Me (Cu, Co, V)-K/Al2O3 supported catalysts for the simultaneous removal of soot and nitrogen oxides from diesel exhausts

Gálvez, María Elena; Ascaso, Sonia; Moliner, R.; Lázaro, M.J.

doi:10.1016/j.ces.2012.10.001

Cited by 23 publications

(17 citation statements)

References 59 publications

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“…Adsorption of NO x from the gas phase takes place simultaneously, being the cause of the positive values registered within the low temperature reaction interval. At temperatures higher than 400°C these NO x desorb and react with the carbon black deposited on the catalyst surface, activating its oxidation through a mechanism described in detail in [9]. Correspondingly, the catalyst that is more prompt to adsorb nitrogen species, i.e.…”

Section: Activity In the Simultaneous Removal Of Sootmentioning

confidence: 96%

“…Fe-K/D20, shows the fastest carbon black oxidation rate, resulting in 100 % conversion at 650°C. Potassium mobility and its diffusion through the larger pores in the catalytic layer is clearly playing a role, Top Catal pointing to the huge importance of the catalyst's textural properties and of the morphology of the deposited layer [7,[9][10][11]. NO x conversion is activated upon calcination of the catalyst at a higher temperature, i.e.…”

Section: Activity In the Simultaneous Removal Of Sootmentioning

confidence: 99%

“…We have recently reported considerable activity in the simultaneously removal of soot and NO x at intermediate temperatures (400-550°C), for alumina-based catalytic systems supported over cordierite monoliths [9][10][11][12]. The type of metal precursor [9], the alkali promoter [10], the textural features of the catalytic layer [11] as well as the chemical state of the different active species [12] strongly determines the activity, selectivity and stability of the prepared catalysts.…”

Section: Introductionmentioning

confidence: 97%

“…The type of metal precursor [9], the alkali promoter [10], the textural features of the catalytic layer [11] as well as the chemical state of the different active species [12] strongly determines the activity, selectivity and stability of the prepared catalysts. In a previous paper [13] we introduce already Fe as a possible active phase substituting either Co or noble metals.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Alumina Precursor on the Activity of Structured Fe–K/Al2O3 Catalysts Towards the Simultaneous Removal of Soot and NOx

et al. 2016

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Fe-K/Al 2 O 3 catalysts supported on cordierite monoliths were prepared using four washcoating suspensions containing different dispersible boehmites. The influence of the inherent properties of these alumina precursors on the textural properties, morphology and mechanical integrity of the catalytic layer were studied together with the activity of the monolithic catalyst in the simultaneous removal of soot and NO x . The textural and structural properties of the washcoat strongly determine the mobility of potassium species and therefore the activity of the different catalyst prepared. Calcination at 650°C and complete removal of such mobile potassium nitrate species results in similar activity that no longer depends on the textural and morphological properties of the catalytic layer, determined by the type of alumina precursor used.

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Section: Activity In the Simultaneous Removal Of Sootmentioning

confidence: 96%

Section: Activity In the Simultaneous Removal Of Sootmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the Alumina Precursor on the Activity of Structured Fe–K/Al2O3 Catalysts Towards the Simultaneous Removal of Soot and NOx

et al. 2016

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“…Therefore, the need to explore PGM free catalyst with transition metals is of global research prominence. Transition metal oxide-based catalysts are inexpensive, resistant to poisoning and higher active surface area compared to noble metal oxides [13]. Consequently, transition metal oxides have been intensively studied to discover more economical and effective catalysts for low-temperature SCR of NOx.…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts

Yadav

Kavaiya

Mohan

et al. 2017

Bull. Chem. React. Eng. Catal.

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The 15 mol% Cu/Al2O3 catalysts with different Mn doping (0.5, 1.0, 1.5, mol%) were prepared using PEG-300 surfactant following evaporation-induced self-assembly (EISA) method. Calcination of precursors were performed in flowing air conditions at 500 ºC. The catalysts were characterized by X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infra Red (FTIR), and N2 physisorption. The catalysts activities were evaluated for H2 assisted LPG-SCR of NO in a packed bed tubular flow reactor with 200 mg catalyst under the following conditions: 500 ppm NO, 8 % O2, 1000 ppm LPG, 1 % H2 in Ar with total flow rate of 100 mL/min. Characterization of the catalysts revealed that surface area of 45.6-50.3 m 2 /g, narrow pore size distribution (1-2 nm), nano-size crystallites, Cu 2+ and Mn 2+ phases were principal active components. Hydrogen enhanced significantly selective reduction of NO to N2 with LPG over 1.0 mol % Mn-Cu/Al2O3 giving 95.56 % NO reduction at 150 ºC. It was proposed that the synergistic interaction between H2 and LPG substantially widened the NO reduction temperature window and a considerable increase in both activity and selectivity. Negligible loss of catalyst activity was observed for the 50 h of stream on run experiment at 150 ºC. The narrow pore size distribution, thermal stability of the catalyst and optimum Mn doping ensures good dispersion of Cu and Mn over Al2O3 that improved NO reduction in H2-LPG SCR system.

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Experimental investigation on the influence of the presence of alkali compounds on the performance of a commercial Pt–Pd/Al2O3 diesel oxidation catalyst

Xie

Gálvez

Matynia

et al. 2017

Clean Techn Environ Policy

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Me (Cu, Co, V)-K/Al2O3 supported catalysts for the simultaneous removal of soot and nitrogen oxides from diesel exhausts

Cited by 23 publications

References 59 publications

Influence of the Alumina Precursor on the Activity of Structured Fe–K/Al2O3 Catalysts Towards the Simultaneous Removal of Soot and NOx

Influence of the Alumina Precursor on the Activity of Structured Fe–K/Al2O3 Catalysts Towards the Simultaneous Removal of Soot and NOx

Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts

Experimental investigation on the influence of the presence of alkali compounds on the performance of a commercial Pt–Pd/Al2O3 diesel oxidation catalyst

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