Ni-mordenite system: influence of SiO2/Al2O3 molar ratio on the catalytic activity in no reduction
Mordenites with SiO2/Al2O3molar ratio (MR) of 13, 20 and 90 were exchanged with a Ni2+. The samples were characterized byXRD. EDS, DRS and TEM. UV-Vis spectra of all Ni-exchanged samples were typical for a Ni(H2O)6(2+) ions octahedrally coordinated by water molecules. In the UV range, samples with MR of 20 and 90 showed absorption around 250-300 nm due to partial dehydration on Ni2+ ions and their coordination with O2- of the zeolite framework. It was revealed that Ni species formed on mordenite NiNaMor13 with low molar ratio are weakly? bound to the mordenite framework; as a consequence, high catalytic activity in NO reduction is observed. Easy red-on transformation of such a species rasults in the activation of propene pyrolysis with formation of carbon nanostructures.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Universidad Autónoma Metropolitana, División de Ciencias Básicas e Ingeniería
2012
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1665-27382012000300010 |
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