The role of rare earth oxides as promoters and stabilizers in combustion catalysts

Colussi, Sara; Leitenburg, Carla de; Dolcetti, Giuliano; Trovarelli, Alessandro

doi:10.1016/j.jallcom.2003.11.028

Cited by 82 publications

(66 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several of the rare earth elements and their corresponding oxides are of exceedingly technical importance and are used in critical parts in, e.g., electronic, magnetic, nuclear, optical, and catalytic devices [3,4]. Gadolinium oxide, one of the rare earth oxides, is used as an additive in other ceramics, e.g., Gd 2 O 3 was used to stabilize the tetragonal phase of zirconia [5] and to improve the densification of sintered SiC [6].…”

Section: Introductionmentioning

confidence: 99%

Growth of Gd2O3 nanoparticles inside mesoporous silica frameworks

Ballem

Söderlind

Nordblad

et al. 2013

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

Gadolinium oxide (Gd 2 O 3 ) nanoparticles with very small size and narrow size distribution were synthesized by infiltration of Gd(NO 3 ) 3 ·6H 2 O as an oxide precursor into the pores of SBA-15 mesoporous silica using a wet-impregnation technique. High resolution transmission electron microscopy and X-ray diffraction show that during the hydrothermal treatment of the precursor at 550 °C, gadolinium oxide nanoparticles inside the silica pores are formed. Subsequent dissolution of the silica framework in aqueous NaOH resulted in well dispersed nanoparticles with an average diameter of 3.6 ± 0.9 nm. If GdCl 3 ·6H 2 O is used as precursor, GdOCl is formed instead of Gd 2 O 3 . The Gd 2 O 3 nanoparticles showed a weak antiferromagnetic behaviour, as expected.

show abstract

Section: Introductionmentioning

confidence: 99%

Growth of Gd2O3 nanoparticles inside mesoporous silica frameworks

Ballem

Söderlind

Nordblad

et al. 2013

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

show abstract

“…They are widely used as catalysts for reducing CO, hydrocarbons, and NO x emissions from gasoline engines; [1][2][3][4] for soot oxidation; 5 and as electrolyte materials of solid oxide fuel cells 6 but also as sorbents for desulfurization processes. 7 In the field of environmental catalysis, lanthanum oxide is well-known as surface stabilizer of supports based on alumina and zirconia, 8,9 while the catalytic activities of pure and doped cerium have been associated with, for instance, interstitial oxides, 10,11 lattice oxygen atoms, 12,13 structural defects, 14,15 basicity of surfaces, 16 and redox activity. 3,9,17,18 In most of these studies, catalytic activities have been reported as a function of the bulk composition of cerium-lanthanum mixed oxides, and only a few studies have focused on correlating catalytic activities to both bulk and surface composition.…”

Section: Introductionmentioning

confidence: 99%

Phase Segregation in Cerium−Lanthanum Solid Solutions

et al. 2006

View full text Add to dashboard Cite

Electron energy-loss spectroscopy (EELS) in combination with scanning transmission electron microscopy (STEM) reveals that the La enrichment at the surface of cerium-lanthanum solid solutions is an averaged effect and that segregation occurs in a mixed oxide phase. This separation occurs within a crystalline particle, where the dopant-rich phase is located at the surface of the dopant-deficient phase. The limiting structure appears to be a solid solution with a La fraction of x ) 0.6 in the bulk and x ) 0.75 at the surface. Up to a La fraction of 0.6, this phase will coexist with a lanthanum-type structure in different proportions depending on the dopant amount. STEM-EELS appears to be a powerful technique to clarify the existence of a multiphase system, and it shows that XRF, XPS, and XRD measure averaged results and do not show the phase complexity of the solids.

show abstract

“…Catalyst promoters are also used to enhance the activity and selectivity (e.g . , SnO 2 , CeO 2 ) (Sekizawa, 2000;Thevenin, 2003), as well as thermal/chemical stability (e.g., NiO, Rare earth oxides) (Widjaja, 1999;Colussi, 2004). Often times mixtures of metal oxide catalyst supports are used to produce synergistic effects that enhance both activity and stability of the catalyst (Widjaja, (Marchetti & Forni, 1998;Arai, 1986;McCarty & Wise, 1990;Ferri & Forni, 2001;Ciambelli, 2001;Alifanti, 2004 (Arai, 1986).…”

Section: Catalyst and Support Developmentmentioning

confidence: 99%

Catalyzed Ceramic Burner Material

Barnes¹

2012

View full text Add to dashboard Cite

The role of rare earth oxides as promoters and stabilizers in combustion catalysts

Cited by 82 publications

References 28 publications

Growth of Gd2O3 nanoparticles inside mesoporous silica frameworks

Growth of Gd2O3 nanoparticles inside mesoporous silica frameworks

Phase Segregation in Cerium−Lanthanum Solid Solutions

Catalyzed Ceramic Burner Material

Contact Info

Product

Resources

About