Multimetallic catalysts
A multimetallic catalyst having a substrate, intermediate layer and catalyst layer. The catalyst exhibits selectivity greater than 90% and a conversion rate of greater than 30%.
1. A catalyst comprising:
a substrate;
an intermediate layer having a partial monoatomic thickness or a monoatomic thickness and comprising MO x wherein MO x is selected from the transition metal oxides consisting of TiO 2 , ZrO 2 , CoO x (x=1-1.5), ZnO, and MnOx (x=1 to 4), the intermediate layer deposited on the substrate; and
a catalyst layer comprising a platinum group metal, the catalyst layer deposited on the metal oxide intermediate layer;
wherein the catalyst exhibits at least 95% selectivity for propene and further wherein the catalyst exhibits at least a 70% propane conversion.
2. The catalyst of claim 1 , wherein the substrate comprises silica.
3. The catalyst of claim 1 , wherein the catalyst layer consists essentially of a platinum material.
4. The catalyst of claim 1 further comprising an overcoat layer deposited on the catalyst.
5. The catalyst of claim 1 , wherein the overcoat layer comprises multiple layers of alumina.
6. A catalyst for alkane dehydrogenation comprising:
a substrate consisting essentially of silica;
an intermediate layer consisting essentially of ZnO, the intermediate layer deposited on the substrate; and
a catalyst layer consisting essentially of a platinum group metal, the catalyst layer deposited on the intermediate layer;
wherein the catalyst exhibits at least 95% selectivity for propene and further wherein the catalyst exhibits at least a 70% propane conversion.
7. The catalyst of claim 6 , wherein the catalyst exhibits a turnover frequency of at least 100,000 per hour after 50 hours.
8. The catalyst of claim 6 , wherein the intermediate layer has a mono atomic layer thickness.
9. The catalyst of claim 6 , wherein the intermediate layer has a partial mono atomic layer thickness.