124 results about "Methane combustion" patented technology

The present invention discloses a preparation method of methane combustion catalyst. The major preparation process includes: Sn powder is dissolved in nitric acid and added into citric acid solution for stirring and refluxing at the temperature of 90 DEG C to 100 DEG C; La(NO3)3 and Mn(NO3)2 are weighed and confected into metal-ion citric acid complexing solution; the complexing solution is added into the stannum-containing citric acid solution for further stirring and refluxing; the solution is transferred to a beaker for constant-temperature water bath at the temperature of 70 DEG C and evaporation so as to become wet gel and the wet gel is placed in an infrared drying box and dried into dry gel; after grinding, decomposition by a muffle furnace and sintering by a high-temperature furnace, LaMn0.8O3/La2Sn2O7 catalyst is obtained. The preparation method is simple and the prepared catalyst has the characteristics of novel structure, stability, low cost, low methane initiation temperature and low whole transformation temperature.

The present invention relates to a preparation method of titanium-containing double perovskite type methane combustion catalyst. The process is characterized in that a certain amount of butyl titanate is added into ethanol to produce white sediment; concentrated nitric acid is added until the sediment is totally dissolved and transparent solution is obtained; lanthanum nitrate and magnesium nitrate are weighed and dissolved in the deionized water and a certain amount of dextrose is added, thus completely forming composition solution; then gel is formed by constant-temperature stirring and evaporation; the gel obtained is dried and sintered at the temperature of 500 DEG C, 800 DEG C and 1,100 DEG C in the air for three hours to obtain the catalyst La2MgTiO6. The present invention is characterized in that the Sol-Gel Preparation Method with the dextrose as the complexing agent is adopted and the single-phase double layer perovskite type composite oxide catalyst is prepared at lower temperature. The preparation method is simple and low in cost. The catalyst used in methane catalytic combustion reaction has the characteristics of low initiation temperature and low whole transformation temperature.

The present invention provides metal-exchanged hexaaluminate catalysts that exhibit good catalytic activity and/or stability at high temperatures for extended periods with retention of activity as combustion catalysts, and more generally as oxidation catalysts, that make them eminently suitable for use in methane combustion, particularly for use in natural gas fired gas turbines. The hexaaluminate catalysts of this invention are of particular interest for methane combustion processes for minimization of the generation of undesired levels (less than about 10 ppm) of NOx species. Metal exchanged hexaaluminate oxidation catalysts are also useful for oxidation of volatile organic compounds (VOC), particularly hydrocarbons. Metal exchanged hexaaluminate oxidation catalysts are further useful for partial oxidation, particularly at high temperatures, of reduced species, particularly hydrocarbons (alkanes and alkenes).

The invention discloses a ventilation air methane combustion catalyst and a preparation method thereof. The catalyst consists of the following components in percentage by weight: 1 to 50 percent of active ingredient, 1 to 30 percent of active aid and the balance of porous carrier, wherein the active ingredient is one or two of oxides of manganese and cobalt or soluble salts of manganese and cobalt; the active aid is any one of cerium compounds or lanthanum compounds; and the porous carrier is one or more of aluminium oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, silicon dioxide, aluminium silicate and magnesium silicate. The catalyst is applied to ventilation air methane combustion and has the advantages of simple preparation method, low cost, relatively low methane ignition point and complete combustion temperature, and the like.

The invention provides a catalyst for catalyzing methane combustion and a preparation method thereof. The catalyst comprises a carrier, and an active component which is loaded on the carrier, wherein the active component is wrapped with a wrapping layer for providing oxygen vacancy. The catalyst further comprises a catalyst promotor which is a ceria-zirconia solid solution. According to the catalyst, the wrapping layer wraps the active component, so that oxygen molecule stored in the wrapping layer can be timely conveyed to the active component, so that the high-temperature stability of the active component of the catalyst is maintained; in addition, the catalyst further comprises the catalyst promotor which is the ceria-zirconia solid solution capable of generating more oxygen vacancies and timely effectively storing and discharging oxygen, so that the high-temperature stability of the active component of the catalyst is improved; in addition, the wrapping layer, the ceria-zirconia solid solution and the carrier are mutually dispersed and in contact, so that the mutual insulation effect is achieved, and the sintering of the carrier is inhibited, and as a result, the high-temperature thermal stability and the catalyzing activity of the catalyst can be improved.

