236 results about "Selective catalytic oxidation" patented technology

The invention provides a micro-oxygen purifying method used for removing harmful gas in yellow phosphorus tail gas, which is characterized in that mixed gas containing HCN, PH, H2S, COS and CS2, with the speed of 1000-5000/h is heated to 150-200 DEG C by a heat exchanger and sent to a catalytic hydrolysis reactor; more than 90% of HCN and 85% of COS and CS2 can be respectively hydrolysed as NH3, CO, H2S and CO2; subsequently, the mixed gas enters a selective catalytic oxidation reaction; PH3 and H2S are catalysed and oxidated as P2O5 and S; harmful gas in the mixed gas which is disposed twice is removed further in a fine decyanation reactor and the sulfide thereof is removed by a fine desulfurization reactor; NH3 is selectively catalysed and oxidated as N2, thus purifying the mixed gas. The method of the invention leads the violent toxic matter to be converted into non-toxic matter, generates no secondary pollution, recovers the outgrowth sulphur, improves the utilization ratio of the resource, eliminates the environmental pollution due to waste gas exhausting, and has the advantages of simple process, few investment and low running expense.

The invention provides a method for preparing gluconic acid through a selective catalytic oxidation reaction by taking glucose as a raw material and gold/mesoporous carbon as a catalyst. Conditions are that: the catalyst is the carbon-loaded gold catalyst with a regular mesoporous structure, and the concentration of glucose is 0.01 to 2M; oxygen is used as an oxidant, and the velocity range of the oxygen is 100 to 1,000 ml.min<-1>; and the reaction temperature range of the glucose selective oxidation reaction is between 25 and 80 DEG C, reaction pressure is normal pressure and reaction time is 0.5 to 120h. In the invention, an action of the mesoporous carbon-loaded nano gold for the glucose selective catalytic oxidation is used, the glucose with a certain concentration is converted into the gluconic acid at normal temperature and normal pressure, so that energy consumption of the reaction process is low, the catalyst is stable and can be recycled and the method is a method for preparing the green gluconic acid.

The present invention is one kind of Ti-Si molecular sieve in MWW structure and its synthesis and application, and belongs to the field of inorganic chemical technology. The Ti-Si molecular sieve in MWW structure with Ti, Si and O as the skeleton elements and without B adverse to selective catalytic oxidation is prepared through synthesizing intermediate crystal material and roasting directly or after acid treatment. It is suitable for use as the catalytic oxidation catalyst, and has less surface faults, great specific surface area up to 450 sq m/g, high catalytic oxidation performance and other advantages.

The invention discloses a cuprum (II) coordination compound catalyst of selective catalytic oxidation thioether and a preparation method of the cuprum (II) coordination compound catalyst, and relates to the technical field of transition metal coordination polymers. The chemical formula of the coordination compound is as shown in the specification, wherein pasp is an N-(2-picolyl)-L(D)-aspartic acid negative ion ligand. A preparation process of the cuprum (II) coordination compound catalyst comprises the steps that cupric salt and N-(2-picolyl)-L(D)-aspartic acid are adopted as reaction raw materials to react in a volatilization condition at a room temperature, and a homochiral crystalline material is obtained. A synthetic method is mild in condition, high in yield, convenient to operate, and good in reproducibility. The reaction of adopting a sample of the coordination compound catalyst to oxidize different thioethers into corresponding sulphoxides is high in yield, and the cuprum (II) coordination compound catalyst is simple to prepare and facilitates large-scale popularization.

The invention relates to a preparing method for flower-shaped BiOI microspheres, and belongs to the field of nanometer photocatalytic material preparing. The preparing method includes the following specific preparing steps that bismuth nitrate is added into nitric acid to obtain a solution A; ionic liquid [Bmin]I and nonionic surfactants PVP are added into distilled water, heated and stirred to form micro-emulsion B; then the solution A and the micro-emulsion B are mixed to be poured into a high pressure kettle, the pH is controlled to range from 1 to 4, centrifuging, washing and drying are carried out after a hydrothermal reaction, and the flower-shaped BiOI microspheres are obtained. According to the preparing method, an ionic liquid micro-emulsion method is adopted for the first time, no organic solvent is added, and the environment-friendly requirement is met; ionic liquid is used as an iodine source and solvents, is also used as an oil phase to form micro-emulsion drops and has the important effect on forming of the flower-shaped BiOI microspheres; the prepared flower-shaped BiOI microspheres have the high application value in the fields of pollution treatment, new energy preparing, selectivity catalytic oxidation and the like.

