摘要:
Sulfur and nitrogen-containing hydrocarbon feeds are upgraded by contacting said feed, at elevated temperature and in the presence of hydrogen, with a catalyst comprising a carbon-containing sulfide of a catalytic metal selected from the group consisting of tungsten, molybdenum and mixture thereof. In a preferred embodiment, these catalysts are promoted with certain transition metal sulfides such as cobalt sulfide. The catalyst may be preformed or formed in-situ in the feed or from catalyst precursor salts.
摘要:
A supported carbon-containing molybdenum sulfide and tungsten sulfide catalyst useful for conducting methanation and hydrotreating reactions, principally the latter, can be formed by compositing a preselected quantity of a porous, refractory inorganic oxide with a complex salt characterized by the formulaB.sub.x [MO.sub.y S.sub.4-y ]where B is an organo or hydrocarbyl substituted diammonium ion, an organo or hydrocarbyl substituted ammonium ion or quaternary ammonium ion, or an ionic form of a cyclic amine containing one or more basic N atoms, x is 1 where B is an organo or hydrocarbyl substituted diammonium ion, or 2 where B is an organo or hydrocarbyl substituted ammonium or quaternary ammonium ion or an ionic form of a cyclic amine containing one or more basic N atoms, M is molybdenum or tungsten, and y is 0, or a fraction or whole number ranging up to 3, and heat decomposing the salt of said catalyst precursor composite in the presence of hydrogen sulfide and hydrogen to form said supported carbon-containing molybdenum sulfide or tungsten sulfide catalyst.
摘要:
Finely divided, small particle (0.1 micron or less) small crystallite (about 50 A.times.100 A or less) chalcogenides of manganese, rhenium and technetium are described. These compositions are prepared by mixing the absence of an aqueous solvent, a manganese, rhenium or technetium salt with a source of chalcogenide yielding a precipitate. The manganese, rhenium or technetium salt and the source of chalcogen can be mixed either neat or in the presence of a nonaqueous aprotic solvent. The precipitate which results before removal of the anion salt is a finely divided product. In the case of rhenium dichalcogenide the product possesses a layered structure. The anion salt may be removed by any technique common to the art, pumping under vacuum being one such technique, washing with a suitable solvent being another.A method is described for the preparation of di- and poly-chalcogenides of the formula MX.sub.y wherein M is a metal selected from the group consisting of mangangese, rhenium and technetium, X is a chalcogen selected from the group consisting of sulfur, selenium, tellurium and mixtures thereof, and y is a number ranging from about 1.5 to about 4, preferably about 2, comprising the low temperature, nonaqueous precipitation of said MX.sub.y compounds from mixtures of the salts of said manganese, rhenium and technetium. Said precipitation occurs in the absence of aqueous solvents. The process of the instant invention permits the preparation of materials uncontaminated by water, oxygen or hydrolysis products.
摘要:
A method is described for the preparation of chalcogenides of ruthenium, rhodium, osmium and iridium transition metals of the Periodic Table of the Elements which comprises mixing in the absence of an aqueous solvent a Group VIII transition metal salt with a source of chalcogenide, said chalcogenide being selected from the group consisting of sulfur, selenium, tellurium and mixtures thereof, yielding a precipitate of the formula MX.sub.y wherein M is selected from the group consisting of ruthenium, rhodium, osmium and iridium, X is sulfur, selenium, tellurium and mixtures thereof and y is a number ranging from about 0.1 to about 3, preferably 0.1 to about 2.5. By the practice of the nonaqueous synthesis technique, Group VIII chalcogenides are prepared which are finely divided, have a high surface area, small particle size and small crystallite size which are also free of excess sulfur, water and/or hydrolysis products. This technique also permits the preparation of a heretofore unobtainable composition, layered stoichiometric osmium disulfide. The precipitates which result as a consequence of the instant process may be cleansed of any anion salt coproduct by any technique common to the art, pumping under vacuum being one such technique, washing with a suitable solvent being another.Compounds of the formula MX.sub.y wherein M, X and y are as defined above, prepared by the low temperature, nonaqueous precipitation technique herein disclosed are superior sulfur-tolerant catalysts in catalytic processes, for example, hydrodesulfurization, hydrodenitrogenation, hydroconversion, hydrogenation.
