30results about How to "High crystal retention" patented technology

The invention relates to a modifying method for Y molecular sieve, which comprises: using industrial NaY molecular sieve as material for ammonium exchange, baking deeply; then, adding surfactant during dealumination with acid. This invention obtains HY molecular sieve with high SiO2/Al2O3(9~15) and crystallinity, improves secondary pores and acid structure compared with the industrial NaY, and fits to be carrier for hydrotreating catalyst for heavy distilled oil.

The invention provides a synthetic method for NaY zeolite with a high silica-alumina ratio. The method comprises the main steps: according to the proportioning requirement of a directing agent to uniformly mix a silicon source, an aluminium source and water, and ageing at 15 DEG C-60 DEG C for 0.5-120 h, so as to prepare the directing agent; according to the proportioning requirement of a gel reaction mixture to adding the directing agent and an alkaline solution into a silicone source at 10 DEG C-90 DEG C, stirring for 1 h-80 h, and stirring uniformly to obtain the gel reaction mixture; performing crystallization on the gel reaction mixture at 80-120 DEG C for 10-50 h, and then filtering, washing and drying to prepare NaY zeolite. The method does not employ a template, the preparation of the directing agent is mild in temperature, NaY zeolite with high crystallization degree and the high silica-alumina ratio is synthesized at a relatively short crystallization time. Also the method is capable of replacing conventional production technology without changing current apparatuses for industrial production, and has great important meaning on improving performances of catalytic cracking catalysts.

The invention relates to a catalytic cracking catalyst and a preparation method. The catalytic cracking catalyst contains a cracking activity component, clay and an adhesive, wherein the cracking activity component a first Y-type molecular sieve, a second Y-type molecular sieve and a third Y-type molecular sieve; the first Y-type molecular sieve is a rare-earth Y-type molecular sieve, the rare-earth content in the first Y-type molecular sieve is 10-25 wt% on the basis of rare-earth oxides, the cell constant is 2.440-2.472nm, the crystallinity is 35-65%, the silicon/aluminum atomic ratio in the framework is 2.5-5.0, and the product of the ratio (I1/I2) of 2theta=11.8+/-0.1 degree peak intensity I1 to 2theta=12.3+/-0.1 degree peak intensity I2 in an X-ray diffraction pattern and the rare-earth weight percent in the molecular sieve on the basis of rare-earth oxides is greater than 50; the second Y-type molecular sieve is a rare-earth-containing gas-phase overstable Y-type molecular sieve; and the third Y-type molecular sieve is a rare-earth-containing DASY molecular sieve. The preparation method comprises the following steps: preparing a slurry containing the cracking activity component, adhesive and clay, and carrying out spray drying. The catalyst has higher conversion rate and gasoline yield, and can reduce the consumption of the molecular sieves, thereby lowering the cost.

The present invention relates to a modified Y molecular sieve having regular mesopore-micropore, and a preparation method thereof, wherein the molar ratio of the skeleton SiO2/Al2O3 of the modified Ymolecular sieve is 5.0-6.0, the specific surface area of the mircopore is 400-600 m<2>/g, the pore volume of the micropore is 0.25-0.35 cm<3>/g, the specific surface area of the mesopore is 30-200 m<2>/g, the pore volume of the mesopore is 0.07-0.85 cm<3>/g, the pore size of the mesopore is 2.0-6.0 nm, and based on the total weight of the modified Y molecular sieve, the sodium oxide content in themodified Y molecular sieve is not more than 0.1 wt%. According to the present invention, the mesopore is introduced while the micropore of the Y molecular sieve is retained, and the mesopore and themicropore have connectivity so as to easily achieve the macromolecule diffusion.

The invention discloses a hydrocracking catalyst carrier and a preparation method thereof. The carrier consists of a small crystal particle Y-shaped molecular sieve and alumina, wherein the small crystal particle Y-shaped molecular sieve has high crystallinity, high ratio of silicate to aluminium, continuous and stable framework structure and smooth pores. A hydrocracking catalyst prepared from the carrier has the characteristics of high catalytic activity, high heavy naphtha selectivity, high potential aromatic hydrocarbon content, low bureau of mines correlation index (BMCI) value of hydrocracking tail oil and the like.

