The invention provides an oxygen storage material having high oxygen storage capacity and high thermal durability. The oxygen storage material of the invention has some of the La sites of La.sub.2CuO.sub.4 with a K.sub.2NiF.sub.4-type crystal structure replaced by Ce. The oxygen storage material may have the composition La.sub.(2.00-x)Ce.sub.xCuO.sub.4 (0.20x>0.00). The oxygen storage material may also have a precious metal supported. The precious metal may be Pt, Pd or Rh. The exhaust gas purification catalyst is an exhaust gas purification catalyst comprising an oxygen storage material according to the invention.

The invention is directed to a CO to CO.sub.2 combustion promoter comprising microsphere sized porous silica and/or alumina comprising particles further comprising on or more Group VIII noble metals wherein the noble metal is distributed in the particle as an eggshell such that a higher content of noble metal is present in the outer region of the particle as compared to the content of noble metal in the center of the particle.

In a first aspect, the present invention is directed to a process for forming a metal alloy catalyst. Another aspect of the present invention is directed to a process for oxidizing a substrate that includes contacting a substrate with an oxidant in the presence of a metal alloy catalyst to form one or more carboxylic acids. Suitable substrates include sugars, polyols, furfural alcohols, and polyhydroxycarboxylic acids. The oxidation process may use the alloy catalyst formed from the process of the first aspect of the invention.

A diesel oxidation catalyst composition is provided, the composition including at least one platinum group metal impregnated onto a porous refractory oxide material in particulate form and at least one base metal oxide impregnated onto a porous refractory oxide material in particulate form, wherein the porous refractory oxide material impregnated with at least one platinum group metal and the porous refractory oxide material impregnated with at least one base metal oxide are in the form of a mixture or wherein the at least one platinum group metal and the at least one base metal oxide are impregnated on the same porous refractory oxide material. The diesel oxidation catalyst provides synergistic enhancement of carbon monoxide oxidation as well as relatively unimpaired hydrocarbon oxidation. Methods of making and using the catalyst composition are also provided, as well as emission treatment systems comprising a catalyst article coated with the catalyst composition.

The present invention relates to a catalyst for aminating a polyether polyol and preparation method thereof and a method of preparing a polyetheramine using the catalyst. The catalyst has active components and a carrier. The active components are Ni, Cu, and Pd. The method of preparing the catalyst comprises the following steps: using a metal solution or a metal melt impregnated carrier, obtaining a catalyst precursor; and drying and calcinating the obtained catalyst precursor, so as to obtain a catalyst. By introducing the active component Pd in the catalyst, the present invention clearly improves selectivity of an amination catalyst with respect to a preaminated product, and increases raw material conversion rate.

A mixed metal oxide solid acid catalyst composition is disclosed which provides substantially improved conversion for hydrocarbon transformation reactions namely, alkylation and isomerization. The catalyst composition includes a sulfate ion, Platinum group metal and a mixed metal oxide support material bearing molecular formula:

x.sub.1ZrO.sub.2.x.sub.2Al.sub.2O.sub.3.x.sub.3Yb.sub.2O.sub.3.x.sub.4CuO

wherein the molar coefficients for individual metal oxides are as follows:
x1=55 to 7510.sup.2; x2=12 to 2510.sup.2; x3=1 to 610.sup.2 and x4=0.1 to 510.sup.2;

The concentration of the sulfate ion on the aforementioned catalyst support is between 5 to 17 wt % and that of Platinum group metal is 0.05 to 2.0 wt %.

An after treatment system is disclosed. The after treatment system may include a three-way catalyst (TWC), a selective catalytic reduction (SCR) catalyst, and a CO clean-up catalyst (CUC) on an exhaust pipe through which an exhaust gas flows. The CUC may include a zeolite in which Cu and Fe are ion-exchanged and CeO.sub.2 in which Pt is supported, wherein a weight ratio of the CeO.sub.2 to a total weight of the CUC is 30-70 wt % such that the CUC purifies NH.sub.3 at a lean air/fuel ratio and purifies NH.sub.3 during a delay time at a rich air/fuel ratio.

The invention provides a composite catalyst containing a first component and a second component. The first component contains a ternary mixed metal oxide. The second component contains a platinum group metal. The composite catalyst is useful for catalyzing the low temperature oxidation of carbon monoxide and hydrocarbons.

The invention provides a composite catalyst containing a first component and a second component. The first component contains a ternary mixed metal oxide. The second component contains a platinum group metal. The composite catalyst is useful for catalyzing the low temperature oxidation of carbon monoxide and hydrocarbons.

Catalyst compositions, articles, systems and methods related to a three-way-catalyst composition comprising alumina doped with a transition metal.