Anticoking catalyst coatings with alumina barrier layer
View Patent ↗An article including a metal substrate, an anti-coking catalyst layer and an alumina barrier layer disposed between the metal substrate and the anti-coking catalyst layer is provided. A process for making the article is also provided.
1. An article, comprising:
a metal substrate;
an anti-coking catalyst layer; and
an alumina barrier layer disposed between the metal substrate and the anti-coking catalyst layer,
wherein said alumina barrier layer comprises α-alumina.
2. The article of claim 1 , wherein the metal substrate is a tube having an inner surface, and the alumina barrier layer is disposed over the inner surface of the tube and the anti-coking catalyst layer is disposed on the alumina layer.
3. The article of claim 1 , wherein the metal substrate comprises at least one of chromium, nickel and iron.
4. The article of claim 1 , wherein the metal substrate contains less than 3 wt % aluminum.
5. The article of claim 1 , wherein the metal substrate contains less than 0.05 wt % aluminum.
6. The article of claim 1 , wherein the anti-coking catalyst comprises perovskite.
7. The article of claim 6 , wherein the perovskite is selected from the group consisting of doped LaCrO 3 , doped LaMnO 3 , BaCeO 3 , BaZrO 3 , BaCe x Zr (1-x) O 3 , BaCe x Y (1-x) O 3 and combinations thereof, wherein 0≦x≦1.
8. The article of claim 7 , wherein the perovskite is BaCe x Zr (1-x) O 3 , wherein 0≦x≦1.
9. The article of claim 7 , wherein the perovskite is BaCe 0.7 Zr 0.3 O 3 .
10. An article, comprising:
a metal substrate;
an anti-coking catalyst layer, wherein said anti-coking catalyst comprises perovskite, said perovskite selected from the group consisting of doped LaCrO 3 , doped LaMnO 3 , BaCeO 3 , BaZrO 3 , BaCe x Zr (1-x) O 3 , BaCe x Y (1-x) O 3 and combinations thereof, wherein 0≦x≦1; and
an alumina barrier layer disposed between the metal substrate and the anti-coking catalyst layer,
wherein said perovskite is BaCe x Zr (1-x) O 3 , wherein 0≦x≦1.
11. The article as in claim 10 , wherein the perovskite is BaCe 0.7 Zr 0.3 O 3 .
12. An article, comprising:
a metal substrate;
an anti-coking catalyst layer; and
an alumina barrier layer disposed between the metal substrate and the anti-coking catalyst layer,
wherein the metal substrate contains less than 3 wt % aluminum.