13 results about "Catalytic oxidation" patented technology

The invention discloses a method and a system for modularized combined treatment of high-difficulty organic waste water, and the treatment system comprises: a primary settling tank, an adjusting tank, a reinforced flocculation tank, a precipitation separation tank, a secondary flocculation settling tank, a buffering water tank, a pH adjusting tank, a primary honeycomb microelectrolytic tank, a flocculation settling tank, a secondary honeycomb microelectrolytic tank, an intermediate tank, a heat exchanger, a microwave catalytic oxidation device, a secondary catalytic oxidation pot, and a re-oxidation filter pipe. The treatment method adopts a combined technical scheme of a multistage honeycomb iron carbon microelectrolytic module, a reinforced flocculation module and a microwave electro-catalytic oxidation module; the invention has the characteristics of high applicability, good treatment effect, and unit modularization; the modules can be combined and cascaded freely according to the waste water condition, and thus different waste water treatment effect requirements and waste water quantity requirements are adapted; the operation cost is low; the sludge amount is low; no secondary pollution is caused; and the method is an environment-friendly high-difficulty waste water treatment method.

The invention relates to a one-step copolymerization method for preparing an efficiently-selective carbon nitride photocatalyst based on energy environment backgrounds, and belongs to the field of carbon material science. The efficiently-selective photocatalyst serves as a simple pathway for acquiring complicated organic oxidation products, converting solar energy into chemical energy and storing the chemical energy, and a support is provided for sustainable utilization of energy, so that a mild and efficient photocatalyst is extremely sought. According to the method, 3, 3', 4, 4'-BTDA (benzophenonetetracarboxylic dianhydride) with long triplet lives is creatively introduced based on melem with a tri-s-triazine structure, conduction and valence band values of carbon nitride are adjusted, the triplet lives are prolonged, so that singlet oxygen is generated, and selective photocatalyst oxidation capacity of the carbon nitride is improved. The carbon nitride photocatalyst prepared by the method does not contain precious metals, is low in cost and simple to operate and solves the problem of application limit of the carbon nitride in the elective photocatalyst oxidation field, and batch production of the photocatalyst can be achieved.

The invention discloses a method for electrochemical pretreatment on methyl sulcotrione pesticide wastewater. The method comprises the following steps: preparing a titanium-based tin antimony ruthenium cerium oxide electrode by using a coating-thermolysis method, feeding high-concentration methyl sulcotrione wastewater through an electrolytic cell which takes the titanium-based tin antimony ruthenium cerium oxide electrode as an anode, and continuously treating the wastewater for a certain time under certain current density. The titanium-based tin antimony ruthenium cerium oxide electrode is very good in stability, high in oxygen evolution potential and high in catalysis and oxidation capabilities. According to the method, the titanium-based tin antimony ruthenium cerium oxide electrode is adopted to pretreat high-concentration, high-salt and hard-biochemical wastewater generated in the production process of methyl sulcotrione, and the result shows that under conditions of certain pH values, current density and treatment time, the COD removal rate of the methyl sulcotrione can be greater than 50%, the BOD/COD is increased to be greater than 0.3 from less than 0.1, and the biodegradability is greatly improved. The electrochemical oxidation of the titanium-based tin antimony ruthenium cerium oxide electrode is very applicable to pretreatment on biochemical degradation of the high-salt high-concentration wastewater generated in the production of methyl sulcotrione.

The invention discloses a mine acidic iron-containing wastewater treatment method and system. Limestone macadam with a low price is used for pre-adjusting a pH value, then the pH value is adjusted tobe more than 6 through a coal ash filter material, the oxygen content in the wastewater is increased through a multi-stage ecological drop channel, and then a catalytic oxidation reaction is carried out through manganese sand contact to remove iron in the water. An interval is formed between a regulating filter tank and a contact filter tank, and an S-shaped circuitous water flow direction is formed in the regulating filter tank and the contact filter tank, so that wastewater is in full contact with fly ash and manganese sand filter materials, and neutralization reaction and catalytic oxidation reaction effects are further improved. The consumption of electric power and external consumables is extremely low, the daily operation is unattended, only sludge in the sedimentation tank needs tobe periodically cleaned, and the mine acidic iron-containing wastewater treatment method and system are particularly suitable for unattended field environments with inconvenient traffic. Compared withthe existing sewage treatment facilities, the overall investment and the later operation and maintenance cost can be greatly reduced, and good popularization values are achieved on the standard discharge of the coal mine well wastewater and the environmental protection.

