Stabilization of catalyst particles against sintering on oxide supports with high oxygen ion lability exemplified by Ir-catalyzed decomposition of N2O

Yentekakis, I.V.; Goula, Grammatiki; Panagiotopoulou, Paraskevi; Kampouri, Stavroula; Taylor, Martin J.; Kyriakou, Georgios; Lambert, Richard M.

doi:10.1016/j.apcatb.2016.04.011

Cited by 70 publications

(52 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specifically, a gas mixture of 5 vol.% CO 2 /Ar and 1 vol.% NH 3 /He (30 NmL/min), was passed over ∼0.15 g of the catalysts (20 vol.% O 2 /He, 500 • C, 2 h) using a temperature ramp of 30 • C/min and the TCD signal was continuously recorded. Temperature programmed reduction (H 2 -TPR) was performed by loading 100 mg of the calcined catalysts or supports in a U-type quartz tube adapted to a continuous flow TPR/TPD apparatus coupled with mass spectrometry, following the procedures described in detail elsewhere (Yentekakis et al, 2016).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…In this respect, nickel based catalysts attract particular attention as they are known to exhibit excellent catalytic performance; the drawback is that they suffer from the aforementioned problems Charisiou et al, 2016b;Elsayed et al, 2017). In theory, coke deposition can be avoided by: (i) altering the electronic properties of metal-support interactions, (ii) influencing the size of metallic particles and, (iii) improving the oxygen storage capacity and mobility within supporting material (Roh et al, 2006;Kumar et al, 2007;Chen et al, 2008;Goula et al, 2014;Yentekakis et al, 2015Yentekakis et al, , 2016Han et al, 2017). Thus, the attempts that have been undertaken to improve the stability of DRM nickel catalysts have focused on the use of different oxides as supports (e.g., Al 2 O 3 , SiO 2 , La 2 O 3 , CeO 2 , ZrO 2 ) (Pompeo et al, 2007;Bereketidou and Goula, 2012;Li et al, 2016) or the use of a variety of dopants that include transition metals (e.g., Fe, Co, Sn) (Ay and Uner, 2015;Theofanidis et al, 2015;Zhao et al, 2016), noble metals (e.g., Ag, Pt, Pd, Ir) Yentekakis et al, 2015;Yu et al, 2015), lanthanide metals (e.g., La, Ce, Pr) (Goula et al, 2016a;Vasiliades et al, 2016;Xiang et al, 2016) and alkaline earth metals (e.g., Sr, Ca, Ba) (Bellido et al, 2009;Sutthiumporn and Kawi, 2011).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of WO3 Modification of ZrO2 Support on the Ni-Catalyzed Dry Reforming of Biogas Reaction for Syngas Production

Charisiou

Siakavelas

Papageridis

et al. 2017

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

The time-on-stream catalytic performance and stability of 8 wt. % Ni catalyst supported on two commercially available catalytic supports, ZrO 2 and 15 wt.% WO 3 -ZrO 2 , was investigated under the biogas dry reforming reaction for syngas production, at 750 • C and a biogas quality equal to CH 4 /CO 2 = 1.5, that represents a common concentration of real biogas. A number of analytical techniques such as N 2 adsorption/desorption (BET method), XRD, H 2 -TPR, NH 3 -and CO 2 -TPD, SEM, ICP, thermal analysis (TGA/DTG) and Raman spectroscopy were used in order to determine textural, structural and other physicochemical properties of the catalytic materials, and the type of carbon deposited on the catalytic surface of spent samples. These techniques were used in an attempt to understand better the effects of WO 3 -induced modifications on the catalyst morphology, physicochemical properties and catalytic performance. Although Ni dispersion and reducibility characteristics were found superior on the modified Ni/WZr sample than that on Ni/Zr, its dry reforming of methane (DRM) performance was inferior; a result attributed to the enhanced acidity and complete loss of the basicity recorded on this catalyst, an effect that competes and finally overshadows the benefits of the other superior properties. Raman studies revealed that the degree of graphitization decreases with the insertion of WO 3 in the crystalline structure of the ZrO 2 support, as the I D /I G peak intensity ratio is 1.03 for the Ni/Zr and 1.29 for the Ni/WZr catalyst.

show abstract

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of WO3 Modification of ZrO2 Support on the Ni-Catalyzed Dry Reforming of Biogas Reaction for Syngas Production

Charisiou

Siakavelas

Papageridis

et al. 2017

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…We have recently shown that the thermal sintering characteristics of Ir are strongly correlated with the lability of lattice oxygen in the oxide supports [11] and that metal-support interactions between Ir and oxide supports having high oxygen ion lability can strongly stabilize Ir nanoparticles at high temperatures under oxidizing conditions. It is well known that such supports can also strongly modify the electronic state of the active phase interfaced with them, and, depending on the electrophilic orphobic character of the reactants, promote or inhibit the catalytic chemistry [12,13].…”

