Facile and template-free fabrication of mesoporous 3D nanosphere-like MnxCo3−xO4 as highly effective catalysts for low temperature SCR of NOx with NH3

Hu, Xiaonan; Huang, Lei; Zhang, Jianping; Li, Hongrui; Zha, Kaiwen; Shi, Liyi; Zhang, Dengsong

doi:10.1039/c7ta08000j

Cited by 124 publications

(59 citation statements)

References 61 publications

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“…Hence, much progress has done to improve the low-temperature SCR activity of transition metal oxides by mixing or doping with other metal oxides. In recent years, Mn, Fe, Co, Ni, and Cu-based binary oxide catalysts have been extensively studied for low-temperature NH 3 -SCR reaction due to their attractive catalytic performance [19,33,[41][42][43][44][45][46][47][48][49]. Particularly, Mn-based binary oxides are popular and proven to be effective catalysts for low-temperature NH 3 -SCR reaction [42,50,51].…”

Section: Binary Transition Metal-based Catalystsmentioning

confidence: 99%

A Review of Low Temperature NH3-SCR for Removal of NOx

et al. 2019

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The importance of the low-temperature selective catalytic reduction (LT-SCR) of NOx by NH3 is increasing due to the recent severe pollution regulations being imposed around the world. Supported and mixed transition metal oxides have been widely investigated for LT-SCR technology. However, these catalytic materials have some drawbacks, especially in terms of catalyst poisoning by H2O or/and SO2. Hence, the development of catalysts for the LT-SCR process is still under active investigation throughout seeking better performance. Extensive research efforts have been made to develop new advanced materials for this technology. This article critically reviews the recent research progress on supported transition and mixed transition metal oxide catalysts for the LT-SCR reaction. The review covered the description of the influence of operating conditions and promoters on the LT-SCR performance. The reaction mechanism, reaction intermediates, and active sites are also discussed in detail using isotopic labelling and in situ FT-IR studies.

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Section: Binary Transition Metal-based Catalystsmentioning

confidence: 99%

A Review of Low Temperature NH3-SCR for Removal of NOx

et al. 2019

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“…The properties of ceria, in turn, are associated with the arrangement of the terminated surface oxygen atoms, which greatly depends on the morphology, structure, and components. Generally, there are two strategies to enhance ceria catalytic activity, including the optimization of ceria morphologies/structures and the combination of ceria with secondary species, such as noble metals or metal oxides, to form composites . For the first strategy, numerous morphologies/structures of ceria have been designed, such as nanorods, nanotubes, nanosheaths, nanobundles, mesoporous, cage bells, and other morphologies/structures .…”

Section: Introductionmentioning

confidence: 99%

The Template‐Free Synthesis of CuO@CeO₂ Nanospheres: Facile Strategy, Structure Optimization, and Enhanced Catalytic Activity toward CO Oxidation