The invention discloses a device for improving N2O production in sewage treatment and a control method thereof. The device comprises a raw water tank, a water inlet pump, a short-cut nitrification liquid tank, a short-cut nitrification liquid inlet pump, an N2O production reactor and an air compressor. The N2O production reactor is a sealed SBR reactor. The N2O production reactor comprises a sealing cover, a water seal device, an agent filling inlet, an N2O collection pipe, a stirrer, an aeration gas pipe, an aeration head, a DO probe and a pH probe. The control method comprises that a sludge inner carbon source is used as a denitrification carbon source and nitrite inhibits the activity of an N2O reductase so that N2O accumulation is realized; and through aeration, N2O in the mixed liquid is blown into a gas phase and then is collected and the collected N2O can be used as an oxidizing agent for methane combustion so that production power is improved. The control method can improve production power of a sewage treatment plant, reduce an N2O release amount, reduce a sludge yield and reduce a denitrification carbon source demanded amount.

The invention provides a nano-composite catalyst and a preparation method thereof, belongs to the technical field of catalyzing, and solves the problem that the conventional load nano-composite oxide catalyst is low in nano-composite degree, and poor in catalyzing performance. The nano-composite catalyst is obtained by the flowing steps based on the condition that a surface-active agent is not used: firstly, reducing composite oxide crystal lattices or first metal ions mixed in the crystal lattices so as to obtain nano-metal granules containing first metal; and then introducing second metal into the surface of the first metal by Galvanic substitution reaction so as to obtain the nano-composite catalyst. Compared with the conventional catalyst, the nano-composite catalyst has more efficient catalyzing performance when being used for catalytic reaction of VOC (volatile organic compound) removal, automobile tail gas purification, formaldehyde removal, methane combustion, hydrogenation, hydrogenolysis, ammonia synthesis, ammonia decomposition, hydrocarbon synthesis, hydroformylation and the like.

The invention relates to a supported-palladium catalyst used for methane combustion and a preparation method for the supported-palladium-loaded catalyst. The catalyst is characterized in that an active ingredient is noble metal palladium, an auxiliary is a rear-earth oxide, an alkali metal oxide or an alkali metal oxide and a carrier is tin oxide, wherein the content of the palladium accounts for 0.1-5 percent of the catalyst; the content of the rear-earth oxide is 3-10 percent; and the content of the alkali metal or alkali metal oxide is 0.01-2 percent. The supported-palladium catalyst disclosed by the invention can be used for catalytic combustion of ultralow-concentration methane, and has the characteristics of high activity and strong stability.

The invention relates to a tourmalinite-containing composite methane catalyst. The composite methane catalyst is prepared by compounding of a methane catalyst and tourmalinite, and the mass ratio of tourmalinite to the methane catalyst is 1:50-3:10. The methane catalyst contains a perovskite type methane catalyst, a hexaaluminate type methane catalyst or a metal oxide methane catalyst. According to the invention, the refined mineral material tourmalinite is used in the methane catalyst such that methane gas can be effectively and greatly activated, combustion efficiency and methane combustion rate are raised, production cost is low and the preparation technology is simple. The rare earth tourmalinite composite methane catalysis material provided by the invention can be widely applied in fields of catalytic combustion, industrial organic exhaust-gas treatment, automobile tail gas purification and the like, is of important and active significance for energy saving and emission reduction and reasonable usage of energy, and can bring to the nation with good economic benefit and social benefit.

