Uniformly active phase loaded selective catalytic reduction catalysts (V2O5/TNTs) with superior alkaline resistance performance
2016
Wang, Haiqiang | Wang, Penglu | Chen, Xiongbo | Wu, Zhongbiao
In this work, protonated titanate nanotubes was performed as a potential useful support and different vanadium precursors (NH4VO3 and VOSO4) were used to synthesize deNOx catalysts. The results showed that VOSO4 exhibited better synergistic effect with titanate nanotubes than NH4VO3, which was caused by the ion-exchange reaction. Then high loading content of vanadium, uniformly active phase distribution, better dispersion of vanadium, more acid sites, better V5+/V4+ redox cycles and superior oxygen mobility were achieved. Besides, VOSO4-based titanate nanotubes catalysts also showed enhanced alkaline resistance than particles (P25) based catalysts. It was strongly associated with its abundant acid sites, large surface area, flexible redox cycles and oxygen transfer ability. For the loading on protonated titanate nanotubes, active metal with cation groups was better precursors than anion ones. V2O5/TNTs catalyst was a promising substitute for the commercial vanadium catalysts and the work conducted herein provided a useful idea to design uniformly active phase loaded catalyst.
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