Thermal stabilization of high surface area alumina

Schaper, H.; Doesburg, E.B.M.; Korte, P.H.M. de; Reijen, L. L. van

doi:10.1016/0167-2738(85)90050-5

Cited by 78 publications

(35 citation statements)

References 3 publications

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“…S2 in ESM). Similar effects of water vapour on the phase transformation of transition alumina are reported in the literature [26][27][28]. By contrast, water vapour had no detectable influence on the structure and the crystallinity of 10A2B (see Fig.…”

Section: Catalyst Performance Testingsupporting

confidence: 65%

TWC Performance of Honeycomb Catalysts Coated with Pd-Supported 10Al2O3 · 2B2O3 and Its Cation-Substituted Compounds

Nagao

Nakahara

Sato

et al. 2016

Emiss. Control Sci. Technol.

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TWC performances of honeycomb-coated Pd catalysts supported on 10Al 2 O 3 · 2B 2 O 3 (Al 20 B 4 O 36 , 10A2B) and its Fe-substituted analogue (FeAl 19 B 4 O 36 , Fe-10A2B) were studied using simulated exhaust gas mixtures. A monolayercoated honeycomb containing Pd/10A2B was able to achieve higher conversion of CO, C 3 H 6 and NO in stoichiometric gas mixtures after the light-off temperature compared to a honeycomb containing Pd/γ-Al 2 O 3 . Bilayer-coated honeycombs comprising a top Rh layer (Rh/CeO 2 -ZrO 2 ) and a bottom Pd layer (Pd/10A2B or Pd/γ-Al 2 O 3 ) with varying Rh:Pd ratios were evaluated under stoichiometric conditions. The Rh loading in the top layer could be decreased while preserving higher levels of conversion at 400°C when Pd/10A2B was used as opposed to Pd/γ-Al 2 O 3 . Another monolayer-coated honeycomb comprising Pd/Fe-10A2B demonstrated higher NO conversion under fuel-rich conditions compared to conventional Pd catalysts that were loaded on 10A2B, γ-Al 2 O 3 and Pd/CeO 2 -ZrO 2 . Pd/Fe-10A2B promoted the conversion of NO to NH 3 because CO-H 2 O and subsequent NO-H 2 reactions were accelerated.

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Section: Catalyst Performance Testingsupporting

confidence: 65%

TWC Performance of Honeycomb Catalysts Coated with Pd-Supported 10Al2O3 · 2B2O3 and Its Cation-Substituted Compounds

Nagao

Nakahara

Sato

et al. 2016

Emiss. Control Sci. Technol.

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“…The previous results of transition aluminas have showed that the impurities or the additives greatly influence the sintering and phase transformations of aluminas. Lanthanum has extremely positive effect of inhibition on the sintering and ␣-phase transformation [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. However, the chemical state of this additive in aluminas and the formation of microstructure of La-aluminas are still of open question, so that the mechanism of stabilization has not been fully established regarding with the nanometer-level microstructural assessment of lanthanum-modified aluminas.…”

Section: Introductionmentioning

confidence: 99%

Formation of featured nano-structure in thermal stable La-doped alumina composite catalyst

Nishio

Ozawa

2009

Journal of Alloys and Compounds

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“…However, the addition of a few mol% La 2 O 3 to g-alumina has been found to result in improved surface area stability at high temperatures [11][12][13] . Using X-ray photoelectron spectroscopy (XPS), Haack et al 14 determined that for La/Al ratios o0.…”

mentioning

confidence: 99%

Low-temperature carbon monoxide oxidation catalysed by regenerable atomically dispersed palladium on alumina

et al. 2014

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Catalysis by single isolated atoms of precious metals has attracted much recent interest, as it promises the ultimate in atom efficiency. Most previous reports are on reducible oxide supports. Here we show that isolated palladium atoms can be catalytically active on industrially relevant g-alumina supports. The addition of lanthanum oxide to the alumina, long known for its ability to improve alumina stability, is found to also help in the stabilization of isolated palladium atoms. Aberration-corrected scanning transmission electron microscopy and operando X-ray absorption spectroscopy confirm the presence of intermingled palladium and lanthanum on the g-alumina surface. Carbon monoxide oxidation reactivity measurements show onset of catalytic activity at 40°C. The catalyst activity can be regenerated by oxidation at 700°C in air. The high-temperature stability and regenerability of these ionic palladium species make this catalyst system of potential interest for low-temperature exhaust treatment catalysts.

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Thermal stabilization of high surface area alumina

Cited by 78 publications

References 3 publications

TWC Performance of Honeycomb Catalysts Coated with Pd-Supported 10Al2O3 · 2B2O3 and Its Cation-Substituted Compounds

TWC Performance of Honeycomb Catalysts Coated with Pd-Supported 10Al2O3 · 2B2O3 and Its Cation-Substituted Compounds

Formation of featured nano-structure in thermal stable La-doped alumina composite catalyst

Low-temperature carbon monoxide oxidation catalysed by regenerable atomically dispersed palladium on alumina

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