50results about How to "Improve the efficiency of the reduction reaction" patented technology

The invention relates to a preparation method of TiB2 ceramic powder. The preparation method comprises the steps: preparing materials according to the mass ratio of a reductant to a titanium source toa boron source to an alkali metal compound-containing molten salt of 1.0:(0.7-1.2):(0.7-4.0):(0.2-20.0), mixing evenly, carrying out heat treatment for 0.5-8 h under conditions of a protective atmosphere and the temperature of 600-1300 DEG C, dissolving in water or an alkali solution under a condition of room temperature-250 DEG C, washing, and drying, to prepare the TiB2 ceramic powder. The reductant is one or more of silicon powder and aluminum powder; the titanium source is one or more of Ti powder and TiO2 powder; the boron source is one or more of boron oxide, boric acid, sodium tetraborate, potassium tetraborate and lithium tetraborate; the alkali metal compound-containing molten salt is one or more of sodium hydroxide, sodium silicate, sodium carbonate, potassium hydroxide, potassium silicate, potassium carbonate, lithium hydroxide, lithium silicate, lithium carbonate and sodium aluminate. The preparation method has the advantages of low production cost, environmental friendliness and easy industrialized production, and the prepared product has small particle size and narrow particle size distribution.

The invention discloses a garbage disposal device capable of utilizing self-circulation pyrolysis gas for preheating air. The device comprises a feeding opening, a garbage pyrolysis furnace wall, a first horizontal heat conduction plate, a vertical heat conduction plate, a first smoke circular pipeline, a top smoke circular pipeline connection opening, a tail gas pipeline connection opening, a second horizontal heat conduction plate, a second smoke circular pipeline, a first induced draft fan, an air preheating cavity connection opening, a first air inlet, a garbage pyrolysis furnace, an air preheating cavity, an exhaust opening, a horizontal air distribution pipeline, a tail gas treatment pipeline, a bottom smoke circular pipeline connection opening, a second induced draft fan, an observation window, a vertical air distribution pipeline, a settling pond, a tail gas purification device, an air distribution system, a smoke circular system and other structures. According to the disposal device, the reduction reaction efficiency is improved, the garbage heat treatment efficiency is ensured; and meanwhile, the self-circulation pyrolysis gas can be used for preheating the air, it can be ensured that low-heat-value components such as aromatic alcohol and heavy oil can be sufficiently decomposed in the reaction, and pollutant emissions in the tail gas can be reduced.

The invention discloses a car tail gas purifying device, and belongs to the field of automotive exhaust emission reduction. The car tail gas purifying device comprises a purifying ejector, a purifying room and a purifying tank for providing purifying matter for the purifying room. The purifying tank communicates with an adsorption cavity of the purifying ejector. The input end of the purifying ejector is connected with an engine exhaust pipe. The output end of the purifying ejector is connected with a gas inlet channel of the purifying room. The interior of the purifying room is divided into a plurality of purifying chambers through separation plates. The purifying chambers communicate through inner cavity channels. Tail gas enters the purifying room through the gas inlet channel, and the tail gas is exhausted out of a gas outlet channel after circularly flowing in all the purifying chambers to be purified. The car tail gas purifying device has the beneficial effects that zero emission of harmful mater of tail gas is achieved, engine power is further improved, combustion efficiency and fuel economy are improved, and cost is low.

The invention discloses a method for removing acidic high-concentration mercury-containing waste water. The method includes the following steps that firstly, waste water containing divalent mercury is collected to a reaction vessel which is resistant to acid and alkali and good in ultraviolet permeability, sodium chloride is added into the waste water, a complexation reaction is performed under the stirring condition, fulvic acid is added after the complexation reaction ends, then the vessel is placed in a photo-chemical reaction device, a photo-chemical reduction reaction is performed under the stirring condition, the divalent mercury in the waste water is reduced into mercury protochloride to be recycled, and supernatant obtained after solid and liquid separation is treated effluent. The method solves the problem that the acidic high-concentration mercury-containing waste water pollutes the environment and has the advantages that the technology is simple, implementation is easy and the technology take effect fast, mercury in waste water can be economically and efficiently removed under the acidic condition, mercury in waste water can also be recycled, it is also possible that acid is recycled in the treated effluent, and economic benefits and environmental protection benefits are good.

The invention relates to an ammonia reducing agent storage device in an NH3-SCR system of a diesel powered car, belonging to the technical field of controlling the pollutant emission of diesel engine tail gas. The device is composed of an inner barrel and an outer barrel, a stainless steel mass transfer tube is arranged at the axle center of the inner barrel, an annular space between the stainless steel mass transfer tube and the inner barrel functions as an adsorbent bed for placing CaCl2 adsorption working medium and NH3 is adsorbed on CaCl2. After being hermetically connected with an inner barrel cover, the inner barrel is placed in an outer barrel. An annular space between the inner barrel and the outer barrel serves as the place where exhaust gas of the diesel engine heats the inner barrel, the exhaust gas enters the barrel from an air inlet at the bottom of the outer barrel to heat the inner barrel and then is discharged from an air outlet at the upper part of the outer barrel, and after adsorption stripping, NH3 is discharged from an air duct through the stainless steel mass transfer tube. The ammonia reducing agent storage device can directly provide NH3 reducing agent for the SCR system and solves the problem of low utilization rate of ammonia reducing agent; the storage device is simple in structure, safe and reliable; by adopting the exhaust gas of the diesel powered car as a heating source, energy can be saved; as the inner and outer barrels are convenient to dismantle, the service condition monitoring and replacement of adsorbents can be realized.