The invention discloses a mesoporous molecular sieve-based catalyst used for ammonia removing, and a preparation method and applications thereof. The mesoporous molecular sieve-based catalyst comprises a mesoporous molecular sieve and at least one active ingredient; specific surface area of the mesoporous molecular sieve-based catalyst ranges from 400 to 750m<2>*g<-1>; the at least one active ingredient is embedded into pore passages of the mesoporous molecular sieve; particle size of the active ingredient ranges from 2 to 50nm; the active ingredient is a transition metal oxide; transition metal loading amount of the transition metal oxide accounts for 2 to 8wt% of the total weight of the mesoporous molecular sieve-based catalyst. According to the preparation method, different mesoporous molecular sieve carriers are prepared via in situ synthesis, and the mesoporous molecular sieve-based catalyst is obtained via loading of a certain amount of the active ingredient via dipping-rotary evaporation. When the mesoporous molecular sieve-based catalyst is used for an ammonia selective catalytic oxidation removing system, 100% catalytic efficiency can be achieved at 300 DEG C, energy consumption is reduced, and at the same time, catalyst catalytic efficiency and N2 selectivity are increased.

The invention relates to the technical field of electro-catalysis selective oxidation synthesis, in particular to a method for preparing corresponding aldehydes or acids by performing catalytic oxidation on alcohols by an electro-catalysis membrane effectively at high selectivity. Electro-catalytic oxidation and a membrane separation technology are coupled, a system that aldehydes or acids are synthesized by using alcohols is used as a research system, and the electro-catalysis membrane used as an anode and an auxiliary electrode are connected through a guide line and a direct-current stabilized power supply to form an electro-catalysis membrane reactor. In an aqueous solution containing alcohol reactants and electrolyte, operation parameters comprising working voltage and current density in the membrane reactor are controlled and adjusted, and the surface of the membrane is introduced to generate reactive oxygen species such as hydroxyl radicals and the like under the action of a low-voltage electric field (1-6V), so the aldehydes or acids can be controllably and efficiently prepared by using the alcohols. Compared with the conventional process, the method has the advantages of low energy consumption, high selectivity, controllable process and the like, is easy to operate, can be industrially implemented, and can be widely used for catalytic oxidation controllable preparation in an organic synthesis field.

The invention provides a method for preparing a p-benzoquinone compound through selective catalytic oxidation of a phenol compound. The method is characterized in that the p-benzoquinone compound is highly selectively prepared through a reaction of a raw material the phenol compound in a liquid medium under mild conditions under the action of a transition metal compound primary catalyst and a stellate molecule cocatalyst with oxygen or an oxygen-containing gas as an oxidant.

The invention relates to a production process for methyl benzol methanoic acid using paraxylene;, comprising following steps: a selective catalyze oxidation reaction is implemented on the paraxylene and the oxygen in the air; solid-liquid separation is implemented on the reactant, so that methyl benzaldehyde, carboxyl benzaldehyde, terephthalic acid and other high-melting and crystallizable subsidiary products can be removed; the paraxylene of the reactant is removed in the paraxylene distillation apparatus; a vacuum distillation is implemented on the material in a gap rectifying tower; so that the light-component impurities can be removed further; in the rectifying tower of methyl benzol methanoic acid crude product, the top of the tower is implemented on an impurity removal separation for refining the methyl benzol methanoic acid; the refined methyl benzol methanoic acid liquidoid is arranged into a cooling crystallizer for cooling and crystallization so as to get methyl benzol methanoic acid crystallization product with uniform particles. The invention has the advantages of safety and reliability, high yield, low production cost and environmental friendliness.

The invention relates to a high-activity hydrotalcite loaded gold nanocluster catalyst and a preparation method thereof, and belongs to the technical field of catalysts. The catalyst has a chemical formula: AuNCs/(M<2+>)(M<3+>)-LDH, wherein the AuNCs is a gold nanocluster, and the (M<2+>)(M<3+>)-LDH is hydrotalcite. The hydrotalcite has the structural formula: [(M<2+>)1-x(M<3+>)x(OH)<2>]<x+>(A<n->)x/n.mH2O), wherein the M<2+> is any one or two of Mg<2+>, Ni<2+> and Cu<2+> which are divalent metal ions, M<3+> is any one of Fe<3+>, Cr<3+> and Al<3+> which are trivalent metal ions, x ranges between 0.2 and 0.33, A<n-> is one of CO3<2->, NO<3->, Cl<-> and SO4<2-> which are anions, and m is the number of carried interlayer water. The AuNCs-SR serves as a precursor, the carboxyl on the AuNCs-SR as a ligand interacts with a laminate with positive charges on the (M<2+>)(M<3+>)-LDHm, AuNCs-SR is connected to the (M<2+>)(M<3+>)-LDHm in an anchoring way, and the ligand is removed by calcinating to obtain the catalyst with the chemical formula of AuNCs/(M<2+>)(M<3+>)-LDH. The catalyst has intrinsic alkalinity and hereby has excellent activity in the selective catalytic oxidation reaction of alcohol by selective catalysis under the alkaline-additive free condition.