The invention discloses a monolithic catalyst with organic waste gas selective adsorption and catalytic oxidation functions, a preparation method of the monolithic catalyst and application of the monolithic catalyst in catalytic oxidation treatment of organic waste gas. A double-coating design is adopted. A first coating is a molecular sieve substrate coating, and ensures the coating firmness between a molecular sieve and a cordierite carrier. A second coating is an active component coating, and neutral silica sol is adopted to protect the activity and effectiveness of noble metals and catalytic additives on the molecular sieve. The surface coating layer of the obtained monolithic catalyst is high in loading rate, good in firmness and low in falling rate, the mechanical strength of the obtained monolithic catalyst is remarkably improved, and the service life of the obtained monolithic catalyst is remarkably prolonged. The monolithic catalyst provided by the invention can selectively adsorb VOCs and rapidly desorb generated H2O at the same time, so that the reaction is promoted to be carried out towards the catalytic oxidation direction of VOCs, and the monolithic catalyst has excellent catalytic oxidation performance for VOCs.

The invention relates to the technical field of chemical tail gas treatment, and discloses a catalyst and a catalytic oxidation deoxidation method for unsaturated hydrocarbon-containing gas by using the catalyst. The catalyst contains a carrier, and an active component, a first auxiliary agent component and a second auxiliary agent component which are loaded on the carrier, wherein the active component is selected from one or more of oxides of Pt, Pd, Ru, Rh, Ag and Ir; the first auxiliary agent component contains one or more of rare earth metal elements, IVB group metal elements and VIII group metal elements, and the second auxiliary agent component contains one or more of alkali metal elements and alkaline earth metal elements. According to the deoxidation method using the catalyst, reducing gas such as H2 does not need to be added, hydrocarbon and oxygen directly react to generate CO2 and H2O, the purpose of deoxidizing hydrocarbon-containing tail gas is achieved, and carbon deposition can be prevented.

The invention provides a modification method for energy utilization of sludge or organic waste. The method comprises the steps that the sludge or the organic waste and an oxidation nitration agent or a catalytic oxidation combustion improver are mixed and aged; or the sludge/organic waste, fire coal and the oxidation nitration agent/catalytic oxidation combustion improver are mixed and subjected to powder grinding, oxidation nitration modification/catalytic oxidation combustion improving modification is conducted on the sludge or the organic waste, and accordingly the combustion performance of the sludge/organic waste is improved. The oxidation nitration agent means the matter which can improve the combustion performance of argillation organic matter and high-internal-water cenobium organic matter in the sludge. The catalytic oxidation combustion improver means the matter which can improve the combustion performance of carbon or hydrocarbon. According to the modification method, by improving the combustion performance of the argillation organic matter and the high-internal-water cenobium organic matter in the sludge/organic waste, the combustion performance of the sludge/organic waste is improved, and accordingly the energy utilization of the sludge/organic waste is achieved.

A supported molded catalyst having increased hardness, the supported molded catalyst being capable of improving the long-term stability of a reaction for producing a conjugated diolefin by catalytic oxidative dehydrogenation from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen; and a method for producing the catalyst is provided. A molded catalyst for conjugated diolefin production, the molded catalyst being a catalyst for producing a conjugated diolefin by a catalytic oxidative dehydrogenation reaction from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen, and being produced by molding a composite metal oxide and a glass fiber-like inorganic auxiliary agent.

