A process for ring hydrogenation of dialkyl terephthalates having C.sub.3- to C.sub.16-alkyl groups can be performed in a hydrogenation unit composed of two reaction units in series. In the process, a suitable process parameter in relation to the first reaction unit is adjusted so that a certain reaction conversion is achieved.

A molding catalyst satisfying the following formula (1):

0.800≤W.sub.AV/W.sub.C≤0.875  (1) wherein W.sub.AV is determined by the following formula (2) and W.sub.C is determined by the following formula (3):

W.sub.AV=W.sub.tot/n  (2) wherein W.sub.tot is a total weight of freely-selected n pieces of the molding catalyst,

W.sub.C=(V.sub.AV.Math.ρ)/(1+V.sub.P.Math.ρ)  (3) wherein V.sub.AV is an average of volumes of virtual cylinders each respectively having, as its height and diameter, a major axis (L) and a minor axis (D) of each of the freely-selected n pieces of the molding catalyst, ρ is a true density of the molding catalyst, and V.sub.P is a pore volume per unit weight of the molding catalyst.

A precious metal-supported eggshell catalyst with a preparation method and an application are provided. The precious metal-supported eggshell catalyst includes a carrier, a precious metal and a promoter. As an active component, the precious metal and the promoter are evenly distributed on surface of the carrier, wherein the promoter includes one or more than two of a precious metal, an alkaline earth metal, a transition metal lanthanide series metal, an actinium series metal and/or a metal oxide thereof. With a highly utilization of the precious metal, the precious metal-supported eggshell catalyst showed high conversion, good selectivity and excellent stability, and the precious metal-supported eggshell catalyst is used more than 300 hours with no obvious loss of activity in preparing 1,3-propanediol through hydrogenation of 3-hydroxypropionaldehyde aqueous solution. Furthermore, with large particles the precious metal-supported eggshell catalyst is easily separated from reaction products.

The invention relates to a process for preparing methyl mercaptan from a mixture of carbon oxide, hydrogen sulfide and hydrogen, in the presence of a catalyst based on molybdenum and potassium supported on zirconia, said catalyst not comprising any promoter.

Presented is a selective hydrogenation catalyst and a method of making the catalyst. The catalyst comprises a carrier containing bi-metallic nanoparticles. The nanoparticles comprise a silver component and a palladium component. The catalyst is made by incorporating an aqueous dispersion of the bi-metallic nanoparticles onto a catalyst carrier followed by drying and calcining the carrier having incorporated therein the dispersion. The catalyst is used in the selective hydrogenation of highly unsaturated hydrocarbons contained olefin product streams.

The present invention relates to a process for preparing liquid hydrocarbons by the Fischer-Tropsch process integrated into refineries, in particular comprising recycling streams from the steam reforming hydrogen production process as the feedstock for the Fischer-Tropsch process.

Catalyst systems containing a titanium alkoxymagnesium halide supported catalyst component can be used for the polymerization of olefins. The catalyst can be prepared from a microcrystalline solid alkoxymagnesium halide support having a lattice spacing in the 5 nm to 15 nm range.

The PEO grown metal-oxide coated electrocatalyst replaces the current carbon supported catalyst with a more robust and effective metal-oxide scaffold, which increases the lifetime and efficiency of fuel cells and electrolyzers. Using a novel method in catalyst ion and nanoparticle application to the electrocatalyst scaffold, we can increase the lifetime by reducing particle dissolution, resulting in longer acceptable efficiencies. The process also has lower infrastructure and upkeep costs to those currently employed, so savings can be passed on to the consumer.

The present invention relates to a process for the production of butadiene by condensation of ethanol using a catalyst containing sillica-supported elements from group 3A and group 4B of the periodic table. The catalyst of the present invention has high activity and selectivity to butadiene in the synthesis reaction of said olefin from ethanol.

The invention relates to an aerogel concrete mixture containing a photocatalyst, a photocatalytically active high-performance aerogel concrete obtainable therefrom and a method for producing same.