53results about How to "High thermal and hydrothermal stability" patented technology

A catalyst for synthesizing the intermediate oil from synthetic gas by Fischer-Tropsch reaction contains Co (5-35 Wt%), mesoporous ZrO2 as carrier (53-93), noble metal (0-2) and oxide of non-noble metal. Its preparing process includes such steps as impregnating said carrier in the aqueous solution of nitrate containing the oxide of non-noble metal or the alcohol solution of organic alkydester, and impregnating it in the equeous solution of cobalt nitrate and the nitrate (or chloride) or noble metal. It has high activity, stability, selectivity and mechanical performance.

The present invention relates to a mesoporous molecular sieve MPL-1 and its preparation process. The anhydrous composition of this molecular sieve contains at least three elements, i.e. aluminum, phosphorus and oxygen. The molecular sieve has larger pore diameters, generally 1.3 nm-10.0 nm, a larger specific surface area and adsorption capacity. It is synthesized under the hydrothermal process with an organic compound as template. Where necessary, silicon and/or titanium may be added to synthesize the aluminosilicophosphate, aluminotitanophosphate, or aluminosilicotitanophosphate molecular sieves having a mesoporous structure, and/or metal compounds may be added to synthesize derivatives of mesoporous aluminophosphate molecular sieves containing the corresponding hetero-atoms.

The invention provides a method for preparing an aluminized molecular sieve of MCM-41 (ALMCM-41). The method adopts pseudo-boehmite as aluminum source, sodium silicate as silica source, and cety ltrimethyl ammonium bromide as template. By adopting dilute sulfuric acid to regulate acid, the molecular sieve of ALMCM-41 with high hydrothermal stability is prepared thereby. The invention solves the problem of poor hydrothermal stability of the ALMCM-41 in the prior art. The crystallization retention rate of the molecular sieve of ALMCM-41 prepared in the invention can reach 15 to 50 percent after the ALMCM-41 is aged in 100 percent of steam with temperature of 800 DEG C for 2 hours. The invention can be applied in the industrial preparation of the molecular sieve of ALMCM-41.

A modified Y-type molecular sieve has a rare earth oxide content of about 4% to about 12% by weight, a phosphorus content of about 0% to about 10% by weight, a sodium oxide content of no more than about 1.0% by weight, a total pore volume of about 0.36 to 0.48 mL/g, a percentage of the pore volume of secondary pores to the total pore volume of about 20% to about 40%, a lattice constant of about 2.440 nm to about 2.455 nm, a percentage of the non-framework aluminum content to the total aluminum content of no more than about 10%, a lattice collapse temperature of not lower than about 1060° C., and a ratio of B acid to L acid of no less than about 3.50. The preparation of the molecular sieve includes ion-exchange with rare earth, hydrothermal roasting, gas phase ultra-stabilization, acid treatment, and an optional phosphorus modification.

The invention provides a secondary-pore-rich modified Y type molecular sieve containing phosphorus and rare earth, and a preparation method thereof. In the modified Y type molecular sieve, the contentof rare earth oxide is 4 to 11 wt%; the content of phosphorus is 0.05 to 10 wt%; the content of sodium oxide is no more than 0.5 wt%; a total pore volume is 0.4 to 0.48 mL/g; the pore volume of secondary pores accounts for 20 to 38% of the total pore volume; a lattice constant is 2.440 nm to 2.455 nm; the content of non-framework aluminum is no more than 10% of total aluminum content; lattice collapse temperature is no less than 1060 DEG C; and a ratio of the amount of acid B to the amount of acid L is no less than 3.50. A preparation method for the molecular sieve comprises the following steps: exchanging of rare earth; hydrothermal roasting; gas-phase ultrastable modification; acid treatment; and introduction of phosphorus. The modified Y type molecular sieve has higher heavy oil conversion activity, low coke selectivity, and higher gasoline yield, liquefied gas yield, light oil yield and total liquid yield.

