4219 results about "Sulfidation" patented technology

Particulate sorbent compositions comprising a mixture of zinc oxide, silica, alumina and a substantially reduced valence nickel are provided for the desulfurization of a feedstream of cracked-gasoline or diesel fuels in a desulfurization zone by a process which comprises the contacting of such feedstreams in a desulfurization zone followed by separation of the resulting low sulfur-containing stream and sulfurized-sorbent and thereafter regenerating and activating the separated sorbent before recycle of same to the desulfurization zone.

The invention relates to a tool, especially a cutting insert for cutting metallic materials, which consist of a hard metal, cermet ceramics or steel base, especially of a high speed steel base, and at least one layer deposited thereon. The single layer, or in the case of several layers the outer layer or the layer underneath the outer layer, contains molybdenum sulfide. The aim of the invention is to improve the resistance to wear of the friction-reducing, molybdenum sulfide containing layer even at high pressures. To this end, the molybdenum sulfide containing layer consists of an alternating sequence of two layer that are different from one another. The first layer contains 51 to 100% by weight of metallic molybdenum and the second layer contains 21 to 100% by weight of MoS2 which substantially consists of hexagonal crystals that are at least substantially oriented in a plane parallel to the tool surface.

The invention relates to a novel rhodium sulfide catalyst for the reduction of oxygen in industrial electrolyzers. The catalyst is highly resistant towards corrosion and poisoning by organic species, thus resulting particularly suitable for use in aqueous hydrochloric acid electrolysis, when technical grade acid containing organic contaminants is employed.

The invention pertains to a process for preparing a sulfided hydrotreating catalyst in which a hydrotreating catalyst is subjected to a sulfidation step, wherein the hydrotreating catalyst comprises a carrier comprising at least 50 wt % of alumina, the catalyst comprising at least one hydrogenation metal component and an organic compound comprising at least one covalently bonded nitrogen atom and at least one carbonyl moiety, the molar ratio between the organic compound and the total hydrogenation metal content being at least 0.01:1. The invention further pertains to the use of said hydrotreating catalyst in hydrotreating a hydrocarbon feed, in particular to achieve hydrodenitrogenation, (deep) hydrodesulfurization, or hydrodearomatization.

The present application relates to methods for producing a lubricant base oil from a waxy hydrocarbon feed using a sulfided shape selective, intermediate pore size, noble metal-containing molecular sieve catalyst. According to the present invention, a shape selective, intermediate pore size, noble metal-containing molecular sieve catalyst is sulfided to provide a sulfided catalyst, wherein the molar ratio of sulfur to noble metal in the sulfided catalyst is greater than one, and a waxy hydrocarbon feed is hydroisomerized by contacting the waxy hydrocarbon feed with the sulfided catalyst at hydroisomerization conditions, to produce a lubricant base oil.

A fuel processing system is operable to remove substantially all of the sulfur present in an undiluted hydrocarbon fuel stock supply used to power a fuel cell power plant in a mobile environment, such as an automobile, bus, truck, boat, or the like, or in a stationary environment. The power plant hydrogen fuel source can be gasoline, diesel fuel, naphtha, light hydrocarbon fuels such as butane, propane, natural gas, or other like fuels which contain relatively high levels of organic sulfur compounds such as mercaptans, sulfides, disulfides, and the like. The undiluted hydrocarbon fuel supply is passed through a nickel desulfurizer bed wherein essentially all of the sulfur in the organic sulfur compounds react with the nickel reactant, and are converted to nickel sulfide while the desulfurized organic remnants continue through the remainder of the fuel processing system. The system does not require the addition of steam or a hydrogen source to the fuel stream prior to the desulfurizing step. The system operates at relatively low temperatures and can be used to desulfurize either a liquid or a gaseous fuel stream.