The invention discloses an SCR (Selective Catalytic Reduction) catalytic conversion muffler, which comprises a front cavity body, a carrier cavity body, a back cavity body and an air outlet pipe that are sequentially and coaxially connected, wherein a catalyst carrier is arranged in the carrier cavity body; a catalyst is coated on the catalyst carrier; a porous air inlet pipe is vertically arranged on the front cavity body; through holes which are uniformly and circumferentially arranged are arranged on the pipe wall of the porous air inlet pipe located in the front cavity body. The SCR catalytic conversion muffler is characterized in that the bottom of the porous air inlet pipe is hung in the air; and a closed end cover is arranged at the bottom of the porous air inlet pipe. According to the SCR catalytic conversion muffler disclosed by the invention, a urea solution is effectively prevented from crystallizing, and the atomization degree of the urea solution is improved. Meanwhile, the air inlet pipe is vertically arranged so that the overall structure of the catalytic conversion muffler is more compact, the condition that the catalytic reduction reaction is affected by deposited particles in an exhaust gas flow blocking a carrier passage is avoided. While the porous air inlet pipe effectively reduces system noises, the distribution uniformity of reactants in the carrier can be remarkably improved, thereby effectively improving the catalytic conversion of tail gas.

The invention relates to a diesel oil high-efficiency selective catalytic oxidation desulfurization method. A titanium nanometer material catalyst and an oxidant are contacted with the diesel oil to selectively catalyze oxidation of the diesel oil to remove the second component under the condition that the first component competes for oxygen consumption. The diesel oil comprises a first componentand a second component; the first component comprises one or more of olefins, aromatic hydrocarbon, or cycloalkanes; the second component is a sulfur-containing compound comprising mercaptan, thioether, thiophene, benzothiophene, dibenzothiophene or 4,6-dimethyldibenzothiophenes. The titanium nanometer material catalyst prepared by the invention selectively removes sulfur-containing compounds suchas dimethyl dibenzothiophene (DMDBT) and other macromolecules in diesel oil under the condition of competitive oxidation of complex components such as olefins, cycloalkanes and aromatic hydrocarbons,the desulfurization efficiency of the diesel oil reaches 98.2%, and has good application prospect in the field of oxidative desulfurization of diesel oil.

The invention relates to a method for preparing an efficient oxidation catalyst through a plasma-assisted sol gel method. Active particles in plasma are used for decomposing organic matter and nitrate in gel at normal temperature, and the oxidation catalyst with the active components being MnOx or MnCeOx is prepared. The method has the advantages that firstly, catalytic oxidation is performed on nitrogen oxide, and high activity and selectivity are achieved; secondly, a wide temperature adaptation window is arranged; thirdly, the preparation technology is simple, cost is low, and the method can be widely used for the preparation process of denitration catalysts performing selective catalytic oxidation on flue gas.

The invention relates to a preparation method for high-enantioselectivity synthesized (S)-omeprazole. The method comprises under catalysis of a complex formed by chiral alcohol ligand (R)-(+)-1, 1, 2-triphenyl-1, 2, glycol and alkoxy titanium, utilizing an oxidant to a prochiral compound omeprazole thioether to perform selective catalytic oxidation to obtain optically pure enantiomer (S)-5-methoxy-2-[[(4-methoxy-3, 5-dimethyl-2-pyridyl)-methyl] sulfinyl]-1H-benzimidazole ((S)-omeprazole). (S)-omeprazole further reacts with alkali to form salt, and (S)-omeprazole metal salt with medical values is obtained. The preparation method is economical and simple and convenient to operate, optical purity and chemical purity of a product are high, and the preparation method is suitable for industrialized production.

