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A wash-coat (16) for use as a support for an active catalyst species (18) and a catalytic combustor component (10) incorporating such wash-coat. The wash-coat is a solid solution of alumina or alumina-based material (Al2O3-0-3 wt % La2O3) and a further oxide exhibiting a coefficient of thermal expan

A wash-coat (16) for use as a support for an active catalyst species (18) and a catalytic combustor component (10) incorporating such wash-coat. The wash-coat is a solid solution of alumina or alumina-based material (Al2O3-0-3 wt % La2O3) and a further oxide exhibiting a coefficient of thermal expansion that is lower than that exhibited by alumina. The further oxide may be silicon dioxide (2-30 wt % SiO2), zirconia silicate (2-30 wt % ZrSiO4), neodymium oxide (0-4 wt %), titania (Al2O3-3-40% TiO2) or alumina-based magnesium aluminate spinel (Al2O3-25 wt % MgO) in various embodiments. The active catalyst species may be palladium and a second metal in a concentration of 10-50% of the concentration of the palladium.

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1. A wash-coat for use as a support for an active catalyst species, the wash-coat comprising one of alumina and an alumina-based material, plus La2O3, the La2O3 comprising no more than 0.3 wt %, and a further oxide other than La2O3, BaO, CeO2 and NiO, the further oxide exhibiting a coefficient of th

1. A wash-coat for use as a support for an active catalyst species, the wash-coat comprising one of alumina and an alumina-based material, plus La2O3, the La2O3 comprising no more than 0.3 wt %, and a further oxide other than La2O3, BaO, CeO2 and NiO, the further oxide exhibiting a coefficient of thermal expansion that is lower than that exhibited by alumina, wherein the further oxide comprises zirconia silicate. 2. The wash-coat of claim 1 comprising 2-30 wt % ZrSiO4. 3. A wash-coat for use as support for an active catalyst species, the wash-coat comprising one of alumina and an alumina-based material, plus La2O3, the La2O3 comprising no more than 0.3 wt %, and a further oxide other than La2O3, BaO, CeO2 and NiO, the further oxide exhibiting a coefficient of thermal expansion that is lower than that exhibited by alumina, wherein the further oxide comprises neodymium oxide. 4. The wash-coat of claim 3 comprising no more than 4 wt % Nd2O3. 5. A wash-coat for use as a support for an active catalyst species, the wash-coat comprising one of alumina and an alumina-based material, plus La2O3, the La2O3 comprising no more than 0.3 wt %, and a further oxide other than La2O3, BaO, CeO2 and NiO, the further oxide exhibiting a coefficient of thermal expansion that is lower than that exhibited by alumina, wherein the further oxide comprises titanium oxide. 6. The wash-coat of claim 5 comprising Al2O3-3-40 wt % TiO2. 7. A wash-coat for use as a support for an active catalyst species, the wash-coat comprising one of alumina and an alumina-based material, plus La2O3, the La2O3 comprising no more than 0.3 wt %, and a further oxide other than La2O3, BaO, CeO2 and NiO, the further oxide exhibiting a coefficient of thermal expansion that is lower than that exhibited by alumina, further comprising alumina-based magnesium aluminate spinel in a stoichiometric concentration of Al2O3-25 wt % MgO. 8. A component for a catalytic combustor comprising: a metallic substrate;a ceramic catalyst support disposed on the metallic substrate; andan active catalytic species disbursed within the ceramic catalyst support;wherein the ceramic catalyst support comprises one of alumina and an alumina-based material plus 0-3 wt % La2O3, and a further oxide other than La2O3, BaO, CeO2 and NiO, the further oxide exhibiting a coefficient of thermal expansion that is lower than that exhibited by alumina;wherein a concentration of the active catalytic species varies across a depth of the ceramic catalyst support;wherein the further oxide comprises zirconia silicate. 9. The component of claim 8, wherein the active catalyst species further comprises palladium at a first concentration and a second metal at a second concentration of 10-50% of the first concentration. 10. The component of claim 8, wherein the active catalyst species further comprises palladium and at least one of the group of platinum, rhodium, ruthenium, gold, nickel and rhenium. 11. The component of claim 8, wherein the ceramic catalyst support comprises alumina-based magnesium aluminate spinel in a stoichiometric concentration of Al2O3-25 wt % MgO. 12. The component of claim 11, wherein the active catalyst species further comprises palladium at a first concentration and a second metal at a second concentration of 10-50% of the first concentration.