Understanding Zn Functions on Hydrothermal Stability in a One-Pot-Synthesized Cu&Zn-SSZ-13 Catalyst for NH3 Selective Catalytic Reduction

Copper and iron promoted ZrO2 catalysts were prepared by one-pot synthesis using urea. The studied catalysts were characterized by XRD, N2 physisorption, XPS, temperature-programmed desorption of NH3 (NH3-TPD), and tested by the selective catalytic reduction by ammonia (NH3-SCR) of NO in the absence and presence of water vapor, under the experimental conditions representative of exhaust gases from stationary sources. The influence of SO2 on catalytic performance was also investigated. Among the studied catalysts, the Fe-Zr sample showed the most promising results in NH3-SCR, being active and highly selective to N2. The addition of SO2 markedly improved NO and NH3 conversions during NH3-SCR in the presence of H2O. The improvement in acidic surface properties is believed to be the cause.

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Introducing tin to develop ternary metal oxides with excellent hydrothermal stability for NH3 selective catalytic reduction of NO

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2021.120125 ◽

2021 ◽

Vol 291 ◽

pp. 120125

Author(s):

Jingjing Liu ◽

Guangzhi He ◽

Wenpo Shan ◽

Yunbo Yu ◽

Yanlong Huo ◽

...

Keyword(s):

Metal Oxides ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Hydrothermal Stability ◽

Reduction Of No ◽

Ternary Metal

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Preparation of Mesoporous Mn–Ce–Ti–O Aerogels by a One-Pot Sol–Gel Method for Selective Catalytic Reduction of NO with NH3

Materials ◽

10.3390/ma13020475 ◽

2020 ◽

Vol 13 (2) ◽

pp. 475

Author(s):

Yabin Wei ◽

Shuangling Jin ◽

Rui Zhang ◽

Weifeng Li ◽

Jiangcan Wang ◽

...

Keyword(s):

Selective Catalytic Reduction ◽

Lewis Acid ◽

Catalytic Reduction ◽

Sol Gel ◽

Acid Sites ◽

Lewis Acid Sites ◽

One Pot ◽

Gel Method ◽

Nh3 Scr ◽

Composite Aerogels

Novel Mn–Ce–Ti–O composite aerogels with large mesopore size were prepared via a one-pot sol–gel method by using propylene oxide as a network gel inducer and ethyl acetoacetate as a complexing agent. The effect of calcination temperature (400, 500, 600, and 700 °C) on the NH3–selective catalytic reduction (SCR) performance of the obtained Mn–Ce–Ti–O composite aerogels was investigated. The results show that the Mn–Ce–Ti–O catalyst calcined at 600 °C exhibits the highest NH3–SCR activity and lowest apparent activation energy due to its most abundant Lewis acid sites and best reducibility. The NO conversion of the MCTO-600 catalyst maintains 100% at 200 °C in the presence of 100 ppm SO2, showing the superior resistance to SO2 poisoning as compared with the MnOx–CeO2–TiO2 catalysts reported the literature. This should be mainly attributed to its large mesopore sizes with an average pore size of 32 nm and abundant Lewis acid sites. The former fact facilitates the decomposition of NH4HSO4, and the latter fact reduces vapor pressure of NH3. The NH3–SCR process on the MCTO-600 catalyst follows both the Eley–Rideal (E–R) mechanism and the Langmuir–Hinshelwood (L–H) mechanism.

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One pot synthesis of a highly efficient mesoporous ceria–titanium catalyst for selective catalytic reduction of NO

RSC Advances ◽

10.1039/c6ra17840e ◽

2016 ◽

Vol 6 (80) ◽

pp. 76556-76567 ◽

Cited By ~ 18

Author(s):

Guodong Zhang ◽

Weiliang Han ◽

Fang Dong ◽

Luyao Zong ◽

Gongxuan Lu ◽

...

Keyword(s):

Selective Catalytic Reduction ◽

Titanium Oxide ◽

Preparation Method ◽

Catalytic Reduction ◽

Oxide Catalysts ◽

One Pot ◽

Titanium Catalyst ◽

Reduction Of No ◽

Content Preparation ◽

Highly Dispersed

Highly dispersed mesoporous ceria–titanium oxide catalysts were prepared by a one pot hydrothermal. The effect of Ce and P123 content, preparation method, stability, resisting H2O, SCR reaction and deactivation mechanism were investigated in detail.

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