138results about How to "Low starting temperature" patented technology

The invention discloses a hydrofining catalyst and a preparation method thereof, belonging to the field of catalysts used in the petroleum-chemical industry. The hydrofining catalyst disclosed herein comprises a carrier, an active component and an auxiliary agent, wherein the carrier is Ti-modified gamma-alumina, the active component comprises oxides of Mo, Co and Ni, and the auxiliary agent comprises oxides of rare earth. The catalyst is characterized in that: based on 100% of the total weight of the catalyst, Co (measured in CaO) in the active component accounts for 2.0-7.5% of the total weight of the catalyst, Mo (measured in MoO3) in the active component accounts for 4.0-18.0% of the total weight of the catalyst, Ni (measured in NiO) in the active component accounts for 0.2-5.0% of the total weight of the catalyst, the auxiliary agent accounts for 0.05-1.0% of the total weight of the catalyst, and the balance consists of the carrier. According to the invention, the catalyst prepared by the formula and the method disclosed in the invention can carry out hydrogenation on saturated monoolefine while the catalyst is used for carrying out hydrodesulfurization on oils, can be suitable for technical requirements of heavy oriention, changeable sulphur content, and high air speed of hydrogenation liquid for pyrolysis gasoline two-stage hydrogenated raw materials, and simultaneously, the catalyst has the advantages of low activation temperature and low loss of aromatics in the hydrogenation process.

The invention discloses a catalyst for decomposing nitrous oxide and a preparation method of the catalyst. The catalyst is prepared by the deposition precipitation method. The method comprises the processes of preparing a deposit, washing, forming a deposit, activating through the catalyst, etc.; the catalyst comprises active ingredients, a carrier which is zirconium oxide, and additives, wherein the active ingredients include one or more than two of Co, Ni, Fe and Mn; the additives include one or more of cerium oxide, lanthanum oxide and barium oxide. A catalyst activity experiment shows that nitrous oxide can be completely catalytically decomposed into nitrogen and oxygen at the temperature ranging from 450 to 700 DEG C; therefore, the activation temperature is low, and the T50 (reaction temperature under conversion rate of 50%) is about 350 DEG C. The catalyst is high in activity and outstanding in heat resistance, has a wide operation window, and enables the concentration of nitrous oxide in industrial waste gas to be greatly reduced, and therefore, the environmental pollution is decreased; the catalyst is particularly suitable for N2O removal of a nitric plant and an adipic acid plant.

The invention discloses a catalyst for preparing 2-methyl furan through gas phase hydrogenation of furfural and a preparation method thereof. The catalyst consists of the following components in percentage by weight: 45 to 60 percent of copper oxide CuO, 30 to 40 percent of chromic oxide CR2O3, 1 to 10 percent of alumina Al2O3 and 1 to 5 percent of silicon oxide SiO2, and is prepared by a coprecipitation method. The catalyst has the characteristics of low activation temperature, long service life, and high selectivity of the 2-methyl furan, and can be used for industrial production of the 2-methyl furan through gas phase hydrogenation of the furfural.

A steel sheet used for hot stamping includes, by weight percent, 0.18˜0.42% of C, 4˜8.5% of Mn and 0.8˜3.0% of Si+Al with the balance being Fe and unavoidable impurities. The alloy elements of the steel sheet enable the actual measured value of the martensitic transformation start temperature after hot stamping to be ≦280° C. The method for manufacturing the component includes: heating the material to 700˜850° C. and then stamping; cooling it to the temperature that is 150˜260° C. below the martensitic transformation start temperature by cooling in a die, cooling by air, water, or other methods; heating the component to a temperature ranging from 160 to 450° C. and maintaining the temperature for 1 to 100000 seconds for heat treatment, and then cooling the component to room temperature. The formed component has a yield strength of ≧1200 MPa, a tensile strength of ≧1600 MPa and a total elongation of ≧10%.