The invention discloses a method for precuring hydrogenation catalyst and a hydrogenation process operation method. During the presulfurization of the catalyst, intake of curing ingredient for partially precuring the catalyst is much more than theoretical sulfur demand of active hydrogenation metal in the catalyst. Precured hydrogenation catalyst and the hydrogenation catalyst which is not precured are mixed or layered in a reactor, and by operation and activation all catalyst is effectively cured. The method of the invention can precure the required catalyst, shorten the production period for precuring the catalyst, reduce the production cost and enhance economic benefit.

The invention discloses a preparation method of a hydro-treatment catalyst. The preparation method comprises the following steps: preparing an alumina carrier, preparing an impregnation solution containing the VIII group metal and VIB group metal, wherein the impregnation solution comprises a proper amount of an organic auxiliary agent containing chelating ligand, then impregnating the alumina carrier into the impregnation solution under a proper ultrasonic treatment condition, and drying so as to obtain the hydro-treatment catalyst. The preparation method utilizes the ultrasonic cavitation effect to properly reduce the viscosity of the impregnation solution; at the same time the complexing capacity between the chelating ligand in the organic auxiliary agent and nickel / cobalt is improved by the catalytic function of the ultrasonic, the interaction force between the chelating ligand and nickel / cobalt is strengthened, thus the active metal component is promoted to highly disperse on the carrier surface, furthermore, the existing state of the active metal on the catalyst surface is improved at the same time, the sulfurization degree and sulfurization uniformity of the active metal are both improved, so the activity and stability of the catalyst are both improved. The catalyst is especially suitable for being used in the hydro-denitrogenation process and hydro-desulfurization process of heavy distillate oil.

The invention relates to a cobalt-intercalated molybdenum sulfide secondary battery material and a preparation method and an application thereof. A three-dimensional cobalt-intercalated molybdenum sulfide multi-level structure is prepared by adopting a chemical solution method; firstly, a cobalt salt, a molybdenum salt and a sulfur source are dispersed into a solvent to prepare a reaction liquid; and then the prepared reaction liquid is subjected to solvent thermal treatment to obtain the three-dimensional cobalt-uniformly-intercalated molybdenum sulfide multi-level structure which is self-assembled by graphene-like ultra-thin nanosheets, wherein the size of the multi-level structure is about 100nm. The invention also discloses a preparation method for the multi-level structure. The secondary battery material prepared by the method is stable in nanomaterial performance, and long in cycle life when the secondary battery material is used as a negative electrode material of a lithium ion battery and an electrode material of a supercapacitor.

The present invention provides methods of synthesizing molybdenum disulfide (MoS2) and carbon-containing molybdenum disulfide (MoS2-xCx) catalysts that exhibit improved catalytic activity for hydrotreating reactions involving hydrodesulfurization, hydrodenitrogenation, and hydrogenation. The present invention also concerns the resulting catalysts. Furthermore, the invention concerns the promotion of these catalysts with Co, Ni, Fe, and / or Ru sulfides to create catalysts with greater activity, for hydrotreating reactions, than conventional catalysts such as cobalt molybdate on alumina support.

The invention relates to a carbon quantum dot, precious metal and zinc indium sulfide composite photocatalyst and a preparation method thereof. The composite photocatalyst contains a hexagonal-phase zinc indium sulfide (ZnIn2S4) matrix, and reduced carbon quantum dots and precious metal particles which are carried on the surface of the ZnIn2S4 matrix, wherein the ZnIn2S4 matrix is of a peony-flower-shaped structure, the particle size of the matrix is 0.1-10 micrometers and the BET specific surface area of the matrix is 10-200 m<2> / g; the particle size of the carbon quantum dots and the precious metal particles is 1-10 nm; precious metal refers to one or a mixture of some of gold, platinum, silver or palladium. The composite photocatalyst has high catalytic activity (with a hydrogen production rate up to 1mmol.h<-1>g<-1>) under irradiation of visible light (more than or equal to 400nm), and has long service life (over 50 hours).

