1409results about "Faujasite aluminosilicate zeolite" patented technology

The present invention provides a high silica-alumina ratio small crystal grain NaY molecular sieve. The skeleton silica-alumina ratio of NaY molecular sieve, namely. SiO2/Al2O3 mole ratio is 6.0-7.0, and the average grain size is 300-800 nm. It can be made up by adopting non-template agent direct synthesis process. Its preparation method includes the following steps: firstly, stirring and ageing for 0.5-48 hr at 15-60deg.C to obtain crystallization guide agent, then mixing said guide agent, water, silicon source and aluminium source to obtain reaction mixture, then crystallizing said mixture at twice, first steps is dynamic crystallization and second step is static crystallization, finally, filtering, washing and drying so as to obtain the invented high silica-alumina ratio small crystal grain NaY molecular sieve whose relative crystallinity is greater than 80%.

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.

The invention relates to a method for modifying a USY (Ultra-Stable Y) molecular sieve. The method is characterized in that organic acid and an inorganic salt dealuminizing reagent are simultaneously added in a modifying process for organic acid-inorganic salt combined modification, and optimum process conditions, namely optimum concentration, volume ratio, reaction time, reaction temperature and the like, of an organic acid and an inorganic salt solution are determined by virtue of an orthogonal test. Compared with an industrial USY molecular sieve, the USY molecular sieve obtained by adopting the method disclosed by the invention is obviously increased in secondary pore content, can be kept at higher crystallinity and is enhanced in silica-alumina ratio, reduced in lattice constant and suitable for high-medium oil type hydrocracking catalyst carriers.

The invention discloses a mesoporous Y-type zeolite molecular sieve and a preparation method thereof. The preparation method comprises the following steps of: firstly preparing a Y-type zeolite guiding agent; and then guiding synthesis of the mesoporous Y-type zeolite molecular sieve by using amphiphilic organosilane N,N-dimethyl-N-[3-(trimethoxysilane)propyl]octadecyl ammonium chloride (TPOAC) as a mesoporous template, wherein siloxane group at the organosilane terminal is firstly hydrolyzed into silicon hydroxyl; then the silicon hydroxyl is linked to a skeleton on the zeolite surface through chemical bonds; and other alkyl terminals are polymerized and then participate in pore expansion. According to the method disclosed by the invention, mesoporous zeolites can be synthesized by using a one-step hydrothermal process; the method is simple in preparation process, easy to operate and low in cost and good in connectivity between mesopores and micropores, and facilitates macromolecular diffusion. As the prepared mesoporous zeolite molecular sieve has the mesopores and the micropores, the defect of a single pore structure is avoided; and the mesoporous Y-type zeolite molecular sieve has broad application prospect in the catalytic field, in particular in macromolecular diffusion-limited reaction.

A molecular sieve adsorbent for the purification of gas streams containing water vapor and carbon dioxide and a process for its preparation. The adsorbent is a sodium form of a low-silica faujasite having a silica to alumina ratio of about 1.8:1 to about 2.2:1, a residual content of potassium ions less than about 8.0 percent (equiv.), a low content of crystalline and amorphous admixtures and crystal sizes generally within the range of 1-4 mum, blended with a binder.

The invention discloses microcrystal NaY-type molecular sieves and a preparation method thereof. In the microcrystal NaY-type molecular sieves, the molar ratio of SiO2 to Al2O3 is 4.0 to 6.0, and the average particle size is 100 to 700 nanometers. The microcrystal NaY-type molecular sieves are prepared by a method combining low-temperature synthesis directing agent, low-temperature synthesis gel and two-stage variable-temperature dynamic crystallization. The NaY-type molecular sieves have a relative crystallinity of over 80 percent after being roasted in the air at 600 DEG C for 3 hours or after undergoing hydrothermal treatment with vapor at 650 DEG C for 1 hour, as well as high thermostability and hydrothermal stability.