The present invention relates to a method for removing organic amine from beta-zeolite. It is aimed at mainly resolving the problems of previous techniques which are complex in operation and unsafe of whose zeolite skeleton aluminium is easy to lose. Said invention utilzies the adoption of direct four-stage roasting technical scheme in the air atmosphere so as to better resolve the above-mentioned problems. Said four-stage roasting process is as follows: first stage, roasting for 0.5-4.0 hr. at 110-180 deg.C; second stage, roasting for 1.0-6.0 hr. at 230-300 deg.C; third stage, roasting for 0.5-6.0 hr at 360-430 deg.C and fourth stage, roasting for 2.0-10.0 hr. at 530-580 deg.C.

The invention discloses a phosphorus modified ZSM-5 molecular sieve. In 27Al MAS-NMR, the ratio of the resonance signal peak area with the chemical shift of 39 +/- 3 ppm to the resonance signal peak area with the chemical shift of 54 +/- 3 ppm is greater than or equal to 1. The phosphorus-modified ZSM-5 molecular sieve is prepared by carrying out phosphorus modification treatment on a hydrogen type ZSM-5 molecular sieve by adopting a phosphorus-containing compound solution through an impregnation method; and carrying out hydrothermal roasting treatment under the atmosphere environment of externally applying pressure and externally adding water. Phosphorus in the molecular sieve is fully coordinated with framework aluminum, and the framework aluminum is fully protected, so that the molecular sieve has good hydrothermal and active stability and meanwhile has more excellent cracking conversion rate and higher low-carbon olefin yield.

The invention provides a preparation method of a catalyst containing a Y-type molecular sieve, the catalyst is obtained by mixing, kneading, extruding and rolling mixed slurry of the Y-type molecular sieve, alumina sol, pseudo-boehmite, silica sol, clay, acid and water, the Y-type molecular sieve is an NH4Y molecular sieve prepared by carrying out ammonium exchange treatment on a NaY molecular sieve, and the NH4Y molecular sieve is a Y-type molecular sieve prepared by carrying out ammonium exchange treatment on the NH4Y molecular sieve. And contacting the obtained NH4Y molecular sieve with a salt solution containing alkali metal ions and/or a salt solution containing alkaline earth metal ions, filtering, washing, drying, carrying out hydrothermal aging on the obtained product, contacting with an acid solution, and recovering the product, wherein the alkali metal is selected from rubidium and cesium, and the alkaline earth metal is selected from strontium and barium.

The invention discloses a hydrocracking catalyst and a preparation method thereof. The catalyst comprises hydrogenation activity metals and a carrier consisting of a modified small crystal particle Y-shaped molecular sieve and alumina, wherein the small crystal particle Y-shaped molecular sieve has the following properties: the SiO2/Al2O3 molar ratio is 10.0-120.0, the average diameter of the crystal particles is 100-700nm, the cell parameter is 2.436-2.445nm, sodium oxide is less than or equal to 0.1 weight percent, and the crystal retention rate is over 95 percent. The hydrocracking catalyst has the characteristics of high catalytic activity, high heavy naphtha selectivity, high potential aromatic hydrocarbon content, low bureau of mines correlation index (BMCI) value of hydrocracking tail oil and the like.

The invention provides phosphorus-containing faujasite and a preparation method thereof. The preparation method comprises the following step: carrying out a gas-solid phase reaction on dried sodium faujasite and mixed gas of silicon tetrachloride and phosphorus trichloride to obtain the phosphorus-containing faujasite. According to the phosphorus-containing faujasite prepared by the preparation method of the phosphorus-containing faujasite, phosphorus enters a zeolite framework, and the phosphorus-containing faujasite has the characteristics of high B acid content, high stability, high crystallinity, high silica-alumina ratio and low sodium content.

A nitrogen-contained zeolite used as the active component of catalyst for catalytic cracking is a crystallized silicoaluminate containing nitrogen (0.01-5 wt%), and is prepared through mixing the ammonium nitrate with the zeolite chosen from Y zeolite, mordenite and ZSM-5 zeolite and heating at 50-600 deg.C for 0.1-15 hr. Its advantages are high thermal stability, activity and selectivity, and good crystal retention.