the sieve method (for primes) oor Sjinees
the sieve method (for primes)
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The preparation method comprises: contacting the raw material powder of the beta molecular sieve with normal pressure and dynamic water vapour, and then with ammonium fluosilicate.
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A Beta molecular sieve having multi-level channels, and synthesizing method thereof; the molecular sieve has a second-level mesoporous structure, and uses polyquaternium-6, polyquaternium-7, polyquaternium-22 and quaternium-39 as guiding agents for both micropores and mesopores during the synthesizing process.
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Compared with an MCM-22 molecular sieve, the molecular sieve shows improved catalysis performance, good service life and regeneration performance, the manufacturing method is simple, the condition is moderate, the loss is low, side reactions are less, and a high-purity product providing a high yield can be easily obtained by using low cost.
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The mordenite preparation method provided by the present invention broadens the sources of starting materials for molecular sieve materials, is low-cost, has a simple process route, and greatly reduces the cost of synthesis of molecular sieves.
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Disclosed is a method for synthesizing a crystalline molecular sieve SSZ-13, characterized in that the method comprises bringing the following raw materials into contact in water under a crystallization condition: (1) at least one tetravalent silicon source, (2) at least one trivalent aluminium source, (3) at least one alkali metal compound, (4) choline cations and/or SSZ-13 seed crystals, and (5) hydroxide ions.
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The template agent used in the method of the present invention is less volatile, and the resulting high silicon Y molecular sieve has a high degree of crystallinity and a silica-alumina ratio of not less than 6.
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Although the computer worked most of the time computing trajectories for ballistics problems, some weekends Lehmer and her husband used it to solve certain number theory problems using the sieve methods that they were working on :
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The preparation method is as follows: firstly performing an NH4+ exchange treatment on the K-ZSM-22 molecular sieve to obtain an H-ZSM-22 molecular sieve, then performing a hydrothermal treatment to obtain a modified H-ZSM-22 molecular sieve, and then after uniform mixing with the amorphous aluminium-silicon, adding the aluminium oxide binder and a sesbania powder, mixing and kneading same, grinding into clusters, forming same by band extrusion, then drying and calcinating same, and finally loading active metals Ni and Mo.
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The present invention relates to a method for preparing a NaY molecular sieve of a high silica-alumina ratio, wherein deionized water, a silicon source, an aluminum source, an alkali source and ILs as a template agent are mixed to obtain an initial gel mixture: the initial gel mixture is kept at an appropriate temperature and aged, then fed into a high pressure synthesis reactor for crystallization; the solid product is separated and dried, to obtain the NaY molecular sieve of a high silica-alumina ratio, wherein the ILs is a short chain alkylimidazole ionic liquid.
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The method avoids using benzyl trimethyl quaternary ammonium ions (BzTMA+) or N,N,N-trimethyl-1-amantadine cations as structure-directing agents, and obtains high-quality crystal molecular sieve SSZ-13.
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In Bombieri explains the source of Selberg's number theory sieve and shows that the idea of Selberg's l method and of his l 2 sieve has its origin in Selberg's work on the analytic theory of the Riemann zeta function.
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A method for preparing a Beta molecular sieve having a mesoporous/microporous combined channel, characterized by comprising mesopores of 2-13 nm; and using a macromolecular polymer as a guiding agent for both micropores and mesopores during the synthesizing process.
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Select the best particle size in the good, the preparation can be used granulation and sieving method of ceramic powder particle size required. Â
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A Beta molecular sieve having a mesoporous/microporous combined channel structure, and synthesizing method thereof, characterized by comprising mesopores of 2-13 nm, and using one or more of polyquaternium-6, polyquaternium-7, polyquaternium-22 or polyquaternium-39 as guiding agents for both micropores and mesopores during the synthesizing process.
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Such size distributions have to be provided from other measuring methods, e.g. laser diffraction or sieve analyses, once in the course of the calibration procedure. Technical Specifications sensors:
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Mechanical screening is a major feed mills to use screening techniques, screening equipment, vibrating component is the main work screen surface, the widely used steel plate punching and weaving sieve screen, here we will introduce the screening of applications under the feed and general method of calculation.
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Bombieri applied his improved large sieve method to prove what is now called "Bombieri's mean value theorem", which concerns the distribution of primes in arithmetic progressions.
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This is not a surprise, because every measuring method uses different physical phenomena (sedimentation velocity, sieve mesh width, diffraction pattern) for the analysis of the particle size.
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... the Rankin-Selberg method, the "mollifier" device in the theory of Riemann's zeta function with its deep applications to zeros on or near the critical line and with Selberg's sieve as a by-product, ...
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The machine can make granules from wet powder materials or break down the dry lumpish material, which is widely used by the industries of pharmacy, chemical and foodstuff. Working Method By driving of mechanism, the cylinder is swinging to-and-fro to force the target material squeezed from sieve to make out granules or to smash it as granules .Technical Data
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20 sinne gevind in 7 ms. Hulle kom uit baie bronne en word nie nagegaan nie.