The present invention relates to the preparation of hyperstable Y-type RE molecular sieve for the catalytic cracking of heavy oil and containnig vanadium resisting component. The preparation uses NaY-type molecular sieve as main material and chemical aluminum-eliminating complex containing oxalic acid and/or oxalate and its mixture and through introducing RE ion in the late stage of chemical aluminum elimination reaction to from RE precipitate and hydrothermal treatment to realize hyperstabilizing and introduce RE ion and independent phase Re oxide. The formed precipitate RE precursor includes RE oxalate. Compared with conventional REY, REHY and REUSY, the molecular sieve preparing process is simple and high in RE utilization, and has homogeneously distributed aluminum, more secondary pores high hydrothermal stability, high activity and high vanadium contamination resisting capacity.

The invention discloses a preparation method of a skeleton silicon-rich Y-shaped molecular sieve, comprising the following steps of: firstly, carrying out desiliconizing pretreatment on a NaY molecular sieve with alkali lye and secondly carrying out ammonium exchange and dealumination and silicon reinsertion on the molecular sieve treated with alkali. The alkali treatment condition is to pulp and evenly mix the NaY molecular sieve and an alkali liquor in the mass ratio of NaY (dry basis): alkali: H2O being (0.1-2): (0.05-2): (4-15) and carry out alkali treatment at 0-120 DEG C for 0.1-24h. Compared with a product obtained by carrying out ammonium exchange and silicon-rich treatment on the NaY molecular sieve, the skeleton silicon-rich Y-shaped molecular sieve subject to the desiliconizing pretreatment has higher infrared acid quantity, B acid quantity and secondary pore content. A catalyst prepared from an active component which is the skeleton silicon-rich Y-shaped molecular sieve prepared by the method has stronger heavy oil transformation capability and higher light oil recovery rate when being used for a heavy oil cracking reaction.

Compositions and methods for making stabilized mesoporous materials. Surfactant-treated mesoporous precursor materials can be heat-treated in the presence of steam and/or ammonia in a heat-treating environment. The steam and/or ammonia can be introduced into the heat-treating environment via in situ and/or ex situ sources. Such stabilized mesoporous materials can have increased structural stability.

The invention discloses a method for preparing the NaY molecular screen of high alumina silica ratio and fine grain, firstly synthesizing NaY molecular screen guilding agent according to current technology, then producing gel with sodium silicate, guilding agent, acid aluminium salt and sodium metaaluminate, blooming the gei under the temperature of 50-100 Deg C for 0-70 hours, adding some silicon, then blooming continuously under temperature of 90-120 Deg C for 0.5-50 hours, finally filtering, washing and drying. The NaY molecular screen with the alumina silica ratio being 5.2-7.0, and fine grain being 100-400 nm can be prepared by using the method in this invention.

The invention relates to a method for preparing a high silicon molecular sieve. The method comprises the following steps: circulating a molecular sieve along with inert carrier air under the carrying of inert carrier air flow and contacting the molecular sieve with gas-phase SiCl4 in a flowing sate, wherein the contact time of the molecular sieve and the gas-phase SiCl4 is from 10 seconds to 100 minutes. By using the method for preparing the high silicon molecular sieve in the invention, the continuous contact reaction of the molecular sieve and the SiCl4 can be achieved, and the contact time of the molecular sieve and the SiCl4 can be controlled through controlling the flow speed of the carrier air and the length of a tubular reactor, thus the contact reaction of the molecular sieve and the SiCl4 can be fully carried out in the tubular reactor.

The present invention provides process of selecting proper hetero atom to modify the skeleton of Y-type molecular sieve and to raise the heat stability and hydrothermal stability of Y-type molecular sieve. The process includes direct hydrothermal crystallizing, adding proper amount of hetero atom to prepare MY-type molecular sieve containing skeleton hetero atom, performing the secondary ion exchange and secondary roasting of MY-type molecular sieve after adding small amount of hetero atom in the same kind to obtain USMY type molecular sieve with very high heat stability and hydrothermal stability. The molecular sieve with very high heat stability and hydrothermal stability is applied in the catalysts for catalytic cracking, hydrogenation cracking, etc of hydrocarbons.

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 discloses a modified Y-zeolite and preparing method with molar rate of SiO2/Al2O3 at 7.0-30, wherein the specific area of Y-zeolite is 700-900m2/g with cell constant at 2.425-2.445nm; the relative crystallizing degree is not less than 80% with Na2O content not more than 0.25%; the 1.7-10nm second hole is over 45% in the total hole capacitance; the non-frame aluminium is over 30% in the whole aluminium with infrared acid degree at 0.15-0.55mmol/g; the preparing method adopts NaY as raw material to produce the modified Y-zeolite through ammonia exchanging, hydrothermal disposal, non-frame aluminium stripping, hole expanding and secondary hydrothermal disposal.

