کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1281670 | 1497531 | 2013 | 11 صفحه PDF | دانلود رایگان |
In this work, NiMgAl and RhNiMgAl catalysts prepared from HTLCs precursors were investigated for the Partial Oxidation of Methane (POM) at 550 and 750 °C. Samples have been characterized by XRD, TPR, H2 chemisorption, TPSR analyses, XPS, field emission scanning electron microscopy and Raman spectroscopy. NiMgAl catalysts with high Ni content (40 and 16 wt%) showed high stability and high methane conversion for POM. On the other hand those with lower Ni content (NiHT15 and NiHT25, with 6 and 4 wt%) exhibited low catalytic activity with low H2/CO ratio (<2) and fast deactivation. In RhNiHT25 (0.6 wt. % Rh), the Ni reducibility was improved, increasing the methane conversion and hydrogen selectivity. In addition, the noticeable increase in stability was related to the absence of carbon deposition after 30 h on stream at 550 °C. These results show that RhNiHT25 is promising for application in membrane reactors to produce high purity hydrogen.
► NiMgAl and RhNiMgAl catalysts were prepared from HTLC like precursors.
► The catalysts were tested for partial oxidation of methane at 750 and 550 °C.
► The Ni reducibility was improved due to the synergic effect between Rh and Ni.
► RhNiHT25 catalyst was very stable during at least 30 h of reaction.
► RhNiHT25 is promising for application in membrane reactors.
Journal: International Journal of Hydrogen Energy - Volume 38, Issue 14, 10 May 2013, Pages 5616–5626