Selective catalytic reduction of nitric oxide with ammonia over high-activity Fe/SSZ-13 and Fe/one-pot-synthesized Cu-SSZ-13 catalysts

Yin, Chengyang; Peng, Cheng; Li, Xiang; Yang, Ralph T.

doi:10.1039/c6cy01027j

Cited by 48 publications

(28 citation statements)

References 59 publications

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“…Nitrogen adsorption–desorption isotherms of the Cu-SSZ-13 catalysts are illustrated in Figure . All samples can be regarded as typical microporous materials determined by hysteresis loops . Copper incorporation results in a slight decline in the BET surface area from 547 m 2 /g for Cu 0 -SSZ-13 to 483 m 2 /g for Cu 0.125 -SSZ-13.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Cu Concentration on the Selective Catalytic Reduction of NO with Ammonia for Aluminosilicate Zeolite SSZ-13 Catalysts

et al. 2021

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The influence of Cu concentration on the selective catalytic reduction (SCR) of NO with ammonia (NH 3 -SCR) for copper-exchanged aluminosilicate zeolite catalysts (Cu-SSZ-13) was investigated. The results demonstrate that the SCR performance of the catalysts increases initially and decreases subsequently with an increase in Cu concentration in the low-temperature region (100−300 °C). The highest low-temperature SCR activity (lightoff temperature is 149 °C) is obtained in the Cu 0.100 -SSZ-13 catalyst, i.e., the concentration of the Cu salt solution reaches up to 0.100 mol/L. BET and XRD results illustrate that the concentration of the Cu salt solution does not have a significant effect on the structure of the samples. The NH 3 -TPD and H 2 -TPR outcomes demonstrate that the amount of Lewis acidity and isolated Cu 2+ on Cu-SSZ-13 catalysts increases as the CuCl 2 concentration increases from 0 to 0.125 mol/L. However, most of the H + in the Brønsted acid sites (Si−OH−Al) are replaced by isolated Cu 2+ , which limits the storage and transfer capacity of ammonia. As a result, the catalytic efficiency of Cu-SSZ-13 reduces with a further increase in CuCl 2 concentration.

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Section: Resultsmentioning

confidence: 99%

“…All samples can be regarded as typical microporous materials determined by hysteresis loops. 24 Copper incorporation results in a slight decline in the BET surface area from 547 m 2 /g for Cu 0 -SSZ-13 to 483 m 2 /g for Cu 0.125 -SSZ-13. Accordingly, the micropore volume decreases from 0.262 to 0.238 cm 3 /g (Table 1).…”

Section: Introductionmentioning

confidence: 92%

Effect of Cu Concentration on the Selective Catalytic Reduction of NO with Ammonia for Aluminosilicate Zeolite SSZ-13 Catalysts

et al. 2021

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“…Cao等人 [48] 制备了掺Fe的Fe-Mn-Ce/γ-Al 酸性位含量均有明显增加. Yin等人 [51] 制备了Fe改性的一步法Cu-SSZ-13分子筛催化剂, 发现该催化剂具有更宽的活性温度窗口, 高温活性有一定提高, 特别是具有更好的抗SO 2 中毒性能.…”

Section: Fe改性催化剂unclassified

Research progress in the SO<sub>2</sub> resistance of denitration catalysts in low-temperature NH<sub>3</sub>-SCR reactions

Liu¹,

He²,

Mao³

et al. 2022

Sci. Sin.-Chim

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NH 3 -SCR reaction is one of the most widely used denitration technologies at present, and the catalyst is the core of the NH 3 -SCR technology. Because of its low-temperature activity and easy deactivation in the presence of SO 2 , the research on the low-temperature sulfur-resistance of denitration catalysts becomes a hot spot. In this review, the deactivation mechanism of NH 3 -SCR catalysts in the presence of SO 2 is reviewed. It is found that the deactivation of the catalysts is mainly due to the reaction of SO 2 with NH 3 and metal-active sites; the formation of ammonium sulfates or ammonium bisulfates will block the pores of the catalysts and affect the efficiency of the catalysts; the metal sulfates will lead to the deactivation of the active sites of the catalysts and cause the irreversible deactivation of the catalysts; the competitive adsorption of SO 2 and NO will also cause the deactivation of the catalysts. Based on the known mechanism of catalyst deactivation, some effective strategies for improving the SO 2 tolerance are proposed: reducing the adsorption and oxidation of SO 2 , constructing sacrificial sites to protect active sites and promoting the decomposition of sulfates. It is found that the sulfur resistance of the catalysts can be improved by some methods: such as metal modification, the special structure of catalysts, the influence of supports, acid catalysts. Finally, the development prospect of lowtemperature sulfur-resistant NH 3 -SCR denitration catalysts is prospected.