The invention provides a catalytic cracking catalyst. The catalytic cracking catalyst contains clay, alumina containing an additive and a modified Y type molecular sieve. The modified Y type molecularsieve comprises 5 to 12 wt% of rare earth and no more than 0.5 wt% of sodium oxide, and has a total pore volume of 0.36 to 0.48 mL/g; the pore volume of secondary pores accounts for 20 to 38% of thetotal pore volume; a lattice constant is 2.440 nm to 2.455 nm; the content of non-framework aluminum is no more than 10% of total aluminum content; lattice collapse temperature is higher than 1060 DEGC; and a ratio of the amount of acid B to the amount of acid L is no less than 3.50. A preparation method for the catalytic cracking catalyst comprises the following steps: preparing a rare earth-containing Y type molecular sieve with a conventional cell size; carrying out roasting in a water vapor atmosphere with a temperature of 350 to 520 DEG C and a volume percentage of 30 to 95% for 4.5 to 7h; carrying out a contact reaction with silicon tetrachloride; and carrying out acid treatment. The catalytic cracking catalyst has higher heavy oil conversion activity, low coke selectivity, and higher gasoline yield, liquefied gas yield, light oil yield and total liquid yield.

A rare-earth Y-zeolite used for preparing the cracking catalyst of petroleum hydrocarbon has 4-15 wt.% of rare-earth content, 2.45-2.458 nm of crystal cell contstant, 1000-1056 deg.C of differential thermal collapse temp, and 8.3-8.8 of Si/Al ratio. Its advantages are high activity and selectivity to heavy oil and coke, good hydrogen transfer activity, and high output rate of light oil.

The invention relates to a super-stable Y-type molecular sieve containing phosphorus and rare earth, wherein the Y-type molecular sieve contains 4-11 wt% of rare earth, 0.05-10 wt% of phosphorus and 0.1-0.7 wt% of sodium oxide, and has the pore volume of 0.33-0.39 mL/g, the pore volume of the pores with the pore size of 2-100 nm accounts for 15-30% of the total pore volume, the unit cell constantis 2.440-2.455 nm, the non-framework aluminum accounts for less than 20% of the total aluminum, the lattice collapse temperature is more than 1050 DEG C, and a ratio of the amount of B acid to the amount of L acid is not less than 2.50. The preparation method comprises: preparing a rare earth-containing Y-type molecular sieve having a conventional unit cell size, calcining for 4.5-7 h at a temperature of 350-480 DEG C under 30-90% by volume of steam atmosphere, carrying out phosphorus modification treatment, and carrying out a contact reaction with silicon tetrachloride gas. According to the present invention, the Y-type molecular sieve has advantages of good hydrothermal stability, high heavy oil conversion activity, low coke selectivity, high heavy oil conversion diesel yield, high liquefied gas yield and high total liquid recovery.

The invention relates to a method for producing a low-carbon olefin, mainly solving the problems that in the prior art, the olefin contained in a reactant is easily coked and the light olefin as a product is poor in selectivity due to the high reaction temperature; and the device productivity is low and the separation cost is high due to the utilization of a large number of diluents. The method provided by the invention comprises the following steps: by taking an aliphatic hydrocarbon flow liquid which is lack of the olefin as a raw material, contacting the raw material with aZSM molecular sieve catalyst to carry out cracking reaction to generate flow liquid rich in propylene and ethylene under the conditions that reaction temperature is 500-700 DEG C, the weight ratio of a diluting agent to the raw material is (0-3):1, reaction pressure is in a range from -0.08 MPa to 0.2MPa and the liquid-phase space velocity is from 0.5 to 15 per hour. According to the adopted technical scheme, the problems are solved well. The method provided by the invention can be applied to the industrial production of the low-carbon olefin.

The invention provides modified Y zeolite and a preparation method thereof. The modified Y zeolite contains 1-15 wt% of IVB family metal according to oxide and 0.1-10.0 wt% of phosphorus according to P. The ratio of the content of metal on the surface of the zeolite to the content of metal in the zeolite is not higher than 0.2. The preparation method of the modified Y zeolite includes the steps of processing Y zeolite with water content not exceeding 5 wt% through organic solvent and modified metallic compound, conducting calcinating, and then conducting processing through a phosphorous containing compound and acid. The modified Y zeolite has heat and hydrothermal stability not lower than that of the rare earth modified Y zeolite and has higher coke selectivity.

