191results about How to "High catalytic oxidation activity" patented technology

The preparation process of modified Ti-Si molecular sieve TS-1 with MFI structure includes mixing water solution of Si and synthesized TS-1 molecular sieve, the reaction of the mixture at 80-190 deg.c in the reactor for 0.1-150 hr, filtering, washing and drying. The modified Ti-Si molecular sieve TS-1 has certain amount of inert component Si covering the surface and pores and less Ti content in the surface and pores and thus less side reaction in the said places, and these results in raised catalytic oxidation activity, prolonged service life and less side product.

The invention discloses a method for simultaneously removing sulfur, niter and mercury from smoke based on catalytic oxidation. The method is characterized by comprising the following steps of: (1) arranging a catalytic reactor in a dust-removed smoke duct, wherein a catalyst for promoting oxidizing reaction of NO and HgO is filled in the catalytic reactor; (2) allowing the dust-removed smoke to pass through the catalytic reactor, wherein under catalysis of the catalyst, the reaction speed of the NO, the HgO and O2 is increased and the NO and the HgO are oxidized into NO2 and Hg<2+>; and (3) introducing the smoke subjected to catalytic oxidation into an absorber with an absorption solution, wherein the absorption solution is used for absorbing NO2, Hg<2+> and SO2 from the smoke. The invention also discloses a system applicable to the method. According to the method and the system, the sulfur, the niter and the mercury are removed from the smoke; external oxidant is not required to be added; preparation, transportation and storage of strong oxidant are avoided; operating cost is reduced; and economy and safety of the system are improved.

The invention provides a tin-silicon molecular sieve. The tin-silicon molecular sieve contains silicon, tin and oxygen elements. All or a part of crystal grains have internal cavities or cavity structures, a total specific surface area is greater than or equal to 300m<2>/g, and a ratio of an external specific surface area to the total specific surface area is greater than or equal to 10%. The tin-silicon molecular sieve has good catalytic oxidation effects.

A high-effective catalyst used for removing indoor formaldehyde at normal temperature includes a carrier, a noble active component, and an additive. The carrier is a mesoporous oxide including at least one of Al2O3, TiO2, SiO2, cerium oxide, cobalt oxide and manganese oxide; the active component includes a less amount of at least one of noble metals Pd, Pt, Au and Ag; the additive is at least one of Na, K, Fe, Co, Ce and Ni. The catalyst can completely convert the formaldehyde into CO2 and H2O at normal temperature under relative humidity of 50-90%. The catalyst has high catalytic-oxidizing activity and strong anti-moisture capability and is suitable for removal of the formaldehyde in a sealed or a semi-sealed space.

The present invention provides a fine finishing of nonmetalic mineral resource and inorganic chemical industry field, characterized in that natural attapulgite clay is produced to sizing agent which solid content is about 10% after being pretreated by hydrochloric acid, a certain quality attapulgite clay and cerous salt are mixed to dissolve in the de-ionized water, the solution is evenly blended by electric mixer, wherein Ce3+ relative to the concentration range of solution is 0.001mol/l-0.5mol/l, the concentration range of the attapulgite clay is 2-50g/l; further adding a certain quality HMT, and mixing evenly, mol ratio of HMT and cerous salt is between 2:1-20:1; the blended solution is placed in the 70-100 Celsius water bath to react 1-5h under the mixing of the electric mixer, removing and cooling to the room temperature, calcining 1-5h under the temperature 200-700 Celsius after filtering, washing and drying, attapulgite powder loading nanometer cerium oxide is obtained. The attapulgite powder of the invention has a homogeneous load, better dispersivity, has no complex equipment, and less chemical material sorts, lower cost and better experiment repeatability.

