90results about "Galloaluminosilicates/ferroaluminosilicates" patented technology

A catalyst composition includes a heterobimetallic zeolite characterized by a chabazite structure loaded with copper ions and at least one trivalent metal ion other than Al³⁺. The catalyst composition decreases NO_x emissions in diesel exhaust and is suitable for operation in a catalytic converter.

This disclosure relates to new crystalline microporous solids (including silicate- and aluminosilicate-based solids), the compositions comprising 8 and 10 membered inorganic rings, particularly those having HEU topologies having a range of Si:Al ratios, methods of preparing these and known crystalline microporous solids using certain quaternized imidazolium cation structuring agents.

The invention belongs to the technical field of molecular sieves and preparation methods thereof, and particularly relates to a technique for preparing an Fe-ZSM-5 molecular sieve. According to the method, natural mineral diatomite is used as the raw material to provide all of the silicon source, aluminum source and iron source required by synthesis of Fe-ZSM-5, and conventional hydrothermal crystallization is carried out under the condition of not adding any organic template. The natural mineral diatomite is used as the raw material to provide all the silicon and aluminum sources required by the synthesis of the molecular sieve, the Fe2O3 impurity contained in the diatomite raw material is fully utilized as the iron source, and a conventional hydrothermal process is carried out under the condition of not adding any organic template, thereby preparing the framework-iron-containing ZSM-5 molecular sieve (Fe-ZSM-5 molecular sieve). The method has obvious advantages in the aspects of widening the molecular sieve synthesis raw material range, enhancing the added value of the natural mineral product, lowering the molecular sieve production cost, reducing the environmental pollution and the like.

An iron-zeolite chabazite (CHA) catalyst is provided as an SCR catalyst for reducing nitrogen oxides (NO_x) from vehicle engine exhausts. The catalyst is formed by incorporating iron during synthesis of the chabazite zeolite, which eliminates the need for a post-synthesis ion-exchange step and which results in the incorporation of iron into the (CHA) zeolite crystal lattice structure. The resulting catalyst exhibits good high temperature activity at temperatures greater than 550° C. and exhibits good thermal stability.

Microporous and mesoporous metal silicates are prepared by the hydrothermal reaction of a silicon and metal source in the presence of a template. The choice of raw materials influences the purity and hence the catalytic activity of the products. A pyrogenic mixed oxide is used as the silicon and metal source. Prepared products have the composition (SiO2)1-x(AmOn)x, where A is Ti, Al, B, V or Zr and x is 0.005 to 0.1. Shaped objects of the microporous and mesoporous metal silicates are obtained directly by using a shaped object of the pyrogenic mixed oxide. The products obtained are used as oxidation catalysts.

A process is described of producing an MTT framework type molecular sieve by crystallizing a mixture capable of forming said molecular sieve, wherein the mixture comprises sources of alkali or alkaline earth metal (M), an oxide of trivalent element (X), an oxide of tetravalent element (Y), water and a directing agent (R) of the formula (CH₃)₃N⁺CH₂CH₂CH₂N⁺(CH₃)₂CH₂CH₂CH₂N⁺(CH₃)₃, and has a composition, in terms of mole ratios, within the following ranges.

• • YO₂/X₂O₃ less than 45
  • H₂O/YO₂ 5 to 100
  • OH⁻/YO₂ 0.05 to 0.5
  • M/YO₂ 0.05 to 0.5 and
  • R/YO₂>0 to <0.5.

A desulfurization adsorbent for a fuel cell has a structure according to Formula 1 below, and a desulfurizing method uses the desulfurization adsorbent. The desulfurization adsorbent displays remarkably excellent adsorption performance for adsorbing sulfur compounds as well as excellent regeneration performance, compared with conventional desulfurization adsorbents. Thus, the desulfurization adsorbent does not need to be replaced even after prolonged use, thus stabilizing the operation of a fuel cell system and reducing costs.

(M₁)_a-(Si)_x—(Ti)_y-(M₂)_z-O   [Formula 1]

wherein M₁ is at least one selected from alkali metals, alkaline earth metals, hydrogen, ammonium, rare earths, and transition metals; 4≦x/y≦500, 0≦z/y≦3, 0≦a/(y+z)≦1; and M₂ is aluminum (Al), boron (B) or a trivalent metal. The desulfurizastion adsorbent is produced by subjecting a mixture of a silicon source, a titanium source, and optionally, aluminum, boron or a trivalent metal in an alkali solution to a hydrothermal treatment to obtain a crystalline porous molecular sieve.

