), C3H6 (Y ≤ 21%) and CH4 (Y ≤ 16%). They followed the same trend observed for the blank reactor and SiO2 wool. Again the temperature dependence of the yield reflected more or less the conversion. H2 was only observed at temperatures > 700°C and only in small amounts (Y ≤ 7%). CO2 was always present and its yield increased with decreasing reaction temperature (Y ≤ 6%). C2H2 was only found in very small quantities (< 1%). To investigate if the catalyst Ni10C900 without previous reduction would be reduced by the reaction mixture at hi...
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