The invention provides a catalyst for tail gas purification and a preparation method of the catalyst for tail gas purification. The catalyst for tail gas purification comprises an alumina supporter, cerium dioxide borne on alumina and a precious metal active component borne on the surface of the cerium dioxide. The alumina supporter and the cerium dioxide are prepared according to the sediment hydrothermal method. The precious metal active component is borne according to the hydrothermal in-situ reduction sediment method. According to the catalyst for tail gas purification, the interaction between the cerium dioxide and a precious metal species is strong, the cerium dioxide supporter can generate more oxygen vacancies, oxygen molecules are activated and converted into a reactive oxygen species, and therefore the activity of catalytic oxidation is improved. Interspersion and mutual contact are conducted between the alumina and the cerium dioxide, the mutual insulation function is achieved, sintering with the single cerium oxide serving as a supporter can be avoided, and the thermal stability of the alumina at a high temperature is remarkably improved.

The invention belongs to the field of titanium silicon molecular sieve, and more specifically provides a titanium silicon molecular sieve, and a synthetic method and applications thereof. The titaniumsilicon molecular sieve is composed of crystal particles with a particle size ranging from 5 to 200nm via aggregation; the particle size of the titanium silicon molecular sieve ranges from 0.3 to 5<mu>m; the I960/I550 value ranges from 0.7 to 0.85. The invention also provides a cyclic ketone oxidation method. The cyclic ketone oxidation method comprises a step of contact of cyclic ketone, and anoxidizing agent with a catalyst. The catalyst contains the titanium silicon molecular sieve. The crystal of the titanium silicon molecular sieve is high in I960/I550 value, and is large in effective framework ti content. When the titanium silicon molecular sieve is used in oxidation reaction, the catalytic oxidation activity, and the reaction product selectivity are increased obviously, and excellent catalytic stability is achieved. The titanium silicon molecular sieve is capable of realizing aggregation of small crystal particles in crystallization growth process instead of simple physical aggregation of the small crystal particles, and micron order is achieved.

A modification method for a titanium-silicon molecular sieve comprises the following steps of mixing the titanium-silicon molecular sieve, a titanium source, a protective agent, an alkali source, a noble metal source, a reducing agent and water according to the proportion of 100:(0.001-1):(0.0001-5):(0.005-5):(0.005-10):(0.005-20):(500-10,000), and carrying out hydro-thermal treatment, wherein the protective agent is selected from one or more of polybenzimidazole, polypropylene, polyethyleneglycol, polystyrene, polyvinyl chloride, polyethylene and derivatives thereof, an anionic surfactant, a cationic surfactant, a non-ionic surfactant, glucose and cyclodextrin; and the reducing agent is selected from one or more of hydrazine, borohydride and sodium citrate. The titanium-silicon molecular sieve prepared by the method has high content of framework titanium and has high oxidation activity and selectivity as well as good stability.

The invention provides a method for modifying a titanium-silicon molecular sieve, and belongs to the technical field of inorganic chemicals and the synthesis of inorganic chemicals. The method comprises the following steps of: adding the titanium-silicon molecular sieve, a protective agent and a noble metal source in a solution containing organic amine, evenly mixing the mixture, adding a hydrating solution of silicon in the mixing solution and evenly mixing the mixed solution, putting the mixedsolution in a reaction kettle for hydro-thermal treatment, and recycling the sieve. The titanium-silicon molecular sieve modified by the method has obviously high catalytic oxidation activity, selectivity and stability.

The invention belongs to the technical field of the chemical industry, which relates to a load type nano gold catalyst for preparing lactone by catalyzing air oxidation alpha, omega-diol. The invention adopts nano iron oxide as a carrier of a gold catalyst, the iron oxide is synthesized by a hydrothermal method, and nano iron oxide carriers with different crystal types and patterns can be preparedby calcination. The gold catalyst is prepared by a precipitation settling method, the prepared catalyst has small gold particles and good dispersivity, the interaction of gold and the carrier is strong, the gold catalyst represents an excellent activity in the preparation of gamma-butyrolactone by the direct oxidation of 1,4-butanediol through catalyzing air and the preparation of delta-valerolactone by oxidizing 1,5-pentanediol and conforms to the requirement of green chemistry, and the generation of lactone by oxidizing alpha, omega-diol in one step is realized. A magnetic iron oxide carrier can be obtained by selecting a proper preparation method, and the invention is convenient to separate and recover the catalyst and has better industrial application prospect.

