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7211 results about "Zeolite" patented technology

Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents and catalysts. The term zeolite was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt, who observed that rapidly heating the material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material. Based on this, he called the material zeolite, from the Greek ζέω (zéō), meaning "to boil" and λίθος (líthos), meaning "stone". The classic reference for the field has been Breck's book Zeolite Molecular Sieves: Structure, Chemistry, And Use.

Catalyst for complete oxidation of formaldehyde at room temperature

The invention provides a high selectivity catalyst used for catalyzing and completely oxidizing formaldehyde with low concentration at room temperature. The catalyst can catalyze formaldehyde completely so as to lead the formaldehyde to be converted into carbon dioxide and water at room temperature. In addition, the conversion rate of formaldehyde remains 100% within a long period of time, without complex auxiliary facilities such as light source, a heating oven and the like, and external conditions. The catalyst comprises three parts which are inorganic oxide carrier, noble metal component and auxiliary ingredient. Porous inorganic oxide carrier is one of cerium dioxide, zirconium dioxide, titanium dioxide, aluminium sesquioxide, tin dioxide, silicon dioxide, lanthanum sesquioxide, magnesium oxide and zinc oxide or the mixture thereof or composite oxide thereof, zeolite, sepiolite and porous carbon materials. The noble metal component of the catalyst is at least one of platinum, rhodium, palladium, gold and silver. The auxiliary ingredient is at least one of the alkali metals of lithium, sodium, kalium, rubidium and cesium. The loading of the noble metal component used in the catalyst of the invention is 0.1 to 10% according to weight converter of metal elements and the selective preference is 0.3 to 2%. The loading of the auxiliary ingredient is 0.2 to 30% according to weight converter of metal elements and the selective preference is 1 to 10%. When the loading of the auxiliary ingredient is lower than 0.2% or higher than 30%, the activity of the catalyst for catalyzing and oxidizing formaldehyde at room temperature is decreased remarkably.

Hydrogenating and pour point depressing catalyst and its preparing method

The invention discloses a hydro dewaxing catalyst and the preparation method. In the method, compound with hydrogen active component is mixed with aluminum dry gel to prepare adhesive; and then the adhesive is mixed with shape-selective cracked zeolite and is pinched in shape; after drying and roasting, catalyst carrier is yielded; then the catalyst carrier is impregnated in the impregnating solution containing the rest active component and promoter; and after drying and roasting again, the catalyst of the invention is yielded. The invention is capable of taking full advantage of the alumina used as adhesive in the catalyst carrier under low hydrogen active component content conditions to prepare adhesive containing all the molybdenum and tungsten and part of the nickel, thereby keeping a certain amount of nickel oxide in the zeolite. The rest of the active metal component is distributed in the alumina, keeping the zeolite passage unobstructed with good hydro dewaxing effect and effectively improving the hydrogen addition and purification performance of the catalyst. The catalyst is especially suitable for hydro dewaxing of raw material containing wax and with high nitrogen impurity content and suitable for hydrogen addition and purification.

Mesoporous Y-type zeolite molecular sieve and preparation method thereof

InactiveCN103214003APlay a structural roleLow costFaujasite aluminosilicate zeoliteMolecular sieveSilanes
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.
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