Section: Introductionmentioning

confidence: 99%

Ir-Catalysed Nitrous oxide (N2O) Decomposition: Effect of Ir Particle Size and Metal–Support Interactions

et al. 2017

View full text Add to dashboard Cite

The effect of the morphology of Ir particles supported on γ-Al2O3, 8mol%Y2O3-stabilized ZrO2 (YSZ), 10mol%Gd2O3-doped CeO2 (GDC) and 80wt%Al2O3-10wt%CeO2-10wt%ZrO2 (ACZ) on their stability on oxidative conditions, the associated metal-support interactions and activity for catalytic decomposition of N2O has been studied. Supports with intermediate or high oxygen ion lability (GDC and ACZ) effectively stabilized Ir nanoparticles against sintering, in striking contrast to supports offering negligible or low oxygen ion lability (γ-Al2O3 and YSZ). Turnover frequency studies using size-controlled Ir particles showed strong structure sensitivity, de-N2O catalysis being favoured on large catalyst particles. Although metallic Ir showed some de-N2O activity, IrO2 was more active, possibly present as a superficial overlayer on the iridium particles under reaction conditions. Support-induced turnover rate modifications, resulted from an effective double layer [O δ-δ + ](Ir) on the surface of iridium nanoparticles, via O 2backspillover from the support, were significant in the case of GDC and ACZ.

show abstract

“…Various catalytic systems such as transition and noble catalysts, perovskites, spinels and zeolites have been widely reported [16][17][18][19][20][21]. Yentekakis et al [22] used iridium as a catalytic component and it was supported on a variety of surfaces, e.g., γ-Al 2 O 3 and composites of gadolinia-ceria, alumina-ceria-zirconia, indicating that the composites exhibited high resistance of the iridium nanoparticles to sintering in an oxidative environment, and that the catalytic behavior was consistent with the independently measured sintering characteristics, while Lin et al [23] reported that the Ir/Al 2 O 3 sample exhibited excellent performance in initiating the decomposition of N 2 O at a low temperature of 200ºC. Abu-Zied et al [24] recently indicated that the samples of rare earth (Nd, Pr, Tb and Y) doped NiO prepared by the calcination of their corresponding oxalate mixtures, which were synthesized via the microwave-assisted precipitation method, had led to an obvious decrease of the NiO crystallites size, and it was the origin of a substantial activity increase upon doping NiO with the various rare earth oxides.…”

Section: Introductionmentioning

confidence: 99%

N2O Abatement over Ruthenium Supported on Highly Dispersed Hydrotalcite-Like Composite Metal Oxides

Zhang¹,

Guo²,

Li³

et al. 2019

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

Highly dispersive hydrotalcite-like composite metal oxides were prepared by coprecipitation method. CO 2-TPD characterization showed that the adsorption capacity over the samples at low (<300ºC) and middle (300~550ºC) temperatures was improved by using La or Cu to modify the sample of MgAlO, while slightly reduced at high temperature (>550ºC). The experimental results showed that the composite metal oxide, Me x O y (Me=La, Mg, Al), had relatively good performance on N 2 O decomposition. A series of Ru/Me x O y catalysts were prepared by programed impregnation method. CO 2-TPD analysis indicated that the samples of Ru/Me x O y not only increased the total CO 2 adsorption capacity, but also obviously enhanced CO 2 adsorption capacity at 300~550ºC compared with Me x O y. TEM characterization showed that the Ru component was uniformly loaded on the support surface under nanoscale. N 2 O catalytic decomposition showed that the suitable Ru loading on support was 2.0(wt.)%, i.e., Ru(2.0)/Me x O y. Under conditions of (v/v) 10% N 2 O+82% N 2 +5.0% O 2 +3.0% H 2 O, 30000h-1 of space velocity, 510ºC, the stability test showed that N 2 O conversion remained ca. 95.0%, indicating that Ru(2.0)/Me x O y had good stability and activity at relatively low temperature.

show abstract

Stabilization of catalyst particles against sintering on oxide supports with high oxygen ion lability exemplified by Ir-catalyzed decomposition of N2O

Cited by 70 publications

References 49 publications

The Effect of WO3 Modification of ZrO2 Support on the Ni-Catalyzed Dry Reforming of Biogas Reaction for Syngas Production

The Effect of WO3 Modification of ZrO2 Support on the Ni-Catalyzed Dry Reforming of Biogas Reaction for Syngas Production

Ir-Catalysed Nitrous oxide (N2O) Decomposition: Effect of Ir Particle Size and Metal–Support Interactions

N2O Abatement over Ruthenium Supported on Highly Dispersed Hydrotalcite-Like Composite Metal Oxides

Contact Info

Product

Resources

About