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“…More recently, Yin et al. apply EPR to the investigation of iron coordination in Fe‐SSZ‐13 for selective reduction of nitric oxide with ammonia . Two catalysts are studied: (1) direct ion exchange of an iron precursor with a one‐pot Cu‐SSZ‐13 catalyst (denoted as Fe‐one‐pot Cu‐SSZ‐13 (I. E.)); and (2) 5 wt % Fe on one‐pot Cu‐SSZ‐13 synthesized by incipient wetness impregnation (denoted as 5 wt % Fe/one‐pot Cu‐SSZ‐13 (I.W.I.)).…”

Section: Characterization Of Metal‐zeolite Composite Catalystsmentioning

confidence: 99%

“…Furthermore, an extra line at g=3.0 is only observed for the 5 wt % Fe/one‐pot Cu‐SSZ‐13 (I.W.I.) catalyst, which is likely due to the new Fe species that is observed only in the Fe‐one‐pot Cu‐SSZ‐13 (I. E.) catalyst, but the specific origin of this peak is unconfirmed …”

Section: Characterization Of Metal‐zeolite Composite Catalystsmentioning

confidence: 99%

Characterization of Metal‐zeolite Composite Catalysts: Determining the Environment of the Active Phase

et al. 2020

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Metal‐zeolite composite catalysts are attracting increased attention due to their unique multifunctional properties. However, it is challenging to identify the physicochemical environment of the active phase, which is essential to improve our understanding of the structure‐performance relationships of such complex catalysts. In this work, commonly available analytical techniques (FTIR, TEM, XRD, etc.) and state‐of‐the‐art user instrumentation (XAS, SANS, e‐TEM, etc.) are reviewed with respect to their applications at different stages of the catalyst lifetime, from early nucleation, to the reaction mechanism and deactivation. Each technique is discussed in detail with examples to provide suggestions and guidelines for choosing the characterization technique(s) that are most appropriate for determining the desired structure‐property relationships of metal‐zeolite composite catalysts. Understanding the most appropriate applications of characterization techniques promotes development of novel synthesis methodologies, and in turn, applications for designing active, selective and stable multifunctional metal‐zeolite composite catalysts.

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Selective catalytic reduction of nitric oxide with ammonia over high-activity Fe/SSZ-13 and Fe/one-pot-synthesized Cu-SSZ-13 catalysts

Abstract: Fe-impregnated one-pot-synthesized Cu-SSZ-13 catalysts showed excellent catalytic activities for the selective catalytic reduction (SCR) of NO with ammonia.

Cited by 48 publications

References 59 publications

Effect of Cu Concentration on the Selective Catalytic Reduction of NO with Ammonia for Aluminosilicate Zeolite SSZ-13 Catalysts

Effect of Cu Concentration on the Selective Catalytic Reduction of NO with Ammonia for Aluminosilicate Zeolite SSZ-13 Catalysts

Research progress in the SO<sub>2</sub> resistance of denitration catalysts in low-temperature NH<sub>3</sub>-SCR reactions

Characterization of Metal‐zeolite Composite Catalysts: Determining the Environment of the Active Phase

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Selective catalytic reduction of nitric oxide with ammonia over high-activity Fe/SSZ-13 and Fe/one-pot-synthesized Cu-SSZ-13 catalysts

Abstract: Fe-impregnated one-pot-synthesized Cu-SSZ-13 catalysts showed excellent catalytic activities for the selective catalytic reduction (SCR) of NO with ammonia.

Cited by 48 publications

References 59 publications

Effect of Cu Concentration on the Selective Catalytic Reduction of NO with Ammonia for Aluminosilicate Zeolite SSZ-13 Catalysts

Effect of Cu Concentration on the Selective Catalytic Reduction of NO with Ammonia for Aluminosilicate Zeolite SSZ-13 Catalysts

Research progress in the SO&lt;sub&gt;2&lt;/sub&gt; resistance of denitration catalysts in low-temperature NH&lt;sub&gt;3&lt;/sub&gt;-SCR reactions

Characterization of Metal‐zeolite Composite Catalysts: Determining the Environment of the Active Phase

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Research progress in the SO<sub>2</sub> resistance of denitration catalysts in low-temperature NH<sub>3</sub>-SCR reactions