62 results about "Ferrierite" patented technology

Provided is a method for preparing methyl acetate by dimethyl ether carbonylation, comprising passing a feed gas including dimethyl ether, carbon monoxide and optional hydrogen through a reactor filled with a mordenite and / or ferrierite molecular sieve based catalyst and reacting at a reaction temperature of 190-320°C, a reaction pressure of 0.5-20.0 MPa and a gas space velocity of 500-5000 h-1 so as to prepare methyl acetate, wherein the molar ratio of dimethyl ether to carbon monoxide is DME / CO=1 / 1-1 / 15, the molar ratio of hydrogen to carbon monoxide is H2 / CO=0-10 / 1, and the feed gas is distributed into each catalyst bed layer in a segmental feeding manner. A feed gas including dimethyl ether and carbon monoxide is uniformly distributed into each catalyst bed layer via a gas distributor, in a segmental feeding manner, which can remarkably improve the conversion rate of dimethyl ether, effectively control or adjust the temperature distribution of a catalyst bed layer, avoid the appearance of a hot spot, and prolong the service life of a catalyst.

Compositions for reduction of NOx generated during a catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise a fluid catalytic cracking catalyst composition, preferably containing a Y-type zeolite, and a particulate NOx reduction composition containing ferrierite zeolite particles. Preferably, the NOx reduction composition contains ferrierite zeolite particles bound with an inorganic binder. In the alternative, the ferrierite zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. NOx reduction compositions in accordance with the invention are very effective for the reduction of NOx emissions released from the regenerator of a fluid catalytic cracking unit operating under FCC process conditions without a substantial change in conversion or yield of cracked products. Processes for the use of the compositions are also disclosed.

A catalyst and a method for selectively reducing nitrogen oxides (“NOx”) with ammonia are provided. The catalyst includes a first component comprising a zeolite or mixture of zeolites selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-18, ZSM-23, MCM-zeolites, mordenite, faujasite, ferrierite, zeolite beta, and mixtures thereof; a second component comprising at least one member selected from the group consisting of cerium, iron, copper, gallium, manganese, chromium, cobalt, molybdenum, tin, rhenium, tantalum, osmium, barium, boron, calcium, strontium, potassium, vanadium, nickel, tungsten, an actinide, mixtures of actinides, a lanthanide, mixtures of lanthanides, and mixtures thereof; optionally an oxygen storage material and optionally an inorganic oxide. The catalyst selectively reduces nitrogen oxides to nitrogen with ammonia at high temperatures. The catalyst has high hydrothermal stability. The catalyst has high activity for conversion of low levels of nitrogen oxides in exhaust streams. The catalyst and the method may have special application to selective reduction of nitrogen oxides in exhaust gas from gas turbines and gas engines, although the catalyst and the method have broad application to a wide range of gas streams that have excess oxygen and high temperatures. The temperature of exhaust gas from gas turbines and gas engines is high. Both the high temperature and the low levels of inlet NOx are challenging for selective catalytic reduction (SCR) catalysts.

Compositions for reduction of NOx generated during a catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise a fluid catalytic cracking catalyst composition, preferably containing a Y-type zeolite, and a particulate NOx composition containing ferrierite zeolite particles. Preferably, the NOx reduction composition contains ferrierite zeolite particles bound with an inorganic binder. In the alternative, the ferrierite zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. NOx reduction compositions in accordance with the invention are very effective for the reduction of NOx emissions released from the regenerator of a fluid catalytic cracking unit operating under FCC process conditions without a substantial change in conversion or yield of cracked products, e.g., gasoline and light olefins. Processes for the use of the compositions are also disclosed.

The invention discloses a preparation method for a nanometer flaky ferrierite molecular sieve. The preparation method is characterized by comprising the following steps: mixing an inorganic silicon source, an aluminum source and an alkali source with pyridine, piperidine, piperazine, tetrahydrofuran or hexylenediamine; then introducing cetyl trimethyl ammonium bromide (CTABr) and carrying out stirring at room temperature for 1 to 3 h; then carrying out a crystallization reaction at 120 to 180 DEG C for 2 and 10 d; and after completion of the reaction, carrying out filtering and drying so as to obtain the nanometer flaky ferrierite molecular sieve. Compared with the prior art, the nanometer flaky ferrierite molecular sieve prepared in the invention has a great outer specific surface area, a high accumulation mesopore volume as high as 0.88 ml / g and a flake thickness of less than 10 nanometers; and the preparation method has the advantages of easiness, mild reaction conditions, a wide synthesis phase, capacity of preparing pure-phase ferrierite in a wide range of a silica-alumina ratio, high yield of ferrierite, certain industrialization prospects and substantial economic values.

