Acid-pretreated red mud for selective catalytic reduction of NO  with NH3: Insights into inhibition mechanism of binders

Wang, Bin; Ma, Jun; Wang, Dong; Gong, Zhiqiang; Shi, Qinglong; Gao, Chuan; Lu, Chunmei; Crittenden, John C.

doi:10.1016/j.cattod.2020.05.036

Cited by 23 publications

(4 citation statements)

References 47 publications

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“…In recent years, many research studies have focused on the application of supported metal oxides [2,21], natural aluminosilicates modified with transition metals [22,23], modified activated carbon [24,25], or waste materials [26,27] as NH 3 -SCR catalysts. Apart from that, a bunch of catalytic systems based on natural or synthetic zeolites have been examined [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performance and Sulfur Dioxide Resistance of One-Pot Synthesized Fe-MCM-22 in Selective Catalytic Reduction of Nitrogen Oxides with Ammonia (NH3-SCR)—The Effect of Iron Content

Szymaszek

Díaz

Duraczyńska

et al. 2022

IJMS

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The catalytic performance of Fe-catalysts in selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR) strongly depends on the nature of iron sites. Therefore, we aimed to prepare and investigate the catalytic potential of Fe-MCM-22 with various Si/Fe molar ratios in NH3-SCR. The samples were prepared by the one-pot synthesis method to provide high dispersion of iron and reduce the number of synthesis steps. We have found that the sample with the lowest concentration of Fe exhibited the highest catalytic activity of ca. 100% at 175 °C, due to the abundance of well-dispersed isolated iron species. The decrease of Si/Fe limited the formation of microporous structure and resulted in partial amorphization, formation of iron oxide clusters, and emission of N2O during the catalytic reaction. However, an optimal concentration of FexOy oligomers contributed to the decomposition of nitrous oxide within 250–400 °C. Moreover, the acidic character of the catalysts was not a key factor determining the high conversion of NO. Additionally, we conducted NH3-SCR catalytic tests over the samples after poisoning with sulfur dioxide (SO2). We observed that SO2 affected the catalytic performance mainly in the low-temperature region, due to the deposition of thermally unstable ammonium sulfates.

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Section: Introductionmentioning

confidence: 99%

Catalytic Performance and Sulfur Dioxide Resistance of One-Pot Synthesized Fe-MCM-22 in Selective Catalytic Reduction of Nitrogen Oxides with Ammonia (NH3-SCR)—The Effect of Iron Content

Szymaszek

Díaz

Duraczyńska

et al. 2022

IJMS

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“…Moreover, the binding energy of the peak attributed to Fe 2p 3/2 on the CuFeCo@CuO catalyst increased, which indicated that the outer electron cloud density around Fe 3+ decreased. As a result, the electronegativity of Fe 3+ rose, which in turn increased the reducibility, resulting in an improvement in the catalytic performance. − Besides, both the CuFe@CuO and the CuFeCo@CuO catalysts showed a satellite peak at 718.5 eV, which proved iron oxide (CuFe 2 O 4 spinel) rather than hydroxyl iron. Figure b shows the XPS spectra of Co 2p on the CuFeCo@CuO and CuAlCo@CuO catalysts.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Nanohybrid Spinel@CuO Catalysts for Propane Oxidation: Modified Spinel and Enhanced Activity by Temperature-Dependent Acid Sites

Wang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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Modulating the catalyst electronic structure is a promising direction to enhance the catalytic oxidation performance. Herein, we report an innovative synthesis of the nanohybrid spinel@CuO catalyst with a broad biphasic interface for propane oxidation. The reaction rate of spinel@CuO catalyst was significantly increased compared to the physically mixed spinel+CuO catalyst. Lattice distortions and severe blurring of lattice fringes adjacent to the interface (between the spinel and CuO) comes with the spinel@CuO system, which enhanced interfacial interaction to form defect structures. The cobalt cations were selectively doped into the spinel lattice and occupied both the A and the B sites, while the CuO was not affected. At lower temperatures (∼200 °C), the enrichment of Brønsted acid sites increased the adsorption energy of propane. At higher temperatures (∼350 °C), the A and B sites cobalt weakened the Cu–O bond to make the oxygen vacancies form more readily, thereby enriching the Lewis acid sites. The substitution doping also resulted in lattice distortion in the spinel species, promoting the formation of a defect structure. The broad interface and temperature-dependent acid sites were conducive to propane oxidation.

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“…Using this treatment method, the RM was activated and displayed high deNO x activity between 300 and 400 °C. [106] Wang, et al [107] used acid washing and calcining to create a series of RM catalysts with several other binders. Sulfuric acid and RM were combined with hydrothermal treatment to create an RM-based catalyst, which was then pH adjusted with ammonia.…”

Section: Catalyst Towards Prevalent Air Pollutants Removalmentioning

confidence: 99%

“…Using this treatment method, the RM was activated and displayed high deNO x activity between 300 and 400 °C [106] . Wang, et al [107] . used acid washing and calcining to create a series of RM catalysts with several other binders.…”

Section: Applications Of Rm In Catalysismentioning

confidence: 99%

Characterization and Applications of Red Mud, an Aluminum Industry Waste Material, in the Construction and Building Industries, as well as Catalysis

Al-Fakih

Nor

Basha

et al. 2023

The Chemical Record

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The disposal of red mud (RM), a waste material generated by the aluminum industry, remains a global environmental concern because of its high alkalinity and smaller particle size, which have the potential to pollute air, soil, and water. Recently, efforts have been made to develop a strategy for reusing industrial byproducts, such as RM, and turning waste into value‐added products. The use of RM as (i) a supplementary cementitious material for construction and building materials, such as cement, concrete, bricks, ceramics, and geopolymers, and (ii) a catalyst is discussed in this review. Furthermore, the physical, chemical, mineralogical, structural, and thermal properties of RM, as well as its environmental impact, are also discussed in this review. It is possible to conclude that using RM in catalysis, cement, and construction industries is the most efficient way to recycle this byproduct on a large scale. However, the low cementitious properties of RM can be attributed to a reduction in the fresh and mechanical properties of composites incorporating RM. On the other hand, RM can be used as an efficient active catalyst to synthesize organic molecules and reduce air pollution, which not only makes use of solid waste but also lowers the price of the catalyst. The review provides basic information on the characterization of RM and its suitability in various applications, paving the way for more advanced research on the sustainable disposal of RM waste. Future research perspectives on the utilization of RM are also addressed.

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Acid-pretreated red mud for selective catalytic reduction of NO with NH3: Insights into inhibition mechanism of binders

Cited by 23 publications

References 47 publications

Catalytic Performance and Sulfur Dioxide Resistance of One-Pot Synthesized Fe-MCM-22 in Selective Catalytic Reduction of Nitrogen Oxides with Ammonia (NH3-SCR)—The Effect of Iron Content

Catalytic Performance and Sulfur Dioxide Resistance of One-Pot Synthesized Fe-MCM-22 in Selective Catalytic Reduction of Nitrogen Oxides with Ammonia (NH3-SCR)—The Effect of Iron Content

Fabrication of Nanohybrid Spinel@CuO Catalysts for Propane Oxidation: Modified Spinel and Enhanced Activity by Temperature-Dependent Acid Sites

Characterization and Applications of Red Mud, an Aluminum Industry Waste Material, in the Construction and Building Industries, as well as Catalysis

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