The invention relates to a synthesis method of a titanium-containing molecular sieve, and particularly relates to a method for preparing a titanium-containing molecular sieve by adopting a stepped crystallization also called as a lattice vacancy filling method. The invention provides a method for fast preparing a TS-1 molecular sieve, which is simple and feasible and relatively low in cost. According to the technical scheme, the stepped crystallization preparation method of the titanium-containing molecular sieve comprises the following steps: 1, sufficiently hydrolyzing a tetrapropylammonium hydroxide solution added with an inorganic silicon source to prepare gel; 2, transferring the gel to a sealed reaction kettle, carrying out pre-crystallization to prepare a pure silicon molecular sieve guiding agent, then slowly dropwise adding a titanium source to the pure silicon molecular sieve guiding agent, and continuously pre-crystallizing for 1-6 hours to obtain a mixture to be crystallized; 3, crystallizing the mixture to be crystallized, controlling the temperature to rise to 160-200 DEG C, and carrying out hydrothermal crystallization for 6-48 hours to obtain the titanium-containing molecular sieve.

The invention provides a palladium gallium oxide double-metal nano-catalyst capable of efficiently catalyzing methane to combust and preparation and belongs to the technical field of functional materials. PdGa double-metal nano-particles are loaded on a gamma-Al2O3 carrier, and then the carrier is fired to form a Pd-GaOx/Al2O3 catalyst. The loading amount of metal palladium is 1.0wt%. A preparation method comprises the following steps: simultaneously reducing palladium acetylacetonate and gallium chloride in an oleylamine system by adopting a liquid-phase co-reduction method, so as to form PdGa double-metal particles with a uniform size; loading the metal particles on an Al2O3 carrier by adopting an immersion method, wherein the Pd loading amount is 1.0wt%; and firing a load type catalyst at 450 DEG C to form the Pd-GaOx/Al2O3 nano-catalyst. The Pd-GaOx/Al2O3 nano-catalyst prepared by the invention has the advantages that a preparation process is simple, the size of the nano-particles is uniform, and the nano-catalyst has a good application prospect in the field of catalysis.

The invention relates to a method for synthesizing a titanium silicon zeolite material, which comprises the following steps of: adding all silicone zeolite and/or boron silicon zeolite in an alkaline aqueous solution, mixing uniformly, adding a titanium source, mixing uniformly, treating under hydro-thermal treatment conditions, and recovering the products to obtain the titanium silicon zeolite material. The method has the characteristics of low cost and good repeatability. Compared with the prior art, the obtained zeolite material has high oxidative activity in an oxidizing reaction and good selectivity of the target product.

The invention discloses a smoke denitration NO (Nitric Oxide) oxidation catalyst by catalytic oxidation, and a preparation method thereof. The NO oxidation catalyst is prepared from titanium crosslinking clay as a carrier and copper oxide and vanadium oxide as active ingredients, wherein the titanium crosslinking clay carrier is prepared by taking acetone as a dispersing agent and crosslinking and aging titanic acid butyl acetate and sodium base montmorillonite turbid liquid under an acid condition. Copper nitrate and ammonium metavanadate solutions are used as the precursors of the active ingredients, are fixed on the carrier by an immersion method, and are dried and calcined by program heating to obtain the smoke denitration catalyst by catalytic oxidation. In the catalyst, the copper capacity is 2-10%, and the vanadium capacity is 0.5-5%. The smoke denitration catalyst by catalytic oxidation has the advantages of good sulfur and water tolerance, good reproducibility and good denitration effect.

This invention relates to a method for synthesizing crotonic acid by selective oxidation of crotonaldehyde. The method adopts crotonaldehyde as the raw material, acetone, acetic acid, benzene or toluene as the solvent, phosphomolybdic acid as the main catalyst, and V2O5 as the cocatalyst, and reacts at 30-100 deg.C and 0.3-0.9 MPa in the presence of O2 to obtain crotonic acid. Phosphomolybdic acid can be supported by such carriers as active carbon, SiO2, gamma-Al2O3 or molecular sieve. Therefore, the catalyst can be separated from the reaction solution by filtration, and dried in air at 120 deg.C for recycling. The supported catalyst has such advantages as simple preparation, high catalytic activity, high selectivity, and high stability, and can be used repeatedly.

