Synthesis of three-dimensionally ordered macroporous Al–Ce mixed oxide catalysts with high catalytic activity and stability for diesel soot combustion

Jin, Baofang; Wei, Yuechang; Zhang, Zhao; Liu, Jian; Yu, Xin; Li, Yazhao; Li, Jianmei

doi:10.1016/j.cattod.2015.01.021

Cited by 32 publications

(10 citation statements)

References 51 publications

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“…Ceria-based 3DOM catalysts have demonstrated improved diesel soot combustion activity with regards to disordered counterparts, and this improvement has been attributed to the enhanced solid-solid contact between the soot and catalyst particles [1][2][3][4][5]. The same argument has been appealed to explain, for instance, the high soot combustion activity of 3DOM cobalt-based perovskites [6].…”

Section: Introductionmentioning

confidence: 79%

Improved CO Oxidation Activity of 3DOM Pr-Doped Ceria Catalysts: Something Other Than an Ordered Macroporous Structure

et al. 2017

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Abstract:It is demonstrated that the synthesis procedure for preparing three-dimensionally ordered macroporous (3DOM) Pr-doped ceria catalysts using a polymethylmethacrylate (PMMA) template not only affects the porous structure, but also the chemistry of the ceria surface. The PMMA template does not affect the crystalline features (type of phases, crystallite size, and cell parameter) of Pr-doped ceria, Ce and Pr location into the particles, and the bulk reduction of the Ce-Pr mixed oxide catalysts. On the contrary, the utilization of the PMMA template improves both the porosity and surface redox properties. 3DOM Ce-Pr mixed oxide catalysts combine micro, meso, and macropores, the most area being in the macropore range, while a reference unshaped catalyst presents poor porosity in all ranges. However, the catalyzed CO oxidation rates do not correlate with the surface area of the catalysts (neither micro nor meso/macro). The Ce-Pr-3DOM catalyst also presents improved surface reducibility with regards to the counterpart reference material prepared without the template, and improved redox behavior under reaction conditions; that is, it has a higher area and this area is reduced and reoxidized more easily. X-ray photoelectron spectroscopy analysis evidences that this is mainly attributed to praseodymium cations, which accomplish redox cycles more easily than cerium cations.

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Section: Introductionmentioning

confidence: 79%

Improved CO Oxidation Activity of 3DOM Pr-Doped Ceria Catalysts: Something Other Than an Ordered Macroporous Structure

et al. 2017

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“…To simplify the exhaust post-treatment system, it is of significance to achieve the simultaneous elimination of soot particles and NO x . 3DOM catalysts have been demonstrated to be effective on the soot catalytic combustion because the suitable pore size (>25 nm) are favorable for the transfer and diffusion of soot particles and the full usage of active sites of the catalysts. − We developed a series of Fe, Cu, Mn, and Co doped Ce–Zr-based 3DOM catalysts for NH 3 –SCR reaction, which exhibited excellent LT activity . In recent years, increasing efforts have been made on the simultaneous removal of soot particulates and NO x from diesel engine exhausts.…”

Section: Metal Oxide Catalystsmentioning

confidence: 99%

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

et al. 2019

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Selective catalytic reduction with NH 3 (NH 3 −SCR) is the most efficient technology to reduce the emission of nitrogen oxides (NO x ) from coal-fired industries, diesel engines, etc. Although V 2 O 5 −WO 3 (MoO 3 )/TiO 2 and CHA structured zeolite catalysts have been utilized in commercial applications, the increasing requirements for broad working temperature window, strong SO 2 /alkali/heavy metal-resistance, and high hydrothermal stability have stimulated the development of new-type NH 3 −SCR catalysts. This review summarizes the latest SCR reaction mechanisms and emerging poisonresistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VO x , MnO x , CeO 2 , and Fe 2 O 3 to CuO based catalysts; acidic compound catalysts containing vanadate, phosphate and sulfate catalysts; ion exchanged zeolite catalysts such as Fe, Cu, Mn, etc. exchanged zeolite catalysts; monolith catalysts including extruded, washcoated, and metal-mesh/foam-based monolith catalysts. The challenges and opportunities for each type of catalysts are proposed while the effective strategies are summarized for enhancing the acidity/redox circle and poison-resistance through modification, creating novel nanostructures, exposing specific crystalline planes, constructing protective/sacrificial sites, etc. Some suggestions are given about future research directions that efforts should be made in. Hopefully, this review can bridge the gap between newly developed catalysts and practical requirements to realize their commercial applications in the near future.