The invention discloses a spherical catalyst with Pd wrapped by cerium dioxide and a preparation method thereof. The preparation method comprises the steps: firstly, preparing a precursor solution A of cerium salt and palladium salt, and then carrying out a reaction of the precursor solution A in a hydrothermal reaction kettle to produce a product B; and carrying out centrifugal washing, drying and calcination of the product B, to obtain the spherical catalyst with Pd wrapped by cerium dioxide. The synthesis method is simple, and the obtained catalyst has high Pd metal dispersion degree and catalytic oxidation performance. Under the conditions of the gas composition of 2% of CH4, 4% of O2 and 20% of CO2, N2 balance and the space velocity of 100000 mL*g<-1>*h<-1> and at the reaction temperature of 470 DEG C, the methane conversion rate of the catalyst can reach 90%, and the structure of the catalyst has no obvious change after thermal aging for 2 h at the temperature of 1000 DEG C, theactivity of the catalyst is kept 99% or more in a 50 h stability test carried out at the temperature of 500 DEG C in the same atmosphere, and the catalyst has excellent methane combustion catalytic activity and stability.

The invention relates to a high temperature resistant catalyst for low concentration methane combustion and preparation method thereof. The catalyst is catalyst based on core shell structure of perovskite encapsulated yttrium stabilized zirconium nano particle. Mass percentage of perovskite is 10-30% and that of yttrium stabilized zirconium is 70-90%. The catalyst is used for methane catalytic combustion and able to completely catalytically combust methane at 380-545 degrees centigrade when methane content is 0.5% and space velocity is 24000h-1. The advantages of the invention are low catalyst cost, good thermal stability, simple preparation method, easy industrialization, small pollution, low methane ignition temperature and complete combustion temperature.

The invention relates to a gas kitchen range controller, which comprises a power resource; a flame detecting unit, a valve control unit for controlling the gas supply; a logic control circuit, at least one group of liquid crystal panels on the control panel to display the setting and working condition; a control panel with several operation buttons and switches as the input interface to said logic control circuit, a clock part, a timing part, a timing controller to timing control said valve control unit to block the gas supply channel, a flame signal processing unit for analyzing the detected signal of said flame detecting unit, that when the flame is normal, keeping the gas supply channel open via said valve controller, and when the flame is abnormal, blocking the gas supply channel via said valve controller.

The invention provides an Mn and Ce doped Cu based methane combustion catalyst, which comprises, by mass percentage, 3% of Mn, 5% of Ce, 10% of Cu and the balance carrier gamma-Al2O3. The catalyst is prepared by step impregnation, and the preparation method includes: firstly dipping globular gamma-Al2O3 into a certain amount of manganese nitrate solution according to a load ratio order from small to large, then taking the globular gamma-Al2O3 out and conducting standing, drying, roasting and natural cooling, then dipping the globular gamma-Al2O3 into a certain amount of a cerium nitrate solution, then taking the globular gamma-Al2O3 out, and carrying out standing, drying, roasting and natural cooling to obtain an intermediate catalyst; and then dipping the intermediate catalyst into a certain amount of a copper nitrate aqueous solution, then taking the intermediate catalyst out, and carrying out standing, drying, roasting and natural cooling to obtain the Mn and Ce doped Cu based methane combustion catalyst. The methane catalyst is easily prepared, adopts non-noble metals as the raw materials, and is low in cost. In addition, the catalyst provided by the invention not only lowers the ignition temperature of methane catalysis, also enhances the high-temperature catalytic activity, and improves the whole methane catalytic activity.

The invention discloses a cobaltosic oxide in-situ coated silicon dioxide mesoporous sphere surface loaded noble metal catalyst, and a preparation method and an application thereof. A large number ofcoordination sites are provided for Pd atoms by utilizing the nitrogen-rich characteristic in mesoporous spheres, so the interaction force between a carrier and Pd NPs is enhanced, the stability of the Pd NPs is improved, and the conversion from PdO to Pd is relieved; and dopamine is introduced in the Pd loading process, so that a loose polydopamine layer is converted into a carbon shell in situ under the nitrogen condition, the surface of the catalyst is covered with the carbon shell, and the advantage of a shell structure is constructed. The method can inhibit the growth of Pd nanoparticlesand Co nanoparticles, enhances the dispersity and the sintering resistance and agglomeration resistance of noble metals, and effectively saves the preparation cost of the catalyst. The conversion rateof methane combustion of the prepared catalyst is close to 95% at a temperature being as low as 280 DEG C, the catalyst has H2O and CO2 resisting capacity, and energy is effectively saved.

