125results about How to "Guaranteed catalytic effect" patented technology

The invention discloses a flue-gas denitration catalyst incapable of being deactivated by basic metallic oxides, a preparation method thereof and applications thereof. The catalyst comprises following components by weight: 70-85% of nanometer titanium dioxide, 1-3% of V2O5, 5-15% of heteropoly acid, 3-15% of glass fiber and 4-10% of an inorganic binder. In the preparation method, active components and the heteropoly acid are loaded step by step. The catalyst has high denitration performance and high performance of resistance to deactivation by the basic metallic oxides, and is particularly suitable for flue gas denitration of a power plant, an industrial boiler, an incinerator, a cement kiln, and the like, wherein the power plant, the industrial boiler, the incinerator, the cement kiln, and the like adopt biomass as fuel and contain a large amount of basic metallic oxides in flue gas.

The invention relates to a preparation method of a catalyst, in particular to a preparation method of a load-type metallic oxide ozone catalytic oxidation catalyst, which is characterized by comprising the following steps of (1) selecting ceramic filter bulbs to serve as a carrier, washing through deionized water, soaking for 24h by using diluted hydrochloric acid, and washing through the deionized water to effluent neuter for stoving; (2) dipping for 24h in nickel nitrate solution with the concentration of 0.1-1.0mol / L and drying; (3) roasting for 5h in a muffle furnace at 500 DEG C to obtain roasting objects; and (4) washing through the deionized water and stoving to obtain the load-type metallic oxide ozone catalytic oxidation catalyst. The preparation method is simple, low in cost, capable of greatly improving oxidation rate and efficiency of ozone on organic pollutant, good in product stability and capable of repeatedly using, and having important significant on application and dissemination of catalytic ozonation techniques.

The invention discloses a copper-based molecular sieve catalyst, as well as a preparation method and application of the copper-based molecular sieve catalyst for purifying catalyst oxynitride in a post-treatment Urea-SCR system on a diesel vehicle. The preparation method comprises the following steps: firstly performing ultrasonic impregnating and then performing freeze-drying treatment, so that the catalytic activity and the hydrothermal stability of the copper-based molecular sieve catalyst are effectively improved.

The invention discloses an ammoximation reaction and separation coupling process which comprises the following steps: continuously adding reaction raw materials and a solvent in different groups outside a reaction kettle into a pipeline reactor for reaction, mixing the components in a mixer, and subsequently feeding the mixture into the reaction kettle for sufficient reaction, wherein the upper part of the reaction kettle is a reaction zone, and the lower part of the reaction kettle is a filtration separation zone; separating a reaction product, namely, cyclohexanone-oxime from a catalyst in the filtration separation zone, feeding the separated cyclohexanone-oxime into a later process, and circulating the catalyst back to the reaction kettle for continuous reaction through equipment such as the pipeline reactor outside the reaction kettle. Backwashing is performed once every 10-300 seconds, so that the continuity of reaction separation is ensured. As the raw materials sufficiently contact the catalyst, the reaction is complete, and the conversion rate of cyclohexanone can be 99.9-100%. The whole set of reaction separation devices is reasonable in arrangement and stable in reaction.

The invention relates to a double dielectric barrier discharge device with a catalytic coating for waste gas treatment. The double dielectric barrier discharge device comprises a shell; a gas inlet and a gas outlet are formed in the two ends of the shell; a plurality of clamping grooves are formed in the side surface of the shell and are used for allowing plate electrodes and catalytic medium plates to be put in. The double dielectric barrier discharge device provided by the invention has the structure characteristic of plasma-catalytic module integration, is used for waste gas treatment and can not only realize plasma-catalytic efficient synergistic removal of volatile organic compounds, nitrogen oxides and other gaseous pollutants, but also realize the deep oxidation of the pollutants through catalyst formula adjustment aiming at different waste gas components; relative to a two-stage type plasma catalytic device, catalyst modules are reduced, the space is saved, and the pollutant removal efficiency is improved; relative to a traditional one-stage type plasma catalytic device, the caused airflow pressure drop is less, and the energy utilization efficiency is higher; when volatile organic waste gas is treated, the appearance of sediments on the inner wall of a discharge reactor can be effectively inhibited.