The invention provides a method for preparing a high-hydrothermal-stability mesoporous molecular sieve. The method includes the following steps: (1) preparation of a first Y-type molecular sieve precursor; and (2) crystallization: adding a seed crystal to the first Y-type molecular sieve precursor, adjusting the pH value to 0.5-5, stirring for 10 h-24 h at the temperature of 20 DEG C-50 DEG C, then aging for 2 h-24 h at the temperature of 20 DEG C-50 DEG C, to obtain an assembled product, transferring the assembled product into a microreactor with a polytetrafluoroethylene lining, then transferring together with the reactor into a high-pressure reaction kettle, crystallizing for 10 h-48 h at the temperature of 100 DEG C-200 DEG C, filtering, washing, drying, and thus obtaining the high-stability mesoporous molecular sieve. Firstly, the microporous molecular sieve precursor is prepared, a mesoporous-microporous molecular sieve as the seed crystal is used for preparation of the mesoporous molecular sieve, the molecular sieve precursor assembly method and the seed crystal method are combined, and the high-stability mesoporous molecular sieve is obtained under the condition without use of an organic template agent. Not only is the preparation cost of the molecular sieve reduced greatly, but also the process of calcination of the template agent is omitted so as to reduce the energy consumption.

The invention relates to a preparation method of a mesoporous-containing Y-shaped molecular sieve, and relates to a preparation method of a Y-shaped molecular sieve. The preparation method aims to solve the problems of small pore diameter and pore volume of the Y-shaped molecular sieve prepared through the traditional method. The preparation method comprises the following steps of: 1, preparing a sodium type Y-shaped molecular sieve; 2, preparing an ammonium type Y-shaped molecular sieve; 3, processing through an organic acid water solution; 4, processing through NaOH; and 5, processing through an ammonium nitrate water solution so as to obtain the mesoporous-containing Y-shaped molecular sieve. The mesoporous-containing Y-shaped molecular sieve is synthesized through a simple and effective method under a moderate condition, contains abundant mesoporous, is unchanged in microporosity, achieves the volume of the mesoporous at 0.5-1.5 mL/g, greatly promotes the macromolecule to approach a catalytic active center and is favorable for reaction mass transfer through more concentrated pore diameter distribution, has the advantages of adjustable ratio of silicon and aluminum contained in a framework and good hydrothermal stability and can be used as a catalyst carrier or directly used as a catalyst. The preparation method disclosed by the invention can be used for preparing the mesoporous-containing Y-shaped molecular sieve.

The invention discloses a preparation method of a mesoporous-microporous composite molecular sieve. The preparation method comprises the following steps of adding a microporous molecular sieve subjected to hydrothermal treatment into a mixed system of a silicon source, an acid solution and a surfactant, then carrying out crystallization, filtration and washing, and then carrying out drying and calcination to obtain the mesoporous-microporous composite molecular sieve. The preparation method fully utilizes non-framework aluminum falling from the microporous molecular sieve, avoids an aluminum source used by the conventional molecular sieve preparation technology, is conducive to improvement of a silica-alumina ratio of the mesoporous-microporous composite molecular sieve, realizes a high degree of crystallization, and improves hydrothermal stability and thermostability of the mesoporous-microporous composite molecular sieve. The mesoporous-microporous composite molecular sieve is suitable for the field of macromolecule catalysis, is conducive to improvement of a reaction conversion ratio and reaction selectivity, and is especially suitable for being used in a cracking catalyst for maximum-degree production of middle distillate from heavy oil as a raw material.