The invention discloses a monatomic palladium-cobalt bimetallic nano-catalyst for efficiently catalyzing benzene oxidation, and belongs to the technical field of functional materials, wherein PdCo bimetallic nanoparticles are loaded onto a gamma-Al2O3 carrier, firing is performed to form a Pd1Co1/Al2O3 catalyst, and the loading capacity of the metal palladium is 0.4 wt%. The preparation method comprises: in a dichlorobenzene system, simultaneously pyrolyzing and reducing palladium acetylacetonate and octacarbonyldicobalt by adopting an oil-phase one-step pyrolysis method to form PdCo bimetallic particles with uniform size, and loading the metal particles onto an Al2O3 carrier by adopting an impregnation method, wherein the Pd loading capacity is 0.4 wt%; and carrying out hydrothermal roasting on the supported catalyst at a temperature of 800 DEG C to form the Pd1Co1/Al2O3 nano-catalyst. The Pd1Co1/Al2O3 nano-catalyst prepared by the method is simple in preparation process, the double metals are in monatomic dispersion, and the Pd1Co1/Al2O3 nano-catalyst has good application prospect in the field of catalysis.

The invention provides a formaldehyde degradation catalyst and a preparation method thereof. The catalyst is formed by compounding 0.1 to 0.5 percent by mass of nanogold and 0.1 to 0.5 percent by mass of nano platinum which are loaded into a porous matrix, wherein the porous matrix is a covalent organic porous polymer COP-4. By taking the covalent organic polymer as a carrier and taking precious metal, namely the nanogold and the nano platinum as active components, the active components are highly dispersed on a porous carrier to efficiently catalyze the degradation of formaldehyde while adsorbing the formaldehyde at room temperature, and therefore the air detergency to the formaldehyde is effectively improved.

The invention pertains to the technical field of chemical industry, in particular to a preparation method of delta-valerolactone by using the load-type nano-gold catalyst. The using catalyst of the invention adopts a deposition precipitation method for preparation, in particular to the Au/TiO₂ catalyst with the nano size after the calcination synthesis at certain temperature and the deposition of gold on the titanium dioxide. The catalyst is characterized by good dispersion of activity, small particles of gold and good stability, and can be used for catalytic air direct oxidation of 1, 5-pentanediol for the preparation of delta-valerolactone, so as to realize the one-step oxidation of 1, 5-pentanediol, further to generate the delta-valerolactone. The air is used as the oxidant during the oxidation process of 1, 5-pentanediol to replace the strong oxidants in the traditional methods, such as peracid, halogen oxides, nitrogen oxides and so on, thus avoiding the violent reaction conditions and the pollution substances generated by oxidants, which is in line with the requirements of green chemistry. The catalyst has the advantages of easy recovery and regeneration, can maintain a higher activity after a plurality of repeated uses and has higher industrial application value.

The invention discloses a universal method for preparing a high-stability noble metal monatomic catalyst, and belongs to the technical field of functional materials, wherein a MCo (M is Pd, Pt, Au andthe like) bimetal nano-crystal is loaded on a commercial gamma-Al2O3 carrier, and then shock heating roasting is performed to form the noble metal monatomic catalyst. The preparation method comprises: in a dichlorobenzene system, simultaneously pyrolyzing and reducing a noble metal precursor and octacarbonyldicobalt by adopting an oil-phase one-step pyrolysis method to form MCo bimetallic particles with uniform size, and loading the metal particles onto a commercial gamma-Al2O3 carrier by adopting an impregnation method; and pushing the loaded catalyst into a tubular furnace heated to about 800 DEG C in advance, and roasting for 3 h to form the noble metal monatomic catalyst. According to the invention, the preparation process of the monatomic catalyst is simple, noble metals are in monatomic dispersion, the method has universality and is suitable for preparing various noble metal monatomic catalysts, and the obtained catalyst has good application prospects in the field of catalysis.