Low-temperature SCR of NO with NH 3 over noble metal promoted Fe-ZSM-5 catalysts

We have reported previously the excellent performance of Fe-exchanged ZSM-5 for selective catalytic reduction (SCR) of NO with ammonia at high temperatures (300–400 °C). In this work, we found that the reaction temperature could be decreased to 200–300 °C when a small amount of noble metal (Pt, Rh, or Pd) was added to the Fe-ZSM-5. The SCR activity follows the order Pt/Fe-ZSM-5 > Rh/Fe-ZSM-5 > Pd/Fe-ZSM-5 at 250 °C. On the Pt promoted Fe-ZSM-5, 90% NO conversion was obtained at 250 °C at GHSV  = 1.1 ×  10 5  h −1 . Moreover, the noble metal improved the resistance to H 2 O and SO 2 . The presence of H 2 O and SO 2 decreased the SCR performance only very slightly.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/44250/1/10562_2004_Article_3462.pd

Removal of Phenol from Aqueous Solution by Adsorption on to Coal Fly Ash

The present work examines the possible use of fly ash, a byproduct of coal power stations, as a means of removing phenol from water, or equivalently, of restricting its movement in solid wastes or soil. Equilibrium experiments were performed to evaluate the removal efficiency of fly ash. The adsorption experiments were undertaken using fly ash treated at three different pH levels and with three different temperatures. The results indicate that although phenol can be removed from water, this depends markedly on the temperature and pH value of the treatment solution employed

Characterization of alumina-supported Pt, Ni and PtNi alloy catalysts for the dry reforming of methane

Two bimetallic PtNi catalysts supported on a nanostructured c-Al2O3 together with the corresponding monometallic materials, employed for the dry reforming of methane, have been prepared and characterized. Characterization of the catalysts, in reduced form, has been performed by FTIR spectroscopy of adsorbed carbon monoxide at low and room temperature. XRD, TEM and XPS analysis have also been performed. IR spectra of adsorbed CO indicate that the surface of the PtNi catalysts is dominated by Pt centers, whose electron-withdrawing character is increased by Ni. It has also been confirmed the formation of PtNi alloy, which is enriched at the surface by Pt and has smaller metal crystal size than metal particles in monometallic Pt and Ni catalysts. The alloy formation is associated with higher activity and lower production of carbonaceous materials upon dry reforming of methane

Yttria \u2013 stabilized zirconia (YSZ) supported Ni-Co alloys (precorsor of SOFC anodes) as catalysts for the steam reforming of ethanol.

Bioethanol is an attractive fuel for direct internal reforming SOFC (DIR-SOFC). The aim of this work is to investigate the activity of Ni\u2013YSZ, used as precursor for the preparation of SOFC anodes and as catalyst of the ethanol steam reforming reaction. The effect of the addition of cobalt is also studied, as the best performance is given by Ni\u2013Co (25:25)/YSZ catalyst. This achieves total conversion of ethanol around 670 K, at which temperature the H2 yield is 65%. The addition of Co results in the inhibition of the dehydration reaction as well as of methane production. Furthermore, Co also has an effect on the hydrogen yield, by increasing it and thus apparently favouring methane steam reforming

Production of hydrogen by steam reforming of C3 organics over Pd-Cu/gamma-Al2O3 catalyst

The conversion of the C3 organics propane, propene, isopropanol and acetone in auto-thermal and endothermic steam reforming conditions has been investigated over a Pd\u2013Cu/Al2O3 catalyst in a flow reactor. Although several reactions may occur at lower temperatures (like dehydrogenation, oxidative dehydrogenation, dehydration and combustion), steam reforming of 2-propanol, acetone and propane only start above 850K and with incomplete selectivity. Cracking and methanation lower the selectivity to COx and hydrogen. The C\u2013C bond breaking step is considered to be rate determining. The presence of an oxygenated functional group is consequently not useful to lower reaction temperature, although the use of the alcohol and the ketone may be interesting because of the renewable nature of these reactants. Steam reforming of propene starts at significantly lower temperature (600\u2013700 K) and is by far the most selective to COx and hydrogen over our catalyst