The invention discloses a lead and zinc flotation method to ferreous blende and pyrrhotite typed complex lead zinc silver sulphide ore, mainly comprising lead ore branch flotation which controls the electrochemical conditions of the flotation and the zinc and sulfur flotation separation which controls the electrochemical conditions of the flotation. The invention has the advantages of implementing the lead-zinc sulfur separation by adopting twice branch flotation, carrying out fast flotation to the lead ore by using a novel composite catching agent to the galena and silver ore with easy floating coarse grains under the conditions of higher ore pulp potential and low pH; the normal flotation of the lead ore with difficultly floated fine grains is carried out under the conditions of lower ore pulp potential and high pH. The pH of the ore pulp is adjusted to more than 12 by lime for the gangue after the lead is floated; the iron blende is activated by bluestone; the iron blende is recovered by the catching agent with the same type of the lead sulfide floatation, thus leading the property of the lead flotation waste water to be basically consistent with that of the zinc flotation waste water and being beneficial for the circular application of floatation waste water.

The present invention relates to a low phosphorus lubricating oil composition for internal combustion engines which demonstrates fuel economy benefits while also providing high temperature oxidation, piston deposits, and wear. The lubricating oil composition of the present invention comprises: a) major amount of a base oil of lubricating viscosity; b) from about 0.1 to 10 wt % of an overbased alkaline earth metal alkyl aryl sulfonate detergent having a total base number (TBN) of about 25 to 500; c) from about 0.02 to 10 wt % of a oxymolybdenum-containing complex; d) from about 0.1 to 5 wt % of a friction modifier; and e) from about 0.2 to 10 wt % of an antioxidant selected from the group consisting of a diphenylamine type, a sulfurized ester-containing compound and mixtures thereof; wherein the total concentration of the oxymolybdenum-containing complex and antioxidant must be at least 1.3 wt %, based on the total weight of the lubricating oil composition and wherein the phosphorus content of the total lubricating oil composition is 0.08 wt % or less, based on the total weight of the lubricating oil composition.

The invention relates to a method for pre-vulcanizing a hydrogenation catalyst outside a hydrogenation reactor and activating the hydrogenation catalyst in the hydrogenation reactor. The method comprises the following steps of: (1) pre-vulcanizing the catalyst outside the hydrogenation reactor; (2) passivating the catalyst; and (3) reactivating the catalyst. A vulcanization method for the hydrogenation catalyst provided by the invention can guarantee high vulcanization rate of the catalyst; the passivated catalyst does not have abnormal odor and does not release hydrogen sulfide gas when being in contact with air or vapor; and the catalyst does not spontaneously combust and is not required to be protected by inert gas. Storage, transportation and filling methods and the like of the catalyst are simple and convenient. The catalyst can reach an activated state in a few hours during reactivation of an atmosphere containing a vulcanizing agent and hydrogen, is short in processing time, convenient to operate and has high catalytic performance.

The invention relates to a method for reducing concentrate magnesium oxide content in copper-nickel sulfide ore flotation. The method includes steps of firstly adding complexing agent oxalic acid, citric acid, tartaric acid, quadrol and EDTA (ethylene diamine tetraacetic acid), cleaning active ions of copper and nickel on the surface of magnesium-contained gangue mineral such as serpentine, removing flotation activity of sulfide ore collector such as xanthogenate, and adding composition agent to suppress gangue mineral. Ore pulp is treated by complexing agent, the flotation environment is improved, and floatability difference between copper-nickel sulfide mineral and magnesium-contained gangue mineral is increased. By combined inhibitor, serpentine and talc gangue mineral are suppressed, and magnesium-reducing effect is better; nickel recovery rate is increased to some extent as compared with that of actual production. Meanwhile, content of magnesium oxide in concentrate is reduced, and melting cost is lowered.

