61 results about "Ferrierite" patented technology

A process for dewaxing waxy hydrocarbonaceous materials, such as hydrocarbon fuel and lubricating oil fractions to reduce their cloud and pour points comprises reacting the material with hydrogen in the presence of a dewaxing catalyst comprising at least one metal catalytic component and ferrierite in which at least a portion of its cation exchange positions are occupied by one or more trivalent rare earth metal cations. The rare earth ion exchanged ferrierite catalyst has good selectivity for lubricating oil production, particularly when dewaxing a Fischer-Tropsch wax hydroisomerate. Preferably at least 10% and more preferably at least 15% of the ferreirite cation exchange capacity is occupied by one or more trivalent rare earth metal cations.

An improved process for producing very high quality base stock and for simultaneous production of high quality middle distallates, comprising successive hydroisomerisation and catalystic dewaxing steps wherein hydroisomerisation is carried out in the presence of a catalyst containing at least one noble metal deposited on an amorphous acidic support, the dispersion of the metal being less than 20%. The support is preferably an amorphous silica-alumina. Catalytic dewaxing is carried out in the presence of a catalyst containing at least one hydrodehydrogenating element (group VIII) and at least one molecular sieve (preferably zeolite). The sieve is preferable selected from NU-10, EU-1, EU-13, zeolite and ferrierite.

A catalyst and a method for selectively reducing nitrogen oxides (“NO_x”) 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 NO_x are challenging for selective catalytic reduction (SCR) catalysts.

A mixed-bed catalytic system and its activation for direct synthesis of dimethyl ether from synthesis gas are described, comprising a catalyst for methanol synthesis and the zeolite ferrierite in its acid form as the methanol dehydrating component, the two being mixed physically in the form of powder of defined granulometry or as pellets. Another object of the present invention is a process for production of the acid form of the zeolite ferrierite. Another object of the present invention is a process for direct synthesis of dimethyl ether from a synthesis gas, using the catalytic system of the present invention.

SCR-active molecular sieve based-catalysts are produced by combining a molecular sieve with at least one ionic iron species and at least one organic compound to form a mixture, then calcining the mixture to remove the at least one organic compound. This process improves the dispersion of the iron within the molecular sieve compared to an iron-containing molecular sieve that is not treated with an organic compound. Iron-containing ferrierite zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH₃ or urea of greater than 25% conversion at 300° C. in exhaust gases prior to ageing or exposure to steam. Iron-containing beta zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH₃ or urea of: (a) greater than 40% conversion at 300° C. and (b) greater than 80% conversion at 400° C., in exhaust gases after ageing for 20 hours at 700° C. in the presence of 10% H₂O.

The invention relates to a Fe molecular sieve SCR (Selective Catalytic Reduction) catalyst for purifying NOx in acrylonitrile oxidization tail gas and a preparation method of the Fe molecular sieve SCR catalyst. A commercial ZSM-5 molecular sieve, a Y type molecular sieve, ferrierite or a beta molecular sieve is used as a carrier, 0.3-10.0 percent by mass of Fe<3+> is introduced to be used as an active component by adopting an immersion method or ion exchange method, and 0.5-8.0 percent by mass of M (lanthanum La or cobalt Co) is introduced to be used as a modification component. The SCR catalyst prepared by adopting the preparation method furthest realizes NO transformation and efficient catalysis removal of the NOx in the acrylonitrile oxidization tail gas under an oxygen enrichment condition. The preparation method provided by the invention has the advantages of simple process and good repeatability, and is beneficial to industrialized production.

The invention discloses a catalyst for preparing iso-olefins by isomerizing straight-chain olefins and a preparation method of the catalyst. The catalyst uses the FER (ferrierite) zeolite raw powder as a main active body, wherein the silica-alumina ratio (SiO2/Al2O3) (molar ratio) is less than 50. The preparation method comprises the following steps: mixing FER zeolite raw powder, silica sol and/or alumina sol, organic acid and water evenly; carrying out molding, drying and calcinaton, and soaking in a VIII group metal oxide solution; and carrying out drying and calcination to obtain the catalyst. For the isomerization of straight-chain olefins, the catalyst is good in activity and stability, high in both conversion rate of straight-chain olefins and selectivity to iso-olefins and can be applied to the field of industrial production of the iso-olefins, such as the industrial production of isobutene and isoamylene.

The invention discloses sodium-potassium-hydrogen type ferrierite and a method for preparing the same. The sodium-potassium-hydrogen type ferrierite comprises 0.02%-0.1wt% of Na2O, 1.0%-5.0wt% of K2O, wherein the molar ratio of SiO2 to Al2O3 is 8-50. The method adopts a sodium-potassium-hydrogen type ferrierite partial ammonium exchange method. The method comprises that the sodium-potassium-hydrogen type ferrierite and an inorganic ammonium salt water solution with a certain concentration are pulped uniformly, and the exchanged pulp is filtered, eluted, dried and calcinated. After the method is adopted, the pH value of the exchange fluid does not need to be adjusted, the concentration of the inorganic ammonium salt water solution only needs to be changed, and the sodium-potassium-hydrogen type ferrierite with an appropriate total alkali metal content can be obtained through one or two times of exchange at room temperature and has good usability in straight-chain olefin isomerization reaction.

