Abstract:
Finely divided, high surface area, small crystallite (0.1 micron or less) di- and poly-transition metal chalcogenides are prepared by mixing in the absence of an aqueous solvent a transition metal salt with a source of chalcogen yielding a precipitate. The salt and the chalcogen source can be mixed either neat or in the presence of a nonaqueous solvent. The precipitate which results before removal of the anion salt is a finely divided product.
Abstract:
Thermonuclear fuel elements used as targets which are radiated by pulse laser radiation of high energy level to produce laser fusion as for thermonuclear energy generation are made out of materials not heretofore available for such use. Such materials are deuterium compounds which could not be fabricated into spheres suitable for laser fusion targets by the melting or freezing methods of fabricating such fuel elements which were heretofore available, since such compounds are peritectic (viz., they decompose or sublimate before melting can occur). By grinding bodies of such deuterium compounds, laser fuel elements are provided of the requisite minute size and spherical configuration such that they are available for use in quantity as thermonuclear fuel elements in laser fusion apparatus.
Abstract:
Certain embodiments are directed to method for making and using an alkali promoted transition metal sulfide Fischer Tropsch catalyst. Certain embodiments are directed to alkali promoted transition metal sulfide Fischer Tropsch catalyst synthesized using steps comprising (i) mixing an ammonium tetrathiomolybdate (ATM) precursor compound with an alkali metal compound and molybdenum disulfide in deionized water to form a reaction mixture, (ii) heating the reaction mixture at a temperature of at least 200, 250, 300, 350, 400C at a pressure of at lease 900, 1000, 1100, 1500, 2000 psi for more than 0.5 1, 1.5, 2.0, 3 or more hours to form a reaction product, (iii) filtering, washing, and drying the reaction product.
Abstract:
Apparatus and methods are described using asphaltene and its derivatives as semi-conducting materials in photovoltaic cells. Asphaltene is used in an organic PV device as either or both of a p-type material and/or n-type material. The asphaltene-based material can be treated such as by de-metalization, metal addition, extraction, fractionation, and optimization of the asphaltene material. Treatment can be selected to create an asphaltene-based material having pre-selected characteristics, such as absorption value, reflectance, index of refraction, band gap, etc. The asphaltene-based materials can be blended or otherwise combined with inorganic or non-asphaltene organic materials. Further, asphaltene material can be used as an interfacial layer in the PV device.
Abstract:
Hydrocarbon feedstocks are selectively hydrodesulfurized by contacting the feedstock in the presence of hydrogen with a predecessor catalyst comprising molybdenum or tungsten sulfide which has been promoted by reaction with a transition metal containing organo-metallic complex wherein the valence of the metal is 0 or +1 at the time of reaction and the contacting is done at a temperature and pressure sufficient to substantially hydrodesulfurize the hydrocarbon.
Abstract:
A novel slurry hydrotreating process is described which employs a hydrotreating catalyst of small particle size having a quantity of catalyst sites in excess of those required for reaction and/or adsorption of nitrogen compounds in the petroleum or synfuel feed being treated. The excess catalyst sites can therefore in effect be contacted with a low nitrogen or essentially zero nitrogen feed, allowing rapid hydrogenation of aromatics at low temperatures where equilibrium is favored. In a further aspect of the invention, the catalyst which contains adsorbed nitrogen is activated by high temperature denitrogenation.
Abstract:
This invention relates to a process for the preparation of promoted molybdenum and tungsten sulfide catalysts, the catalysts prepared by such process, and to the use of such catalysts for hydroprocessing processes, particularly hydrotreating. More particularly, this invention relates to the preparation and use of promoted catalysts useful for hydroprocessing processes such as hydrotreating wherein said catalysts are formed by treating molybdenum and tungsten sulfide-containing material (which may be supported) with a low valence promoter metal selected from transition metals particularly the group of Fe, Co, Ni.
Abstract:
Hydrocarbon feeds are upgraded by contacting a feed, at elevated temperature and in the presence of hydrogen, with a catalyst comprising an amorphous sulfide of iron and a metal selected from the group consisting of Mo, W and mixture thereof. The catalysts are prepared by heating one or more catalyst precursor salts under oxygen-free conditions in the presence of sulfur at a temperature of at least about 250.degree. C. The precursor salts will contain a thiometallate anion of Mo, W or mixture thereof and a cation comprising iron as a promoter metal and, optionally, additional divalent promoter metals, wherein said promoter metal or metals are chelated by at least one neutral, nitrogen-containing polydentate ligand and wherein said additional promoter metal is selected from the group consisting of Ni, Co, Mn, Zn, Cu and mixture thereof.
Abstract:
A catalyst composition comprising an amorphous sulfide of trivalent chromium and at least one metal selected from the group consisting of (a) molybdenum, tungsten and mixture thereof and (b) mixtures of (a) with Fe, Ni, Co, Mn, Cu, Zn and mixture thereof is prepared by heating one or more precursors at a temperature of at least about 200.degree. C. under oxygen-free conditions in the presence of a sulfur, wherein said precursor is selected from the group consisting of [Cr.sub.1-z M.sub.z LX.sub.y ](MoS.sub.4).sub.n, [Cr.sub.1-z M.sub.z LX.sub.y ](WS.sub.4).sub.n and mixtures thereof, wherein M is one or more divalent promoter metals selected from the group consisting of Mn, Fe, Co, Ni, Cu, Zn and mixtures thereof, wherein L is one or more neutral nitrogen-containing ligands, wherein ligand X is a singly-charged anionic species and wherein 1>z.gtoreq.0, 1-z.gtoreq.y.gtoreq.0, and wherein n equals (3-z-y)/2. These compositions have been found to be good hydroprocessing catalysts, particularly hydrotreating catalysts exhibiting a very high hydrodenitrogenation activity and/or selectivity in nitrogen and sulfur-containing hydrocarbon feeds.
Abstract:
Supported hydroprocessing catalysts comprising a sulfide of trivalent chromium and molybdenum or tungsten which optionally may contain one or more promotor metals such as Co, Fe, Ni and mixture thereof. These catalysts are obtained by comprising a preselected quantity of support material with a precursor salt containing a tetrathiometallate anion of Mo or W and a cation comprising trivalent chromium and, optionally, one or more promoter metals wherein both said trivalent chromium and promoter metal are chelated by at least one neutral, nitrogen-containing polydentate ligand and heating the composite in the presence of sulfur and hydrogen in an oxygen-free atmosphere. These catalysts have high selectivity for nitrogen removal. The chromium and promoter metal do not have to be in the same cation.