Abstract:
The invention relates to a process for the parallel preparation of hydrogen, carbon monoxide and a carbon-comprising product, wherein one or more hydrocarbons are thermally decomposed and at least part of the pyrolysis gas formed is taken off from the reaction zone of the decomposition reactor at a temperature of from 800 to 1400° C. and reacted with carbon dioxide to form a gas mixture comprising carbon monoxide and hydrogen (synthesis gas).
Abstract:
The present invention relates to a process for producing a catalyst for the reforming of hydrocarbons, preferably methane, in the presence of CO2, water and/or hydrogen. The production of the catalyst is based on contacting of a hydrotalcite-comprising starting material with a fusible metal salt. The compounds which have been brought into contact with one another are intimately mixed and treated thermally, resulting in the fusible metal salt forming a melt. After molding, the material is subjected to a high-temperature calcination step. The metal salt melt comprises at least one metal selected from the group consisting of K, La, Fe, Co, Ni, Cu and Ce, preferably Ni. The metal salt melt more preferably comprises nickel nitrate hexahydrate. In addition, the invention relates to the use of the catalyst of the invention for the reforming of hydrocarbons, preferably methane, in the presence of CO2, water and/or hydrogen at elevated pressures which are greater than 5 bar, preferably greater than 10 bar, particularly preferably greater than 20 bar. The catalyst according to the invention is distinguished from the prior art by particular, preferred physicochemical properties.
Abstract:
Method of fracturing a subterranean formation by injecting an aqueous fracturing fluid comprising an aqueous base fluid, a polysaccharide and/or polysaccharide derivative, a crosslinker, which is a water-soluble, layered silicate and a proppant. Aqueous fracturing fluid comprising an aqueous base fluid, a polysaccharide and/or polysaccharide derivative, a crosslinker, which is a water-soluble, layered silicate and a proppant and to the use of water-soluble, layered silicates as crosslinker for aqueous fracturing fluids comprising polysaccharides and/or polysaccharide derivatives.
Abstract:
In a process for preparing an alkali metal or alkaline earth metal salt of an α,β-ethylenically unsaturated carboxylic acid, a) a transition metal-alkene complex is reacted with CO2 to give a metallalactone, b) the metallalactone is reacted with a base to give an adduct of the alkali metal or alkaline earth metal salt of the α,β-ethylenically unsaturated carboxylic acid with the transition metal complex, and c) the adduct is reacted with an alkene to release the alkali metal or alkaline earth metal salt of the α,β-ethylenically unsaturated carboxylic acid and regenerate the transition metal-alkene complex. The base is selected from alkali metal or alkaline earth metal hydroxides and alkali metal or alkaline earth metal superbases. The alkene is, for example, ethene. The transition metal complex comprises, for example, nickel and a bidentate P,P, P,N, P,O or P,carbene ligand, such as 1,2-bis(di-tert-butylphosphino)ethane.
Abstract:
A hexaaluminate-containing catalyst for reforming hydrocarbons. The catalyst consists of a hexaaluminate-containing phase, which consists of cobalt and at least one further element from the group consisting of La, Ba, and Sr, and an oxidic secondary phase. To prepare the catalyst, an aluminum source is brought into contact with a cobalt-containing metal salt solution, dried, and calcined. The metal salt solution additionally contains the at least one further element. The reforming of methane and carbon dioxide is great economic interest since synthesis gas produced during this process can form a raw material for the preparation of basic chemicals. In addition, the use of carbon dioxide as a starting material is important in the chemical syntheses in order to bind carbon dioxide obtained as waste product in numerous processes by a chemical route and thereby avoid emission into the atmosphere.
