Production of ultrapure hydrogen in a Pd–Ag membrane reactor using Ru/La2O3 catalysts

Faroldi, Betina María Cecilia; Carrara, Carlos R.; Lombardo, E.A.; Cornaglia, Laura María

doi:10.1016/j.apcata.2006.11.015

Cited by 46 publications

(39 citation statements)

References 41 publications

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“…For the used catalysts, only II-La 2 O 2 CO 3 was observed. No XRD reflections associated with Ru compounds were detected in any case [6].…”

Section: Reactivity Of Ru and La Speciesmentioning

confidence: 91%

“…Our Ru-La based catalysts exhibit a forward reaction rate comparable to that previously reported by other authors [5] using different supports. The optimum Ru load on La 2 O 3 was 0.6 wt% [6]. The role of La 2 O 3 in the Rh and Ru lanthanum systems has been previously reported.…”

Section: Introductionmentioning

confidence: 93%

“…We have recently [6] employed LRS to characterize the Ru-lanthanum system. The Raman spectra of the Ru/La 2 O 3 catalysts calcined at 823 K exhibited peaks at 358, 384, 747, and 1086 cm -1 , previously assigned [11] to the hexagonal form of the lanthanum oxycarbonate (II-La 2 O 2 CO 3 ).…”

Section: Reactivity Of Ru and La Speciesmentioning

confidence: 99%

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Kinetic and Stability Studies of Ru/La2O3 Used in the Dry Reforming of Methane

et al. 2008

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The catalytic activity toward hydrogen production through the dry reforming of methane was determined for Ru supported on lanthanum oxide. The catalyst remained stable for more than 80 h in the 823-903 K temperature range and reactant partial pressure ratio (P CO 2 =P CH 4 ) equal to unity. However, a significant deactivation was observed during the kinetic measurements when the catalyst was exposed to P CO 2 =P CH 4 [ 1 at 823 K. In order to establish why the catalyst deactivated, the Ru reactivity in reductive and CO 2 rich atmospheres was studied by in situ LRS and XPS spectroscopies. The partial re-oxidation of metallic Ru could be one of the factors that produce the catalyst deactivation. To perform the kinetic measurements, the temperature range and the partial pressure ratios were selected within the window where the Ru catalyst was stable. The kinetic data and supporting spectroscopic evidence is consistent with a mechanism in which the metal and the oxide play key roles in decomposing the paraffin and activating the CO 2 , respectively.

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“…For the used catalysts, only II-La 2 O 2 CO 3 was observed. No XRD reflections associated with Ru compounds were detected in any case [6].…”

Section: Reactivity Of Ru and La Speciesmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 93%

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Kinetic and Stability Studies of Ru/La2O3 Used in the Dry Reforming of Methane

et al. 2008

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“…It has been reported that low-temperature TPR peak (\140°C) of Ru species was assigned to the reduction of well-dispersed RuO x species, and the peak at somewhat higher temperature (about 200°C) was assigned to the reduction of well- [27] Handbook of X-ray Photoelectron Spectroscopy Fig. 2 HR-TEM images (a, b) and EDX spectra (c) of Ru-Re/ZrO 2 crystallized RuO 2 particles [30][31][32][33][34]. The weak and broad reduction peak at 456°C in the H 2 -TPR of Ru/ZrO 2 might be attributed to the interaction of Ru metal and ZrO 2 support [35].…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Hydrogenolysis of Glycerol to Propanediols Over Highly Active Ru–Re Bimetallic Catalysts

