摘要:
A porous solid acid catalyst for producing light olefins is prepared through pillaring and a solid state reaction of a raw material mixture. The catalyst is made of a porous material having a crystalline structure that is different from that of the raw material mixture. The catalyst exhibits excellent catalytic activity (i.e., conversion and selectivity) in the production of light olefins from hydrocarbon feeds such as full range naphthas.
摘要:
Disclosed are a hydrothermally stable porous molecular sieve catalyst and a preparation method thereof. The catalyst consists of a product obtained by the evaporation of water from a raw material mixture comprising a molecular sieve having a framework of Si—OH—Al—, a water-insoluble metal salt and a phosphate compound. The catalyst maintains its physical and chemical stabilities even in an atmosphere of high temperature and humidity. Accordingly, the catalyst shows excellent catalytic activity even when it is used in a severe process environment of high temperature and humidity in heterogeneous catalytic reactions, such as various oxidation/reduction reactions, including catalytic cracking reactions, isomerization reactions, alkylation reactions and esterification reactions.
摘要:
Disclosed is a process for producing light olefins from hydrocarbon feedstock. The process is characterized in that a porous molecular sieve catalyst consisting of a product obtained by evaporating water from a raw material mixture comprising a molecular sieve with a framework of Si—OH—Al— groups, a water-insoluble metal salt, and a phosphate compound, is used to produce light olefins, particularly ethylene and propylene, from hydrocarbon, while maintaining excellent selectivity to light olefins. According to the process, by the use of a specific catalyst with hydrothermal stability, light olefins can be selectively produced in high yield with high selectivity from hydrocarbon feedstock, particularly full-range naphtha. In particular, the process can maintain higher cracking activity than the reaction temperature required in the prior thermal cracking process for the production of light olefins, and thus, can produce light olefins with high selectivity and conversion from hydrocarbon feedstock.
摘要:
A method for fabricating a CCD image sensor includes the steps of forming a P type well in a surface of a semiconductor substrate, forming a buried CCD (BCCD) in a surface of the P type well, forming an offset gate and a reset gate on the BCCD at a predetermined interval, forming a floating diffusion region in the BCCD between the offset gate and the reset gate, forming a mask layer on an entire surface of the semiconductor substrate to form a contact hole in the floating diffusion region, forming a metal layer on the entire surface of the semiconductor substrate including the contact hole, and selectively removing the metal layer on the mask layer together with the mask layer to form a floating gate in the contact hole.
摘要:
A water supply control apparatus and method for an ice maker, in which an amount of supplied water is controlled so as to supply an accurate amount of the water to an ice tray. The method includes the steps of (a) supplying water to an ice tray for a predetermined time; (b) determining whether or not a proper amount of water has been supplied to the ice tray after the predetermined time has elapsed; and (c) resetting the predetermined time based on predetermined water supply data, in case that it is determined that the proper amount of water has not supplied to the ice tray.
摘要:
Disclosed are an anti-angiogenic compound, represented by Chemical Formula I, or a pharmaceutically acceptable salt thereof, a preparation method thereof, and a pharmaceutically acceptable composition including the same. Because the compound of Chemical Formula I potently suppresses the angiogenesis, the compound of Chemical Formula I is applicable to the prevention and treatment of diseases caused by aberrant activity of vascular endothelial growth factor, and available as an anti-angiogenic agent.
摘要:
An electrically programmable gate oxide anti-fuse device includes an anti-fuse aperture having anti-fuse links that include metallic and/or semiconductor electrodes with a dielectric layer in between. The dielectric layer may be an interlayer dielectric (ILD), an intermetal dielectric (IMD) or an etch stop layer. The anti-fuse device may includes a semiconductor substrate having a conductive gate (e.g., a high K metal gate) disposed on a surface of the substrate, and a dielectric layer disposed on the conductive gate. A stacked contact can be disposed on the dielectric layer and a gate contact is disposed on an exposed portion of the gate.
摘要:
A bactericidal and virucidal composition containing the natural products malic acid and grapefruit seed extract. Such compositions exhibit disinfectant effects on a broad spectrum of bacteria and viruses, and are particularly useful for disinfection of stalls, domestic animals and drinking water.
摘要:
A recording medium and a method for recording are provided. The recording medium according to an embodiment includes a control information used to represent a recording capacity of the recording medium, wherein the control information includes first information associated with a pre-defined recording capacity of the recording medium, and second information associated with a varied recording capacity of the recording medium, the second information being recorded at a position different from the first information.
摘要:
The present invention relates to a recording medium and apparatus and method for managing defective areas in the recording medium. According to an embodiment, the method includes (a) reading a defect management information recorded on a defect management area, the defect management information including second information specifying a location of a replacement area to replace the defective area and status information specifying whether or not the defective area is replaced; (b) identifying the defect management information; and (c) controlling a writing operation according to the result of step (b).