Characterization of iron-doped mesoporous silica nanoparticles for CO2 methanation
DOI:
https://doi.org/10.11113/mjcat.v3n2.74Keywords:
CO2 methanation, mesoporous silica nanoparticles, Fe catalystAbstract
Fe metal catalysts supported on mesoporous silica nanoparticles (MSN) with various Fe loading (1-15 wt%) have been prepared by the incipient wetness impregnation method. The result obtained revealed that the increasing of Fe loading (1–15 wt.%) decreased the crystallinity of MSN and N2 adsorption as evidenced by XRD and N2 physisorption, respectively. 29Si NMR result showed that the increasing of Fe loading affected the arrangement of Si atom by increasing the population of Q2 with a concomitant decrease of Q3 and Q4. The addition of Fe on MSN also increased the mononuclear cations, oligomeric and bulky iron oxide (Fe2O3) species in MSN. The catalyst activities on CO2 methanation followed the order 10Fe/MSN > 15Fe/MSN > 5Fe/MSN > 1Fe/MSN. The high activity of 10Fe/MSN may be related to its structural properties tailored by bulky Fe species on the outer part of MSN surface. Based on these results, it may be suggested that the catalytic activity depends on the iron oxide species developed by an appropriate amount of Fe species on the outer surface of MSN.
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