Effects of WO3 and SiO2 doping on CeO2–TiO2 catalysts for selective catalytic reduction of NO with ammonia

Fan, Rongrong; Li, Zhaoqiang; Wang, Yan; Zhang, Cheng; Wang, Yu; Ding, Zhiyong; Guo, Xin; Wang, Rong

doi:10.1039/d0ra00053a

Cited by 20 publications

(16 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fan et al. found that SiO 2 addition can significantly enhance higher hydrothermal stability of CeO 2 /TiO 2 −SiO 2 especially between 550 and 600 °C [49c] …”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catalystmentioning

confidence: 99%

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

View full text Add to dashboard Cite

Selective catalytic reduction of NOx with NH3 (NH3−SCR) is one of the widely used process to abate NOx emission from both stationary and mobile sources. Recently, CeO2−TiO2 based NH3−SCR catalysts due to their excellent medium and high temperature activities, high N2 selectivity and environmentally friendly, have attracted much attention as great candidate to replace the commercial VOx−TiO2 based NH3−SCR catalysts. During the past years, extensive works have been done to achieve the industrial commercialization of CeO2−TiO2 based NH3−SCR catalyst. In this review, we summarize the recent studies on the mechanism, deactivation, preparation and modification of CeO2−TiO2 catalyst. The focus of this review is the modification strategies on improving the catalytic performance of CeO2−TiO2 catalyst. By comparing the effect of different modification strategies on the catalytic performance of CeO2−TiO2 catalyst, the perspectives and challenges of CeO2−TiO2 based catalyst for NH3−SCR of NOx are discussed.

show abstract

“…Fan et al. found that SiO 2 addition can significantly enhance higher hydrothermal stability of CeO 2 /TiO 2 −SiO 2 especially between 550 and 600 °C [49c] …”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catalystmentioning

confidence: 99%

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The highly dispersed WO3 enhanced the Ce-O-W reaction and Ce-O-Ti reaction, and consequently improved the performance of the NH3-SCR catalysts. Besides, the addition of WO3 improved the thermal stability of the catalysts at 550-600 °C [89], and a large cerium oxide phase and more TiO2 crystal formation can be avoided in the catalytic reaction process [90]. Eventually, from the reported work on the Ce-Mn/TiO 2 catalyst, it is not difficult to find that the rich variable valence states of Mn show excellent NH 3 -SCR activity at low temperature.…”

Section: Ce-w/tio2 Catalystmentioning

confidence: 99%

Preparation and Performance of Cerium-Based Catalysts for Selective Catalytic Reduction of Nitrogen Oxides: A Critical Review

et al. 2021

View full text Add to dashboard Cite

Selective catalytic reduction of nitrogen oxides with NH3 (NH3-SCR) is still the most commonly used control technology for nitrogen oxides emission. Specifically, the application of rare earth materials has become more and more extensive. CeO2 was widely developed in NH3-SCR reaction due to its good redox performance, proper surface acidity and abundant resource reserves. Therefore, a large number of papers in the literature have described the research of cerium-based catalysts. This review critically summarized the development of the different components of cerium-based catalysts, and characterized the preparation methods, the catalytic performance and reaction mechanisms of the cerium-based catalysts for NH3-SCR. The purpose of this review is to highlight: (1) the modification effect of the various metal elements for cerium-based catalysts; (2) various synthesis methods of the cerium-based catalysts; and (3) the physicochemical properties of the various catalysts and clarify their relations to catalytic performances, particularly in the presence of SO2 and H2O. Finally, we hope that this work can give timely technical guidance and valuable insights for the applications of NH3-SCR in the field of NOx control.

show abstract

“…The diffraction peak at 28.28°33.08°47.48°could be attributed to the (111), ( 200), (220) crystal plane of CeO 2 (PDF card: 89-8436), this indicated that a new CeO 2 crystal phase was formed. [37] This may be the reason that the catalytic activity no longer changed obviously with the cerium content exceeded 15 % in mainly temperature ranges. The CeO 2 /TiO 2 catalyst showed a strong TiO 2 diffraction peak and a slight CeO 2 diffraction peak, which indicated that a small amount of tungsten was helpful for the dispersion of Cerium (Figure 2b).…”

Section: Structure Analysismentioning

confidence: 99%

A Green CeO₂−WO₃/TiO₂ Medium‐Low Temperature de‐NO_x Catalyst for Selective Catalytic Reduction of NO_x with NH₃

Zhang

Tang

et al. 2021

ChemistrySelect

View full text Add to dashboard Cite

A series of CeO 2 À WO 3 /TiO 2 catalysts were synthesized by the co-precipitation method and used for selective catalytic reduction (SCR) of NO with NH 3 under medium-low temperature conditions with metatitanic acid as Ti source. A more reasonable weight ratio of CeO 2 and WO 3 was explored. The catalytic activity enhanced with the increase of cerium content, but the catalytic activity changed slightly in the temperature range of 240°C to 400°C when the cerium content exceeded 15 %. Tungsten could enhance the sulfur resistance by adjust-ing the degree of crystallization, acidity in the SCR process. When the weight ratio of CeO 2 to WO 3 was 15: 8, the conversion rate of NO was more than 90 % in the temperature range of 240°C to 440°C. For 15 %CeO 2 -8 %WO 3 /TiO 2 catalyst, the NO conversion was maintained around 84 % when the mixed gas was introduced SO 2 . At the same time, we have optimized the selection of carriers, metatitanic acid as a carrier was better than titanium dioxide.

show abstract

Effects of WO₃ and SiO₂ doping on CeO₂–TiO₂ catalysts for selective catalytic reduction of NO with ammonia

Abstract: A series of CeO2–WO3/TiO2–SiO2 catalysts were prepared for SCR of NOx with NH3, and the effect of WO3 and SiO2 doping on the activity and stability of the catalysts were discussed.

Cited by 20 publications

References 42 publications

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Preparation and Performance of Cerium-Based Catalysts for Selective Catalytic Reduction of Nitrogen Oxides: A Critical Review

A Green CeO₂−WO₃/TiO₂ Medium‐Low Temperature de‐NO_x Catalyst for Selective Catalytic Reduction of NO_x with NH₃

Contact Info

Product

Resources

About

Effects of WO3 and SiO2 doping on CeO2–TiO2 catalysts for selective catalytic reduction of NO with ammonia

Abstract: A series of CeO2–WO3/TiO2–SiO2 catalysts were prepared for SCR of NOx with NH3, and the effect of WO3 and SiO2 doping on the activity and stability of the catalysts were discussed.

Cited by 20 publications

References 42 publications

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

Preparation and Performance of Cerium-Based Catalysts for Selective Catalytic Reduction of Nitrogen Oxides: A Critical Review

A Green CeO2−WO3/TiO2 Medium‐Low Temperature de‐NOx Catalyst for Selective Catalytic Reduction of NOx with NH3

Contact Info

Product

Resources

About

Effects of WO₃ and SiO₂ doping on CeO₂–TiO₂ catalysts for selective catalytic reduction of NO with ammonia

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

A Green CeO₂−WO₃/TiO₂ Medium‐Low Temperature de‐NO_x Catalyst for Selective Catalytic Reduction of NO_x with NH₃