The invention discloses a method for preparing an anode of a solid oxide fuel cell by using an immersion method, belongs to the method for preparing the anode of a fuel cell, and solves the problem of easiness in performance weakening caused by low stability and easiness in aging of the conventional anode, which is prepared by using the immersion method, of the solid oxide fuel cell. The method comprises the following steps of: 1, preparing immersion liquid; 2, adding the immersion liquid into a porous anode supporting body, and roasting; 3, repeating the step 2, and sintering in an air atmosphere; and 4, restoring, and thus obtaining the anode of the solid oxide fuel cell. The method has the advantages that: selectable raw material sources are wide; a preparation process is simple; expensive experimental instruments are not required; large-scale application can be realized; the stability of the anode, which is prepared by using the immersion method with a dispersing agent, of the solid oxide fuel cell is improved; the electric conductivity and catalytic performance of the anode can be improved; porosity can be guaranteed by immersion of the porous anode supporting body; and fuel gas can smoothly reach the anode and an electrolyte interface for reaction, and generated water is drained.

The invention relates to a composite catalyst of an air electrode of a lithium-air cell. The composite catalyst comprises a metal catalyst, and a support for performing synergic catalysis with the metal catalyst. The metal catalyst is uniformly distributed on the surface of the support via in-situ loading. The metal catalyst accounts for 0.01 wt%-99.9 wt% of the composite catalyst, preferably 0.1 wt%-60 wt%, and more preferably 0.5 wt%-5 wt%. By utilizing the metal catalyst and the support with synergic effect on the metal catalyst, the composite catalyst of the air electrode is formed, the dispersibility and the stability of the original metal catalyst are improved, and also the catalytic activity not owned or unreached by the single metal catalyst is induced to generate.

The invention relates to a composite membrane counter electrode used for dye-sensitized solar cells (DSSC) and a preparation method thereof, solving the problem that platinum counter electrodes of the existing DSSC have high preparation cost. The composite membrane counter electrode of the invention comprises a conductive substrate, a carbon material membrane and a polypyrrole membrane. The preparation method of the invention comprises the following steps: first preparing electrophoretic liquid of the carbon material and then electrophoretically depositing the carbon material membrane on the conductive substrate; preparing electrodeposition liquid of pyrrole and depositing the polypyrrole membrane on the carbon material membrane by cyclic voltammetry to obtain the carbon material / polypyrrole composite membrane counter electrode. The composite membrane counter electrode of the invention has good catalytic performance, good electrochemical stability, high conductivity and low preparation cost. The photoelectric conversion efficiency of the DSSC based on the composite membrane counter electrode of the invention reaches 4.267%, which is equivalent to that of the existing DSSC based on the Pt counter electrodes.

Belonging to the technical field of low temperature SCR denitration, the invention discloses an active carbon loaded iron-based low temperature SCR denitration catalyst, a preparation method and application method thereof. The preparation method includes: taking grinded activated carbon as the carrier, using an Fe oxide as the main active component, adding trace Mn or Co as the active assistant respectively, loading the active component on the carrier by impregnation method, then conducting magnetic stirring and drying treatment, and finally performing roasting in air atmosphere, thus obtaining the low temperature SCR denitration catalyst. The low temperature SCR denitration catalyst provided by the invention has the characteristics of convenient production, simple use, and good denitration effect at low temperature, can well solve the problems of low denitration efficiency and slightly high use temperature section in existing denitration catalysts, thus being conducive to prolonging the service life of the catalyst, and saving cost.

The invention relates to imidazolium bromide ionic liquid containing amine groups and a preparation method and application of the ionic liquid. The structural formula of the imidazolium bromide ionic liquid containing amine groups is shown as the formula (I). Under protection of nitrogen, 3-bromopropylamine hydrobromide or 2-bromoethylamine hydrobromide and imidazole are dissolved in anhydrous ethanol after being mixed, reflux reaction is conducted for 20-25 h at 85-95 DEG C, ethanol is removed through vacuum distillation, an organic solvent is added, stirring and filtering are conducted, the organic solvent is removed from filter liquid through vacuum distillation, a KOH aqueous solution is added after vacuum drying so that the pH of the solution can be 8-9, filtering is conducted, solid is added into anhydrous ethanol and stirred, filtering is conducted again, filter liquid is dried in a vacuum mode, and the target product is obtained. In the process that catalytic epoxidation compound is used for synthesizing cyclic carbonate, the ionic liquid has the advantages that the yield is high, activity is high, no catalysts or solvents are needed, reaction conditions are mild, stability is high, and recycling is conducted many times. Please see the formula (I) in the description.