The invention relates to the field of molecular sieve preparation, and discloses a modification method of a molecular sieve, a modified molecular sieve and an application of the modified molecular sieve. The modification method of the molecular sieve includes the steps of carrying out an ion exchange reaction on a NaY molecular sieve, carrying out hydrothermal superstability treatment, carrying out roasting, carrying out a gas-phase chemical dealumination and silicon supplementation reaction and carrying out gas-solid separation. The hydrothermal superstability treatment and roasting method make the temperature of the roasted molecule sieve be 350-600 DEG C, and the solid content not less than 98% by weight. The modification method provided by the invention has simple process flow, greatlyreduces the production energy consumption of high-silicon molecular sieves, and the prepared modified molecular sieve has high crystallinity and secondary pore structure, as well as high thermal andhydrothermal stability.

The invention discloses a high-stability modified Y-type molecular sieve for high production of isomerized C4 and a preparation method of the high-stability modified Y-type molecular sieve. The CaO content of the modified Y-type molecular sieve is 0.3-4 wt%, the RE2O3 content is 2 to 7 wt%; the content of Na2O is 0.1 to 0.5 wt%; the total pore volume is 0.33 mL/g to 0.39 mL/g; the pore volume of the secondary pores of 2-100nm accounts for 10-25% of the total pore volume; the lattice constant is 2.440-2.455 nm, the content of non-framework aluminum accounts for not more than 20% of the total aluminum content, the lattice collapse temperature is not lower than 1050 DEG C, and the ratio of the amount of acid B to the amount of acid L measured by a pyridine adsorption infrared method at 200 DEG C is not lower than 2.30. The preparation method comprises the steps of ion exchange, modification treatment under certain temperature and water vapor conditions and reaction with silicon tetrachloride. The modified Y-type molecular sieve has higher heavy oil conversion activity, lower coke selectivity, higher gasoline yield and isomeric C4 yield, and higher isomeric hydrocarbon content in gasoline.

One embodiment of the invention provides a modified Y-type molecular sieve and a preparation method thereof, wherein the modified Y-type molecular sieve comprises 4-11 wt% of rare earth (calculated asrare earth oxide), not more than 0.7 wt% of sodium (calculated as sodium oxide), 0.5-5 wt% of zinc (calculated as zinc oxide), and 0.05-10 wt% of phosphorus (calculated as phosphorus pentoxide), theskeleton silicon-alumina ratio is 7-14 based on SiO2/Al2O3 molar ratio, the mass of the non-skeleton aluminum accounts for not more than 20% of the total aluminum mass, and the pore volume of secondary pores with a pore size of 2-100 nm accounts for 15-30% of the total pore volume. According to the invention, the modified Y-type molecular sieve contains phosphorus, rare earth and zinc modificationcomponents, has advantages of high crystallinity, high thermal stability, high hydrothermal stability and rich secondary pores, is used for catalytic cracking of hydrogenated LCO (light cycle oil), and has advantages of low coke selectivity and high conversion efficiency of reactants.

The invention provides a catalytic cracking catalyst. The catalytic cracking catalyst contains clay, an alumina binder and a modified Y type molecular sieve. The modified Y type molecular sieve comprises 5 to 12 wt% of rare earth and no more than 0.5 wt% of sodium oxide, and has a total pore volume of 0.36 to 0.48 mL/g; the pore volume of secondary pores accounts for 20 to 38% of the total pore volume; a lattice constant is 2.440 nm to 2.455 nm; the content of non-framework aluminum is no more than 10% of total aluminum content; lattice collapse temperature is higher than 1060 DEG C; and a ratio of the amount of acid B to the amount of acid L is no less than 3.50. A preparation method for the catalytic cracking catalyst comprises the following steps: preparing a rare earth-containing Y type molecular sieve with a conventional cell size; carrying out roasting in a water vapor atmosphere with a temperature of 350 to 520 DEG C and a volume percentage of 30 to 95% for 4.5 to 7 h; carryingout a contact reaction with silicon tetrachloride; and carrying out acid treatment. The catalyst has higher heavy oil conversion activity, low coke selectivity, and higher gasoline yield, liquefied gas yield, light oil yield and total liquid yield.