Effect of the active metals on the selective H2 production in glycerol steam reforming

Araque, Marcia; T, L.M. Martínez; Vargas, Julio; Centeno, M.A.; Roger, Anne‐Cécile

doi:10.1016/j.apcatb.2012.06.028

Cited by 57 publications

(33 citation statements)

References 48 publications

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“…The lower formation of condensable products for CZCoRu with respect to CZRu is in agreement with the higher value of X G obtained with the former. Similar results were observed for CZCoRh and CZRh catalysts [28], where the bimetallic CoRh catalyst favored the production of non-condensable for a longer time, promoting the H 2 production.…”

Section: Activity Resultssupporting

confidence: 87%

“…Thanks to a similarity of the distribution byproducts obtained when CZCoRu is used, with the one obtained with CZCoRh catalyst [28], the reaction pathway to describe the glycerol steam reforming reaction should be similar whatever the noble metal used. We have already proposed a reaction pathway for glycerol steam reforming [16,28], in which the non-condensable products, H 2 , CO 2 and CO, were formed either by direct glycerol steam reforming or by steam reforming of the non-condensable products, mostly produced by thermal decomposition.…”

Section: Activity Resultsmentioning

confidence: 99%

“…In the following study, we present the effect of ruthenium insertion on the structural and redox properties of CeZr (0.65/0.35 CeO 2 /ZrO 2 mass ratio) and CeZrCo mixed oxides. The obtained results are compared with those previously reported for similar catalysts modified by rhodium [28,29]. The possible causes of deactivation are discussed according to the characterization of spent catalysts and the analysis of the by-products.…”

Section: Introductionmentioning

confidence: 88%

“…The catalytic test and the analytical method used to evaluate the catalytic performance of the catalysts were both described elsewhere [16,28]. For the reaction, 55 mg of catalysts diluted with 55 mg of SiC (SICAT®) were placed in a straight tubular quartz reactor at atmospheric pressure for 24 h. Before reaction all the catalysts were reduced in situ at 450 • C for 12 h with 3 ml min −1 of H 2 .…”

Section: Glycerol Steam Reforming Conditionsmentioning

confidence: 99%

“…We have recently described that the simultaneous addition of cobalt and rhodium enhanced the properties of CeZr mixed oxide [28]. High incorporation of cobalt improves the redox properties of the support and also decreases the formation of carbon deposits, thus positively affecting the catalytic properties.…”

Section: Introductionmentioning

confidence: 98%

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Role of ruthenium on the catalytic properties of CeZr and CeZrCo mixed oxides for glycerol steam reforming reaction toward H2 production

Araque

Centeno

et al. 2015

Catalysis Today

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Please cite this article in press as: L.M.M. T, et al., Role of ruthenium on the catalytic properties of CeZr and CeZrCo mixed oxides for glycerol steam reforming reaction toward H 2 production, Catal. Today (2014), http://dx. a b s t r a c tThe effect of ruthenium on the physico-chemical properties of CeZr and CeZrCo mixed oxides for H 2 production by glycerol steam reforming reaction has been studied. The combination of in situ Raman spectroscopy under both reductive and oxidative conditions, H 2 /O 2 pulses and XRD, Raman, BET analysis, H 2 -TPR and TPD-TPO analyses contributed to the determination of the structural and textural properties, redox behavior, re-oxidation capacity and resistance to carbon deposition of the synthesized catalysts. The results show that the catalytic activity is improved by the (positive) cooperative and complementary effect between cobalt and ruthenium that favors the selectivity toward the steam reforming, selective to H 2 , with respect to the unselective thermal decomposition of glycerol. Ruthenium stabilizes the cobalt cations inserted in the fluorite structure preventing its rejection as Co 3 O 4 ; and provides the necessary hydrogen to reduce Ce 4+ . The combination cobalt-ruthenium modifies positively the redox properties of the catalysts, increases the re-oxidation capacity (OSC) and promotes the gasification of the carbon deposits. Under the reaction conditions, the decrease in glycerol conversion came along with a change of selectivity. The formation of H 2 and CO 2 were strongly decreased, while the formation of CO, C 2 H 4 and condensable products (mainly hydroxyacetone) increase. The differences in the catalytic stability and activity of the catalysts are related to the capability of the catalysts to activate H 2 O under the reaction conditions, favoring the steam reforming reaction over the thermal decomposition.

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Section: Activity Resultssupporting

confidence: 87%