Cu exchanged microporous titanium silicalite (TS-1) coated on polycrystalline mullite fibres as catalyst for the CO and NO conversion

Petrov, L.; Soria, J.; Dimitrov, L.; Cataluña, Renato; Spasov, L.; Dimitrov, Philip

doi:10.1016/0926-3373(95)00038-0

Cited by 22 publications

(11 citation statements)

References 59 publications

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“…This is similar to the case of NO dissociation reported earlier where the presence of bimetallic sites has a promoter effect. 22 Consequently, it is possible to claim that the good performance of bimetallic RhCu for NO reduction by CO, compared to pure Rh, reported by Petrov et al 19 is due to the higher activity of the bimetallic system towards both NO dissociation and CO oxidation.…”

Section: Discussionmentioning

confidence: 94%

“…18 Other more economic choices suggested in the literature involve the bimetallic RhCu system which has been proposed because, at least under laboratory conditions, a RhCu catalyst exhibits better performance than industrial Rh containing catalysts for exhaust gas treatment in both CO oxidation and NO reduction reactions. 19,20 This behavior has been attributed to the increasing ability to store atomic adsorbed oxygen due to presence of Cu in the surface and to an increased resistance upon sintering. 21 However, the information concerning the properties and reactivity of RhCu surfaces, either experimental or from computational models, is more scarce although recent work evidences that the presence of Cu on Rh surfaces enhances its activity towards NO dissociation by lowering the corresponding energy barrier.…”

Section: Introductionmentioning

confidence: 99%

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Similarities and differences on the molecular mechanism of CO oxidation on Rh(111) and bimetallic RhCu(111) surfaces

González

Sousa

Illas

2007

Phys. Chem. Chem. Phys.

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The reaction between adsorbed CO and atomic O on various sites of Rh(111) and on the bimetallic RhCu(111) surface has been investigated by first principles density functional theory using slab models. The most likely reaction pathway for CO oxidation on Rh(111) involves probably migration of atomic oxygen from fcc to hcp sites. On the bimetallic surface the mechanism is similar, although depending on the type of bimetallic site a reduction of the energy barrier is predicted. Consequences for the NO reduction by CO reaction are analyzed.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Similarities and differences on the molecular mechanism of CO oxidation on Rh(111) and bimetallic RhCu(111) surfaces

González

Sousa

Illas

2007

Phys. Chem. Chem. Phys.

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“…The nature of copper cation interactions with the Ti-zeolite framework is much more complex. Part of the ≡Si-O-Ti≡ bridges can be hydrolyzed under treatment with the aqueous solution of copper salt with the formation of weakly acidic ≡Si-OH and ≡Ti-OH, that can act as ion-exchange sites [32]. Moreover, copper can be attached to ≡Si-O-Ti≡ bridges as a surface complex [32].…”

Section: H 2 -Tprmentioning

confidence: 99%

“…Part of the ≡Si-O-Ti≡ bridges can be hydrolyzed under treatment with the aqueous solution of copper salt with the formation of weakly acidic ≡Si-OH and ≡Ti-OH, that can act as ion-exchange sites [32]. Moreover, copper can be attached to ≡Si-O-Ti≡ bridges as a surface complex [32]. In these cases, copper is attached into the zeolite framework by weaker forces and therefore aggregation of copper species under calcination conditions is much easier compared to Al-zeolites.…”

Section: H 2 -Tprmentioning

confidence: 99%

Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

et al. 2020

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Ferrierites and their delaminated forms (ITQ-6), containing aluminum or titanium in the zeolite framework, were synthetized and modified with copper by an ion-exchange method. The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD, UV-Vis DRS), textural parameters (N2-sorption), surface acidity (NH3-TPD), form and reducibility of deposited copper species (UV-Vis DRS and H2-TPR). Ferrierites and delaminated ITQ-6 zeolites modified with copper were studied as catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). It was shown that aggregated copper oxide species, which were preferentially formed on Ti-zeolites, were catalytically active in direct low-temperature ammonia oxidation to NO, while copper introduced into Al-zeolites was present mainly in the form of monomeric copper cations catalytically active in selective reduction of NO by ammonia to dinitrogen. It was postulated that ammonia oxidation in the presence of the studied catalysts proceeds according to the internal-selective catalytic reduction mechanism (i-SCR) and therefore the suitable ratio between aggregated copper oxide species and monomeric copper cations is necessary to obtain active and selective catalysts for the NH3-SCO process. Cu/Al-ITQ-6 presented the best catalytic properties possibly due to the most optimal ratio of these copper species.

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“…As a support of catalysts, porous mullite ceramics have some unique features, such as good thermal-shock resistance, low gas drag and unnecessary Al 2 O 3 layers to improve specific surface areas compared with cordierite honeycomb ceramics. It has been reported that mullite powder was chosen as catalyst supports [11,12]. But it has not been reported that perovskite-type catalysts are supported on porous mullite fiber ceramics.…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic performance of La0.8Sr0.2CoO3 supported on the mullite fiber ceramic

Zeng

Yan-chun

Liu

et al. 2007

Front. Chem. Eng. China

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The perovskite-type La 0.8 Sr 0.2 CoO 3 supported on the mullite fiber porous ceramics was prepared by means of the impregnating method, and was then characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD); thus we can come to the conclusion that the perovskitetype composite oxidant can disperse on the surface of mullite fiber ceramics. The catalytic activity of the La 0.8 Sr 0.2 CoO 3 for NO and CO was evaluated. The effect of the doped 0.1 wt-% PdCl 2 on the catalytic activity of the perovskite-type La 0.8 Sr 0.2 CoO 3 was also discussed. The results show that the conversion rates of NO and CO respectively reaches 74.5% and 99% at 601°C without doped Pd, and both reach 100% at 350°C with a little doped Pd.

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Cu exchanged microporous titanium silicalite (TS-1) coated on polycrystalline mullite fibres as catalyst for the CO and NO conversion

Cited by 22 publications

References 59 publications

Similarities and differences on the molecular mechanism of CO oxidation on Rh(111) and bimetallic RhCu(111) surfaces

Similarities and differences on the molecular mechanism of CO oxidation on Rh(111) and bimetallic RhCu(111) surfaces

Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

Preparation and catalytic performance of La0.8Sr0.2CoO3 supported on the mullite fiber ceramic

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