1225 results about "Modified zeolite" patented technology

The modified octahedral zeolite is prepared through the once exchange reaction of octahedral zeolite, phosphorus compound and ammonium compound, the further reaction inside exchange slurry with introduced RE solution, filtering, washing and roasting in vapor. The catalyst contains the modified octahedral zeolite 5-45 wt%, clay 15-85 wt% and heat resistant inorganic oxide 15-85 wt%. The catalyst is prepared through mixing the zeolite component, clay and the precursor of the heat resistant inorganic oxide, spraying to form and washing. The catalyst has high activity stability, high gasoline yield, low coke yield, strong heavy oil cracking capacity and high heavy metal pollution resistance.

An acidic amorphous silica-amumina has a large specific surface area and a large pore volume. A carrier complex and a hydrotreating catalyst containing acidic amorphous silica-alumina, in particular a hydrocracking catalyst containing acidic amorphous silica-alumina in combination with a modified zeolite-Y, treats petroleum hydrocarbon materials to produce middle distillates. The amorphous silica-alumina has a SiO2 content of 10-50 wt. %, a specific surface area of 300-600 m2/g, a pore volume of 0.8-1.5 ml/g and an IR acidity of 0.25-0.60 mmol/g. The catalyst shows a relatively high activity and mid-distillate selectivity and can be particularly used in hydrocracking process for producing mid-distillates with a higher yield.

The invention discloses a catalyst for preparing aromatic hydrocarbon through methanol conversion. The catalyst comprises a component A and components B, wherein the mass ratio of component A to components B is 0.25-4; the component A is a modified zeolite molecular sieve and comprises 80-99wt% of molecular sieves and 1-20wt% of molecular sieve modifiers; the components B are oxide loaded metallic elements and halogen and comprise 85-95wt% of oxide, 0.5-10wt% of total metallic elements and 0.1-5wt% of halogen; and the component A and the components B are formed through squashing or extruding after being mixed uniformly. The catalyst has the following characteristics that: (1) the total recovery of benzene, toluene and xylene is higher and selectivity is high; (2) the raw material treatment capacity is large; (3) the non-aromatic hydrocarbon liquid product can serve as the solvent oil or gasoline component; (4) C4 hydrocarbon and non-aromatic hydrocarbon liquid phase products in the gas phase product can circularly enter into the catalyst bed layer, thus not only balancing the reaction heat but also improving the total recovery of the aromatic hydrocarbon; and (5) the catalyst has high activity and long life.

A method for removing arsenic species from an aqueous medium with modified zeolite minerals comprising providing an aqueous medium containing arsenic species in the form of both arsenate and arsenite, contacting the aqueous medium with an iron (II) laden zeolite mineral so that arsenic in the form of at least one of arsenate and arsenite contained in the aqueous medium can be adsorbed onto the iron (II) laden zeolite mineral forming an arsenic adsorbed iron (II) laden zeolite mineral, and separating the arsenic adsorbed iron (II) laden zeolite mineral from the aqueous medium.

The invention relates to a method for hydrogenating naphthenic base distillate to produce lubricating oil basic oil. The naphthenic distillate is used as raw material and a one-stage in series hydrogenation process of hydrotreating-hydrodewaxing-hydrofinishing is adopted to produce the lubricating oil basic oil. Ordinary hydrotreating catalysts are filled in the upper part of a hydrotreating reaction area, and hydrotreating catalysts containing modified zeolites are filled in the lower part of the hydrotreating reaction area. The hydrodewaxing and hydrofinishing reaction areas are the same as those of the prior art, and are filled with hydrodewaxing catalysts and hydrofinishing catalysts. Compared with the prior art, the method disclosed by the invention has the advantages that system energy consumption is reduced, the pour point of a product is properly reduced, and the stability of the product is effectively improved.

The present invention relates to a highly active midbarrel hydrocracking catalyst and a process for the preparation thereof. The support of the catalyst comprises a modified zeolite-Y, a modified zeolite-beta, alumina, etc. The composite of the modified zeolite-Y and zeolite-beta exhibits a good synergistically catalytic effect. The catalyst prepared by supporting Group VIB and/or Group VIII metal components is useful in the hydrocacking of heavy oils with high content of sulfur and nitrogen to produce high quality middle distillates with maximum output. The activity of and selectivity to middle distillates of the catalyst are remarkably raised simultaneously. Moreover, the solidifying point of the produced diesel is remarkably lowered.