The invention relates to a heavy-metal-polluted site soil leaching remediation method and a heavy-metal-polluted site soil leaching remediation device. The method comprises the steps that: (1) soil pollutant types, densities, particle composition, pH value and organic matter content are detected; (2) the polluted soil is flushed by using water; a leaching agent is added, and the soil is leached; (3) separation is carried out by using a roller screen; on-screen substances are backfilled, and under-screen substances are subjected to fine separation; (4) under-screen substances are processed by using a hydrocyclone separation device; when obtained sand reaches a test standard, the sand can be backfilled; (5) alkali is added for regulating the pH value, and a heavy metal precipitating agent Na2S is added, such that heavy metal is converted into metal sulfide precipitate; (6) after the heavy metal precipitation reaction, a flocculant is added, such that coagulating sedimentation is carried out; after coagulating sedimentation, solid-liquid separation is carried out by using a plate-and-frame filter press; and (7) pH value of wastewater produced by solid-liquid separation is regulated by adding sulfuric acid, and is recycled in the leaching step. The method provided by the invention has the technical effects that: after heavy-metal-polluted soil is processed, heavy metal pollutants can be separated with physical separation (particle separation) and chemical extraction methods; and the leaching liquid (water) can be repeatedly utilized.

An electrode for an ignition device is made from a Ni-based nickel-chromium-iron alloy which has improved resistance to high temperature oxidation, sulfidation, corrosive wear, deformation and fracture includes, by weight of the alloy: 14.5-25% chromium; 7-22% iron; 0.2-0.5% manganese; 0.2-0.5% silicon; 0.1-2.5% aluminum; 0.05-0.15% titanium; 0.01-0.1% total of calcium and magnesium; 0.005-0.5% zirconium; 0.001-0.01% boron, and the balance substantially Ni. It may also include at least one rare earth element selected from the group consisting of: yttrium, hafnium, lanthanum, cerium and neodymium in amounts ranging from 0.01-0.15% by weight, and incidental impurities, including cobalt, niobium, molybdenum, copper, carbon, lead, phosphorus or sulfur. These total of these impurities will typically be controlled to limits of 0.1% cobalt, 0.05% niobium, 0.05% molybdenum, 0.01% copper, 0.01% carbon, 0.005% lead, 0.005% phosphorus and 0.005% sulfur. The ignition device may be a spark plug which includes a ceramic insulator, a conductive shell, a center electrode disposed in the ceramic insulator having a terminal end and a sparking end with a center electrode sparking surface, and a ground electrode operatively attached to said shell having a ground electrode sparking surface, the center electrode sparking surface and the ground electrode sparking surface defining a spark gap therebetween. At least one of the center electrode or the ground electrode includes the solution-strengthened Ni-based nickel-chromium-iron alloy. The Ni-based nickel-chromium-iron alloy electrodes of the invention may also include a core with thermal conductivity greater than that of the Ni-based nickel-chromium-iron alloy, such as copper or silver or their alloys.

A lubricant composition is disclosed that comprises: (a) a lubricant and (b) at least one molybdenum-containing compound in the form of surface-capped nanosized particles of the general formula: (Z)n(X—R)m wherein Z is an inorganic moiety comprising molybdenum and sulfur in the form of particles having dimensions in the range of from about 1 to about 100 nm; (X—R) is a surface-capping reagent wherein R is a C4 to C20 straight or branched-chain alkyl or alkylated cycloalkyl radical or radicals and X is a functional group capable of specific sorption and / or chemical interaction with molybdenum / sulfur moiety; n is the number of molecules of Z in the particles; m is an integer representing the amount of surface-capping reagents relative to a single particle; and the ratio of m to n is in the range of from about 1:1 to about 10:1.

The invention relates to synthesis of germanium sulphide glasses and optical devices formed therefrom. In a chemical vapour deposition process, germanium tetrachloride is reacted with hydrogen sulphide at temperatures in the range 450-700° C. to form germanium sulphide. Lower temperatures within this range of 450-550° C. directly produce a glass, whereas higher temperatures within the range of 600-700° C. produce a crystalline powder which can then be reduced to a glass by subsequent melting and annealing. The reaction is preferably carried out at atmospheric pressure or slightly higher. Thin films and bulk glasses suitable for optical waveguides can be formed directly in one processing step as can powders and microspheres. The materials synthesised are of a high purity with low oxide impurities and only trace levels of transition metal ions.