The invention discloses a cerium supported medium temperature SCR (selective catalytic reduction) catalyst. Titanium zirconium oxide is taken as a supporter, and cerium oxide is taken as an active ingredient, wherein a ratio of cerium to titanium to zirconium in the catalyst is (0.1-0.3):1:1. The invention also discloses a preparation method of the cerium supported medium temperature SCR catalyst. Compared with a single titanium zirconium composite oxide catalyst, the cerium supported medium temperature SCR catalyst has the advantages that as CeO2 is taken as the active ingredient, a catalyst denitration reaction temperature is lowered, denitration efficiency and heat resistance are obviously improved, an SCR activity temperature window is expanded, and a good modification effect on a TiO2-ZrO2 catalyst is achieved.

The invention discloses a heat dissipation system which is used for increasing the efficiency of traditional heat conducting pipes, promoting the efficient utilization of space and reducing the temperature in starting the heat conducting pipe. The heat dissipation system comprises an evaporator, a steam channel, a condensing area and a condensate channel; wherein, one end of the steam channel is connected with the evaporator and the steam channel is used for conveying the steam from the evaporator; the other end of the condensate channel is connected with the condensing area which is used for condensing the stream into the condensate, and the condensate channel is connected with the condensing area and the evaporator and one of the condensing area and the evaporator is provided with a capillary structure; the condensate channel and the steam channel are connected with the condensing area by the evaporator; the condensate returns to the evaporator by the condensate channel and transforms into other steam by an outer heat source in the evaporator.

The invention relates to a low-temperature water gas conversion catalyst under hydrogen rich reformed gas and a preparation method thereof, and belongs to the technical field of water gas conversion processes and catalysts. The active ingredient in the catalyst is Cu, the carrier is monoclinic phase ZrO2, and the auxiliary agent is one or more of acidic oxide and rare earth oxide. During preparation, the carrier is prepared by using a hydrothermal method, and then the active ingredient is carried by using a co-precipitation method. Compared with other copper-based conversion catalysts, the catalyst prepared by the method has high water gas conversion catalysis activity, and particularly the low-temperature water gas conversion activity of the catalyst is remarkably improved. For example, the catalyst with 25 percent of CuO can achieve the CO conversion rate of 53 percent at the temperature of 150 DEG C, and the CO conversion rate at the reaction temperature of 200 to 300 DEG C is over 90 percent.

The invention discloses a vanadium-series loading type high-temperature SCR catalyst. The vanadium-series loading type high-temperature SCR catalyst takes a titanium tin oxide as a carrier, takes an oxide of vanadium as an active component and takes an oxide of cerium as a cocatalyst, wherein the mol ratio of cerium to titanium to tin in the catalyst is (0.1-0.3) to 1 to 1; and the mass of the oxide of vanadium accounts for 1% of the whole mass of the catalyst. The invention further discloses a preparation method of the catalyst. Compared with a single vanadium-based catalyst, the vanadium-series loading type high-temperature SCR catalyst has the advantages that CeO2 is added, so that the heat resistance of the catalyst is improved; the reduction temperature of the catalyst is reduced and the denitration efficiency is improved; a selective catalytic reduction denitration active temperature window is widened; and the modification effect on a V2O5/TiO2-SnO2 catalyst is very good.

The invention relates to a method for starting a proton exchange membrane fuel cell under a low-temperature state. A mixed gas is introduced to a positive electrode for catalytic pre-heating, a tail gas of the positive electrode is introduced to a negative electrode, so that the mixed gas which does not react generates catalytic reaction in the negative electrode, and the effect of simultaneouslyrising temperatures of the negative electrode and the positive electrode is achieved. The method is improved on the basis of a traditional catalytic cold-starting method, the negative electrode and the positive electrode can simultaneously generate catalytic reaction, heat is provided for the cell, low-temperature starting at -45 DEG C even a lower temperature range can be achieved, fuel can be fully utilized, the starting power consumption of the cell is reduced, and the low-temperature starting time is greatly reduced.

