The effect of iron loading and hydrothermal aging on one-pot synthesized Fe/SAPO-34 for ammonia SCR

Andonova, Stanislava; Tamm, Stefanie; Montreuil, Clifford; Lambert, Christine; Olsson, Louise

doi:10.1016/j.apcatb.2015.07.007

Cited by 74 publications

(33 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fe-based zeolite have been extensively studied in the NH 3 -SCR reaction over the past decades. [6][7][8][9] However, the low-temperatures catalytic activity of Fe-based catalysts is still to be improved. 10,11 Moreover, the hydrothermal stability of this kind of catalysts needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

Liu

Zhao

et al. 2017

AIChE Journal

View full text Add to dashboard Cite

A series of core-shell structural deNO x catalysts using small-grain Beta supporting FeO x nanoparticles as the core and tunable CeO 2 thin film thickness as sheaths were designed and controllably synthesized. Their catalytic performances were tested for selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). It was found that CeO 2 shell thickness plays an important role in influencing the acidity and redox properties of the catalysts. Fe-Beta@CeO 2 core-shell catalysts exhibit excellent resistance to H 2 O and SO 2 and high NO x conversion (above 90%) in the wide temperature range (225-5658C). The kinetics result indicates that the coating of CeO 2 shell significantly increases the pore diffusion resistance of Fe-Beta@CeO 2 catalysts. Furthermore, in situ DRIFT results reveal that CeO 2 shell can promote the formation of NO 2 and cis-N 2 O 2 2 species. But too thick CeO 2 shell ($20 nm) would result in the formation of inactive nitrate species, and thereby lead to a decrease of high-temperature activity of the catalysts.

show abstract

Section: Introductionmentioning

confidence: 99%

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

Liu

Zhao

et al. 2017

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…High hydrothermal stability was also observed for Cu‐SAPO‐34 synthesized using one‐pot method . Subsequently, Fe‐SAPO‐34 was integrated with commercial Cu‐CHA to achieve an excellent activity over an extended active temperature window owing to its superior activity and stability at high temperature (Figure b) . However, Cu‐SAPO‐34 suffers from the deactivation in the steam at very low temperature (70 °C) .…”

Section: Current Zeolite‐based Nh3‐scr Materialsmentioning

confidence: 99%

Zeolitic Materials for DeNO_x Selective Catalytic Reduction

2017

View full text Add to dashboard Cite

Selective catalytic reduction (SCR) of NOx has been proven to be the most efficient technique for the removal of NOx (deNOx) from flue gas of stationary sources and diesel engine exhaust of mobile sources. Among various SCR catalysts, zeolites are considered as the most promising candidates for heavy‐duty trucks owing to their benign nature, very high NOx conversion and N2 selectivity, as well as excellent hydrothermal stability at high temperatures. In recent years, a tremendous number of research articles have reported on the evolution of zeolitic materials for deNOx, which makes a critical review timely to provide inspiration for future development. This paper first gives a chronological progress of zeolite catalysts specifically highlighting the CHA zeolites, the hotspot of present research and application, followed by a summary on the synthesis of CHA zeolites, the structure–activity relationships, as well as the reaction mechanisms and kinetics. Last but not least, a critical outlook is given together with expected research directions in developing zeolite‐based catalysts for deNOx.

show abstract

“…Recently, zeolites with Chabazite (CHA) structure, such as SSZ-13 [9,10] and SAPO-34 [11,12], have received much attention due to their outstanding hydrothermal durability and activity in the NH 3 -SCR. However, for the HC-SCR reaction, the pore radius of CHA structure (3.8 Å) may be a little smaller for hydrocarbon molecules (e.g., C 3 H 8 , C 3 H 6 ) through the zeolite channels.…”

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Zhou

Zhao

et al. 2019

Catalysts

View full text Add to dashboard Cite

Fe/Beta catalysts were used for the selective catalytic reduction of nitric oxide with propylene (C3H6-SCR) under lean-burn conditions, which were prepared by liquid ion-exchange (LIE), solid-state ion-exchange (SIE), and incipient wet-impregnation (IWI) methods. The iron species on Fe/Beta were characterized and identified by a combination of several characterization techniques. The results showed preparation methods had a significant influence on the composition and distribution of iron species, LIE method inclined to produce more isolated Fe3+ ions at ion-exchanged sites than IWI and SIE method. C3H6-SCR activity tests demonstrated Fe/Beta(LIE) possessed remarkable catalytic activity and N2 selectivity at temperature 300–450 °C. Kinetic studies of C3H6-SCR reaction suggested that isolated Fe3+ species were more active for NO reduction, whereas Fe2O3 nanoparticles enhanced the hydrocarbon combustion in excess of oxygen. According to the results of in situ DRIFTS, more isolated Fe3+ sites on Fe/Beta(LIE) would promote the formation of the key intermediates, i.e., NO2 adspecies and formate species, then led to the superior C3H6-SCR activity. The slight decrease of SCR activity after hydrothermal aging of Fe/Beta(LIE) catalyst might be due to the migration of isolated Fe3+ ions into oligomeric clusters and/or Fe2O3 nanoparticles.

show abstract

The effect of iron loading and hydrothermal aging on one-pot synthesized Fe/SAPO-34 for ammonia SCR

Cited by 74 publications

References 65 publications

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

Zeolitic Materials for DeNO_x Selective Catalytic Reduction

Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Contact Info

Product

Resources

About

The effect of iron loading and hydrothermal aging on one-pot synthesized Fe/SAPO-34 for ammonia SCR

Cited by 74 publications

References 65 publications

Fe‐Beta@CeO2 core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NOx with NH3

Fe‐Beta@CeO2 core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NOx with NH3

Zeolitic Materials for DeNOx Selective Catalytic Reduction

Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Contact Info

Product

Resources

About

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

Zeolitic Materials for DeNO_x Selective Catalytic Reduction