The invention belongs to the technical field of visible photocatalytic asymmetric organic synthesis, and provides organic catalysts having a visible photocatalytic asymmetric hydroxylation photocatalysis performance, and a preparation method and an application thereof. The catalysts are organic catalysts having a visible photocatalytic asymmetric hydroxylation performance, constructed through combining an asymmetric organic catalyst with a visible photosensitizer through chemical bonds. The catalysts successfully realize the formation of an asymmetric C-O bond through catalytic activation of aC-H bond with molecular oxygen as an oxidizer. The invention especially relates to a most concise method for catalyzing the asymmetric alpha-hydroxylation reaction of a beta-dicarbonyl compound to prepare an alpha-chiral hydroxyl-beta-dicarbonyl compound. The method has the advantages of mild reaction conditions, good substrate applicability and environmental protection. The catalysts have the advantages of extreme easiness in separation from the substrate, stable performances, realization of keeping the catalysis effect after multi-time cycle use, and good application and development values.

The invention relates to a cyclic application method of a Pd / mpg-C3N4 catalyst in an HBIW hydrogenolysis reaction, and belongs to the technical field of noble metal catalysis. According to the preparation method, common palladium metal is loaded on a novel carrier mpg-C3N4; the metal palladium in the catalyst has relatively high dispersity and stability; the catalyst has a graphite phase mesoporous structure and unsaturated -NH and -NH2 groups, so that the adsorbability of the catalyst to the HBIW is improved; the transmission efficiency of the HBIW in the catalyst is improved. According to the method disclosed by the invention, high-efficiency hydrogenation of HBIW under a low-pressure condition is realized and the catalyst can be recycled, so that the problem that the catalyst is inactivated after being used in HBIW hydrogenolysis in the industry at present is solved, the production cost of CL-20 is greatly reduced, and the method has a very high application prospect.

A petrochemical wastewater advanced treatment method includes the following steps: a, discharging secondary treatment effluent of petrochemical wastewater into a sewage pool, ascending the effluent into a coagulation sedimentation tank by a water inlet pump, at the same time, adding a flocculant PAC and a flocculant PAM to the coagulation reaction pool, determining the PAC adding quantity to be 10-30 mg / L and the PAM adding quantity to be 0.2-0.8 mg / L according to water quality conditions of the petrochemical wastewater, after sedimentation, allowing the effluent to enter a primary filter, filtering to remove residual suspended solids, and allowing the effluent after filtration to flow into a middle water pool; b, sending the wastewater in the middle water pool to a catalytic oxidation reactor by a lifting pump with the residence time of 0.5-1.5 h, feeding water and simultaneously adding ozone with the ozone adding quantity of 20-50 mg / L, and carrying out a catalytic oxidation reaction; and c, allowing the effluent of the catalytic oxidation reactor to self-flow through a pipeline mixer, adding the flocculant PAC in the pipeline mixer with the PAC adding quantity of 2-4 mg / L, allowing the wastewater after mixing to enter a secondary filter, carrying out micro-flocculation and filtration treatment, allowing clear water after filtration to enter a clear water pool, and meeting requirements of discharge or reuse.

The invention relates to ionic liquid with amino acids and a preparation method and application of the ionic liquid. In the ionic liquid with the amino acids, negative ions are amino acids, and positive ions are the positive ions without amino or with amino. The functionalized ionic liquid with the amino acids has the advantages that in cyclic carbonate synthesis through catalysis of carbon dioxide and epoxy compounds, the yield and the activity are high, cocatalyst and other solvents are not needed, the reaction conditions are mild, the stability is high, no pollution to the environment is generated, and green and environmental friendliness are achieved.

The invention provides a rare-earth doped modified graphene composite material gas sensitive element for detecting NOx and a preparation method of the gas sensitive element, and relates to a gas sensitive element for detecting the NOx and the preparation method of the gas sensitive element, solving the problems that an existing gas sensitive material is low in sensitivity, slow in response, and poor in resistance to factors except gas concentration. The rare-earth doped modified graphene composite material gas sensitive element for detecting the NOx is prepared from graphene, distilled water, a cupric acetate solution, a ceric nitrate solution, a sodium hydroxide solution and a glucose solution; an obtained rare-earth doped modified graphene composite material is mixed with a dispersant and a dispersion solution is dropwise added to the surface of a gold interdigital electrode to prepare the rare-earth doped modified graphene composite material gas sensitive element. The preparation method comprises the following steps: 1, preparation of the rare-earth doped modified graphene composite material; and 2, assembling of the composite material gas sensitive element.

