Effect of La on the thermal stability of Pd/γ-Al2O3 catalytic membranes

Chen, Tiandan; Chen, Hangrong; Chen, Hongguang; Wang, Lin; Shi, Jianlin

doi:10.1016/s0272-8842(01)00045-1

Cited by 9 publications

(14 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nitrates come from the nitric acid and La-nitrate used as the source of La 2 O 3 . There were not any clear endothermic peaks between 600 and 1000 C in any of the samples as also claimed by Chen et al [10]. There were some small shifts in the base line but it was very difficult to identify them as endothermic peaks.…”

Section: Dta-tg Analysissupporting

confidence: 57%

“…Chen et al [10] reported that, up to now, there are no reports related to the improvements of the thermal stability of g-Al 2 O 3 catalytic membranes. Unlike the statement of Chen et al [10], there are reports related to the improvements of the thermal stability of g-Al 2 O 3 with the additions of various oxides to the sol-gel derived alumina gels and top layers. Starting from early 1990s, alumina based ceramic membranes have been studied extensively by our group and results were published in several publications [5,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of La2O3 addition on the thermal stability of γ-Al2O3 gels

Ersoy

Günay

2004

Ceramics International

View full text Add to dashboard Cite

The effects of La 2 O 3 additions up to 5 wt.% on the thermal stabilities of sol-gel derived alumina gels were studied. Observations were made on pore size, total pore area, phase changes at various sintering temperatures and times. XRD, Hg-porosimeter, DTA-TG techniques were employed. The addition of La 2 O 3 to the sol-gel derived alumina gels raised the g-Al 2 O 3 to a-Al 2 O 3 transformation temperature to 1200 C. This significantly improves the thermal stabilities of alumina gels, that are employed in ceramic membranes.

show abstract

Section: Dta-tg Analysissupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Effects of La2O3 addition on the thermal stability of γ-Al2O3 gels

Ersoy

Günay

2004

Ceramics International

View full text Add to dashboard Cite

show abstract

“…Some researchers have also reported the coexistence of θand γ-Al 2 O 3 phases when samples were calcined at 1000 °C. 15,29,30 For example, Ersoy and Gunay 30 observed that 2 wt % La-doped Al Our results are in line with these previous studies, i.e. highpurity γ-Al 2 O 3 was produced, and no transformation to α-Al 2 O 3 was observed after calcination at 1000 °C.…”

Section: Resultssupporting

confidence: 92%

“…The formation of this compound is a result of the solid phase reaction between Al 2 O 3 and La 3+ ions. 29 Figures 5 and 6 illustrate the XRD patterns of the calcined powders with various lanthanum contents. The patterns are similar to those for the as-synthesized powders.…”

Section: Resultsmentioning

confidence: 99%

Phase Stability and Mechanisms of Transformation of La-Doped γ-Alumina

et al. 2018

View full text Add to dashboard Cite

We report the phase stability of cubic γ-AlO with respect to lanthanum dopant amount and describe a complete phase transition sequence up to a temperature of 1800 °C, which proceeds from La-doped γ-AlO to LaAlO/γ-AlO to LaAlO. For this purpose, lanthanum contents from 0.81 to 10.0 atom % were incorporated into AlO powders. X-ray diffraction analyses show that only γ-AlO phase was present after heat treatment at 1000 °C for 2 h with 0.81, 1.68, 2.24, and 2.62 atom % lanthanum concentrations. The phase stabilization can be mainly attributed to the combined effects of small crystallite size of the AlO powders and the presence of the lanthanum dopant, which occupies the AlO octahedral sites. At compositions of 3.63, 5.00, 7.49, and 10.0 atom %, the amount of LaAlO phase formed by the solid phase reaction between AlO and La ions becomes detectable under X-ray diffraction.

show abstract

“…The observed enhancement was ascribed to two factors: (i) stabilization of the supported Au nanoparticles and (ii) increased oxygen activation. As a promoter, La has been shown to improve the thermal stability of alumina. , La has also been shown to have additional benefits as a promoter; when doped onto a Pd catalyst, strong interactions between Pd and La can influence the oxidation state of Pd . Li et al determined that Pd supported on a La-modified alumina material enhanced its catalytic performance in this reaction relative to the original Pd/Al 2 O 3 catalyst.…”

Section: Oxidation Of Different Sorts Of Vocsmentioning

confidence: 99%