A molecular sieve has a silica/alumina molar ratio of 100-300, and has a mesopore structure. One closed hysteresis loop appears in the range of P/P₀=0.4-0.99 in the low temperature nitrogen gas adsorption-desorption curve, and the starting location of the closed hysteresis loop is in the range of P/P₀=0.4-0.7. The catalyst formed from the molecular sieve as a solid acid not only has a good capacity of isomerization to reduce the freezing point, but also can produce a high yield of the product with a lower pour point. The process for preparing the catalyst involves steps including crystallization, filtration, calcination, and hydrothermal treatment.

Provided is a method for producing aromatic hydrocarbons, by which a feedstock containing a hydrogenation-treated oil of a thermally cracked heavy oil obtainable from an ethylene production apparatus is brought into contact with a catalyst for monocyclic aromatic hydrocarbon production containing a crystalline aluminosilicate, and thereby aromatic hydrocarbons are produced. A raw material having an end point of the distillation characteristics of 400° C. or lower is used as the feedstock. The contact between the feedstock and the catalyst for monocyclic aromatic hydrocarbon production is carried out at a pressure of 0.1 MPaG to 1.5 MPaG.

Embodiments of the invention relate to methods for making and compositions including zeolite with an impregnated titanium dioxide. Such zeolite/titanium dioxide compositions may be useful, for example, as a substitute or extender for titanium dioxide used in coatings.

The present invention relates to new methods of making crystalline materials, as well as to new crystalline materials obtainable by such methods, and their use in hydrocarbon conversion processes. In one of its aspects, the invention relates to a method for preparing a crystalline molecular sieve comprising oxides of one or more tetravalent element(s), optionally one or more trivalent element(s), and optionally one or more pentavalent element(s), said method comprising submitting to crystallization conditions one or more sources of said oxides in the presence of at least one organic templating agent R of formula C¹C²R¹R²N⁺ A⁻ (I), in which

• • C¹ and C² each independently represent a substituted or unsubstituted cyclohexyl or cyclopentyl group,
  • R¹ and R² each independently represent a methyl group, an ethyl group or a propyl group, or R¹ and R² together with the nitrogen atom they are connected to form a ring containing 5 or 6 atoms, and
  • A represents hydroxyl, fluorine, chlorine, bromine or iodine.

Provided are zeolite catalysts that allow reactions to proceed at temperatures as low as possible when lower olefins are produced from hydrocarbon feedstocks with low boiling points such as light naphtha, make it possible to make propylene yield higher than ethylene yield in the production of lower olefins, and have long lifetime.

The zeolite catalysts are used in the production of lower olefins from hydrocarbon feedstocks with low boiling points such as light naphtha. The zeolite catalysts are MFI-type crystalline aluminosilicates containing iron atoms and have molar ratios of iron atoms to total moles of iron atoms and aluminum atoms in the range from 0.4 to 0.7. The use of the zeolite catalysts make it possible to increase propylene yield, to lower reaction temperatures, and to extend catalyst lifetime.

The invention discloses a preparation method of a mesoporous silicon-aluminum molecular sieve adsorbent for VOCs (volatile organic chemicals) treatment. Doping modification is performed by taking acetylacetone as a chelating agent, iron nitrate as an iron source and aluminum isopropoxide as an aluminum source; a synthesis route of synthesizing a mesoporous silicon-aluminum molecular sieve by a sol-gel method is adopted. The mesoporous silicon-aluminum molecular sieve provided by the invention is particularly suitable for an adsorbent for VOCs treatment, and has the advantages of large specific surface area, large pore volume, high adsorption selectivity, high mechanical strength, stable chemical properties, wide source and easy regeneration and reutilization.

The embodiment of the invention relates to the technical field of sound absorbing materials and discloses a sound absorbing material. In the invention, the sound absorbing material comprises an MFI structure molecular sieve; the MFI structure molecular sieve comprises a framework and framework external positive ions; the framework comprises SiO2 and metal oxide MxOy; the Si/M atomic ratio in the framework is at least 100, wherein M comprises gallium; the framework external positive ions are at least one of hydrogen ions, alkaline metal ions or alkaline-earth metals. The invention also providesa preparation method of the sound absorbing material and a loudspeaker applying the sound absorbing material. According to the sound absorbing material, the preparation method and the loudspeaker applying the sound absorbing material, the performance of the loudspeaker can be improved, the molecular scene invalidation is reduced, and the performance stability of the loudspeaker is improved.

A metalloaluminosilicate composition includes an aluminosilicate composition having an aluminosilicate framework and containing at least one metal, wherein a substantial portion of the metal is incorporated into the aluminosilicate framework. A higher concentration of the metal is incorporated into the framework of the catalyst than is present at the surface of the catalyst.