The invention provides a preparation method of tetrafluoropropene HFO-1234yf, comprising the following steps of: using pentafluoropropane chloride and H2 as reaction raw materials or using perfluoropropane as a reaction raw material, firstly forming 1,1,1,2,2-perfluoropropane intermediate product fluid, and then removing HF under the action of an HF-removing catalyst to prepare 2,3,3,3-tetrafluoropropene (HFO-1234yf). CHxCl3-xCFD2cfCFDx3 is used as an original raw material so as to overcome the defect that raw materials are not easily available; in addition, the reaction is easy to operate and the output is high. The prepared HFO-1234yf has advantages of zero ODP and low GWP, and can be used as an ideal substitute for new-generation automobile air conditioner refrigerant.

The invention relates to a black ceramic material and a preparation method thereof and belongs to the inorganic nonmetallic material field. The black ceramic material comprises the following components in parts by weight: 1.82-3.7 parts of Gr2O3, 10.9-18.18 parts of TiO2, 1.94-4.13 parts of V2O5, 6.06-11.91 parts of MnO, 8-14 parts of Fe2O3, 0.001-0.01 part of Ni and 12-24.3 parts of SiO2. The black ceramic material is sintered by use of mill tailings and vanadium extraction tailings as the raw materials, and the solar absorptivity of the obtained black ceramic material is 0.85-0.90.

The invention relates to a low-mercury catalyst for synthesizing vinyl chloride. The catalyst is characterized by comprising the following components, by weight: 2.5-3.5% of HgCl2; 0.1-12.5% of BiCl3; 0.15-15% of ZnCl2; 0.1-7.00% of TiCl4; 2.75-3.25% of CuCl2; 0.3-8.3% of VCl3; 0.3-8.3% of rare earth chloride; 3-8.5% of BaCl2; and 62.5-75% of C. In the invention, BiCl3, ZnCl2, TiCl4, CuCl2, VCl3, as well as BaCl2 that are cheap and has catalytic performance and rare earth chloride are employed to substitute part of HgCl2 for preparing the low-mercury catalyst, the HgCl2 content of which can be reduced to less than 3.5% while the catalytic performance is fully guaranteed. Thus, not only is the energy consumption reduced, but the product cost of the catalyst is also lowered. Prepared by a step impregnation method, the low-mercury catalyst in the invention is characterized by simple process, effectiveness, energy saving, environmental protection, and convenient operation, and simultaneously can overcome problems existing in prior art, thus being suitable for the second-stage process of vinyl chloride synthesis.

The invention discloses a back electrode in dye-sensitized battery structure, comprising a conductive substrate, raster shape copper indium selenide film formed on the conductive substrate and platinum film formed at the sunken area of the copper indium selenide film. Compared with the traditional platinum electrode, the invention greatly reduces cost of back electrode while ensuring catalytic action of platinum on dye sensitization reaction, cost of the whole solar cell is indirectly reduced, and meanwhile light transmittance of back electrode is improved; by adjusting raster structure of back electrode, reflectivity can be effectively increased, thus the path of incident light in the interior of solar cell is lengthened and light absorption rate is improved.

The invention relates to an imidazolium perrhenate ionic liquid with amino groups as well as a preparation method and an application of the imidazolium perrhenate ionic liquid. The structural formula of the imidazolium perrhenate ionic liquid with the amino groups is shown as the formula (I). According to the preparation method, 3-bromopropylamine hydrobromide or 2-bromoethylamine hydrobromide is mixed with imidazolium under nitrogen protection, then the mixture is dissolved in absolute ethyl alcohol and subjected to a reflux reaction at 85-95 DEG C for 20-25 h, and an imidazolium bromide ionic liquid is obtained; the imidazolium bromide ionic liquid with amino groups and NH4ReO4 are subjected to heating reflux until no ammonia gas is emitted, cooled to the room temperature and filtered, solids are subjected to rotary evaporation and vacuum drying, and the imidazolium perrhenate ionic liquid with the amino groups is obtained. When used for catalyzing an epoxy compound to synthesize cyclic carbonate, the ionic liquid has the advantages that the yield and the activity are high, a promoter or other solvents are not needed, reaction conditions are mild, the stability is high, repeated recycling is realized and the like.

