The present invention relates to a catalyst for selective hydrodesulphurization of cracked naphtha streams in the form of an extrudate, which comprises a support based on an inorganic oxide and an outer layer bound to the support, wherein the outer layer comprises desulphurization metals dispersed therein forming a crown, the desulphurization metals being cobalt and molybdenum. The present invention also relates to the preparation of said catalyst by the incipient wetness impregnation method and to the process for selective hydrodesulphurization of cracked naphtha employing same.

The present invention relates to a catalyst comprising, as catalyst components; a compound comprising at least one element X selected from the group consisting of elements belonging to Groups 3 to 6 of the periodic table; a zinc compound; and a compound comprising at least one element Y selected from the group consisting of elements belonging to Groups 7 to 11 of the periodic table, and wherein the catalyst has an average pore diameter of 2 to 50 nm.

Metal nanoparticle-bearing carbonaceous supports, or solid-supported metal-catalysts, can be formed by incipient wetness, wet impregnation and ethylene glycol reduction methods. The solid-supported metal-catalysts can be used a heterogeneous catalysts in various catalytic reactions such as hydrodeoxygenation reactions, catalyze hydrodehalogenation reactions, NN hydrogenolysis reactions and oxidation reactions. The solid-supported metal-catalysts are easy to handle, are easily separable from reaction media, are stable in various types of reaction media, and are recyclable.

An exhaust gas-purifying three-way catalyst containing: (i) base material particles of a Nd-solid dissolved zirconia-based complex oxide comprising Nd and Zr as constituent metal elements in the following mass proportions: TABLE-US-00001 ZrO.sub.2 50 to 75% by mass; and Nd.sub.2O.sub.3 25 to 50% by mass, in terms of oxides; and (ii) Pd catalyst particles supported on the base material particles, wherein the Nd-solid dissolved zirconia-based complex oxide further contains at least one or more rare earth elements selected from the group consisting of yttrium, scandium, lanthanum, and praseodymium, as a constituent metal element, in an amount of a total of more than 0% by mass to 20% by mass or less in terms of an oxide.

Provided is, for example, an exhaust gas-purifying three-way catalyst which is small in the amount of a platinum group element used, which can be early increased in temperature to a catalytically active temperature, which is suppressed in degradation in performance due to a catalyst poison included in an exhaust gas even if placed directly under an engine, and which is excellent in purification performance. An exhaust gas-purifying three-way catalyst including at least a catalyst carrier 11 and a catalyst layer 21, wherein the catalyst layer 21 has a layered structure having at least a first catalyst layer L1, a second catalyst layer L2 and a third catalyst layer L3 in the listed order, the first catalyst layer L1 contains a first composite catalyst particle including palladium supported on a first base material particle, the second catalyst layer L2 contains a second composite catalyst particle including rhodium supported on a second base material particle, the third catalyst layer L3 contains a third composite catalyst particle including palladium supported on a third base material particle, and the total coating weight Wt in the catalyst layers L1, L2, and L3 (provided that the platinum group element included in each of the catalyst layers is excluded) is 110 g/L or more and 225 g/L or less in total, per volume of the catalyst carrier 11.

A cobalt catalyst precursor is described comprising cobalt oxide crystallites disposed within pores of a titania support, wherein the cobalt oxide crystallites have an average size as determined by XRD in the range 6 to 18 nm, and the titania support is a spherical titania support with a particle size in the range 100 to 1000 m, wherein the catalyst precursor has a pore volume of 0.2 to 0.6 cm.sup.3/g and an average pore diameter in the range 30 to 60 nm, and wherein the catalyst precursor has a ratio of the average cobalt oxide crystallite size to the average pore diameter in the range 0.1:1 to 0.6:1. The catalyst precursor may be reduced to provide catalysts suitable for use in Fisher-Tropsch reactions.

This invention provides an anisotropic nanostructure represented by the formula: Ru.sub.xM.sub.1-x, wherein 0.6x0.999, and M represents at least one member selected from the group consisting of Ir, Rh, Pt, Pd, and Au, and wherein Ru and M form a solid solution at the atomic level, and the anisotropic nanostructure has an anisotropic hexagonal close-packed structure (hcp).

The invention relates to novel methods for preparing N-methyl-p-toluidine for the use thereof as additive for aviation fuel, and to specific catalysts for these methods.

A catalyst obtainable by exsolving particles of Ni, Co and/or a mixture of Ni and Co from a perovskite metal oxide of formula (I) (M.sup.1.sub.aM.sup.2.sub.b)(CO.sub.xNi.sub.yM.sup.3.sub.z)O.sub.3, wherein M.sup.1 and M.sup.2 are each independently an alkali earth metal or a rare earth metal, M.sup.3 is Ti or Cr, 0a1, 0b1, 0<a+b1, 0x<1, 0y<1, 0z<1, x+y+z=1 and where at least one of x and y>0. The invention includes methods of converting this catalyst into one or more catalytically active forms. The catalysts and the activated forms of same are useful in the catalysing CO oxidation and/or NO oxidation.

A desulfurization catalyst includes at least: 1) a sulfur-storing metal oxide, 2) an inorganic binder, 3) a wear-resistant component, and 4) an active metal component. The sulfur-storing metal is one or more of a metal of Group IIB of the periodic table, a metal of Group VB of the periodic table, and a metal of Group VIB of the periodic table, e.g., zinc. The desulfurization catalyst has a good stability and a high desulfurization activity.