Cerium-loaded MnO x /attapulgite catalyst for the low-temperature NH 3 -selective catalytic reduction

Xie, Aming; Zhou, Xingmeng; Huang, Xiaoyan; Liang, Ji; Zhou, Wenting; Luo, Shiping; Yao, Chao

doi:10.1016/j.jiec.2017.01.034

Cited by 50 publications

(19 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XPS results demonstrate that the surface Mn 4+ content on the Al‐Mn‐PILC sample was higher than that of the Mn/Al‐PILC. It is well recognized that Mn 4+ was more active than Mn 3+ or Mn 2+ at low temperatures . In addition, the H 2 ‐TPR results also show that the reduction temperatures of Al‐Mn‐PILC were significantly lower than those of Mn/Al‐PILC.…”

Section: Discussionsupporting

confidence: 88%

“…The lower reduction temperatures indicated a strong interaction between manganese and cerium in the catalyst after Ce loading, which could effectively promote the redox behavior of the Al‐Mn‐PILC sample. For the 8Ce/Al‐Mn‐PILC sample (Figure e), four reduction peaks appeared at 357°C, 429°C, 541°C, and 633°C, which could be attributed to reduction of MnO 2 to Mn 2 O 3 , Mn 2 O 3 to MnO, surface Ce 4+ to Ce 3+ , and the iron species and bulk ceria, respectively . It is interesting to note that for the 8Ce/Al‐Mn‐PILC sample, temperature (357°C) of the first peak gradually shifted to a lower temperature, compared with that of Al‐Mn‐PILC sample.…”

Section: Resultsmentioning

confidence: 90%

“…The NH 3 ‐TPD of the y Ce/Al‐Mn‐PILC catalysts is shown in Figure e,f. The total acidity of 8Ce/Al‐Mn‐PILC (0.136 mmol/g) and 9Ce/Al‐Mn‐PILC (0.101 mmol/g) was higher than that of Al‐Mn‐PILC because addition of ceria introduced some new acid centers . It is a possible reason for the higher activity of the ceria‐loaded samples.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in the Mn 2p XPS spectra (Figure b), the surface Mn 4+ /(Mn 3+ + Mn 2+ ) molar ratio increased significantly after ceria doping, which might be due to the fact that Ce 4+ could oxidize Mn 3+ to Mn 4+ . Similar phenomena have been also reported in the literature of Mn‐Ce system . It is generally accepted that the Mn 4+ species play a major role in improving the performance of low‐temperature NH 3 ‐SCR .…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH₃ at low temperatures

Cheng

et al. 2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

The yCe/Al-Mn-pillared interlayered clay (PILC, y [Ce content] = 8-9 wt%) catalysts were prepared using the impregnation method. Catalytic activities of the materials for the selective catalytic reduction (SCR) of NO with NH 3 at low temperatures were evaluated, and physicochemical properties of the samples were characterized by X-ray diffraction, N 2 adsorption-desorption, temperature-programmed reduction, ammonia temperature-programmed desorption, X-ray photoelectron spectroscopy, and in situ diffuse reflectance infrared Fourier transform spectroscopy techniques. It is found that introduction of cerium enhanced NO conversions at low temperatures, and the 8Ce/Al-Mn-pillared sample showed the highest NO conversion (92% at 300 C). The superior catalytic activity of 8Ce/Al-Mn-PILC was associated with the change in active component and increases in amounts of the surface chemisorbed oxygen species and the acid sites after ceria loading. Additionally, the SCR reaction mechanism over 8Ce/Al-Mn-PILC followed both Langmuir-Hinshelwood and Eley-Rideal mechanisms, with the former being dominant. K E Y W O R D SAl-Mn copillared clay, ceria loading, selective catalytic reduction, in situ DRIFTS | Al-Mn-PILC-supported ceria catalystsThe yCe/Al-Mn-PILC (y = 8 and 9 wt%) samples were prepared by impregnating the Al-Mn-PILC support with Ce (NO 3 ) 3 Á6H 2 O. Then, the sample was dried at 120 C for 6 hr and calcined at 400 C for 2 hr in an air atmosphere. | Al-PILC-supported Mn and claysupported Ce-Mn catalystsThe Mn/Al-PILC (Mn [i.e., Mn/{Mn + Al-PILC}] was 10 wt%, which was the same content of Mn in Al-Mn-2 of 14 CHENG ET AL.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH₃ at low temperatures