The invention relates to a cobalt-based catalyst and a preparation method and application thereof. The cobalt-based catalyst is a mesoporous material formed by nanocrystallines, the specific area of the mesoporous material is 23.38-172.28 m<2>/g, and the grain size is 4.5-15.5 nanometers. The cobalt-based catalyst comprises a mixture of one or more oxides of ferrite, cobaltosic oxide, nickel oxide and manganese oxide, wherein the atomic ratio of cobalt to iron to nickel is 1:(0.060-0.10):(0-2.16), or the atomic ratio of cobalt to iron to manganese is 1:0.28:2.97, or the atomic ratio of cobalt to nickel is 1:(0.23-3.65). The cobalt-based catalyst disclosed by the invention can be used for effectively reducing the methane initiation temperature and enhancing the methane combustion rate by using a transition metal composite oxide obtained through a low-temperature oxidation reduction-concentration crystallization or oxalate co-precipitation-heat treatment process for a methane catalyst, and has the advantages of low cost, simple preparation process and easiness for popularization; a synthesized substance has the characteristics of high specific area, adjustability in size, composition and texture and the like, and is an excellent low-temperature methane catalysis material.

The invention discloses a method for generating and utilizing N2O in a partial nitrifying process of a sludge digestion solution. A device used by the method comprises a sludge nitrifying solution tank, a water inlet pump, a partial nitrifying N2O producing reactor, and the like, wherein the partial nitrifying N2O producing reactor is a sealed SBR (Sequencing Batch Reactor), and is provided with a sealing cover, an N2O collecting pipe, an exposure head, a DO (Dissolved Oxygen) probe and a pH probe. The method comprises the steps: regulating and controlling operating conditions through inoculating partial nitrifying particular sludge to enhance accumulation of N2O in the partial nitrifying process of the sludge digestion solution; then collecting a gas at the upper of the reactor as an oxidant of methane combustion, so that the yield is increased. According to the method, the release amount of N2O in the partial nitrifying process of the sludge digestion solution can be reduced, and the yield of a sewage plant can be increased.

The invention relates to a distributive energy supply compressed gas energy storage system. According to the system, in the energy storage stage, surplus electric power is utilized for finishing water electrolysis, methane preparing, carbon dioxide, methane and air compressing and underground storing, and thermal storage in the air compressing process. In the energy releasing stage, an underground gas storage system provides sufficient methane, carbon dioxide and air, an electrolysis water system and a methane preparing system provide a high-temperature heat source for a carbon dioxide energy releasing system and an air energy releasing system, and it is guaranteed that the carbon dioxide energy releasing system and the air energy releasing system can provide sufficient electric energy. Heat generated in the air compressing process and methane combustion heat are used for heat supplying, and heat of different grades can be provided according to the heat grade differences of users. Air expanded through the air energy releasing system provides the cooling capacity for the users.

The invention discloses a plasma-assisted method for preparing a perovskite type methane combustion catalyst, which comprises the following steps: adding a complexing agent into a soluble metal salt solution containing A-site elements and B-site elements to form a mixed solution containing a metal complex, evaporating the mixed solution to obtain wet gel, and drying and pretreating the wet gel toobtain a precursor; then putting the precursor into a glow discharge plasma generating device, and carrying out plasma treatment in an oxygen atmosphere to obtain the perovskite type methane combustion catalyst. According to the preparation method disclosed by the invention, lattice distortion of a perovskite structure is induced by utilizing the characteristic that high-energy particles generatedby gas discharge in glow discharge plasmas have active chemical properties; compared with a perovskite type catalyst prepared by traditional roasting or without plasma action, the catalyst has the advantages of more defect sites, lower grain size, larger specific surface area and the like, shows better activity in a methane combustion reaction, and reduces the temperature of the methane combustion reaction.

