Effect of the Synthesis Method on Alumina Supported Silver Based Catalyst for NO x Selective Reduction by Ethanol

Boutros, Maya; Trichard, Jean-Michel; Costa, Patrick Da

doi:10.1007/s11244-009-9335-9

Cited by 11 publications

(2 citation statements)

References 10 publications

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“…Previous studies have shown that these catalysts are more active for the SCR of NO x using alcohol, as other organic gas reductants exhibit limited NO x abatement without the addition of H 2 in the exhaust stream [3][4][5][6][7][8]. In particular, ethanol (EtOH) has been heavily investigated as a hydrocarbon (HC) reductant for NO x over Ag/Al 2 O 3 due to its prevalence in commercially available gasoline in the United States and its promising NO x reduction activity [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

The selective catalytic reduction of NO over Ag/Al2O3 with isobutanol as the reductant

et al. 2016

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This study investigates the potential of isobutanol (iBuOH) as a reductant for the selective catalytic reduction (SCR) of NOx over 2 wt% Ag/Al 2 O 3 between 150 and 550°C and gas hourly space velocities (GHSV) between 10,000 and 35,000 h -1 . The feed gas consists of 500 ppm NO, 5% H 2 O, 10% O 2 , and 375-1500 ppm iBuOH (C 1 :N ratios of 3-12); additionally, blends of 24 and 48% v/v iBuOH in gasoline are evaluated. Over 90% NO x conversion is achieved between 300 and 400°C using pure iBuOH, including a 40% peak selectivity towards NH 3 that could be utilized in a dual HC/NH 3 -SCR configuration. The iBuOH/gasoline blends are only able to achieve greater than 90% NOx conversion when operated at a GHSV of 10,000 h -1 and employing a C 1 :N ratio of 12. Iso-butyraldehyde and NO 2 appear to function as intermediates in the iBuOH-SCR mechanism, which mirrors the mechanism observed for EtOH-SCR. In general, the performance of iBuOH in the SCR of NOx over a Ag/Al 2 O 3 catalyst is comparable with that of EtOH, although EtOH/gasoline blends display higher NO x reduction than iBuOH/gasoline blends. The key parameter in employing alcohols in SCR appears to be the C-OH:N ratio rather than the C 1 : N ratio.

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Section: Introductionmentioning

confidence: 99%

The selective catalytic reduction of NO over Ag/Al2O3 with isobutanol as the reductant

et al. 2016

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“…Synthesis and a variety of applications of nanoparticles of group IB metal silver have been widely studied due to its relatively low cost. Impregnation of silver salt from its solution on support has remained a common practice to synthesize silver catalysts, i.e., following the incipient wetness impregnation. − Supported nanoparticles offer great potential as catalysts for the synthesis of fine chemicals, and they can contribute to the sustainable development of chemical processes. , Though silver is not the best oxidation catalyst in terms of activity, it can be utilized as an active component of catalysts for some deep or partial oxidation. Ag° is an active species at low temperatures (<140 °C) for oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performance of Silica-Supported Silver Nanoparticles for Liquid-Phase Oxidation of Ethylbenzene

Vadakkekara

Chakraborty

Parikh

2012

Ind. Eng. Chem. Res.

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In this study silver nanoparticles were prepared by chemical reduction method using silver nitrate as metal precursor, starch as protecting agent, and sodium borohydride (NaBH 4 ) as a reducing agent. Formation of silver nanoparticles was monitored using UV−vis absorption spectroscopy and dynamic light scattering (DLS). They were supported on silica by dispersing silica powder in the suspension of destabilized silver nanoparticles. Samples containing different proportions of silver were thus prepared. This method is at variance from the conventionally employed method, i.e., impregnation of silver salt from its solution on support. Ag/SiO 2 samples were characterized by UV−vis absorption spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductive coupled plasma optical emission spectroscopy (ICP-OES), and N 2 adsorption−desorption. Superior catalytic performance of the catalyst prepared by the present method could be observed in a test reaction of ethylbenzene oxidation affording high selectivity to acetophenone as compared to the catalyst prepared by the conventional reported methods. The 5 wt % Ag/SiO 2 catalyst was found not much susceptible to sintering as could be inferred from the comparable performance of the regenerated and fresh catalysts.

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Palladium complex-based catalysts stabilized on mesostructured silica: reactivity in methane combustion

Zribi

Zina

2016

Reac Kinet Mech Cat

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Effect of the Synthesis Method on Alumina Supported Silver Based Catalyst for NO x Selective Reduction by Ethanol

Cited by 11 publications

References 10 publications

The selective catalytic reduction of NO over Ag/Al2O3 with isobutanol as the reductant

The selective catalytic reduction of NO over Ag/Al2O3 with isobutanol as the reductant

Catalytic Performance of Silica-Supported Silver Nanoparticles for Liquid-Phase Oxidation of Ethylbenzene

Palladium complex-based catalysts stabilized on mesostructured silica: reactivity in methane combustion

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