Towards a single brick solution for the abatement of NOx and soot from diesel engine exhausts

Mescia, Davide; Caroca, Jose Carlos; Russo, Nunzio; Labhsetwar, Nitin; Fino, Debora; Saracco, Guido; Specchia, Vito

doi:10.1016/j.cattod.2007.11.010

Cited by 36 publications

(26 citation statements)

References 13 publications

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“…In situ solution combustion synthesis [4,[108][109][110][111][112][113][114][115][116] seems to be a good alternative to the previously described procedures. It allows the production of a well-adhered and porous perovskite layer in a reduced number of steps.…”

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

“…After being dipped into an aqueous solution containing nitrate precursors (oxidant), urea (fuel) and ammonium nitrate (combustion booster), the structured carrier is placed in an oven at 600-650 °C. This rapidly brings the aqueous phase to boil and the precursor mixture to ignite: within few minutes, the heat released by urea combustion allows the transformation of the nitrate precursors into a phase pure perovskite-type oxide [4,[108][109][110][111]. The generation of large amounts of gaseous products in a very short period of time during the combustion produces a 40-100 μm thick, highly porous and spongy coating (Figure 10b) with high SSA (4-30 m 2 •g −1 ) [4,[108][109][110]112,113].…”

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

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Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

et al. 2014

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Automotive Three-Way Catalysts (TWC) were introduced more than 40 years ago. Despite that, the development of a sustainable TWC still remains a critical research topic owing to the increasingly stringent emission regulations together with the price and scarcity of precious metals. Among other material classes, perovskite-type oxides are known to be valuable alternatives to conventionally used TWC compositions and have demonstrated to be suitable for a wide range of automotive applications, ranging from TWC to Diesel Oxidation Catalysts (DOC), from NO x Storage Reduction catalysts (NSR) to soot combustion catalysts. The interest in these catalysts has been revitalized in the past ten years by the introduction of the concept of catalyst regenerability of perovskite-based TWC, which is in principle well applicable to other catalytic processes as well, and by the possibility to reduce the amounts of critical elements, such as precious metals without seriously lowering the catalytic performance. The aim of this review is to show that perovskite-type oxides have the potential to fulfil the requirements (high activity, stability, and possibility to be included into structured catalysts) for implementation in TWC.

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Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

et al. 2014

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“…2%Au), selected among the most active catalysts tested in previous papers by the authors [7,8], was prepared via the ''Solution Combustion Synthesis'' (SCS) method [9]. The catalyst was then calcined in air at 500°C for 4 h as a common stabilisation treatment to obtain a crystallized phase (see Fig.…”

Section: Catalyst Preparation and Activity Test On Powdermentioning

confidence: 99%

“…The catalyst was then calcined in air at 500°C for 4 h as a common stabilisation treatment to obtain a crystallized phase (see Fig. 1 in [7]). The prepared catalyst was then ground in a ball mill at room temperature, fully characterized via Field Emission Scanning Electron Microscope (FESEM), X-Ray Diffraction (XRD), BET, Atomic Absorption Spectroscopy (AAS) and tested in a Temperature Programmed Reaction apparatus (TPR) following a standard procedure [7,8].…”

Section: Catalyst Preparation and Activity Test On Powdermentioning

confidence: 99%

Comparison of Different Diesel Particulate Filters

et al. 2009

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The present investigation concerns the development of a catalytic wall-flow trap for the simultaneous removal of particulate, CO and marginally for NO x . Three different geometries (200/17, 300/12, and 300/12-HAC) of commercial SiC filters were catalyzed with a nanostructured perovskite catalyst (La-K-Cu-FeO 3 ? 2%Au) via the in situ Solution Combustion Synthesis method, and tested on real diesel exhaust gases on a commercial vehicle engine bench. The pros and cons of all the filters were evaluated on the ground of numerous loading and regeneration cycles. In all filter geometries tested, the La-K-CuFeO 3 ? 2%Au catalyst entails a much more complete regeneration and lower fuel penalties compared to those of a non catalytic trap.

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“…together with chemical and thermal stability. Doped lanthanum ferrites are widely studied for use in catalysis [1][2][3][4], as cathode materials for solid oxide fuel cells (SOFCs) [5][6][7][8] and in chemical sensors applications [9][10]. Dann et al [11] studied the La 1-x Sr x FeO 3-w system using neutron powder diffraction measurements and Mössbauer spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Charge compensation and magnetic properties in Sr and Cu doped La-Fe perovskites

Sora

Caronna

Fontana

et al. 2013

EPJ Web of Conferences

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Abstract. Orthorhombic lanthanum orthoferrites La 0.8 Sr 0.2 Fe 1-y Cu y O 3-w (y = 0 and 0.10) have been studied using X-rays and neutron powder diffraction (XRPD and NPD), magnetization measurements and 57 Fe Mössbauer spectroscopy. Rietveld refinements on XRPD and NPD data show that they adopt an orthorhombic ABO 3 perovskite symmetry with La/Sr and Fe/Cu atoms randomly distributed on crystal A and B sites, respectively. The magnetic structure at room temperature is antiferromagnetic, with the Fe/Cu magnetic moments aligned along the a axis. Magnetization curves versus temperature show that the compounds exhibit an overall antiferromagnetic and a weak ferromagnetic behaviour in the range 5-298 K. 57 Fe Mössbauer spectroscopy measurements indicate that Fe 3+ and Fe 5+ ions coexist in both compounds, and the relative percentage of Fe 5+ is almost the same at 77 and 170 K, rejecting a charge disproportion mechanism.

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Towards a single brick solution for the abatement of NOx and soot from diesel engine exhausts

Cited by 36 publications

References 13 publications

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

Comparison of Different Diesel Particulate Filters

Charge compensation and magnetic properties in Sr and Cu doped La-Fe perovskites

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