The invention provides a modified catalyst for gaseous-state elemental mercury oxidation and a preparation method of the modified catalyst, belonging to the technical field of mercury removal from smoke. The catalyst is the modified catalyst formed by loading a catalysis component manganese chloride, and a doping modification component ammonium molybdate on a catalytic carrier, wherein the total load of molybdenum, manganese and chlorine is 1.25-25 wt%, and the molar ratio of the three elements is (0.007-0.14): 1: 2. Experimental results indicate that via the preparation method, the three elements molybdenum, manganese and chlorine can be uniformly dispersed on the catalytic carrier to inhibit the grain agglomeration of the catalyst during the preparation process and form a more stable aggregate, thus effectively increasing the efficiency of oxidation for gaseous-state HgO; and the catalyst is very strong in catalytic oxidation performance and sulphur-resistant performance for the gaseous-state HgO in a temperature ranging from 100 to 200 DEG C, and long in endurance time; and the catalytic oxidation efficiency of converting the gaseous-state HgO to Hg<2+> is greater than 97%.

For solving the problems in the prior art, the invention provides a device and method for removing arsenic from yellow phosphorus through continuous electrocatalytic oxidation, wherein the device comprises a current controller, a cathode chamber, an anode chamber and a control system, wherein the cathode chamber and the anode chamber are isolated from each other through a permeable membrane. A working electrode and a reference electrode are arranged in the anode chamber, a stirrer is arranged at the bottom, and a counter electrode is arranged in the cathode chamber. The electrodes are respectively and electrically communicated with a current controller. One side of the anode chamber is sequentially communicated with a sedimentation tank group and a liquid separation device, and the liquidseparation device is respectively communicated with the top end of the anode chamber and the storage tank. The method is based on the device and comprises the steps: controlling to form a nitrogen atmosphere, and controlling the temperature of the anode chamber to be 55-90 DEG C; and respectively adding an electrolyte into the anode chamber and the cathode chamber, and adding yellow phosphorus into the anode chamber; standing for phase splitting after constant-current stirring reaction; and leading the solution in the sedimentation tank group to the anode chamber or the storage tank through the liquid separation device, wherein the solid phase part is a product. According to the invention, continuous production of electrocatalytic oxidation yellow phosphorus arsenic removal can be realized.

The invention discloses a ternary metal catalyst with excellent chlorine resistance and efficient catalytic oxidation of mixed VOCs, and belongs to the field of catalytic chemistry and nano science. The preparation method comprises the following steps: firstly, synthesizing ternary metal catalyst nanoparticles by adopting a solvothermal method, then loading the obtained nanoparticles on a TiO2 carrier by adopting an adsorption method, and finally centrifuging, drying and roasting to obtain the PtWM/TiO2 (M = Ru, Cr and Mn) catalyst, thereby finally achieving the excellent chlorine resistance to chlorine-containing VOCs, namely trichloroethylene (TCE) and the efficient catalyst for co-catalytic oxidation of toluene and TCE. The preparation process is simple, and the obtained PtWM/TiO2 (M = Ru, Cr or Mn) catalyst has high acidity, good chlorine resistance and excellent catalytic activity for co-catalytic oxidation reaction of toluene and trichloroethylene.

The invention relates to a preparation method of catalysts and particularly relates to a preparation method of a catalyst for catalytic oxidation synthesizing of acrolein through propylene. The preparation method comprises the following steps of: (1) preparing a composite carrier of silicon carbide and MCM-41; (2) respectively preparing precursor solutions of active ingredients, uniformly mixing and stirring the precursor solutions of cobalt, ferrum and potassium to obtain a mixed precursor solution A, uniformly mixing and stirring the precursor solutions of tungsten and manganese to obtain a mixed precursor solution B, and loading the active ingredients through an impregnation method to obtain the catalyst. When the catalyst for catalytic oxidation synthesizing of acrolein through propylene prepared by the preparation method provided by the invention is applied in a catalytic oxidation synthesis reaction of acrolein through propylene, the reaction temperature is 300 DEG C, the conversion rate of the propylene is 99%, and the yield of acrolein is 87.6%.