The invention relates to a catalyst for a normal paraffin hydroisomerization reaction and a preparation method as well as an application thereof. The catalyst has the characteristics that the activity is high in an n-hexane hydroisomerization reaction, and the selectivity and stability are good for a double-branched-chain product. The catalyst comprises modified zeolite molecular sieve ZSM-12 treated by alkaline solution and noble metal of family VIII, wherein the zeolite molecular sieve ZSM-12 adopts zeolite molecular sieve ZSM-12 containing organic amine template. The preparation method of the catalyst comprises the following steps of: desilication of zeolite molecular sieve ZSM-12 containing template after being treated with alkaline solution to obtain zeolite molecular sieve ZSM-12 with high content of mesoporous, and preparing isomerized catalyst by loading Pt. The catalyst is applied in the normal paraffin hydroisomerization reaction, when the catalyst is applied, the n-hexane hydroisomerization reaction is carried out on a fixed bed miniature reactor, the reacting raw material n-hexane is fed into the reactor by a force pump, and is contacted with the catalyst to react in the reactor after being mixed with hydrogen in a mixer.

The invention relates to a method for preparing hollow cavity type ZSM-5 modified zeolite molecular sieve, and aims to solve the problems that the microcellular structure diffusion admittance is narrow, the modified zeolite molecular sieve has lower relative degree of crystallinity, and the adjustable range of apertures inside molecular sieve is small, thereby facilitating macromolecule reaction limited by diffusion. The invention adopts at least one 0.1-8.5 mol/L acid solution of hydrochloric acid, nitric acid, sulphuric acid or acetic acid to treat ZSM-5 molecular sieve raw powder with the silica alumina ratio SiO2/Al2O3 being 20-1000 and the particle size being 0.4-10 Mum for 1-8 h; then at least one 0.1-5.0 mol/L aqueous alkali of sodium hydroxide, magnesium hydrate, potassium hydroxide, sodium carbonate or sodium bicarbonate is used for treatment for 1-48 h at 20-90 DEG C; and at least one 0.1-8.5 mol/L acid solution of hydrochloric acid, nitric acid, sulphuric acid or acetic acid is used for treatment for 1-48 h at 20-90 DEG C to obtain the modified ZSM-5 molecular sieve. The problems are well solved, and the invention can be used in industrial production of macromolecule catalysis and transformation catalysts.

The invention discloses a catalyst for preparing paraxylene by methyl alcohol conversion, a preparation method thereof and application. The catalyst provided by the invention is obtained by the method that the surface acidity and the pore structure of a metal modified zeolite molecular sieve are decorated by siloxy group compound; metal content is 0.1-10 wt% of total content of catalyst, and decorated zeolite molecular sieve bearing amount which is accounted by Si is 0.1-8 wt% of total content of catalyst; aromatic hydrocarbon content in obtained hydrocarbon products is more than 60 wt%, the selectivity of paraxylene in aromatic hydrocarbon is more than 85 wt%, and the selectivity of paraxylene in xylene isomers is more than 95 wt%.

A catalyst for cracking the waste plastics to produce fuel oil (gasoline or diesel oil) may be the DeLaZSM-5 prepared by modifying zeolite molecular sieve ZSM-5 or the composite cracking catalyst containing at least two carried metallic oxides as active components. Its advantages are low cracking temp and high output rate and quality of fuel oil.

The present invention is one kind of composite zeolite biofertilizer and its preparation process. The zeolite is first modified to loosen its frame structure, raise the content of effective components, such as P2O5 and K2O, in zeolite, and raise its unique chemical and physical performance, ion exchange property, adsorption and catalytic property. The modified zeolite is then compounded with several kinds of organic matter as carrier, inoculated with composite ferment bacteria for fermentation into base fertilizer, and compounded with ammonium humate fertilizer, nitrogen fertilizer, phosphate fertilizer and potash fertilizer and trace element fertilizer, so as to form the composite green fertilizer capable of providing plant with multiple nutrient components to raise the yield and quality of plant.