The invention discloses a motor vehicle exhaust purifying device, and belongs to the field of motor vehicle exhaust emission reduction. The motor vehicle exhaust purifying device comprises a purifying ejector, a purifying chamber and a purifying tank (27) for providing purifying matter for the purifying chamber. The purifying tank (27) is communicated with an adsorption cavity (2) of the purifying ejector, the input end of the purifying ejector is connected with an engine exhaust pipe, the output end of the purifying ejector is connected with a gas inlet channel (10) of the purifying chamber, the interior of the purifying chamber is divided by partition plates into a plurality of purifying cavities, the purifying cavities are communicated through inner cavity channels, and exhaust enters the purifying chamber through the gas inlet channel (10) and circularly flows in the purifying cavities to be purified to be emitted out through a gas outlet channel (11). The motor vehicle exhaust purifying device has the advantages that zero emission of exhaust harmful substance is achieved, the power of an engine is further improved, the combustion efficiency and the fuel economy are improved, and cost is low.

An embodiment of the invention relates to a metallofullerene nitroxide free radical derivative as well as a preparation method and an application thereof. The metallofullerene nitroxide free radical derivative in the embodiment can efficiently produce electron transfer under irradiation of visible light, so that a NO free radical turns into NO+ with certain catalytic oxidation activity, and efficient and high-selectivity catalytic conversion of alcohol compounds into aldehyde compounds is realized under the mild condition. Meanwhile, the metallofullerene nitroxide free radical derivative catalyst can replace functions of multiple reported catalysts in a catalyst system taking the nitroxide free radical as one of catalysts; besides, the dose of the metallofullerene nitroxide free radical derivative catalyst is basically 1/10 of that of NO free radical catalysts in the prior art, but similar or better effects can be realized.

The invention relates to a device and method for smelting metal through a thermal reduction method, and belongs to the technical field of metal smelting. The device and method for smelting the metal through the thermal reduction method are provided, and the device comprises a smelting furnace 1, a heating device 2, a mineral powder injection device 3, a reducing agent injection device 4, a slag former injection device 5, a metal discharging device 6 and a tail gas guiding device 7. The device can directly spray mineral powder and a reducing agent into a smelting furnace, heating is quickly conducted in the furnace to the reduction temperature, the reducing agent and the mineral powder are sufficiently contacted to produce reduction reaction, and reducing metal and slag fall into the bottom of the furnace to be layered and are discharged out of the furnace at regular time. When the device is used for smelting the metal by the thermal reduction method, the process energy consumption can be reduced, the contact area of the reducing agent and the mineral powder can be increased, the dynamic conditions of reduction reaction are greatly improved, the metal is quickly reduced, and the efficiency of the reduction reaction is improved.

The invention discloses a laterite gas base reduction apparatus which comprises a pelletizing device, a reduction device and a coke furnace raw gas generator, wherein the pelletizing device is used for pelletizing laterite-nickel ore, binding agent, reduction coal and regulator; the reduction device is connected with the pelletizing device, and a reduction reaction chamber is defined in the reduction device so as to receive pellets from the pelletizing device; and the coke furnace raw gas generator is connected with the reduction device, and used for introducing coke furnace raw gas into the reduction reaction chamber. The laterite-nickel ore smelting apparatus disclosed by the embodiment of the invention can effectively smelt laterite-nickel ore to obtain ferronickel alloy by utilizing the coke furnace raw gas.

The present invention discloses an electrode catalyst and a preparation process of the electrode catalyst. A composite electrode takes a foamed metal or alloy material, such as foamed titanium, foamed nickel and a foamed stainless steel sheet, etc., as an electrode substrate, an air diffusion layer is prepared at one side of the substrate after treatment, and the other side of the substrate is conductive. Flame smoke particles generated by the combustion of the fuels, such as paraffin, gasoline, diesel oil or kerosene mixed with organic metal chemicals, etc., are mixed on the conductive side surface by roasting, the catalytic layer is prepared at the conductive side of the electrode substrate, and the composite electrode with the catalytic layer firmly attached is prepared through the procedures of fuel dipping combustion and calcination on the surface of the catalytic layer. The prepared composite electrode has the advantages that the preparation process is simple, the electrode catalyst is uniformly loaded, no binder or current collector is needed, and the composite electrode has higher mechanical strength and conductivity and can be better applied in practice.

The invention relates to the technical field of diether type organic compounds, in particular to a preparation method of an alkyl-substituted diether type electron donor. The method comprises the following specific reaction steps: under the catalytic action of organic alkali, adding a compound b into a compound a, and carrying out an alkylation reaction of carbonyl alpha-carbon to obtain a compound c; carrying out ester reduction reaction on the compound c to obtain a compound d; and carrying out etherification reaction on the compound d and a compound e under the action of inorganic alkali to obtain a diether compound f. According to the invention, the alkyl diethyl malonate is adopted as a raw material and can be used for various alkyl-substituted diether electron donors, the intermediate treatment process is simple, other noble metal catalysts are not used, the product yield is high, the reaction route is short, and the preparation cost is low.