A composition comprising a ternary intermetallic compound X.sub.2YZ, wherein X, Y, and Z are different from one another; X being selected from the group consisting of Mn, Fe, Co, Ni, Cu, and Pd; Y being selected from the group consisting of Cr, Co, and Ni; and Z being selected from the group consisting of Al, Si, Ga, Ge, In, Sn, Zn, and Sb; wherein the ternary intermetallic compound is supported on a porous oxidic support material. The composition may be prepared by providing a liquid mixture of sources of X, Y, and Z, and the porous oxidic support material, removing the liquid and heating the resulting mixture in a reducing atmosphere. The composition is useful as catalyst.

A composition comprising a ternary intermetallic compound X.sub.2YZ, wherein X, Y, and Z are different from one another; X being selected from the group consisting of Mn, Fe, Co, Ni, Cu, and Pd; Y being selected from the group consisting of Cr, Co, and Ni; and Z being selected from the group consisting of Al, Si, Ga, Ge, In, Sn, Zn, and Sb; wherein the ternary intermetallic compound is supported on a porous oxidic support material. The composition may be prepared by providing a liquid mixture of sources of X, Y, and Z, and the porous oxidic support material, removing the liquid and heating the resulting mixture in a reducing atmosphere. The composition is useful as catalyst.

In general, disclosed herein are methods for forming hydrogen by use of an ammonia decomposition catalyst system. For instance, a method can include contacting a catalyst system with an ammonia source at a temperature of about 450? C. or lower. The catalyst systems can include a support material and a trimetallic catalyst component carried on the support material and within a reactor. Disclosed catalyst systems can decompose ammonia at relatively low temperatures and can provide an efficient and cost-effective route to utilization of ammonia as a carbon-free hydrogen storage and generation material.

In general, disclosed herein are methods for forming hydrogen by use of an ammonia decomposition catalyst system. For instance, a method can include contacting a catalyst system with an ammonia source at a temperature of about 450? C. or lower. The catalyst systems can include a support material and a trimetallic catalyst component carried on the support material and within a reactor. Disclosed catalyst systems can decompose ammonia at relatively low temperatures and can provide an efficient and cost-effective route to utilization of ammonia as a carbon-free hydrogen storage and generation material.

Methods, systems, and compositions related to the recycling and/or recovery of activating materials from activated aluminum are disclosed. In one embodiment, an aqueous solution's composition may be controlled to maintain aluminum ions dissolved in solution during reaction of an activated aluminum. In another embodiment, aluminum hydroxide containing the activating materials may be dissolved into an aqueous solution to isolate the activating materials.

This invention relates to a catalyst system comprising (a) at least one layer of a first catalyst comprising a dehydrogenation active metal on a solid support; (b) at least one layer of a second catalyst comprising a metal oxide; and (c) at least one layer of a third catalyst comprising a transition metal on an inorganic support; wherein the at least one layer of a second catalyst is sandwiched between the at least one layer of a first catalyst and the at least one layer of a third catalyst; and a process comprising contacting a hydrocarbon feed with the catalyst system.

This invention relates to a catalyst system comprising (a) at least one layer of a first catalyst comprising a dehydrogenation active metal on a solid support; (b) at least one layer of a second catalyst comprising a metal oxide; and (c) at least one layer of a third catalyst comprising a transition metal on an inorganic support; wherein the at least one layer of a second catalyst is sandwiched between the at least one layer of a first catalyst and the at least one layer of a third catalyst; and a process comprising contacting a hydrocarbon feed with the catalyst system.

A catalyst comprising chromia and at least one additional metal or compound thereof and wherein the catalyst has a total pore volume of greater than 0.3 cm.sup.3/g and the mean pore diameter is greater than or equal to 90 ?, wherein the total pore volume is measured by N2 adsorption porosimetry and the mean pore diameter is measured by N.sub.2 BET adsorption porosimetry, and wherein the at least one additional metal is selected from Li, Na, K, Ca, Mg, Cs, Sc, Al, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Co, Rh, Ir, Ni, Pd, In, Pt, Cu, Ag, Au, Zn, La, Ce and mixtures thereof.

A catalyst comprising chromia and at least one additional metal or compound thereof and wherein the catalyst has a total pore volume of greater than 0.3 cm.sup.3/g and the mean pore diameter is greater than or equal to 90 ?, wherein the total pore volume is measured by N2 adsorption porosimetry and the mean pore diameter is measured by N.sub.2 BET adsorption porosimetry, and wherein the at least one additional metal is selected from Li, Na, K, Ca, Mg, Cs, Sc, Al, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Co, Rh, Ir, Ni, Pd, In, Pt, Cu, Ag, Au, Zn, La, Ce and mixtures thereof.

A diesel oxidation catalyst article is provided, which includes a substrate carrier having a plurality of channels adapted for gas flow and a catalyst composition positioned to contact an exhaust gas passing through each channel. The catalyst composition includes a platinum (Pt) component and a sulfur (S)-containing component impregnated onto a refractory metal oxide support and is effective to abate hydrocarbon and carbon monoxide, as well as oxidize NO to NO.sub.2 in the exhaust gas. Methods of making and using the catalyst article are also provided, as well as emission treatment systems comprising the catalyst article.