RESEARCH PAPER
Experimental study on selective catalytic reduction of NO by C3H6 over Fe/Ti-PILC catalysts

https://doi.org/10.1016/S1872-5813(18)30051-3Get rights and content

Abstract

Ti-pillared interlayer clay (PILC)-based catalysts ion exchanged with Fe were prepared and used for selective catalytic reduction of NOx using propylene as the reducing agent under oxygen-rich conditions. The relationship between structure and properties of the catalysts was studied using N2-adsorption/desorption, XRD, UV-vis, H2-TPR, and Py-FTIR. The results show that the prepared 19Fe/Ti-PILC catalyst can achieve complete removal of NO at 400°C, and N2 selectivity can reach over 90% and has better resistance to water vapor and SO2. N2-isothermal adsorption/desorption and XRD results show that structure of montmorillonite is opened, cross-linked pillars are effective, and a large specific surface area and pore volume are formed. UV-vis results show that the denitrification activity of the catalyst is related to content of oligomeric FexOy. Py-FTIR results show that both Lewis acid and Brønsted acid are presented on the catalyst surface. Fe3+ loading into the pillared clay can significantly increase the Lewis acid content. Lewis acid is one of the influencing factors on the denitrification activity of the catalyst. H2-TPR indicates that the catalyst has a strong reduction ability at about 400°C, and reduction ability of the catalyst is mainly represented by the reduction of Fe3+→Fe2+.

References (33)

Cited by (27)

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    As both Bpy and Hpy are related to the water and surface hydroxyls, they should decrease with increasing thermal treatment temperature (Tyagi et al., 2006b). An intense band at 1490 cm−1 (Fig. 7a) may be attributable to pyridine associated with all types of solid surface acid sites, i.e., Bpy + Lpy + Hpy (Tyagi et al., 2006b⁠; Reddy et al., 2009⁠; Dong et al., 2018). As can be further seen in Fig. 7a, the total amount of acid sites in the six TPMt decreased with increasing thermal treatment temperature, and these sites are expected to predominantly originate from the Mt. component.

  • SCR of NO with CH<inf>4</inf>over Fe/Ga<inf>2</inf>O<inf>3</inf>-Al<inf>2</inf>O<inf>3</inf>and the mechanism

    2021, Journal of Environmental Chemical Engineering
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    The cordierite catalyst loaded with Fe could achieve 97% NO reduction at 600 °C and maintained more than 60% NO conversion after introducing 2.1% water vapor [8]. Fe/Ti-PILC [30] and Fe-PILC [31] catalysts could achieve NO conversion of more than 80% at 400 °C in the presence of 10% H2O and 0.2% SO2. Fe was also showed to enhance the ability of Ag/Al2O3/CM catalysts to resist SO2 and H2O in the flue gas [32].

  • Effect of synthesis parameters on catalytic performance of Fe/Ti-PILC catalysts for SCR-C<inf>3</inf>H<inf>6</inf> and in situ DRIFTS study

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    Fe was proved to have a strong resistance to SO2 and H2O [19,20]. Dong et al. [21] prepared Fe-Ti/PILC for the SCR-C3H6 and showed that 100% NO conversion was achieved at 400 °C. Under exposure to 10% H2O and 200 ppm SO2, the catalysts showed a NO conversion above 90%, only a slight decrease as compared to the NO conversion when there were no H2O and SO2.

  • Boosting the Alkali/Heavy Metal Poisoning Resistance for NO Removal by Using Iron-Titanium Pillared Montmorillonite Catalysts

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    Besides, to improve the stability of montmorillonite’s layered structure, pillaring is a widely applied method that could express the maximal catalytic property of the pillared transition or rare metal species (Han et al., 2018; Long and Yang, 2000). Among the various reported pillared MMT materials, iron is verified to own the ability to enhance the acidity as well as the ammonia adsorption of the catalysts (Dong et al., 2018). Besides, iron is also proved to be a potential active metal that commonly used as metal oxides catalysts in NH3-SCR reaction (Liang et al., 2016).

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Foundation items: Supported by the National Natural Science Foundation of China (51278095) and Jiangsu Province Prospective Joint Research Projects (BY2015032-02).

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