The invention belongs to the technical field of transition metal sulfide-carbon materials, and particularly discloses a cobalt-nickel sulfide / carbon nanofiber composite material and a preparation method and an application thereof. The method comprises the following preparation processes: preparing a carbon nanofiber through electrostatic spinning and high-temperature carbonization methods; and carrying out in-situ growth of a cobalt-nickel sulfide nanorod on the carbon nanofiber through a one-step hydrothermal method. The carbon nanofiber prepared by the method has the advantages of stable chemical property, good conductivity, good mechanical property and the like; the final cobalt-nickel sulfide / carbon nanofiber composite material is controllable in morphology; the cobalt-nickel sulfide nanorod uniformly grows on the carbon nanofiber; and a unique base structure and high specific surface area of the carbon nanofiber are fully utilized. The cobalt-nickel sulfide / carbon nanofiber composite material prepared by the method can be used as an ideal high-property electrocatalytic material, and an electrode material for new energy devices of a lithium-ion battery, a super capacitor and the like.

The present invention provides a chromium and active elements modified platinum aluminide coating that may be used on a surface of a gas turbine engine component such as a turbine blade. The coating may be used as a protective coating that impedes the progress of corrosion, oxidation, and sulfidation in superalloy materials that comprise the substrate of the turbine blade. Additionally, the coating may be used as a bond coat onto which a thermal barrier coating is deposited. The presence of active elements as well as chromium and platinum provides improved corrosion, oxidation, and sulfidation resistance. The coating is applied using an electron beam physical vapor deposition. The coating is applied alternatively using selected sequential diffusion processing steps involving chromium, platinum and aluminum.

The invention relates to a nickel disulfide carbon nano composite material and a preparation method and an application thereof, wherein the composite material is formed by coating a nickel disulfide nanosheet with a carbon layer. The preparation method comprises the following steps of preparing a nickel hydroxide nanosheet precursor by a hydrothermal method, performing magnetic stirring and dispersing in deionized water to obtain a uniform dispersion liquid of the nickel hydroxide nanosheet precursor, adding a buffering agent tris(hydroxymethyl) aminomethane hydrochloride, and adjusting the pHvalue to be 8.5 by adopting an alkali solution with the pH value of 13, adding dopamine hydrochloride, and magnetically stirring at room temperature for in-situ polymerization, and carrying out washing and centrifugally drying to obtain a nickel hydroxide nanosheet precursor / polydopamine composite material, and carrying out heat treatment and vulcanization with sublimed sulfur powder in a tubularfurnace in nitrogen atmosphere at a certain temperature to obtain the composite material. The preparation process is simple, easy to operate, green and non-toxic and friendly in material preparationprocess; and the prepared nickel disulfide carbon nano composite material is stable in structure, uniform in morphology and high in dispersion. The obtained nickel disulfide carbon nano composite material can be an ideal electrode material of a high-performance lithium ion battery, a supercapacitor and other new energy devices.

Methods for rejuvenation of supported metallic catalysts comprised of a Group VIII metal, a Group VIB metal, making use of these metals, an organic complexing agent, and optionally an organic additive, are provided. The rejuvenation includes stripping and regeneration of a spent or partially spent catalyst, followed by impregnation with metals and at least one organic compound. The impregnated, regenerated catalysts are dried, calcined, and sulfided. The catalysts are used for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.

The present invention provides a chromium and active elements modified platinum aluminide coating that may be used on a surface of a gas turbine engine component such as a turbine blade. The coating may be used as a protective coating that impedes the progress of corrosion, oxidation, and sulfidation in superalloy materials that comprise the substrate of the turbine blade. Additionally, the coating may be used as a bond coat onto which a thermal barrier coating is deposited. The presence of active elements as well as chromium and platinum provides improved corrosion, oxidation, and sulfidation resistance. The coating is applied using an electron beam physical vapor deposition. The coating is applied alternatively using selected sequential diffusion processing steps involving chromium, platinum and aluminum.

