Sol-gel Ag + Pd/SiO2 as a catalyst for reduction of NO with CO

Radev, Lachezar; Христова, M.; Mehandjiev, D.; Samuneva, B.

doi:10.1007/s10562-006-0200-1

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…Similar results are obtained in the study of NO reduction by CO over an Ag+Pd/SiO 2 catalyst [15]. The presence of two forms of NO adsorption on Pd doped samples indicates that different catalytically active sites are probably formed at the surface, which are responsible for the reduction of NO and the decomposition of NO.…”

Section: Discussionsupporting

confidence: 83%

“…In our recent study [15] we established that the Ag+Pd/SiO 2 catalyst showed a high activity in NO reduction with CO and direct decomposition of NO.The presence PdO in these catalysts allows the elimination of NO. The process of this elimination includes reduction of NO with CO at temperatures up to 200 o C as well as direct decomposition of NO at higher temperatures.…”

Section: Introductionmentioning

confidence: 97%

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Catalytic reduction of NO by CO over Pd — doped Perovskite-type catalysts

Христова

Petrović²,

Terlecki-Baricevic³

et al. 2009

Open Chemistry

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Abstract:The perovskite type oxides (nominal formula LaTi 0.5 Mg 0.5 O 3 ) with addition of Pd were prepared by annealing the ethanol solution of precursors in nitrogen flow at 1200°C and characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption of NO (NO-TPD). Their activity was evaluated for NO reduction by CO under stoichiometric and oxidizing conditions and for direct decomposition of NO. Pd substituted samples exhibited high NO reduction activity and selectivity towards N 2 . Nearly complete elimination of NO was achieved at 200°C. Two simultaneous reactions, NO reduction by CO and direct decomposition of NO as well as two forms of NO adsorption were observed on the surface of Pd substituted perovskite samples. The distribution of Pd in different catalytically active sites or complexes on at the catalyst surface may be responsible for the proceeding of two reactions: NO reduction with CO and direct NO decomposition.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 97%

Catalytic reduction of NO by CO over Pd — doped Perovskite-type catalysts

Христова

Petrović²,

Terlecki-Baricevic³

et al. 2009

Open Chemistry

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“…Because the desorption temperature of NO and C 3 H 6 are different, NO cannot react directly with C 3 H 6 . Since CO and N 2 O are released at the same temperature range and NO can be readily reduced by CO [36,37,38], NO is likely to be partially reduced to N 2 O by CO, and further reduced to N 2 , of which the formation is not capable of being measured under the conditions adopted.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Si/Al Ratios on Adsorption and Desorption Characterizations of Pd/Beta Served as Cold-Start Catalysts

Jiang

Wang

et al. 2019

Materials

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: The majority of NOx is exhausted during the cold-start period for the low temperature of vehicle emissions, which can be solved by using Pd/zeolite catalysts to trap NOx at low temperature and release NOx at a high temperature that must be higher than the operating temperature of selective catalytic reduction catalysts (SCR). In this work, several Pd/Beta catalysts were prepared to identify the influence of Si/Al ratios on NO and C3H6 adsorption and desorption characterizations. The physicochemical properties were identified using N2 physical adsorption, Fourier Transform Infrared Spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photo electron spectroscopy (XPS), and Na+ titration, while the adsorption and desorption characterizations were investigated by catalyst evaluation. The results indicated that the amount of dispersed Pd ions, the main active sites for NO and C3H6 adsorption, decreased with the increase of Si/Al ratios. Besides this, the intensity of Brønsted and Lewis acid decreased with the increase of Si/Al ratios, which also led to the decrease of NO and C3H6 adsorption amounts. Therefore, Pd dispersion and the acidic properties of Pd/Beta together determined the adsorption ability of NO and C3H6. Moreover, lower Si/Al ratios resulted in the formation of an additional dispersed Pd cationic species, Pd(OH)+, from which adsorbed NO released at a much lower temperature. Finally, an optimum Si/Al ratio of Pd/Beta was found at around 55 due to the balanced performance between the adsorption amounts and desorption temperature.

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“…Silver has recently gained much interest for lowtemperature NO x reduction [29] and CO oxidation [30]. Thus, it could be a suitable catalyst for many redox reactions like VOC oxidation.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ag–M (M: Fe, Co and Mn)–ZSM‐5 bimetal catalysts with high performance for catalytic oxidation of ethyl acetate

Jodaei

Salari

Niaei

et al. 2011

Environmental Technology

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The catalytic combustion of ethyl acetate has been investigated in a series of mono-metal silver and bimetal Ag-M (M: Fe, Co and Mn)-modified HZSM-5 zeolites. The objective was to find a catalyst with high superior activity, selectivity towards deep oxidation product and stability. The catalyst activity was measured under excess oxygen condition in a fixed bed reactor operated at gas hourly space velocity (GHSV) = 30000 h(-1), reaction temperature between 150 and 450 degrees C and ethyl acetate inlet concentration of 1000 ppm. Both Fe-Ag-ZSM-5 and Co-Ag-ZSM-5 catalysts exhibited high activity in the oxidation of ethyl acetate. The sequences of catalytic activity and catalytic stability were as follows: Fe-Ag-ZSM-5 > Co-Ag-ZSM-5 > Mn-Ag-ZSM-5 > Ag-ZSM-5 > HZSM-5. Total conversion of ethyl acetate was achieved at above 250 degrees C. The catalysts were characterized by inductively coupled plasma atomic emission spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy.

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Sol-gel Ag + Pd/SiO2 as a catalyst for reduction of NO with CO

Cited by 15 publications

References 29 publications

Catalytic reduction of NO by CO over Pd — doped Perovskite-type catalysts

Catalytic reduction of NO by CO over Pd — doped Perovskite-type catalysts

The Influence of Si/Al Ratios on Adsorption and Desorption Characterizations of Pd/Beta Served as Cold-Start Catalysts

Preparation of Ag–M (M: Fe, Co and Mn)–ZSM‐5 bimetal catalysts with high performance for catalytic oxidation of ethyl acetate

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