The invention provides a Y-type molecular sieve with an ultra-high mesoporous content and a preparation method of the Y-type molecular sieve. The method comprises the following steps: pre-treating Y-type zeolites for 1-5 hours at 300-600 DEG C; cooling to 200-600 DEG C; in an anhydrous drying environment, introducing dry gas saturated by a dealuminating silicon-reinforcing agent into the pre-treated Y-type zeolites and carrying out reaction for 0.5-7 hours to obtain a coarse product; or in the anhydrous dry environment, raising the temperature at a constant speed to 250-700 DEG C, introducing dry gas saturated by the dealuminating silicon-reinforcing agent into the pre-treated Y-type zeolites simultaneously and carrying out reaction for 0.5-7 hours to obtain a coarse product, wherein the introducing speed of the dry gas saturated by the dealuminating silicon-reinforcing agent is 50mL/minute; carrying out acid treatment on the coarse product; and carrying out alkaline treatment on the coarse product after acid treatment to obtain the Y-type molecular sieve. The invention further provides the Y-type molecular sieve with the ultra-high mesoporous content by virtue of the method. The sieve is the Y-type molecular sieve which is high in silica-alumina ratio, wide in range and high in mesoporous content; and the preparation method is simple to operate and low in raw material cost.

The invention relates to a preparation method for a nano-Y-shaped molecular sieve/amorphous silicon-aluminum composite material. According to the method, a guiding agent is synthesized, and a surfactant is added during the guiding agent synthesizing process; a surfactant is added during a preparation and synthesis process of gel of the Y-shaped molecular sieve, and a hydrothermal crystallization method is adopted to synthesize the nano-Y-shaped molecular sieve; an aqueous solution of a mixture is added to the slurry containing the nano-Y-shaped molecular sieve, wherein the mixture comprises water glass and an aluminum source; an acid is added to adjust the pH value to 7-9.5 to form the gel; the gel is washed, dried and baked to obtain the composite material. According to the present invention, the grain of the Y-shaped molecular sieve in the composite material prepared by the method of the present invention is maintained to less than 100 nm, and the composite material of the present invention is suitable for catalytic cracking reactions and hydrocracking reactions of heavy oil macromolecules.

The present invention provides a super-stable Y zeolite and the preparation method thereof. The ratio of silicate to aluminum in the super-stable Y zeolite is 6-11. The lattice constant of the zeolite is 2.446 to 2.458 nanometers. The percentage of non-skeleton aluminum in total aluminum in the zeolite is not higher than 30% by weight. The diameter of secondary pores with diameter of 2 to 100 nanometers in the zeolite shows a double probable distribution. The most probable diameter of the secondary pores with comparatively large diameter is 6-15 nanometers. The proportion of secondary pores with diameter between 8 to 100 nanometers in total secondary pores is 35% to 60%. The preparation method of the zeolite includes the step of making the super-stable Y zeolite come into contact with a solution containing organic acids and inorganic acids in the atmosphere of inert gases and/or nitrogen. The modified super-stable Y zeolite provided in the invention is applied to catalytic cracking; therefore the following effects can be realized: the cracking ability of heavy oil is strong, the selectivity of gasoline is high, and the selectivity of dry gas and carbon coke is good.

The invention relates to a mordenite/beta zeolite/Y zeolite coexisting material and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the mordenite/beta zeolite/Y zeolite coexisting material by adding a seed crystal containing a Y zeolite precursor during a synthesis process of mordenite/beta zeolite/Y zeolite coexisting material. A mole relation of the components of the synthesized mordenite/beta zeolite/Y zeolite coexisting material is nSiO2 :Al2O3, wherein n is between 4 and 400; the XRD diffraction pattern of the mordenite/beta zeolite/Y zeolite coexisting material comprises a technical proposal that a maximum value of a distance d is at positions between 14.52-0.1 and 14.52+0.1 A, 13.52-0.1 and 13.52+0.1 A,11.32-0.1 and 11.32+0.1 A, 8.96-0.1 and 8.96+0.1 A, 6.71-0.1 and 6.71+0.1 A, 5.71-0.1 and 5.71+0.1 A, 4.51-0.05 and 4.51+0.05 A, 4.15-0.05 and 4.15+0.05 A, 3.97-0.05 and 3.97+0.05 A, 3.78-0.05 and 3.78 +0.05 A, 3.51-0.05 and 3.51+0.05 A, 3.02-0.05 and 3.02+0.05 A, and 2.86-0.1 and 2.86+0.1 A; therefore, the problems are solved well. The mordenite/beta zeolite/Y zeolite coexisting material can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.