The invention provides a single-metal vulcanized hydrogenation catalyst and a double-metal vulcanized hydrogenation catalyst, and a preparation method and application thereof. The preparation method for the single-metal vulcanized hydrogenation catalyst comprises the following steps: (1) subjecting a dispersant and a solution A containing group-VIB metal salt and a sulfur source to contacting, wherein the solution A is acidic; the dispersant is a water-soluble organic solvent with a boiling point of 15 DEG to 90 DEG C; and the sulfur source is a sulfur-contained substance capable of hydrolyzing at 50 to 100 DEG C under the condition of acidity; (2) subjecting the product obtained by contacting in the step (1) and a catalyst carrier to contacting at 60 to 150 DEG C under a sealed condition for 5 to 30 hours; and (3) subjecting a solid material obtained by contacting in the step (2) to calcinating in an inert or reducing atmosphere. The invention also provides the single-metal vulcanized hydrogenation catalyst prepared by using the above-mentioned method, and application of the single-metal vulcanized hydrogenation catalyst in hydrodesulfurization and / or hydrodenitrification. Compared with the prior art, the hydrogenation catalyst provided by the invention has the characteristics of high metal activation grade, high active metal dispersity, high activity, etc.

The invention discloses a technology of enhanced-dispersion partial selective and bulk flotation of lead and zinc sulfide ores under low and high alkalinity. During grading of the lead and zinc sulfide ores, sodium hexametahposphate is taken as a dispersion agent and directly added into a ball mill, the ores are ground till the ores with the size of 0.074mm account for 67%-70%, lime is taken as an adjusting agent, zinc sulfate and sodium sulfite are taken as inhibitors, dithiophosphate BA and diethyldithiocarbamate are taken as collectors, and selective flotation of part of lead minerals with good floatability can be performed under low alkalinity; then xanthate and the diethyldithiocarbamate are taken as collectors, and the flotation of the lead minerals is further performed under high alkalinity; copper sulfate is added in lead flotation tailings for activation, butyl xanthate is further taken as the collector for flotation of zinc blende and part of pyrite, and zinc-sulfur separation flotation is further performed on zinc-sulfur mixed concentrate; and sulfuric acid is added in zinc flotation tailings for activation, and the xanthate is taken as the collector for flotation of the remaining pyrite. By adopting the technology, the lead-silver recovery rate can be improved, the using amount of lime and sulfuric acid can be reduced, the circulating amount of middlings can be reduced, the ore dressing cost can be reduced and the grade of the concentrate can be improved.

The invention discloses a preparation method of a tin sulfide material. A solvothermal method is adopted, dehydrate-stannous chloride is used as a tin source, the morphology and particle size of the synthetic material are controlled by controlling a sulfur source, the reaction temperature, reaction time, the solvent variety and the surfactant variety, and the SnS photocatalytic material with controllable morphology and high quality is prepared. The method is simple in preparation and easy to carry out, the yield is high, consumed time is short, cost is low, reaction conditions are mild, good development prospects are achieved, industrial production is easy to achieve, and the prepared material has high photocatalytic activity and has good industrial application prospects when serving as the photocatalytic material.

The invention discloses a preparation method of a sodium ion battery zinc sulfide based negative electrode material. A zinc based metal organic framework acts as a precursor of the negative electrode material, and is prepared by adopting a solvent heat vulcanization method, wherein zinc sulfide nano particles are dispersed into a porous carbon framework via in-situ assembly, and the mass percentage content of zinc sulfide is 70-90%. The material as the negative electrode material of the sodium ion battery shows the characteristics of high specific capacity and good cycling stability, and the preparation method is simple and easy to operate, is environmentally friendly, and is low in cost.