2009

Top Catal

114

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Several supported Ru-Re bimetallic catalysts (Ru-Re/SiO 2 , Ru-Re/ZrO 2 , Ru-Re/TiO 2 , Ru-Re/H-b, Ru-Re/H-ZSM5) and Ru monometallic catalysts (Ru/SiO 2 , Ru/ZrO 2 , Ru/TiO 2 , Ru/H-b, Ru/H-ZSM5) were prepared and their catalytic performances were evaluated in the hydrogenolysis of glycerol to propanediols (1,2-propanediol and 1,3-propanediol) with a batch type reactor (autoclave) under the reaction conditions of 160°C, 8.0 MPa and 8 h. Compared with Ru monometallic catalysts, the Ru-Re bimetallic catalysts showed much higher activity in the hydrogenolysis of glycerol, and Re exhibited obvious promoting effect on the performance of the catalysts. The supported Ru monometallic catalysts and Ru-Re bimetallic catalysts were characterized by N 2 adsorption/desorption, XRD, TEM-EDX, H 2 -TPR and CO chemisorption for obtaining some physicochemical properties of the catalysts, such as specific surface areas, crystal phases, morphologies/microstructure, reduction behaviors and dispersion of Ru metal. The results of XRD and CO chemisorption indicate that the addition of Re component could improve the dispersion of Ru species on supports. The measurements of H 2 -TPR revealed that the coexistence of Re and Ru components on supports changed the respective reduction behavior of Re or Ru alone on the supports, indicating the existence of synergistic effect between Ru and Re species on the bimetallic catalysts. The hydrogenolysis of some products (such as 1,2-propanediol, 1,3-propanediol, 1-propanol and 2-propanol) were also examined over Ru and Ru-Re catalysts for evaluating influence of Re-Re on the reaction routes during glycerol hydrogenolysis. The results showed that over Ru-Re catalysts, glycerol was favorable to be converted to 1,2-propanediol, but not favorable to ethylene glycol, while 1,2-propanediol and 1,3-propanediol were favorable to be converted to 1-propanol. The influence of glycerol concentration in its aqueous solution on the catalytic performance was also evaluated over Ru and Ru-Re catalysts.

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“…This enables the use of syngas directly for the Fischer-Tropsch synthesis without further separation steps. When the goal of the methane reforming reactions is to produce hydrogen for use in a fuel cell, they can be carried out in membrane reactors that combine both the reaction and the hydrogen separation process in a single device [1,2].…”

Section: Introductionmentioning

confidence: 99%

Influence of La incorporation on the catalytic activity of Ru/ETS-10 catalysts for hydrogen production

Faroldi

Irusta

Cornaglia

2015

Applied Catalysis A: General

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The incorporation of lanthanum on ETS-10 titanosilicate and its influence on the catalytic activity of Ru catalysts for the dry reforming of methane reaction were studied.The catalysts were prepared through ion exchange of ETS-10 using different lanthanum solution concentrations (0.1, 0.2 and 0.4 % wt of La 2 O 3 ). The Ru loading was 0.6 wt.% for all catalysts. The methane reaction rates for Ru/LaETS-10 catalysts showed an increase in comparison with Ru/ETS-10. This could be related to the lanthanum participation in the reaction mechanism. Moreover, all the formulations were stable after 70 h on stream.In order to study the effect of lanthanum exchange in the structure of ETS-10 supports, the solids were characterized by BET, XRD, TEM, FTIR XPS, and Laser Raman spectroscopy.The relative crystallinities were lower than 80%, indicating that the La exchange could have an important effect on the crystalline structure of ETS-10, in agreement with Raman and FTIR results.The surface Ru/Ti ratio determined by XPS was higher in the case of Ru/LaETS-10 synthesized with the highest La concentration in the exchange solution. The Na/Ti ratio, measured by XPS and EDX, was lower for the Ru/LaETS-10 catalysts compared with ETS-10 suggesting that La was exchanged in the structure.

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Production of ultrapure hydrogen in a Pd–Ag membrane reactor using Ru/La2O3 catalysts

Cited by 46 publications

References 41 publications

Kinetic and Stability Studies of Ru/La2O3 Used in the Dry Reforming of Methane

Kinetic and Stability Studies of Ru/La2O3 Used in the Dry Reforming of Methane

Hydrogenolysis of Glycerol to Propanediols Over Highly Active Ru–Re Bimetallic Catalysts

Influence of La incorporation on the catalytic activity of Ru/ETS-10 catalysts for hydrogen production

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