Decomposition of nitric oxide on Pd-mordenite

Oliveira, Andréa Marins de; Baibich, Ione Maluf; Machado, Nádia Regina Camargo Fernandes; Mignoni, Marcelo Luís; Pergher, Sibele B. C.

doi:10.1016/j.cattod.2007.12.100

Cited by 15 publications

(15 citation statements)

References 17 publications

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“…In previous works, we have prepared mono-and bimetallic palladium catalysts using different materials as supports such as alumina [19], MCM-41 [11,12] and zeolite NaY [20]. Furthermore, we have studied mordenite as a support for Pd and Cu catalysts [13,14]. These preliminary results showed that mordenite acts as a promoter maintaining the catalyst active for longer time and being more selective than the other used supports.…”

Section: Introductionmentioning

confidence: 91%

“…Therefore, these materials have been extensively used as inorganic supports for heterogeneous catalysts [15][16][17]. In particular, mordenite is a promising support due to its unique properties such as acidity, unidirectional porous geometry and thermal and hydrothermal stability [8,13,14]. This zeolite has been used as support for Pd catalyst in the NO selective reduction of NO with CH 4 [18].…”

Section: Introductionmentioning

confidence: 99%

“…The selective reduction of NO x using CO [7], CH 4 [8] and C 3 H 6 [9] as reducting agents, and the direct NO decomposition reaction [10][11][12][13][14], represent a suitable alternative for the decomposition of these contaminant gases; in particular the direct NO decomposition since the process does not require a reducing agent. After the finding that a Cu-ZSM-5 catalyst was able to directly decompose NO, the study of different metals and supports has expanded with the ultimate goal of understanding and improving the catalytic performance [6,10].…”

Section: Introductionmentioning

confidence: 99%

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Palladium and Molybdenum Mono and Bimetallic Catalysts on Modernite for Direct NO Decomposition Reaction

et al. 2009

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Palladium and Molybdenum Mono and Bimetallic Catalysts on Modernite for Direct NO Decomposition Reaction

et al. 2009

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“…In a previous study with Pd/zeolite catalysts, the NO decomposition reaction using mordenite prepared in two different forms was evaluated and compared with a catalyst supported on commercial mordenite [8]. Although the samples exhibited similar levels of activity the selectivity was different.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Pd-mordenite Catalysts for NO Decomposition

Oliveira¹,

Costilla²,

Gigola³

et al. 2010

Catal Lett

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The aim of this study was to characterize Pd catalysts supported on three different mordenite zeolites (a commercial sample and two laboratory preparations) previously tested for the NO decomposition reaction. H 2 chemisorption, TPR, FTIR spectroscopy of adsorbed CO and NO, DRS UV-vis and TPD of NO were used to characterize the catalysts. After reduction at 573 K a large fraction of Pd o particles and some Pd 2? ions were found in the commercial sample and one laboratory preparation. In contrast a sample prepared with a mordenite synthesized using a natural clay was found to exhibit mainly ionic Pd. The amount of Pd o (PdO) relative to Pd 2? depends on the oxidation temperature and the metal loading. The catalysts exhibited similar levels of activity for the NO decomposition reaction at 673 K but a different selectivity to N 2 O. This behavior was related to differences in metal dispersion and other surface conditions that influence the formation of PdO particles.

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“…2 In the case of motor vehicles the elimination of these species is usually carried out through its reduction to N 2 using the conventional three-way catalysts which presents Pt, Pd, and Rh in its active phase, [3][4][5] being here a central reaction the NO reduction with CO (NO + CO → 1 2 N 2 + CO 2 ) since these gases are among the main contaminants emitted by the motor vehicles. Furthermore, other catalysts based on noble metals dispersed on a support were also tested for the NO x elimination 6,7 as those based on Ru, 8 Rh, 9 Ir, [10][11][12] Pd, [13][14][15] Pt, [16][17][18][19][20][21][22] Au, [23][24][25][26] Ag, [27][28][29][30] and also on alloys of these metals with cheaper metals. 8,9,20,22,31,32 In some cases the noble metal was successfully replaced by other elements.…”

Section: Introductionmentioning

confidence: 99%

A DFT study of the NO dissociation on gold surfaces doped with transition metals

Fajín

Cordeiro

Gomes

2013

The Journal of Chemical Physics

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The NO dissociation on a series of doped gold surfaces (type TM n @Au(111) or TM n @Au(110), with TM n = Ni, Ir, Rh, or Ag and referring n to the number of dopant atoms per unit cell) was investigated through periodic density functional theory calculations. Generally, doping of Au (111) and Au(110) matrices was found to strengthen the interaction with NO species, with the exception of Ag, and was found to increase the energy barrier for dissociation, with the exception of Ni on Au(111). The calculations suggest that the NO dissociation is only possible in the case of the Ir@Au(110) bimetallic surface but only at high temperatures. The increase of the contents of Ir on Au(110) was found to improve significantly the catalytic activity of gold towards the NO dissociation (E act = ∼1 eV). Nevertheless, this energy barrier is almost the double of that calculated for NO dissociation on pure Ir(110). However, mixing the two most interesting dopant atoms resulted in a catalyst model of the type Ir@Ni(110) that was found to decrease the energy barrier to values close to those calculated for pure Ir surfaces, i.e., ∼0.4 eV, and at the same time the dissociation reaction became mildly exothermic.

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Decomposition of nitric oxide on Pd-mordenite

Cited by 15 publications

References 17 publications

Palladium and Molybdenum Mono and Bimetallic Catalysts on Modernite for Direct NO Decomposition Reaction

Palladium and Molybdenum Mono and Bimetallic Catalysts on Modernite for Direct NO Decomposition Reaction

Characterization of Pd-mordenite Catalysts for NO Decomposition

A DFT study of the NO dissociation on gold surfaces doped with transition metals

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