摘要:
The present invention is directed to an electric current-producing cell which contains:A cathode having as its cathode-active material one or more vanadium compounds selected from:(i) those having the formula:V.sub.a Z.sub.b (1) wherein Z is a chalcogen selected from the group consisting of sulfur, selenium, and sulfur-selenium mixtures, wherein a is a numerical value of about 2, and wherein b is a numerical value of bout 4.5 to about 7;(ii) those having the formula:(NA.sub.4).sub.x VZ.sub.y (2) wherein Z is a chalcogen selected from the group consisting of sulfur, selenium, and sulfur-selenium mixtures, wherein x is a numerical value of about 2 to about 4, and wherein y is a numerical value of about 3 to about 5; and,(iii) those having the formula:H.sub.m (NH.sub.4).sub.n VZ.sub.y (3) wherein Z is a chalcogen selected from the group consisting of sulfur, selenium, and sulfur-selenium mixtures, wherein m is a numerical value of about 1 to about 3 and n is a numerical value of about 1 to about 3, subject to the proviso that the sum of m and n is numerical value of about 2 to about 4, and wherein y is a numerical value of about 3 to about 5. A preferred cathode-electrode material is V.sub.a Z.sub.b wherein Z is sulfur, a is about 2, and b is about 4.5 to about 5.5. Desirably, this preferred material is obtained from the thermal or chemical decomposition of ammonium thiovanadate (NH.sub.4).sub.3 VS.sub.4.
摘要:
A zero-discharge landfill process is disclosed herein. The process described in the present invention recycles the exhaust gases from a combustion engine which reheats the landfill and provides moisture. Additionally, the CO2 from the exhaust gases releases additional methane. Methane production in landfills can thus be enhanced by the method of the present invention. Furthermore, a portion of the exhaust gas can be used to cultivate algae in a cultivation tank. The cultivation of the algal species is enhanced in the presence of water, CO2, CO, and the elevated temperatures. Optionally, a first portion of the cultivated algae can be passed through the landfill to increase methane production in the landfill and a second portion of the cultivated algae can be transferred to a biodiesel production tank, for the conversion of the one or more algal oils and lipids to a biodiesel or a biofuel by a transesterification reaction.
摘要:
Photovoltaic devices and methods of making the same, are disclosed herein. The cell comprises: a first electrically conductive layer; at least one photoelectrochemical layer comprising metal-oxide particles, an electrolyte solution, an asphaltene dye, and a second electrically conductive layer.
摘要:
The present invention involves methods and compositions for synthesizing catalysts/porous materials. In some embodiments, the resulting materials are amorphous sulfide sieves that can be mass-produced for a variety of uses. In some embodiments, methods of the invention concern any suitable precursor (such as thiomolybdate salt) that is exposed to a high pressure pre-compaction, if need be. For instance, in some cases the final bulk shape (but highly porous) may be same as the original bulk shape. The compacted/uncompacted precursor is then subjected to an open-flow hot isostatic pressing, which causes the precursor to decompose and convert to a highly porous material/catalyst.
摘要:
Disclosed is a method for catalytically hydropyrolyzing carbonaceous material to produce liquid products boiling under about 550.degree. C. with reduced amounts of methane being formed. The process comprises (a) treating the carbonaceous material with as hydrogenation catalyst; (b) contacting the so-treated carbonaceous material with an effective amount of hydrogen, at an effective residence time, at a temperature below the critical temperature of rapid methane formation; (c) recovering the resulting liquids, gases, and char; and (d) recycling the char.
摘要:
An eta phase composition in powder form, prepared in the absence of sulfur or sulfur bearing compounds, having a surface area greater than about 2m.sup.2 /g and consisting of X.sub.6 Y.sub.6 Z.sub.a wherein X is at least one element selected from the group consisting of Mo and W, Y is at least one element selected from the group consisting of Fe, Co, Ni, Mo and W, Z is at least one element selected from the group consisting of C, N and combinations thereof such that when Z is N, a is greater than or equal to 1 but less than or equal to 2 and when Z is C, a is greater than 1 but less than or equal to 2 except when Z is C and Y is Fe, then a is greater than or equal to 1 but less than or equal to 2. The eta phase may be a carbide, nitride or carbonitride. A method for producing the eta-phase composition includes providing a precursor compound including at least two eta-phase forming metals, and a ligand containing carbon, nitrogen or combinations thereof. The precursor compound is thermally decomposed in a nonoxidizing atmosphere, free of sulfur or sulfur bearing compounds, and reacts with carbon or nitrogen derived from the decomposition of the ligand with the metals to form the eta-phase. The eta phase forming metals are at least two of the metals tungsten, molybdenum, nickel, cobalt and iron. These eta-phase composition may be used for producing or converting hydrocarbons or alchols. This includes hydrogenation of CO (to produce at least one hydrocarbon or at least one alcohol and hydrogenation of unsaturated hydrocarbons, aromatic hydrocarbons and olefinic hydrocarbons), isomerization and dehydrogenation.