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“…We realize that the synthesized bimodal porous 6 100 % of toluene or xylene and 78 % of benzene could be removed at 250 o C and SV = 8,400 mL/(g h)). Jin et al[31] prepared 3DOM Al-Ce mixed oxide catalysts using the colloidal crystal templating method, and observed that the 3DOM-structued materials showed higher catalytic activity than the disordered macroporous counterpart for soot combustion. Herein, we report the preparation, characterization,and catalytic properties of xM/3DOM yCeO 2 −Al 2 O 3 (x = 0.27−0.81 wt%; y = 8.8−26.9 wt%; M = Au, Ag, Pd, Pt) for toluene oxidation.…”

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confidence: 99%

Preparation and catalytic performance of Ag, Au, Pd or Pt nanoparticles supported on 3DOM CeO2–Al2O3 for toluene oxidation

Yang

Deng

Liu

et al. 2016

Journal of Molecular Catalysis A: Chemical

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Three-dimensionally ordered macro-/mesoporous 26.9 wt% CeO 2 −Al 2 O 3 (denoted as 3DOM 26.9CeO 2 −Al 2 O 3 )-supported noble metal nanocatalysts (xM/3DOM 26.9CeO 2 −Al 2 O 3 , x = 0.27−0.81 wt%; M = Au, Ag, Pd, and Pt) were prepared using the polymethyl methacrylate-templating and polyvinyl alcohol-protected reduction methods, respectively. It is shown that the xM/3DOM 26.9CeO 2 −Al 2 O 3 samples displayed a high-quality 3DOM architecture with a bimodal pore (macropore size = 180-200 nm and mesopore size = 4-6 nm) structure and a surface area of 102−108 m 2 /g, with the noble metal nanoparticles (3-4 nm in size) being highly dispersed on the 3DOM 26.9CeO 2 −Al 2 O 3 surface. The 0.27Pt/3DOM 26.9CeO 2 −Al 2 O 3 sample performed the best (T 90% = 198 o C at space velocity = 20,000 mL/(g h)) for toluene oxidation. The addition of moisture to the feedstock induced a positive effect on catalytic activity. The apparent activation energies obtained over the xM/3DOM 26.9CeO 2 −Al 2 O 3 samples were in the range of 46-100 kJ/mol, with the 0.27Pt/3DOM 26.9CeO 2 −Al 2 O 3 sample possessing the lowest apparent activation energy. It is concluded that the good catalytic performance of 0.27Pt/3DOM 26.9CeO 2 −Al 2 O 3 was associated with its higher adsorbed oxygen species concentration, better low-temperature reducibility, and stronger interaction between Pt and 3DOM 26.9CeO 2 −Al 2 O 3 as well as the unique bimodal porous structure.

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Synthesis of three-dimensionally ordered macroporous Al–Ce mixed oxide catalysts with high catalytic activity and stability for diesel soot combustion

Cited by 32 publications

References 51 publications

Improved CO Oxidation Activity of 3DOM Pr-Doped Ceria Catalysts: Something Other Than an Ordered Macroporous Structure

Improved CO Oxidation Activity of 3DOM Pr-Doped Ceria Catalysts: Something Other Than an Ordered Macroporous Structure

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

Preparation and catalytic performance of Ag, Au, Pd or Pt nanoparticles supported on 3DOM CeO2–Al2O3 for toluene oxidation

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Synthesis of three-dimensionally ordered macroporous Al–Ce mixed oxide catalysts with high catalytic activity and stability for diesel soot combustion

Cited by 32 publications

References 51 publications

Improved CO Oxidation Activity of 3DOM Pr-Doped Ceria Catalysts: Something Other Than an Ordered Macroporous Structure

Improved CO Oxidation Activity of 3DOM Pr-Doped Ceria Catalysts: Something Other Than an Ordered Macroporous Structure

Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects

Preparation and catalytic performance of Ag, Au, Pd or Pt nanoparticles supported on 3DOM CeO2–Al2O3 for toluene oxidation

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Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects