18results about How to "Enhanced Surface Acidity" patented technology

The invention belongs to the technical field of NH3 catalytic oxidation catalysts, and particularly relates to a preparation method and application of a surface defect-rich catalyst for NH3 catalytic oxidation, and the preparation method comprises the following steps: (1) mixing heteropolyacid, a molecular sieve and deionized water, grinding, carrying out vacuum drying, and calcining in an inert atmosphere to obtain catalyst carrier powder; (2) weighing a manganese precursor salt and an auxiliary agent precursor salt, dissolving the manganese precursor salt and the auxiliary agent precursor salt in water to prepare an aqueous solution, adding the catalyst carrier into the aqueous solution of the manganese precursor salt and the auxiliary agent precursor salt, carrying out vacuum drying, and calcining in an inert atmosphere to obtain a supported catalyst; and (3) reducing the supported catalyst in a mixed reducing atmosphere containing CO / inert gas to obtain the catalyst with rich surface defects. According to the method disclosed by the invention, rich defect sites can be constructed on the surface of the catalyst, the NH3 catalytic oxidation activity of the catalyst under a wide temperature window is promoted, and meanwhile, the N2 selectivity is improved.

The invention provides a synthetic method of p-tert-butylcatechol, and belongs to the field of industrial catalysis. The preparation method comprises the following steps: mixing and stirring catechol, a composite catalyst and a mixed solvent A for 20-40 minutes, introducing inert gas to expel air, then introducing isobutene, reacting for 4-6 hours in an environment of 110-130 DEG C, filtering and separating to obtain a reaction solution and the composite catalyst, and purifying the reaction solution to obtain the p-tert-butylcatechol. When the quaternary ammonium salt chitosan is swelled, a fluffy net-shaped structure is formed, and acidic sites of the hierarchical pore beta zeolite are gradually exposed; the cerium dioxide and the tungsten trioxide bring more and stronger acid centers, the tungsten trioxide enhances the surface acidity of the cerium dioxide, and meanwhile, cerium and tungsten have a synergistic effect, so that the catalytic activity of the composite catalyst is further improved.

The invention discloses flame-retardant particles for plastic woven mesh cloth and a preparation method of the flame-retardant particles, and belongs to the technical field of plastic woven cloth preparation, and the preparation method comprises the following steps: step S1, hydrophobic treatment of a modified intumescent flame-retardant system; s2, adding the hydrophobic modified intumescent flame-retardant system, gamma-aminopropyltriethoxysilane and a modified synergist into a mixing machine, uniformly mixing, putting into a screw extruder, carrying out melt extrusion, cooling, drying, and pelletizing to obtain flame-retardant particles for plastic woven mesh cloth; hydrophobic treatment is carried out on the surface of a modified intumescent flame-retardant system by using octadecyl methacrylate, so that the hygroscopic property of the modified intumescent flame-retardant system is effectively avoided, the compatibility of flame-retardant particles and a base material is improved, in addition, due to introduction of a modified synergist, the catalytic char-forming efficiency during combustion is improved, the flame-retardant property is enhanced, and the flame-retardant property is improved. And meanwhile, honeycomb-shaped pores in the surface can also adsorb micromolecular gas released during combustion, so that the release of toxic gas is reduced.

The invention discloses a medium and low temperature type phosphorus-containing cerium manganese copper tin composite denitration catalyst. The catalyst is composed of cerium phosphate, manganese oxide, copper oxide and tin oxide. The preparation method of the catalyst comprises the following steps: 1, adding cerous nitrate into a pyrophosphoric acid aqueous solution, and uniformly stirring to obtain a solution A; 2, adding urea to obtain a solution B; 3, carrying out hydrothermal reaction to obtain a phosphate product C; 4, pouring manganese acetate, copper acetate and a tin tetrachloride solution into the phosphate product C for dipping to obtain a compound D; and 5, drying and roasting the compound D to obtain the catalyst. The catalyst disclosed by the invention has excellent catalytic activity, a wide temperature window and a relatively high removal rate on nitrogen oxides in medium and low temperature regions; according to the invention, a hydrothermal synthesis method is combined with an impregnation method, so that the catalyst has larger specific surface area and surface acidity, the activity of the catalyst is improved, the catalyst has better water resistance and sulfur resistance, the preparation process is simple, the raw materials are easy to obtain, and the catalyst is easy to popularize and apply.

The invention discloses lignin-derived nitrogen-doped solid acid as well as a preparation method and application thereof, and relates to the technical field of solid acid preparation. Comprising the following steps: S1, uniformly mixing lignin and derivative salts thereof with a nitrogen-containing reagent according to a certain proportion, transferring the mixture into a reaction kettle, preserving heat for a period of time at a certain temperature, cooling, washing and drying to obtain a lignin nitrogen-doped carbon sphere material; s2, transferring the obtained lignin nitrogen-doped microspheres into a tubular furnace, keeping the lignin nitrogen-doped microspheres at a certain temperature for a period of time in a nitrogen atmosphere, and washing and drying after carbonization is completed to obtain a lignin nitrogen-doped carbon sphere carrier; s3, transferring the obtained lignin nitrogen-doped carbon sphere carrier and a sulfonating reagent into a three-neck flask according to a certain solid-to-liquid ratio, reacting for a certain time, and washing and drying to obtain the lignin nitrogen-doped solid acid.

This invention relates to a volatile organic compound (VOC) adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, followed by vanadium modification to obtain a Li-V-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.8%–4.5%, and the V content is 0.2%–1%. The adsorbent material obtained by this invention, using a 5A molecular sieve as a matrix and modified to obtain the Li-V-5A adsorbent material, has advantages such as good adsorption effect on low-carbon hydrocarbons and strong resistance to sulfur poisoning, especially high adsorption and removal rate of ethane.

The invention discloses an ultralow-temperature manganese-based SCR (Selective Catalytic Reduction) denitration catalyst and a preparation method thereof. The SCR catalyst comprises manganese oxide, zirconium oxide and tin oxide, in the catalyst finished product, the content of ZrO2 is 26-32 mol%, the content of SnO2 is 13-16 mol%, and the balance is MnO2 in terms of the total content of metal oxides being 100 mol%; by accurately controlling the contents of manganese oxide, zirconium oxide and tin oxide and the addition amount of cetyltrimethylammonium bromide (CTAB), the pore structure of the SCR catalyst is optimized, the activity and selectivity of the catalyst are improved, the performance of the catalyst is improved, and the catalyst can keep higher denitration efficiency under different working conditions; the conversion rate of the ultralow-temperature SCR catalyst to NO reaches 95% or above under the conditions that the reaction space velocity is 100,000 h <-1 > and the temperature is 80 DEG C, and the conversion rate is maintained at a high level for a long time.

The invention discloses a preparation method of a MnOx-FeOx-titanium silicalite molecular sieve low-temperature denitration catalyst, which comprises the following steps: dropwise adding ethyl silicate into a tetrapropylammonium hydroxide aqueous solution, stirring, simultaneously dissolving tetrabutyl titanate into isopropanol, independently hydrolyzing, mixing the two solutions, and reacting at the temperature of 60-80 DEG C for 2-3 hours to obtain the MnOx-FeOx-titanium silicalite molecular sieve low-temperature denitration catalyst. Heating to remove alcohol and supplementing evaporated water in time to obtain a mixture; transferring the mixture into a reaction kettle for hydrothermal treatment, cooling to room temperature, centrifuging, washing and drying to obtain white precipitate; grinding the white precipitate, transferring to a muffle furnace, and roasting to obtain a carrier; and dissolving manganous nitrate and ferric nitrate in deionized water to form a mixed solution, immersing the carrier powder into the mixed solution, stirring, drying to obtain a solid, grinding the solid, transferring into a muffle furnace, and roasting to obtain the MnOx-FeOx-TS-1 catalyst. According to the preparation method disclosed by the invention, the Ti element is introduced into the carrier under the condition that the pore diameter structure is not changed, so that the MnOx-FeOx catalyst loaded on TS-1 shows excellent NOx conversion efficiency in a low-temperature NH3-SCR (Selective Catalytic Reduction) reaction.

The invention discloses a silicon-aluminum material and a preparation method thereof. After being roasted at 500-700 DEG C, the silicon-aluminum material has the following properties: the content of silicon dioxide is 20-75wt%, and the pore volume is 0.70-1.5 mL / g; and the specific surface area is 280-400 m < 2 > / g. The preparation method of the silicon-aluminum material comprises the following steps: (1) uniformly mixing a silicon-containing compound A, an auxiliary agent A, an aluminum-containing compound and water to obtain a material flow A; (2) carrying out heat treatment on the material flow A in the presence of organic amine to obtain a material flow B; (3) uniformly mixing a silicon-containing compound B, an acidic aluminum-containing compound, an alkaline aluminum-containing compound and water, and treating to obtain a material flow C; (4) mixing the material flow C with an auxiliary agent B to obtain a material flow D; and (5) mixing the material flow B and the material flow D, carrying out hydrothermal treatment, and then washing, drying and roasting to obtain the silicon-aluminum material. The provided silicon-aluminum material shows certain molecular sieve characteristics, has the characteristics of high B acid content and stepped pore channel distribution, and is especially suitable for being used as a carrier of a hydrogenation catalyst.

The invention provides a synthesis method of fluxapyroxad, which belongs to the technical field of chemical synthesis and comprises the following steps: mixing nickel chloride hexahydrate, tetraethoxysilane and potassium hydrogen oxalate in water, performing high-temperature treatment, cooling, separating and drying to obtain a nickel-based silicate carrier; loading aluminum chloride and ferric citrate on a nickel-based silicate carrier to obtain a composite catalyst; the preparation method comprises the following steps: mixing 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic acid, thionyl chloride, N, N-dimethylformamide and a composite catalyst, heating and stirring, cooling and separating, and carrying out reduced pressure distillation to obtain a mixed solution; mixing 3 ', 4', 5 '-trifluorobiphenyl-2-amine, toluene, the composite catalyst and the mixed solution, heating and stirring, cooling and separating, performing reduced pressure distillation, stirring and pulping, centrifugally washing and drying to obtain the fluxapyroxad. The fluxapyroxad prepared by the method is higher in purity and yield, an additional acid-binding agent does not need to be added in the preparation process, the influence caused by byproducts is reduced, and the fluxapyroxad has a good industrial application prospect.

The present invention discloses a non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier, a preparation method and an application thereof. The general formula of the oxygen carrier is LaFe 1‑x P x O3. In the biomass gasification stage, the non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier exchanges heat and mass with the biomass, and the lattice oxygen in the non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier partially oxidizes the biomass to generate synthesis gas, while the non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier is reduced to generate a reduced oxygen carrier; in the oxidation stage, the reduced oxygen carrier reacts with oxygen in the air to achieve oxygen replenishment and restores to the structure before the reaction with the biomass, thereby achieving the cyclic regeneration of the oxygen carrier. The oxygen carrier can effectively improve the surface acidity of the oxygen carrier, and adjust its surface reactivity and lattice oxygen migration ability.

The application provides a denitration catalyst, a preparation method and application thereof, and the denitration catalyst comprises a layered MCM molecular sieve carrier and a composite oxide active component loaded on the surface of the layered MCM molecular sieve carrier, and the chemical formula of the composite oxide active component is CeCuO x The denitration catalyst has high surface acidity and redox capacity, the CeCuO x The alkali metal poisoning resistance of the catalyst is improved, so that the catalyst has high catalytic activity and nitrogen selectivity in the use temperature range of 250-400 DEG C after being poisoned by alkali metal.

The invention discloses a bifunctional catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The bifunctional catalyst comprises a carrier and an active component, the carrier comprises CeO2; ceO2 has oxygen vacancy; the active component comprises Pd. The bifunctional catalyst has high reaction activity for catalyzing one-step synthesis of methyl isobutyl ketone from acetone in application, the conversion rate of acetone reaches 47%, the selectivity of methyl isobutyl ketone is 96% or above, and the bifunctional catalyst has high stability and is suitable for industrial production of one-step synthesis of methyl isobutyl ketone from acetone.

The invention provides an anti-toxic denitration catalyst and a preparation method and application thereof, and belongs to the field of environmental protection and environmental catalysis, foam metal copper is used as a carrier, a copper-containing Ni-W-P-Se oxide is used as an active component, the active component is loaded on the foam copper carrier by adopting an electrochemical means, and the anti-toxic denitration catalyst is prepared. And the copper active component is diffused to the surface of the surface active component through a heat treatment means, so that the low-temperature denitration efficiency of the catalyst can be remarkably improved, the denitration catalyst is excellent in sulfur resistance and water resistance, and extremely high stability and restorability are kept.

The invention relates to a molecular sieve type high-temperature denitration catalyst as well as a preparation method and application thereof, and belongs to the technical field of porous inorganic material preparation. The method comprises the following steps: synthesizing a layered SAPO-18 molecular sieve by utilizing a morphology regulator, an organic template agent and a structure-directing agent synergistic self-assembly and hydrothermal method, carrying out high-temperature roasting on the synthesized layered SAPO-18 molecular sieve, then carrying out active metal Cu ion exchange, and finally carrying out high-temperature roasting to prepare the Cu-type layered SAPO-18 molecular sieve catalyst. The molecular sieve prepared by the method has a two-dimensional nano layered structure, can expose more active sites, and is beneficial to mass transfer and diffusion of reactants.

This invention relates to a VOCs adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, and then modifying it with titanium to obtain a Li-Ti-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.65%–4.2%, and the Ti content is 0.15%–0.85%. The adsorbent material obtained by this invention is a Li-Ti-5A adsorbent material obtained by modification using a 5A molecular sieve as the matrix. This material has advantages such as good adsorption effect on low-carbon hydrocarbons and good thermal stability, especially with better adsorption effect on propane.

The application discloses a low-temperature denitration catalyst and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. 60 The catalyst is prepared by doping fullerene C 60 The pi electron system of C 60 is highly delocalized on the three-dimensional curved surface thereof, so that C 60 has excellent electron transfer capacity; and the doping proportion of C 60 can effectively promote the rapid progress of the catalytic reaction. Therefore, the catalyst prepared by the application can be applied to low-temperature flue gas denitration, can significantly improve the denitration efficiency, can widen the active temperature range of the catalyst, and can solve the problems of poor low-temperature activity, insufficient sulfur resistance and easy poisoning of traditional catalysts.

The invention relates to an oxyacid group modified transition metal oxide catalyst as well as a preparation method and application thereof. In the transition metal oxide catalyst modified by the oxyacid group, the oxyacid group is positioned on the surface of the catalyst and is in chemical bond connection with metal atoms on the surface of the catalyst; preferably, the oxysalt group is at least one of a sulfate group, a phosphate group and a phosphite group, and the transition metal oxide is at least one of manganese oxide, cerium oxide, chromic oxide and titanium oxide.