Montmorillonite based porous clay heterostructures modified with Fe as catalysts for selective catalytic reduction of NO with propylene

Su, Yaxin; Deng, Wei; Dong, Shilin; Li, Qiancheng; Zhao, Ben

doi:10.1016/j.cej.2018.07.201

Cited by 59 publications

(25 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure showed the XRD results of Mt, Al‐PILC and their corresponding MnCe loaded samples. The (001) and (100) feature peaks of Mt clay could not be observed on either Clay‐MnCe or Al‐PILC‐MnCe possibly due to delamination; or the formation of ‘House‐of‐card’ structure; or strong interaction between MnCe with the local Al/Si species . Upon the load of MnCe, no obvious diffraction peaks corresponding to crystalline Ce or Mn oxides could be observed, suggesting the MnCe oxides were either amorphous or in very small crystallites size of less than 4 nm diameter or well dispersed on the base .…”

Section: Resultsmentioning

confidence: 97%

“…The small peak observed at 2θ = 9° for Al‐PILC could be suggesting a very small fraction of the clay was not pillared . When comparing Al‐PILC and Al‐PILC‐MnCe, the (001) and (100) peaks remained in the Al‐PILC but not in Al‐PILC‐MnCe, indicating the layered structure was maintained after Al‐intercalation however MnCe‐loading caused structure collapse …”

Section: Resultsmentioning

confidence: 98%

“…The NO x conversion rate (X NO , %) and the N 2 selectivity rate (S N2 , %) were attained by the following Eq. (1) and (2). [17][18][19][20][21][22]…”

Section: Nh 3 -Scr Experimentsmentioning

confidence: 99%

“…NO x are emitted from the stationary and mobile exhaust, such as the coal fired power plants, cement, steel manufacturing factories and motor vehicles. The selective catalytic reduction of NO x to N 2 with NH 3 (NH 3 ‐SCR) is an effective technique for NO x elimination . The commercial Vanadium‐based NH 3 ‐SCR catalyst, such as V 2 O 5 ‐WO 3 (MoO 3 )/TiO 2 , operates in a narrow reaction temperature window of 300–400 °C, hence, the SCR catalyst units need to be installed in the upstream of the desulfurizers and dust removal devices.…”

Section: Introductionmentioning

confidence: 99%

“…The selective catalytic reduction of NO x to N 2 with NH 3 (NH 3 -SCR) is an effective technique for NO x elimination. [1][2][3] The commercial Vanadiumbased NH 3 -SCR catalyst, such as V 2 O 5 -WO 3 (MoO 3 )/TiO 2 , operates in a narrow reaction temperature window of 300-400°C, hence, the SCR catalyst units need to be installed in the upstream of the desulfurizers and dust removal devices. However, this setup can cause some problems, such as the oxidation of SO 2 to SO 3 , corrosion of the downstream devices and the deactivation of catalysts due to dust and alkali metals deposition.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Background Selective catalytic reduction of nitrogen oxides with ammonia (NH3‐SCR) is an effective method for the nitrogen oxides (NOx) removal. This study aimed to develop a highly efficient NH3‐SCR catalyst using the naturally available Montmonrillonite (Mt) clay as the catalyst support. Results Mt was processed into PILC by Al/Zr intercalations, impregnated with MnCe mixed active components and loaded with transition metals to achieve X‐AlZr‐PILC‐MnCe (X = V, W, Co or Mo) catalysts. The optimized Mo‐AlZr‐PILC‐MnCe showed the best NH3‐SCR performance with a NO conversion rate of nearly 100% in the temperature range of 240–300 °C, and N2 selectivity of above 85% in the range of 140–300 °C. Conclusions The catalysts were characterized by SEM, BET, XRD, XPS, H2‐TPR, NH3‐TPD to define the relationships between structure, chemical properties and catalytic activity. The enhanced catalytic performance of Mo‐AlZr‐PILC‐MnCe was mainly owing to the increased acidity and better redox ability. In situ DRIFT studies indicated the deposition of Mo changed the reaction from the E‐R to the L‐H mechanism. © 2020 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

“…The NO x conversion rate (X NO , %) and the N 2 selectivity rate (S N2 , %) were attained by the following Eq. (1) and (2). [17][18][19][20][21][22]…”

Section: Nh 3 -Scr Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

An effective selective catalytic reduction catalyst contains oxygen bridge for NO _x reduction based on low concentration of C ₃ H ₆ at medium‐low temperatures