The invention discloses a waste heat recovery for condensing type anti-corrosive gas/oil-fired boiler, which can effectively recover the physical heat of boiler flue; not only lots of sensible heat is recovered, but also the latent heat of vaporization discharged by condensation of water vapor. The structure is as follows: a common heat tube heat exchanger body and a solution spraying device are included. The heat tube heat exchanger body is used for transferring the heat from the flue side to the other side by the shock transmission of the heat tube, so as to heat the air or water; the solution sprayed by the sprayer is uniformly distributed in the heat exchange tube on the flue side and on the inner wall of the heat exchanger, so as to remove the corrosion from the weakly acidic solution formed by condensation of water vapor in the flue of the boiler.

The invention provides a low temperature high activity carbon dioxide methanation catalyst and a preparation method thereof. CO(NH2)2 is used to replace NaOH and Na2CO3 to avoid the introduction of Na <+> ions. CO(NH2)2 slowly carries out hydrolysis at a temperature of 90 to 120 DEG C to generate OH<-> and CO2<-> for precipitation so that uniform precipitate [Ni<1-x><2+>Al<x><3+>(OH)<2>]<x+>(CO3)<x/2><2-> is generated. The precipitate is subjected to centrifugation, filtering, washing, drying, and burning to obtain a nickel-aluminum hydrotalcite catalyst precursor; and then potassium carbonate and calcium aluminate cement are added to carry out wet milling, kneading, flattening, and moulding to prepare a finished methanation catalyst. The preparation method has the advantages of simple technology, low cost, high catalyst strength, and long service life of catalyst. The methanation catalyst is activated at a temperature about 150 to 250 DEG C. When the temperature reaches 260 to 400 DEG C, the CO2 conversion rate can reach 90% or more, and the CH4 selectivity is close to 100%. The hydrothermal stability of the catalyst is good.

The invention discloses a method for preparing a synthetic natural gas low-ruthenium methanation catalyst, and belongs to the field of catalysts and fine chemical engineering. According to the method, gamma-type aluminum oxide is infiltrated by the solution of soluble titanium compounds, dried and roasted to obtain composite support TiO2/Al2o3, and is then impregnated in the solution of soluble ruthenium compounds in an equivalent-volume impregnation mode, the obtained impregnant is dried and roasted to obtain the synthetic natural gas low-ruthenium methanation catalyst, and the carrying capacity of Ru is 0.3-2.0% by weight. The prepared Ru/TiO2-Al2O3 catalyst gets a good result in a CO methanation reaction evaluation. The synthetic natural gas low-ruthenium methanation catalyst has big specific surface area, is high in catalytic activity,low in sensibility to poisons, good in stability, low in starting temperature, simple in preparation process, feasible economically and used for the inlet of a synthetic natural gas one-stage methanator, can reduce synthetic natural gas preheating temperature, and reduces heat energy consumption.

The invention relates to a device for starting a proton exchange membrane fuel cell at a temperature below zero degree, wherein a mixed gas is catalytically preheated at an anode, and tail gas of theanode is introduced into a cathode, so that an unreacted mixed gas is catalytically reacted at the cathode, and the effect of simultaneous heating of the cathode and the anode is realized. The invention is improved on the traditional catalytic cold start device, the cathode and the anode can simultaneously generate catalytic reaction and provide heat to the battery, which can realize low temperature start-up in the temperature range equal to -45 DEG C or below, fuel is fully utilized, the battery start-up power consumption is reduced and the low temperature start-up time is greatly reduced.

The invention provides a structure of a heat transfer element, i.e. thermal column and a manufacturing method thereof. Stamping or extrusion is utilized to prepare pure copper metal barrel and a base plate; the inner cavity of the thermal column is provided with various capillary structures, such as sintered copper powder, copper nets, grooves and the like; after being sintered, the capillary structures are assembled to cause capillary tissues in the cavity to be fully communicated, and the thermal column is obtained by welding, injection and vacuum degassing. The invention can effectively solve the problem of working medium backflow and blockade in the processes of liquid heat transfer medium evaporation and condensation phase change so as to greatly improve heat transfer performance; asthe heat radiation core element, the thermal column can satisfy the operating requirements on high heat dissipation power and light weight of computer microprocessors, large-power LED illumination and integrated circuit radiators.