The invention discloses a synthesis method of a small-crystal-grain FER (Ferrierite) molecular sieve with a laminar stacking structure. The synthesis method comprises the following steps: taking a silicon source, an aluminum source, alkali, an organic template agent and water as raw materials, and rotating and ageing at relatively low temperature to form initial gel; then carrying out dynamic crystallization to obtain a primary product; then removing the organic template agent under a mild condition by utilizing a lot of low-temperature plasmas generated through a dielectric barrier discharge(DBD) device, so as to obtain the small-crystal-grain FER molecular sieve with the laminar stacking structure; finally, carrying out different depths of water stream coupled low-temperature plasma treatment on the prepared molecular sieve, so as to remove framework aluminum and adjust the acidic ratio of the FER molecular sieve, and further modify the shape and structure of the molecular sieve. The molecular sieve prepared by the invention not only has good stability, but also has a very strong carbon deposition resisting capability; when the molecular sieve is used for catalyzing n-butene isomerization reaction, excellent performance is obtained, and the stability of a catalyst is effectively enhanced; the service life of the catalyst is extremely improved.

The invention provides a catalyst used for heterogeneously producing isoalkene by utilizing a direct-chain olefin skeleton. The catalyst comprises an FER zeolite and a binder, wherein the FER zeolite is a sodium potassium hydrogen type FER zeolite, and based on the percentage by weight of zeolite, Na2O content is 0.02-0.1%, K2O content is 1.0-5.0%, and mole ratio of SiO2 to Al2O3 is 8-50. The catalyst provided by the invention is obtained by fully mixing the FER zeolite powder, the binder, sesbania powder, inorganic acid and water, moulding the obtained mixture and then drying and roasting. The ferrierite adopted by the invention is of a sodium potassium hydrogen type, and the catalyst prepared by the method provided by the invention has isoalkene selectivity compared with the hydrogen type FER zeolite containing no sodium or/and potassium.

The invention discloses a modified ferrierite as well as a preparation method and application thereof. The modified ferrierite is prepared from the following component in percentage by weight: 0.02-0.1% of Na2O, 1.0-5.0% of K2O and 0.05-0.5% of SiO2 in silicon introduced for surface silanization, wherein the molar ratio of the SiO2 to the Al2O3 in the modified ferrierite is 8-50. The modified ferrierite is prepared by exchanging sodium-potassium ferrierite by ammonium partially to obtain sodium-potassium-hydrogen ferrierite and silanizing the surface of the sodium-potassium-hydrogen ferrierite. Due to the adoption of the preparation method, the number of hydroxyls and acid sites on the outer surface of the ferrierite can be reduced effectively. The silanized and modified ferrierite has good use performance in the straight-chain olefin isomerization reaction.

The invention discloses a hollow cerium dioxide microsphere supported ferrihydrite heterogeneous Fenton-like catalyst and a preparation method and application thereof. The preparation method of the hollow cerium dioxide microsphere supported ferrierite heterogeneous Fenton-like catalyst comprises the following steps: firstly, preparing porous cerium dioxide nanospheres by using Saccharomyces cerevisiae as a biological template in a high-temperature environment; and then, loading the porous cerium dioxide nanospheres on the surface of ferrierite by in-situ deposition. The mesoporous ceria nanospheres in the catalyst have a photosensitive effect, can generate photo-generated carriers in response to visible light, and promote the activation efficiency of the ferrihydrite on hydrogen peroxide in a Fenton system. Generated active free groups have broad-spectrum catalytic degradation effect on pollutants and have certain practical application value.

The invention discloses an isomerization method for n-butene. The method comprises the steps of: under an isomerization condition, performing a fourth contact on n-butene and an isomerization catalyst, wherein the isomerization catalyst comprises modified ferrierite and the modified ferrierite is obtained by performing a first contact on unmodified ferrierite and an ammonium-containing compound under a solution condition; the ammonium-containing compound comprises ammonium nitrate and ammonium fluosilicate. The isomerization method for n-butene disclosed by the invention can remarkably improve the conversion ratio of a reaction substrate and the selectivity of a product.

The present invention concerns the field of fluid catalytic cracking (FCC) processes. The invention provides a process increasing production of LPG and propene in FCC units operating under conditions of maximisation of middle distillates of low aromaticity, such that they may be incorporated into the diesel oil pool. The invention also relates to the preparation and employment of additives based on zeolites having small pores, such as ferrierite (FER), in catalytic systems for FCC units, wherein conditions of low severity are adopted with a view to increasing yields of LPG and light olefins whilst improving stability of petrol. The invention also provides an original catalytic system, being more efficient than catalytic systems known in the state of the art, to increase the yield of LPG and propene without prejudicing the yield and quality of LCO. Furthermore it provides a method of preparation of an additive for said process employing the zeolite ferrierite.

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 discloses an alkali earth metal modified ferrierite, and a preparation method and application thereof. Based on the weight percent of zeolite, the modified ferrierite comprises 0.1-1.5% of alkali earth metal based on Me<2+>; and the SiO2/Al2O3 mol ratio is 8-50. The modified ferrierite is prepared from hydrogen ferrierite through an alkali earth metal ion exchange method; and the method comprises the following steps: uniformly pulping the hydrogen ferrierite and an alkali earth metal solution, and exchanging at 20-95 DEG C for 1-8 hours, wherein the exchange is performed 1-10 times; and then, filtering the pulp, leaching, drying, and roasting. The modified ferrierite prepared by the method disclosed by the invention can achieve higher isobutylene yield in isobutylene preparation reaction based on n-butylene skeleton isomerization in comparison with unmodified hydrogen ferrierite.