Liu

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Ammonia slip in NH 3 -SCR will lead to the formation of viscous salt, which may block the downward heat exchangers, which is particularly serious in oil refinery stations. Oil refinery stations are usually rich in low concentration propane (C 3 H 6 ), and C 3 H 6 -SCR is considered to be a very promising NO x emission reduction technology. This study reported an effective NO x reduction catalyst based on low concentration C 3 H 6 at medium-low temperature. CeO 2 was used to optimize the catalyst, but instead of doping CeO 2 to active component, and it was found that doping CeO 2 on TiO 2 to produce Ce-Ti synthetic support was effective. This study elucidates that in refinery tail gas environment, a 5 wt.% Mn loaded on Ce-Ti support catalyst (Mn 5 -Ce/TiO 2 ) can achieve 70% NO conversion, meanwhile the N 2 selectivity is 100%. In order to explore the mechanism of activity enhancement, the catalysts were characterized before and after reaction. The results indicate that the addition of CeO 2 provided more acid sites for the adsorption of propene, and the structure and properties of Mn 5 -Ce/TiO 2 hardly changed after reaction, which helped to maintain high activity in de-NO x process. The oxidation of Ce 3+ to Ce 4+ , and the reduction of Mn 3+ to Mn 2+ promoted the reduction of NO, while the oxygen bridge Ce-O-Ti promoted the stability of the catalyst, so as to achieve a high conversion of NO.

show abstract

Fe/Acid‐montmorillonite as effective Fenton‐like catalyst for the removal of methylene blue

Zhao

Cai

Zhang

et al. 2022

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Background Most dyes are toxic, carcinogenic, and mutagenic, all of which cause severe harm to human health and the environment. Therefore, it is essential to find the most suitable method to treat dye wastewaters before discharge. In this study, the natural Ca‐type montmorillonite (Ca‐MMT) was activated by HNO3 (20 wt.%) solution under different temperatures to obtain acid‐activated MMT (Acid‐MMT). Fe (10 wt.%) was supported on Acid‐MMT (Fe/Acid‐MMT) via the impregnation method using Fe(NO3)3·9H2O as a precursor. Meanwhile, the removal of methylene blue (MB) by heterogeneous Fenton‐like reaction using Fe/Acid‐MMT as catalyst was evaluated. The material was characterized by Fourier transform infrared spectroscopy (FT‐IR), X‐ray diffraction (XRD), X‐ray photoeletron spectroscopy (XPS), scanning electron microscopy (SEM), N2 adsorption–desorption at low temperature, and the temperature program desorption of NH3 (NH3‐TPD) techniques. Results The acidity and textural properties of the Acid‐MMT were adjusted by varying the acid activation temperature. Moreover, the amount of acidity and the surface area of the catalyst had a noticeable effect on the removal efficiency of MB. Fe‐supported Acid‐MMT activated by HNO3 at 100°C (Fe/Acid‐MMT‐100) catalyst exhibited the highest removal efficiency of MB. The removal efficiency of the MB was more than 97.8% under the following reaction conditions: H2O2 concentration of 0.85 mmol·L−1, Fe/Acid‐MMT‐100 dosage of 0.75 g°L−1, temperature of 50°C, and initial solution pH of 3.0–9.0. Conclusion An efficient Fe/Acid‐MMT catalyst for a Fenton‐like reaction was obtained by optimizing the acid treatment temperature of Ca‐MMT. The synergistic effect between its excellent adsorption ability and the ∙OH generated from H2O2 activated by Fe/Acid‐MMT would enhance MB removal efficiency in a Fenton‐like system. © 2022 Society of Chemical Industry (SCI).

show abstract

Montmorillonite based porous clay heterostructures modified with Fe as catalysts for selective catalytic reduction of NO with propylene

Cited by 59 publications

References 52 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

An effective selective catalytic reduction catalyst contains oxygen bridge for NO _x reduction based on low concentration of C ₃ H ₆ at medium‐low temperatures

Fe/Acid‐montmorillonite as effective Fenton‐like catalyst for the removal of methylene blue

Contact Info

Product

Resources

About

Montmorillonite based porous clay heterostructures modified with Fe as catalysts for selective catalytic reduction of NO with propylene

Cited by 59 publications

References 52 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

An effective selective catalytic reduction catalyst contains oxygen bridge for NO x reduction based on low concentration of C 3 H 6 at medium‐low temperatures

Fe/Acid‐montmorillonite as effective Fenton‐like catalyst for the removal of methylene blue

Contact Info

Product

Resources

About

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

An effective selective catalytic reduction catalyst contains oxygen bridge for NO _x reduction based on low concentration of C ₃ H ₆ at medium‐low temperatures