Insights into the influence of the Ag loading on Al2O3 in the H2-assisted C3H6-SCR of NO

Chaieb, Tesnim; Delannoy, Laurent; Costentin, Guylène; Louis, Catherine; Casale, Sandra; Chantry, Ruth L.; Li, Ziyou; Thomas, Cyril

doi:10.1016/j.apcatb.2014.03.025

Cited by 32 publications

(30 citation statements)

References 49 publications

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“…The Ag/Al2O3 catalyst containing 2 wt.% Ag was prepared by wet-impregnation of commercial γ-Al2O3 (Alfa Aesar, surface area 255 m 2 .g -1 ) with an aqueous solution of AgNO3 [36]. The precursor solution of the catalyst was dried overnight at 110 °C and calcined at 500 °C for 1 h.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Yadav

Thakur

et al. 2017

Bull. Chem. React. Eng. Catal.

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Hydrocarbon-Selective catalytic reduction (HC-SCR) is one of the potential methods to remove NOx emissions from diesel engine, lean burn petrol engines and natural gas engines exhaust. Ag/Al2O3 is a good catalyst for HC-SCR of NOx under lean-burn conditions. Further, addition of small amount of H2 is effective for enhancing HC-SCR activity. This effect is unique to silver and to specific Ag/support combinations, namely, Ag/γ-Al2O3. Various HC reductants, such as: octane, decane, dodecane and propane, have been reported in the literatures. Only a single study on LPG as a reductant over Cu-ZSM catalyst was reported. There was no work reported on H2 assisted LPG over Ag/Al2O3 catalyst. Thus, this gap in the literature is filled with the present investigation of NO reduction over 2 wt.% Ag/Al2O3 catalyst using LPG reductant. The fresh and used catalyst was characterized by various techniques like low temperature N2-adsorption, XRD, XPS and SEM. There was practically no change in the characteristics of the fresh and used catalyst. Two different reductants of CO and LPG were compared for SCR of NO over the catalyst without and with H2-assisted. The experiments were performed in a fixed bed tubular flow reactor under the following conditions: 100mg catalyst; 0.13% NO, 2.5% LPG/CO, 1% H2, 10% O2, rest Ar; total flow rate 60 mL/min; temperature ambient 400 o C and pressure 1 atm. Around 100% conversion of NO was achieved using LPG reductant. Light off temperature of NO reduction significantly reduced by H2assisted LPG reductant. The maximum conversion of NO with CO was limited to 35.15% at temperature of 224 o C and above. Whereas, 97.79 % NO conversion was achieved at 365 o C with LPG reductant. While, the maximum conversions with H2-LPG and H2-CO reductants were 100 and 99.46% at 117 and 220 o C, respectively. Therefore, H2-LPG-SCR of NOx over 2 wt.% Ag/Al2O3 catalyst system can be used to get 100% reduction at low temperature.

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Section: Catalyst Preparationmentioning

confidence: 99%

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Yadav

Thakur

et al. 2017

Bull. Chem. React. Eng. Catal.

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“…This shift to lower temperature was much less pronounced than that found on Ag/Al2O3 catalysts under similar experimental conditions. 8 The 25 conversion of H2 is also shown in Fig. 2b.…”

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confidence: 86%

“…21 The N2 turnover rates were estimated at 250 °C, as we reported previously that the contribution of the bare Al2O3 support was negligible for temperatures lower than or equal to 250 °C. 8 Table 1 lists the conversions of NOx, C3H6 and H2 together with the corresponding 25 data required for the estimation of the N2 turnover rates for the Au/Al2O3 sample investigated in the present work and for a Ag/Al2O3 sample studied previously. 8 It can be seen that the N2 turnover rates are close to each other, differing by less than one order of magnitude, on Au and Ag sites supported on Al2O3.…”

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confidence: 99%

Evidence for an H₂promoting effect in the selective catalytic reduction of NO_xby propene on Au/Al₂O₃

et al. 2015

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“…After introducing water vapor, especially at low temperature, the conversion of NO x was enhanced. Chaieb et al [205] studied the reaction mechanism of H 2 assisting C 3 H 6 to remove NO x on Ag-loaded Al 2 O 3 surface (Figure 13a). When the Ag-loaded density reached 0.7Ag/nm 2 Al 2 O 3 , the contact process between NO and C 3 H 6 was the decisive step of C 3 H 6 -SCR process (Figure 13b).…”

Section: Hc-scrmentioning

confidence: 99%

“…Catalysts 2019, 9, x FOR PEER REVIEW 21 of 40 Figure 13. (a) The mechanism of C3H6 selective catalytic NO removal on Ag/Al2O3 surface, (b) the effect of Ag loading on NO conversion [205], and (c,d) the effect of Fe doping on the sulfur resistance and water resistance of Ag/Al2O3 catalyst [206]. Reproduced from Ref.…”

Section: Hc-scrmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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Insights into the influence of the Ag loading on Al2O3 in the H2-assisted C3H6-SCR of NO

Cited by 32 publications

References 49 publications

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Evidence for an H₂promoting effect in the selective catalytic reduction of NO_xby propene on Au/Al₂O₃

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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Insights into the influence of the Ag loading on Al2O3 in the H2-assisted C3H6-SCR of NO

Cited by 32 publications

References 49 publications

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Evidence for an H2promoting effect in the selective catalytic reduction of NOxby propene on Au/Al2O3

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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Evidence for an H₂promoting effect in the selective catalytic reduction of NO_xby propene on Au/Al₂O₃