The invention discloses an agricultural multifunctional automatic control room, which comprises a shed body and a methane combustion furnace, wherein a double-layer ventilating shading room roof is arranged on the top of the shed body; a light steel frame is arranged inside the shed body; a cultivation cage is arranged on the upper part of the light steel frame, and a planting pond is arranged on the lower part of the light steel frame; the cultivation cage and the planting pond are provided with a moving device; a methane generating pond is arranged between the cultivation cage and the planting pond; the methane generating pond is connected with a methane generator set; the methane generator set is connected with a water pump; an organic transparent hollow outer shield capable of being opened and closed; and a mesh plate is arranged inside the organic transparent hollow outer shield capable of being opened and closed. The agricultural multifunctional automatic control room is simple in temperature regulating facilities, convenient to operate, abundant in interior crops or varieties of cultivated objects, low in production cost and high in space utilization rate; and the interior crops or the cultivated objects can utilize external natural environment fully on the basis of ensuring health and environment friendliness.

The invention discloses an ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst which adopts gamma-Al2O3-MgO as a carrier, wherein the surface of the carrier is loaded with an active ingredient CuO; in the active ingredient CuO, Cu accounts for 5%-10% of the catalyst in mass; compared with the catalyst prepared through adopting a common dipping method, the ultralow-concentration methane combustion catalyst has the following differences: an ultrasonic technology is led in in the loading process of the active ingredient with the ultrasonic wave frequency being 90-300 W, frequency being 20-25 KHZ, and time being 10-30 min, which can achieve an optimum effect; meanwhile, the invention further discloses a preparation method for the ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst. By utilizing energy of ultrasonic waves, the active ingredient CuO is modified and optimized in the structure and functions. The ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst and the preparation method thereof have the following advantages: the preparation technology for the catalyst is simple, the preparation period is short, and when the catalyst subjected to ultrasonic modification is used for catalytic combustion of ultralow-concentration methane, catalytic activity and stability of the catalyst can be effectively improved.

The invention discloses a protruding-ribbed roller type straw treatment device with tail heat recovery and biomass fuel. The protruding-ribbed roller type straw treatment device comprises a protruding-ribbed roller, a methane fermenting tank, a methane storage tank, a counter current drying tower, a methane combustion machine, a methane boiler, a heat pump host and a computer, wherein a sine ultrasonic vibration exciter is arranged on the left lower part of the methane fermenting tank, the right upper part of the methane fermenting tank is connected with a tank bottom through a pipeline and aroots fan, the roots fan is connected with the methane storage tank, the methane storage tank is connected with the methane boiler through a pipeline and the methane combustion machine, the methane boiler is connected with the counter current drying tower through a steam fin hot air fan, the left upper part of the counter current drying tower is sequentially connected with a spiral closed air feeder, a protruding roller and a dissection machine, a tail gas pipe is connected with a heat pump system, a cosine lacquer disk pulsed aeration device is arranged on the left lower part of the counter current drying tower, and the treatment device is controlled by the computer. The protruding ribbed roller, the cosine lacquer disk pulsed aeration device and the sine ultrasonic vibration exciter canreliably realize comprehensive development and utilization on crop straws and wastes with particularly large moisture content gradient.

The invention discloses a preparation method of an aluminum oxide film-layer carrier of an integrated methane combustion catalyst. The preparation method comprises the following steps: soaking a honeycomb-shaped carrier into aluminum sol; taking out the honeycomb-shaped carrier and removing the surplus aluminum sol on the surface; drying and roasting at the temperature of 800 DEG C to 1200 DEG C to form an aluminum oxide film layer which at least has any one crystal phase of beta-phase, theta-phase and alpha-crystal phase on the honeycomb-shaped carrier. The integrated methane combustion catalyst is prepared from the aluminum oxide film-layer carrier and an active component. The integrated methane combustion catalyst prepared by the invention has a high catalytic performance and a long service life.

The invention provides a methane combustion catalyst and a preparation method and application thereof, the methane combustion catalyst comprises an active component Pd and an Al2O3 carrier, and the Al2O3 carrier comprises 0-30 wt.% of SiO2; the content of the active component Pd in the methane combustion catalyst accounts for 0.1 to 2 weight percent. The preparation method comprises the following steps: dipping the Al2O3 carrier in a palladium-containing solution, carrying out rotary evaporation after dipping to obtain a solid product, and drying and roasting the solid product to obtain the methane combustion catalyst. The methane combustion catalyst provided by the invention has the advantages of low noble metal content, low catalyst cost, better hydrothermal stability and low-temperature activity, simple preparation method and easiness in industrial large-scale production.