The invention relates to a synthesis process of resorcinol, which takes cyclohexane with -OH substituent group or =O substituent group at the location 1 and the location 3 as raw material, and takes water as a solvent. The resorcinol is obtained by catalytic dehydrogenation at the temperature of 150 to 300 DEG C and the pressure of 0.1-1.7MPa for 3-10h; wherein, the water is taken as a reaction medium, and the dehydrogenation catalyst is chosen from Pd, Pt or Ni series. The process has simple synthetic route and simple process; the reaction is easily controlled; the water is taken as the solvent, so less three wastes are generated, and the synthesis process of the resorcinol is environmentally friendly and has less cost; meanwhile, as the catalyst is chosen from the Pd, the Pt or the Ni catalysts, the catalyst has the advantages of good catalytic selectivity, high activity and high reaction conversion rate, and the resorcinol obtained is easily purified with high yield.

The invention discloses a two-dimensional graphene-coated copper composite material with a core-shell structure and a preparation method and application thereof. The structure of the graphene-coated copper composite material is a core-shell structure formed by coating nano-copper particles with outer-layer graphene, the graphene-coated copper composite material is constructed through an electrostatic adsorption self-assembly method, after graphene is coated with copper, copper particles can be prevented from being oxidized, the intrinsic catalytic capacity and conductivity of the composite material are guaranteed, expansion / compression of metal particles can be controlled, the synergistic effect between the two materials is promoted, and therefore the integrity of the composite material isremarkably improved. The two-dimensional graphene coated copper composite material with the core-shell structure has excellent electromagnetic shielding performances.

The invention discloses a photoelectrochemical aptamer sensor and a preparation method and application thereof. The sensor comprises a working electrode, the reaction end face of which is modified with a composite film, wherein the composite film is composed of a graphite phase carbon nitride nanosheet composite material jointly modified by gold nanoparticles / cerium dioxide quantum dots; and a specific aptamer probe is self-assembled on the surface of the composite film. The preparation method comprises the following steps: modification of CeO2QDs / Au / g-C3N4 and fixation of the specific aptamer probe. The photoelectrochemical aptamer sensor disclosed by the invention has the advantages of high stability, long service life, strong anti-interference capability, wide detection range, low detection limit and the like, can realize specific detection of target objects in media such as water bodies and organisms, and is high in utilization rate, high in use value and good in application prospect. The preparation method of the sensor has the advantages of simple process, convenience in operation, safety, low cost, no pollution, high manufacturing efficiency and the like, is suitable for large-scale preparation and is beneficial to industrial application.

The invention discloses a load type nickel base doped catalyst for biomass tar splitting and a preparation method thereof. The catalyst takes a spherical gamma-Al2O3 carrier as an inner core and takes three metal dioxides NiO, Fe2O3 and La2O3 as active components loaded on the surface of the spherical gamma-Al2O3 carrier, wherein the percentages by weight of the components are as follows: 6.0-15.0wt% of NiO, 3.0-9.0wt% of Fe2O3, 2.0-8.0wt% of La2O3 and the balance of gamma-Al2O3. The preparation method comprises the steps of: dissolving and evenly mixing nickel salt, ferric salt, lanthanum salt and urea; transferring the mixture to a container in which the gamma-Al2O3 carrier is loaded and the sealing the mixture; and carrying out heating, sedimentation, filtration, washing, drying and calcination on the mixture to obtain the catalyst product. The catalyst is high in activity, low in production cost and long in service life and has the effect of effectively preventing the carbon deposition and the high-temperature sintering in the using process.

The invention relates to a wall flow type particle filter carrier coating method adopting organic sol. The method is characterized by comprising the following steps that a wall flow type particle filter is arranged in aluminum oxide sol and roasted after being taken out, and the wall flow type particle filter covered with an alpha-Al2O3 coating is formed; in the step A, suspension liquid containing a potassium element catalyst is prepared; in the step B, the wall flow type particle filter covered with the alpha-Al2O3 coating and obtained in the step A is immersed in the suspension liquid obtained in the step B; after standing is conducted for a period of time, the wall flow type particle filter is conducted, residual suspension liquid hanging to the surface is removed, drying is conducted, and after roasting, the wall flow type particle filter coated with the potassium element catalyst is obtained. For the current situation that a wall flow type particle filter coated with water-series catalyst suspension liquid can generate adverse influences on the catalysis effect of the catalyst, the copolymer of the methacrylic acid derivative is adopted as the surface active agent, the catalyst suspension liquid is stabilized, stabilization of the suspension liquid is promoted, and accordingly it is guaranteed that after coating of the catalyst, the original catalysis effect of the catalyst is still kept.