Cheng

et al. 2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Clay minerals have been used as the catalyst carrier, including montmorillonite, kaolin, bentonite, etc. Among those, attapulgite has gained a lot of research attention [14]- [16] due to its peculiar structural characteristics suitable for adsorbent and catalyst carrier [17], [18]. Zhang and Nan.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Particle Reusable Heterogeneous Catalyst Fe3O4/ATP for Methylene Blue Decolorization

Zhang¹,

Qian²,

Dong³

2019

IJESD

View full text Add to dashboard Cite

New simple wet-ultrasonic method was employed to synthesize akind of particle heterogeneous catalyst Fe 3 O 4 /attapulgite (Fe 3 O 4 /ATP), which used attapulgite particles as catalyst carrier and Fe 3 O 4 as active component loaded on the carrier. The catalyst is low cost and easy to prepare, and the effects of various preparing factors on its catalytic performance were investigated and discussed. The heterogeneous catalyst was characterized using SEM, FT-IR and XRD for its structure and catalysis properties. Fe 3 O 4 /ATP was used as the catalyst to decolorize high concentration (100mg/L) methylene blue (MB) in the heterogeneous Fenton system. Box-Behnken design (BBD) method was used for experimental design, data analysis and optimization. The influences of catalyst dosage, H 2 O 2 initial concentration and pH value on MB decolorization ratios in Fe 3 O 4 /ATP/H 2 O 2 heterogeneous Fenton system were studied. The heterogeneous catalyst Fe 3 O 4 /ATP has excellent catalytic performance and more than 99%MB decolorization were achieved under the optimum conditions. Higher decolorization ratio was obtained for recycled use of Fe 3 O 4 /ATP. Comparison experiments showed MB decolorization in Fe 3 O 4 /ATP/H 2 O 2 system is really a catalytic process. Furthermore, Fe 3 O 4 /ATP can be easily separated from the solution and reused due to its particle form. Index Terms-Fe 3 O 4 /attapulgite, particle catalyst, heterogeneous Fenton system, methylene blue decolorization.

show abstract

Novel 2D Layered Manganese Silicate Nanosheets with Excellent Performance for Selective Catalytic Reduction of NO with Ammonia

Wan

Sun

et al. 2022

ChemCatChem

View full text Add to dashboard Cite

Two‐dimensional (2D) catalysts are highly attractive for their great potential in environment remediation and energy conversion. In this work, a novel layered manganese silicate (MnSiO3) catalyst was synthesized by hydrothermal method using silica in vermiculite, a layered silicate clay mineral, as the lattice‐matching matrix and silicon source. The epitaxial growth of MnSiO3 is confined in the 2D directions, resulting in the morphology of vermiculite crystal thin nanosheets. The physichemical characterization results showed that MnSiO3 possessed higher Mn4+ content, acidic sites and reducing substances than that of MnOx/SiO2. The MnSiO3 therefore exhibited 100 % NO conversion rate with 85 % N2 selectivity at 150 °C in the NH3−SCR process. In situ DRIFTS studies show that MnSiO3 has strong NO adsorption capacity and NH3 activation capacity, which is beneficial to the improvement of NH3−SCR activity.

show abstract

Cerium-loaded MnO x /attapulgite catalyst for the low-temperature NH 3 -selective catalytic reduction

Cited by 50 publications

References 42 publications

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH₃ at low temperatures

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH₃ at low temperatures

Preparation of Particle Reusable Heterogeneous Catalyst Fe3O4/ATP for Methylene Blue Decolorization

Novel 2D Layered Manganese Silicate Nanosheets with Excellent Performance for Selective Catalytic Reduction of NO with Ammonia

Contact Info

Product

Resources

About

Cerium-loaded MnO x /attapulgite catalyst for the low-temperature NH 3 -selective catalytic reduction

Cited by 50 publications

References 42 publications

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH3 at low temperatures

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH3 at low temperatures

Preparation of Particle Reusable Heterogeneous Catalyst Fe3O4/ATP for Methylene Blue Decolorization

Novel 2D Layered Manganese Silicate Nanosheets with Excellent Performance for Selective Catalytic Reduction of NO with Ammonia

Contact Info

Product

Resources

About

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH₃ at low temperatures

Ceria‐modified Al‐Mn‐pillared clay catalysts for the selective catalytic reduction of NO with NH₃ at low temperatures