Yuan

Ning

et al. 2018

Eur J Inorg Chem

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The template-free construction of hollow multiporous materials with hierarchically multiporous walls, unique morphologies, and functionalities remains a great challenge in materials science. Here, we describe a facile template-free approach to synthesize hollow multiporous-walled CeO 2 (HMW-CeO 2 ) nanospheres. The HMW-CeO 2 nanosphere possesses a hierarchically multiporous wall, with pore sizes ranging from micropores to mesopores, centered at 0.43, 4.2, and 14.3 nm. The CuO loaded HMW-CeO 2 support (HMW-CuO@CeO 2 ) is eval- [a] Preparation of Ceria Alkoxide Nanospheres: Ceria alkoxide nanospheres were synthesized by mixing Ce(NO 3 ) 3 ·6H 2 O, 2-propanol, and glycerol in a Teflon™-lined stainless-steel autoclave. In a typical synthesis, Ce(NO 3 ) 3 ·6H 2 O (0.868 g) was dissolved in 2-propanol (30 mL) and stirred for 30 min. Glycerol (10 mL) was added to the above solution and stirred for 30 min. The mixture was then transferred into a Teflon™-lined stainless-steel autoclave at 150°C for 8 h. After cooling to room temperature naturally, the precipitate was filtered, washed, and dried at 80°C to obtain ceria alkoxide nanospheres. Preparation of Hollow Multiporous-Walled CeO 2 (HMW-CeO 2 ):HMW-CeO 2 was prepared by the hydrothermal reaction of ceria alkoxide nanospheres. Typically, ceria alkoxide nanospheres (0.5 g) were added to deionized water (30 mL) and stirred for 20 min. The mixture was then transferred into a Teflon™-lined stainless-steel autoclave at 150°C for 3 h. After cooling to room temperature naturally, the precipitate was filtered, washed, and dried at 80°C and calcined at 500°C to obtain HMW-CeO 2 . Preparation of Hollow Multiporous-Walled CuO@CeO 2 (HMW-CuO@CeO 2 ):The HMW-CuO@CeO 2 catalysts with different CuO content (6, 12, 18, 24 mol-%) were prepared using a hydrothermal method. For a typical synthesis of HMW-CuO@CeO 2 (12 mol-%), Cu(CH 3 COO) 2 ·H 2 O (0.139 g) was dissolved in ultrapure water (30 mL) whilst stirring. The as-prepared HMW-CeO 2 was then added to the above solution and stirred for 30 min. The obtained slurry was transferred into a Teflon™-lined stainless-steel autoclave at 120°C for 12 h and was cooled to room temperature naturally. Finally, the precipitate was filtered, washed, and dried at 80°C to obtain HMW-CuO@CeO 2 (12 mol-%). Catalyst CharacterizationPowder X-ray diffraction (XRD) analysis was performed to verify the crystallographic phase of the catalysts present. XRD patterns of the samples were recorded with a Rigaku D/MAX-RB X-ray diffractometer, with a target of Cu-K α , operated at 60 kV and 55 mA, with a scanning speed of 5°min -1 . The 2θ of the wide angle ranged from 20°to 80°and the 2θ of the small angle ranged from 0.6°to 5°.Transmission electron microscopy (TEM) experiments were measured with a JEOL JEM-2010 transmission electron microscope Eur.

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“…24 When x increased to 2, the peak related to Mn 4+ / Mn 3+ shied to lower temperature range (262 C and 234 C), indicating the improvement of reduction properties; this may be caused by increase of high valance manganese species. 25 There was a new peak appeared at $358 C for Ni 2 Mn 4 Ce 4 , and with increasing x, the peak intensity becomes stronger. We certainly ascribed the peak to the reduction of NiO x .…”

Section: Catalytic Performancesmentioning

confidence: 94%

Comparative study of mesoporous Ni_xMn_6−xCe₄ composite oxides for NO catalytic oxidation

Liu

Zhang

et al. 2019

RSC Adv.

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Facile and template-free fabrication of mesoporous 3D nanosphere-like Mn_xCo_3−xO₄ as highly effective catalysts for low temperature SCR of NO_x with NH₃

Abstract: Mesoporous 3D nanosphere-like MnxCo3−xO4 was obtained via a template-free method. The formation mechanism was proposed and the synthesis conditions were carefully investigated. The operating temperature window was 75–325 °C when the NOx conversion was above 80%.

Cited by 124 publications

References 61 publications

A Review of Low Temperature NH3-SCR for Removal of NOx

A Review of Low Temperature NH3-SCR for Removal of NOx

The Template‐Free Synthesis of CuO@CeO₂ Nanospheres: Facile Strategy, Structure Optimization, and Enhanced Catalytic Activity toward CO Oxidation

Comparative study of mesoporous Ni_xMn_6−xCe₄ composite oxides for NO catalytic oxidation

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Facile and template-free fabrication of mesoporous 3D nanosphere-like MnxCo3−xO4 as highly effective catalysts for low temperature SCR of NOx with NH3

Abstract: Mesoporous 3D nanosphere-like MnxCo3−xO4 was obtained via a template-free method. The formation mechanism was proposed and the synthesis conditions were carefully investigated. The operating temperature window was 75–325 °C when the NOx conversion was above 80%.

Cited by 124 publications

References 61 publications

A Review of Low Temperature NH3-SCR for Removal of NOx

A Review of Low Temperature NH3-SCR for Removal of NOx

The Template‐Free Synthesis of CuO@CeO2 Nanospheres: Facile Strategy, Structure Optimization, and Enhanced Catalytic Activity toward CO Oxidation

Comparative study of mesoporous NixMn6−xCe4 composite oxides for NO catalytic oxidation

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Facile and template-free fabrication of mesoporous 3D nanosphere-like Mn_xCo_3−xO₄ as highly effective catalysts for low temperature SCR of NO_x with NH₃

The Template‐Free Synthesis of CuO@CeO₂ Nanospheres: Facile Strategy, Structure Optimization, and Enhanced Catalytic Activity toward CO Oxidation

Comparative study of mesoporous Ni_xMn_6−xCe₄ composite oxides for NO catalytic oxidation