The invention discloses a preparation method of a magnetic chitosan/cationic surface active agent modified zeolite adsorbent, which comprises preparing the magnetic chitosan/zeolite with ferroferric oxide, the zeolite and the chitosan serving as raw materials; mixing the magnetic chitosan/zeolite with cationic surface active agent solution; and obtaining the magnetic chitosan/cationic surface active agent modified zeolite adsorbent through constant-temperature water-bath oscillation. The prepared adsorbent can be applied to removing organic pollutants such as humic acid and congo red in water and removing heavy metal pollutants such as copper ions. Efficient utilization of cheap natural resources is achieved. The prepared product is suitable for removing soluble organic pollutants in drinking water, anionic dye in printing and dyeing wastewater and the heavy metal pollutants such as the copper ions, and has the advantages of high utilization rate, good separation effect, low price and the like.

The invention discloses bentonite/modified zeolite compound super absorbent cat litter which comprises components of raw materials in percentage as follows: 50%-60% of sodium bentonite, 15%-25% of modified zeolite, 5%-8% of carboxymethylcellulose, 2%-4% of nanocarbon, 10%-15% of bran and 3%-5% of polyacrylamide. According to the cat litter, the zeolite is modified, so that the water-absorbing property of the zeolite can be remarkably improved; and then the bentonite, the nanocarbon and the bran are compounded, so that the cat litter is obtained, and the water-absorbing property and the deodorization function of the zeolite can be improved. After urine is absorbed, the cat litter can be put into a closestool and is pumped away; and the cat litter is convenient to use without polluting the environment.

The invention relates to a catalytic method for the transalkylation/dealkylation of organic compounds, consisting in bringing a supply comprising organic compounds into contact with a catalyst containing a first zeolitic component that is selected from among: a) one or more zeolites having crystalline structure ITQ-13; b) one or more zeolites having crystalline structure ITQ-13, which are modified either by means of selectivation or with the incorporation of one or more metals, or both; and c) a mixture of a) and b). The invention also relates to a catalyst comprising one or more modified zeolites having crystalline structure ITQ-13.

The invention relates to a slow release material using modified zeolite as a carrier, and a preparation method and application thereof. The slow release material is prepared from the following components in percentage by mass: 94-98% of modified zeolite, 1-3% of chitosan and 1-3% of acrylamide. The preparation method of modified zeolite comprises the following steps: treating natural zeolite at the high temperature of 200-400 DEG C for 1.5-3 hours, crushing, screening, and soaking with 0.5-2 mol/l hydrochloric acid for 0.5-2 hours to carry out framework dealuminization; and drying zeolite subjected to acid treatment, grinding with a powder device to obtain 200-300 mesh fine powder, thereby obtaining the modified zeolite. 1-3% of chitosan and 1-3% of acrylamide are added and evenly mixed with 94-98% of modified zeolite to obtain the slow release material. The slow release material can be added into a fertilizer to obtain the environment-friendly slow release fertilizer, wherein the slow release material accounts for 5-20% by mass of the fertilizer. The slow release fertilizer has the advantages of lower nutrient release rate in soil, long fertilizer effect period, and less pollution to the environment and water body, and has favorable functions of holding water, loosening soil, keeping soil from packing together and the like.

The invention discloses a preparation method of acrolein, taking biological glycerol as the raw material and the modified zeolite supported heteropolyacid as catalyst, the method prepares acrolein directly by dehydration reaction. 18 to 30 catalyst are put in the middle section of a normal pressure continuous fixed bed reactor, with the volume space velocity of 1 to 10 h<-1>; under the protection of N2, the catalyst bed raises the temperature to 180 to 540 DEG C, and the biological glycerol solvent which is added with inhibitor is put into the fixed bed reactor from a micro pump; after gasified, the glycerine solution reacts by the catalyst bed. After reaction, the product is absorbed by acetone, then is separated and purified, thus obtaining acetone. The invention adopts the alkali metal, phosphoric oxides, alkali metal compound improved catalyst as carrier to carry heteropoly acid catalyst which is green and environmental catalyst and has the advantages of high activity, regeneration property, no pollution, simple reaction, operation process, low production cost, high mole selectivity of acrolein and high conversion rate of biological glycerol.

The current invention refers to the LNT and the SCR catalysts designed for combined LNT-SCR applications. LNT catalysts are based on proton-conducting oxides of fluorite structure, namely Ca (Sr)—La—Ce (Zr, Pr) mixed oxides in which up to 40 mol-% of lanthanum is replaced by calcium and/ or strontium, and up to 66 mol-% of cerium is replaced by zirconium and/or praseodymium, further combined with Pt—Pd or Pt—Pd—Rh precious metal components. SCR catalysts are Cu/zeolite modified by citrate treatment or Cu—Ce, Mn—Ce or Co—Ce/modified zeolite.