摘要:
An artificial photosynthesis module includes an oxygen generation electrode having a first photocatalyst layer that decomposes water with light to generate oxygen, and has a first substrate, a first conductive layer, a first photocatalyst layer, and a first co-catalyst, and a hydrogen generation electrode that decomposes water with light to generate hydrogen and has a second substrate, a second conductive layer, a second photocatalyst layer, and a second co-catalyst. This provides an artificial photosynthesis module with high reaction efficiency.
摘要:
The present invention relates to a process for producing a supported tin-comprising catalyst, wherein a solution (S) comprising tin nitrate and at least one complexing agent is applied to the support, where the solution (S) does not comprise any solid or has a solids content of not more than 0.5% by weight based on the total amount of dissolved components.
摘要:
The present invention relates to modified catalyst supports, to processes for making modified catalyst supports, and to chemical processes employing catalysts that comprise such modified catalyst supports. The modified catalyst support comprises a first metal, a second metal and a support modifier on a support, wherein the support modifier comprises a support modifier metal selected from the group consisting of tungsten, molybdenum, vanadium, niobium, and tantalum.
摘要:
Oxidative dehydrogenation of paraffins to olefins provides a lower energy route to produce olefins. Oxidative dehydrogenation processes may be integrated with a number of processes in a chemical plant such as polymerization processes, manufacture of glycols, and carboxylic acids and esters. Additionally, oxidative dehydrogenation processes can be integrated with the back end separation process of a conventional steam cracker to increase capacity at reduced cost.
摘要:
Disclosed are catalysts in powdered form comprising a major amount of the oxides of a first metal selected from copper or zinc, a second metal selected from chromium, molybdenum, tungsten and vanadium, and optionally, a minor amount of the oxide of a promoter metal selected from the group consisting of manganese, barium, zinc, nickel, cobalt, cadmium, iron and any combination thereof provided that the promoter metal is not zinc if the first metal is zinc, wherein the average particle diameter of the powder is from about 6 to about 20 microns; and the particle surface area is from about 20 to about 70 m.sup.2 /g. Also disclosed is a process for preparing such catalysts and a process for hydrogenating aldehydes, ketones, carboxylic acids and carboxylic acid esters with catalysts of the type described.
摘要:
The present invention relates to a process for producing a supported tin-comprising catalyst, wherein a solution (S) comprising tin nitrate and at least one complexing agent is applied to the support, where the solution (S) does not comprise any solid or has a solids content of not more than 0.5% by weight based on the total amount of dissolved components.
摘要:
When a heavy fuel oil with a sulfur content of 1 percent by mass or lower is produced from a feedstock consisting of a heavy hydrocarbon oil derived from a heavy crude oil having an API degree of 30 or less and containing sulfur and metal components in amounts larger than those of ordinary crude oil, the conventional processes requires higher reaction temperature and was accompanied with a remarkably enhanced deactivation rate of the catalyst which results in a remarkable shortened lifetime thereof. Therefore, it is regarded as substantially impossible to treat the feedstock. However, the present invention makes it possible to produce a low sulfur heavy fuel oil with a sulfur content of 1 percent by mass or less by hydrotreating a mix oil of 100 parts by volume of a heavy hydrocarbon oil derived from a heavy crude oil with an API degree of 30 or less and 30 to 1000 parts by volume of a heavy hydrocarbon oil derived from a light crude oil with an API degree of 35 or greater, without lowering the degree of demetallization while retarding the deactivation rate of the catalyst.
摘要:
Processes for oxidative dehydrogenation of alkane to one or more olefins, exemplified by ethane to ethylene, are disclosed using novel catalysts. The catalysts comprise a mixture of metal oxides having as an important component nickel oxide (NiO), which give high conversion and selectivity in the process. For example, the catalyst can be used to make ethylene by contacting it with a gas mixture containing ethane and oxygen. The gas mixture may optionally contain ethylene, an inert diluent such as nitrogen, or both ethylene and an inert diluent.
摘要:
A composition comprising a promoter and a metal oxide selected from the group consisting of a niobium oxide, a tantalum oxide, and combinations thereof, wherein at least a portion of the promoter is present as a reduced valence promoter and methods of preparing such composition are disclosed. The thus-obtained composition is employed in a desulfurization zone to remove sulfur from a hydrocarbon stream.
摘要:
This hydrogenation catalyst comprises a major amount of the oxides of a first metal selected from copper or zinc, a second metal selected from chromium, molybdenum, tungsten and vanadium, and optionally, a minor amount of the oxide of a promoter metal selected from the group consisting of manganese, barium, zinc, nickel, cobalt, cadmium, iron and any combination thereof provided that the promotor metal is not zinc if the first metal is zinc. The average particle diameter of the powder is from about 6 to about 20 microns; and the particle surface area is from about 20 to about 70 m.sup.2 /g. The process for preparing this catalyst comprises the steps of(A) simultaneously and adding to a first vessel, (1) a first aqueous solution comprising a copper or zinc salt; (2) a second aqueous solution comprising a soluble base, provided that either the copper solution or the soluble base solution also contains a soluble salt of at least one second metal; or (3) a third aqueous solution comprising a soluble salt of at least one seocnd metal is added simultaneously to the first vessel whereby an aqueous slurry of insoluble solid is formed in the first vessel, provided further that the second metal is chromium, molybdenum, tungsten, or vanadium;(B) advancing at least a portion of the aqueous slurry from the first vessel to a second vessel;(C) recovering the solids from the aqueous slurry in the second vessel; and(D) calcining the recovered solids.