The invention relates to a method for selectively catalyzing and oxidating the alcohol compounds to prepare the aldehyde or ketone compounds, which comprises the steps that the highly active supported nanometer gold catalysts, water or water and cosolvent and alcohol compounds are put in an autoclave, the oxygen or air is pumped in the autoclave so as to carry out the reaction among the mixtures for 6 to 8 hours on the conditions of a reaction pressure ranging from 0.2 to 1.2MPa and a reaction temperature ranging from 100 to 130 DEG C; then the organic phase is separated and the aldehyde or ketone compounds is obtained. The conversion rate of the alcohol compounds ranges from 80 per cent to 83 per cent and the selectivity of the aldehyde or ketone products reaches 90 per cent to 100 per cent. The invention has the advantages of simple process, low production cost, environmental friendliness, easy separation and cycling use of the catalysts, etc.

The invention relates a method for diesel oil selective catalytic oxidation desulfuration. The method comprising the steps of: (1) mixing catalyse zinc benzoate with diesel oil according to the concentration of 1400~2000ug/g; (2) add catalyst boracic acid and diesel oil to diesel oil with 1~10 mass %; (3) add the diesel oil mixed with the two catalyst into high-pressure autoclave; (4) feed oxygen and agitate under 130~180Deg. C for 20~150min, separate oxidation diesel oil and zinc benzoate after cooling, water scrubbing and reclaiming boracic acid; (5) use extracting agent with 60~90 mass % N, N-dimethyltoluamide and 10~40 mass % ethyl alcohol, under 20~80Deg. C, mix oxidation diesel oil and the extracting agent with volume ratio of 4~6, stewing phase-splitting; (6) use carclazyte adsorption processing extracting diesel oil and get the refining straight distillation diesel oil; (7) After distilling, the extracting agent phase can be reused.

The invention relates to a One-pot and one-step method for preparing a polymer monomer 2,5-furandicarboxylic acid from relatively cheap fructose as a raw material, through catalytic dehydration and selective catalytic oxidation in a non-alkaline reaction system. According to the method, solid acid and chlorinated salt are used as a dehydration catalyst, single oxides or composite oxides of non-noble metals such as cerium, iron and zirconium are used as an oxidation catalyst, ionic liquid is used as a solvent, air or oxygen is used as an oxidant, a separating step is not required, and under a certain reaction condition, the 2,5-furandicarboxylic acid is prepared through one-step catalytic conversion of the fructose. The cheap fructose is used as the raw material, so that the cost of the rawmaterial is greatly reduced; the cheap non-noble metal oxidation catalyst is used for replacing the conventional noble metal oxidation catalyst, so that the cost of the catalyst is greatly reduced; the ionic liquid is used as the solvent, so that introduction of the separating step (removal of the dehydration catalyst and purification of HMF) and strong alkali is avoided, and thus the preparationprocess of 2,5-furandicarboxylic acid is simpler, more economical and more environmentally-friendly.

The invention discloses synthesis and desulfurization application of porous manganese dioxide, and belongs to the technical field of catalyst preparation. Manganese acetate or potassium permanganate is used as a raw material, ethanol, glucose or hydrogen peroxide is used as an additive, ammonium carbonate or ammonium bicarbonate is added as a pore-enlarging agent, and hydrothermal treatment is performed in a high-pressure reaction kettle; and washing, drying and roasting are carried out to obtain manganese dioxide with different crystal forms and a hierarchical pore structure. The synthesis method disclosed by the invention is simple in process and high in repeatability; oxygen vacancies in manganese dioxide can be regulated and controlled through crystal form control, so that the oxygen storage capacity and the oxidation-reduction capacity of the catalyst are further improved, and the catalytic activity is further improved; the hierarchical pore structure exposes rich active sites, sothat the hierarchical pore structure shows higher catalytic activity, elemental sulfur selectivity and stability in a selective catalytic oxidation H2S reaction.

The invention provides a catalyst for synthesizing nonanal by high-selectivity catalytic oxidation of oleic acid. The catalyst is multi-metal mesoporous composite oxide and takes high-activity transition metal, alkaline earth metal or rare-earth metal as a catalytic oxidation active center, wherein the transition metal comprises Cr, Mn, Fe, Co, Ni and Cu; the alkaline earth metal comprises Mg, Ca, Sr, Ba and Al; the rare-earth metal comprises La, Ce, Nd, Eu and Yb. Compared with an existing catalyst, the catalyst has the following advantages that (1) the obtained catalyst still has a stable mesoporous structure under a relatively high temperature; (2) in a reaction process, an oleic acid conversion rate and the selectivity and yield of the nonanal are relatively high and reaction conditions are moderate; (3) any solvent and any additive are not added into a reaction system so that pollution to the environment is not caused and target products are easy to separate, so that the catalyst can be industrially produced in a large batch.