Abstract:
The invention relates to a catalytic high-pressure process for the CO2 reforming of hydrocarbons, preferably methane, in the presence of iridium-comprising active compositions and also a preferred active composition in which Ir is present in finely dispersed form on zirconium dioxide-comprising support material. The predominant proportion of the zirconium dioxide preferably has a cubic and/or tetragonal structure and the zirconium dioxide is more preferably stabilized by means of at least one doping element. In the process of the invention, reforming gas is brought into contact at a pressure of greater than 5 bar, preferably greater than 10 bar and more preferably greater than 20 bar, and a temperature which is in the range from 600 to 1200° C., preferably in the range from 850 to 1100° C. and in particular in the range from 850 to 950° C., and converted into synthesis gas. The process of the invention is carried out using a reforming gas which comprises only small amounts of water vapor or is completely free of water vapor. In the process, the formation of carbonaceous material on the catalyst is greatly suppressed while carrying out the process, as a result of which the process can be carried out over a long period of time without significant decreases in activity occurring.
Abstract:
A hexaaluminate-containing catalyst containing a hexaaluminate-containing phase which includes cobalt and at least one further element of La, Ba or Sr. The catalyst contains 2 to 15 mol % Co, 70 to 90 mol % Al, and 2 to 25 mol % of the further element of La, Ba or Sr. In addition to the hexaaluminate-containing phase, the catalyst can include 0 to 50% by weight of an oxidic secondary phase. The process of preparing the catalyst includes contacting an aluminum oxide source with cobalt species and at least with an element from the group of La, Ba and Sr. The molded and dried material is preferably calcined at a temperature greater than or equal to 800° C. In the reforming process for reacting hydrocarbons in the presence of CO2, the catalyst is used at a process temperature of greater than 700° C., with the process pressure being greater than 5 bar.
Abstract:
The invention relates to a process for the parallel preparation of hydrogen, carbon monoxide and a carbon-comprising product, wherein one or more hydrocarbons are thermally decomposed and at least part of the pyrolysis gas formed is taken off from the reaction zone of the decomposition reactor at a temperature of from 800 to 1400° C. and reacted with carbon dioxide to form a gas mixture comprising carbon monoxide and hydrogen (synthesis gas).
Abstract:
The invention relates to a nickel hexaaluminate-comprising catalyst for reforming hydrocarbons, preferably methane, in the presence of carbon dioxide, which comprises hexaaluminate in a proportion in the range from 65 to 95% by weight, preferably from 70 to 90% by weight, and a crystalline, oxidic secondary phase selected from the group consisting of LaAlO3, SrAl2O4 and BaAl2O4 in the range from 5 to 35% by weight, preferably from 10 to 30% by weight. The BET surface area of the catalyst is ≧5 m2/g, preferably ≧10 m2/g. The molar nickel content of the catalyst is ≦3 mol %, preferably ≦2.5 mol % and more preferably ≦2 mol %. The interlayer cations are preferably Ba and/or Sr. The process for producing the catalyst comprises the steps: (i) production of a mixture of metal salts, preferably nitrate salts of Ni and also Sr and/or La, and a nanoparticulate aluminum source, (ii) molding and (iii) calcination. The catalyst of the invention is brought into contact with hydrocarbons, preferably methane, and CO2 in a reforming process, preferably at a temperature of >800° C. The catalyst is also distinguished by structural and preferred properties of the nickel, namely that the nickel particles mostly have a tetragonal form and the particles have a size of ≦50 nm, preferably ≦40 nm and particularly preferably ≦30 nm, and are present finely dispersed as grown-on hexaaluminate particles. The catalyst has only a very low tendency for carbonaceous deposits to be formed.
Abstract:
In a process for preparing an alkali metal or alkaline earth metal salt of an α,β-ethylenically unsaturated carboxylic acid, a) a transition metal-alkene complex is reacted with CO2 to give a metallalactone, b) the metallalactone is reacted with a base to give an adduct of the alkali metal or alkaline earth metal salt of the α,β-ethylenically unsaturated carboxylic acid with the transition metal complex, and c) the adduct is reacted with an alkene to release the alkali metal or alkaline earth metal salt of the α,β-ethylenically unsaturated carboxylic acid and regenerate the transition metal-alkene complex. The base is selected from alkali metal or alkaline earth metal hydroxides and alkali metal or alkaline earth metal superbases. The alkene is, for example, ethene. The transition metal complex comprises, for example, nickel and a bidentate P,P, P,N, P,O or P,carbene ligand, such as 1,2-bis(di-tert-butylphosphino)ethane.