The invention provides a boron-modified ferrierite molecular sieve catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding an alkali source, an aluminum source and a boron source into water, and stirring to form a uniform solution; adding a ferrierite molecular sieve seed crystal, a silicon source and a template agent into the uniform solution, and stirring until a sol solution is formed; crystallizing the sol solution under a hydrothermal condition, and carrying out filtration, drying and roasting, so as to obtain boron-modified sodium-type ferrierite molecular sieve raw powder; carrying out ion exchange on the boron-modified sodium-type ferrierite molecular sieve raw powder and an ammonium salt water solution or diluted hydrochloric acid, filtering, and drying, so as to obtain hydrogen-type molecular sieve raw powder; and mixing the hydrogen-type molecular sieve raw powder with a binder and water, carrying out extrusion formation, drying, and roasting, so as to obtain the boron-modified ferrierite molecular sieve catalyst. The boron-modified ferrierite molecular sieve catalyst prepared by virtue of the preparation method has the advantages of high activity, long single pass life, strong anti-carbon property and low liquid phase yield.

A process for preparing the magnesium-alkali zeolite (FER) by vapor phase transfer (VPT) method includes such steps as preparing the gel from the mixture of alkali metal, oxide of. 3-valence element, oxide of 4-valence element and water, dewatering to obtain dried gel, and self crystallizing in Teflon / water vapor at 100-200 deg.C.

The invention discloses hierarchical pore nano ferrierite aggregate, characterized in that a sample of the aggregate has high degree of crystallinity; a molar ratio of SiO2 to Al2O3 is 100-1500; the particle size of particles forming the aggregate is 10-100nm; the mesoporous surface area reaches 70 square meters per gram; the mesoporous bulk volume reaches 0.12ml per gram; and the degree of crystallinity reaches 108% and is not lower than 105%. The invention further relates to a preparation method of the hierarchical pore nano ferrierite aggregate.

The present invention relates to a fluid cracking catalyst and a method for reducing the discharge amount of NOx in the fluid cracking period. The catalyst composition comprises the following components: (a) an FCC cracking component which is suitable for catalyzing the cracking of hydrocarbon under FCC condition, and (b) granular composition for reducing NOx. The granular composition for reducing NOx has an average particle size larger than 45 micrometer and comprises the following components: (i) at least 10 percent of ferrierite by weight and (ii) inorganic binder which accounts for about 5-50 percent by weight. The inorganic binder is selected from aluminum oxide, silicon dioxide, aluminum oxide-silicon dioxide, aluminum phosphate and the mixture thereof. The method of the invention comprises a step of contacting the raw material of hydrocarbon with the cracking catalyst composition in a raising temperature thereby forming the hydrocarbon component with low molecular weight.

There is disclosed a highly crystalline, small crystal, ferrierite zeolite prepared from a gel containing a source of silica, alumina, alkali metal and a combination of two templating agents. The resulting material includes ferrierite crystals having a particle size of about or less than about 200 nm. The desired crystal size can be achieved by using a specific composition of the gel. The purity of the material and the crystal size was determined by using X-ray powder diffraction and scanning electron microscopy. The material has excellent surface area and micropore volume as determined by nitrogen adsorption.

The invention provides ferrierite with a high silica-alumina ratio and a preparation method and application thereof. The preparation method comprises the steps that a silicon source and an alkali metal hydroxide solution are mixed and subjected to constant-temperature treatment for 0.5-8 h at the temperature of 20-100 DEG C, silicon source mother liquor is obtained, and the average particle size of the silicon source mother liquor is 5-100 nm; water, an aluminum source, a template agent and the silicon source mother liquor are mixed to prepare silicon-aluminum gel; and the silica-alumina gel is crystallized at 140-200 DEG C for 1-5 days, and the crystallized product is washed, dried and roasted to obtain ferrierite. The ferrierite obtained by the preparation method has high crystallinity,solid yield and silica-alumina ratio and can be used for catalyzing olefin oligomerization and n-butene and n-pentene skeletal isomerization reaction.

Compositions for reduction of NOx generated during a catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise a fluid catalytic cracking catalyst composition, preferably containing a Y-type zeolite, and a particulate NOx reduction composition containing ferrierite zeolite particles. Preferably, the NOx reduction composition contains ferrierite zeolite particles bound with an inorganic binder. In the alternative, the ferrierite zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. NOx reduction compositions in accordance with the invention are very effective for the reduction of NOx emissions released from the regenerator of a fluid catalytic cracking unit operating under FCC process conditions without a substantial change in conversion or yield of cracked products. Processes for the use of the compositions are also disclosed.

A carbon monoxide selective oxidizing catalyst includes a carrier of ferrierite or ZSM-5 that supports a metal component of platinum (Pt) alone or platinum and at least one type of transition metal. Alternatively, a carbon monoxide selective oxidizing catalyst includes a carrier whose maximum pore diameter ranges from 0.55 to 0.65 nanometers (nm) that supports a metal component of platinum (Pt) alone or platinum and at least one type of transition metal.

A process for producing a composition having a ratio by weight of C10-C26 monobranched fatty acids or alkyl esters thereof to C10-C26 polybranched fatty acids or alkyl esters thereof of greater than 6 using a zeolite, preferably ferrierite, isomerisation catalyst. The zeolite catalyst is preferably the only isomerisation catalyst used. The zeolite catalyst can be reused many times after simple separation from the reaction products without having to be regenerated.