The invention discloses a synthesis method of a solvent green 3. According to the synthesis method, a target product is obtained by taking 1,4-dihydroxy anthraquinone and p-toluidine as raw materials, ethanol as a solvent, boric acid as a catalyst, a 1,4-dihydroxy anthraquinone leuco body as an initiator, sodium hydrogensulfite as an antioxidant and benzene as an azeotrope agent of a system through condensation reaction. According to the synthesis method, the ethanol with a low boiling point is used as the solvent and the solvent green 3 is hardly dissolved in the ethanol, so that the yield of a product is improved and the recycling energy consumption of the solvent is also reduced; the 1,4-dihydroxy anthraquinone leuco body is used as the initiator, has the effect of a reaction initiator and also has a catalytic action in a reaction process; the activity of the 1,4-dihydroxy anthraquinone leuco body can be guaranteed in the presence of the antioxidant, namely the sodium hydrogensulfite, and the initiation and catalysis effects are improved.

The invention relates to a photocatalytic degradation device for copper slag pollutants and a using method thereof. The device comprises a case, a stabilizing mechanism is installed at the bottom endof the case, a positioning mechanism is connected into the case, a chemical mixing mechanism is installed on the surface of the left end of the case, and a water inlet is connected to the surface of the left end of the chemical mixing mechanism. According to the invention, after a placing screen is positioned, an external connecting wire of the case can be connected with an external power supply,and then a case cover is closed; when the case cover is closed, the case cover presses the movable block to shift through a guide block; and when the case cover moves to a certain position, the guideblock makes contact with a pressing switch, then the pressing switch is pressed down, a catalytic lamp installed on the case cover is turned on, and therefore the catalytic lamp can conduct photocatalytic degradation on internal liquid medicine and copper slag pollutants. The photocatalytic degradation device provided by the invention can achieve a good catalytic degradation effect on copper slagpollutants.

The invention discloses a polymer carrier supported catalyst composite material as well as application and a preparation method thereof. According to the present invention, a powder catalyst is supported and fixed on the waste or product polymer material by using an impregnation-melting method so as to prepare the molded easily-circulating supported catalyst, such that various defects existing in the direct use of the powder catalyst are solved; the catalyst material has the advantages of high quality, guaranteed catalytic capability, simple preparation process, easy control and low cost. According to the method, recycling of the waste plastics can be achieved, the waste plastics and conventional chemical raw materials are used for preparing the catalytic material for wastewater or waste gas treatment, so that environmental friendliness is achieved, waste is treated with waste, and maximization of material resource utilization is achieved. The supported catalyst is large in specific surface area, low in bulk density, high in mechanical strength, high in porosity, large in fluid flux, large in loading capacity, good in chemical stability and low in production cost, and can be applied to the fields of Fenton reaction, Fenton-like reaction, SCR catalytic reduction and catalytic combustion.

The invention discloses an ammonia process SCR-SNCR coupling flue gas denitrification reactor which comprises a denitrification body. The denitrification body comprises a hearth, a transition section, a catalyzing section and a gas outlet section, a first reducing section is arranged between the hearth and the transition section, a second reducing section is arranged between the transition section and the catalyzing section, the periphery of the first reducing section is sleeved with an annular ammonia spraying mechanism, and the periphery of the second reducing section is sleeved with an ammonia equivalent injection mechanism. The annular ammonia spraying mechanism and the ammonia equivalent injection mechanism are both connected with an ammonia adding system, and a multi-channel gas mixer is arranged between the second reducing section and the catalyzing section. The catalyzing section is provided with at least one layer of catalyst module. The SCR-SNCR reactor is simple in overall structure, reasonable in design and low in cost, nitric oxide treatment efficiency is greatly improved, ammonia spraying operation is more uniform and comprehensive, a reducer and nitric oxide can be mixed more fully for reacting, reaction efficiency is high, the effect is good, and the reactor is good in airtightness, more environmentally friendly and safer.

A motorcycle's silencer with a detachable catalytic converter is composed of a silencer, an exhaust tube with a catalytic converter fixing tube, and a catalytic converter fixed in its fixing tube. It features that the one or both ends of said fixing tube are connected to said exhaust tube in movable mode, so detaching the catalytic converter easily.