2. Three-Way Catalyst Containing Second-Generation CZHow can we develo的简体中文翻译

2. Three-Way Catalyst Containing Se

2. Three-Way Catalyst Containing Second-Generation CZHow can we develop a new process to prepare a nearly per-fectly homogeneous solid solution of ceria–zirconia? This wasone of the most important themes for improvement in three-way catalysts in the early 1990s. In addition, the prepared ce-ria–zirconia solid solution should be of a single phase, prefera-bly a cubic phase, rather than a double or mixed phase. Theassumption was that a single phase solid solution would notexperience a large volume change and fragment, and wouldbe retained in the same phase under cycling of oxygen-richand oxygen-lean conditions at high temperature. We also as-sumed that it would be easier to store oxygen in, and releaseoxygen from, the lattice of a cubic phase oxide than from thatof a tetragonal or monoclinic phase oxide.The thermodynamically stable cubic phase of the ceria–zirconia solid solution has already been identified in theZrO 2 –CeO 2 system. 42–44,64–66 The phase diagrams reveal thatzirconia is almost 100% soluble in ceria when a 50/50 mixtureof Ce/Zr is heated to approximately 1600? C in air. These sol-id solutions exhibit a high OSC. 67 However, their specific sur-face area is too low to allow their use as automotive catalystsbecause, as mentioned earlier, a low specific surface area re-stricts the rate of oxygen storage/release.
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2.包含第二代CZ的三效催化剂<br>我们如何开发一种新的方法来制备几乎<br>完全均匀的二氧化铈-氧化锆固溶体?这是1990年代初<br>改进三效<br>催化剂的最重要主题之一。此外,制得<br>的氧化铈-氧化锆固溶体应为单相,最好<br>是立方相,而不是双相或混合相。该<br>假设是单相固溶体不会<br>经历大的体积变化和片段,以及将<br>在相同相位下的富含氧气的循环被保持<br>在高温和贫氧的条件。我们还-<br>得出的结论是,与四方或单斜相氧化物<br>相比,在立方相氧化物的晶格中存储氧和从中释放氧会更容易<br>。二氧化<br>铈-<br>氧化锆固溶体的热力学稳定的立方相已经在<br>ZrO 2 -CeO 2系统中确定。42–44,64–66相图显示,<br>当将50/50<br>的Ce / Zr混合物加热到大约1600 °C时,氧化锆几乎可以100%溶解在二氧化铈中<br>。C在空气中。这些固态<br>解决方案具有很高的OSC。67但是,它们的比<br>表面积太低,无法用作汽车催化剂<br>,因为如前所述,它的比表面积低。<br>严格限制氧气的储存/释放速率。
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2. 含有第二代CZ的三向催化剂<br>我们如何开发一个新的过程,准备一个几乎每<br>完全均匀的固体溶液-氧化锌?这是<br>改进三个最重要的主题之一-<br>方式催化剂在20世纪90年代初。此外,准备的ce-<br>里亚-氧化锌固体溶液应该是一个单一的阶段,首选<br>一个立方相,而不是一个双相或混合相。假设是,一个单一的阶段固体解决方案不会<br>体验大体积的变化和碎片,并会<br>在富含氧气的循环下保持在同一阶段<br>和高温下的缺氧条件。我们也作为<br>总结,这将是更容易存储氧气,并释放<br>氧气,一立方相氧化物的晶格比从<br>四角或单线相氧化物。<br>热力学稳定的立方相-<br>氧化锌固体溶液已在<br>ZrO 2-CeO 2系统。42-44,64-66 相位图显示<br>当50/50的混合物时,氧化锌几乎100%可溶于塞里亚<br>Ce/Zr 加热至约 1600<br>?C 在空气中。这些溶胶<br>ID解决方案表现出很高的OSC。67 然而,他们的具体超<br>面面积太低,不允许它们用作汽车催化剂<br>因为,如前所述,一个低特定的表面积重新<br>严格氧气储存/释放率。
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2. Three-Way Catalyst Containing Second-Generation CZHow can we develop a new process to prepare a nearly per-fectly homogeneous solid solution of ceria–zirconia? This wasone of the most important themes for improvement in three-way catalysts in the early 1990s. In addition, the prepared ce-ria–zirconia solid solution should be of a single phase, prefera-bly a cubic phase, rather than a double or mixed phase. Theassumption was that a single phase solid solution would notexperience a large volume change and fragment, and wouldbe retained in the same phase under cycling of oxygen-richand oxygen-lean conditions at high temperature. We also as-sumed that it would be easier to store oxygen in, and releaseoxygen from, the lattice of a cubic phase oxide than from thatof a tetragonal or monoclinic phase oxide.The thermodynamically stable cubic phase of the ceria–zirconia solid solution has already been identified in theZrO 2 –CeO 2 system. 42–44,64–66 The phase diagrams reveal thatzirconia is almost 100% soluble in ceria when a 50/50 mixtureof Ce/Zr is heated to approximately 1600? C in air. These sol-id solutions exhibit a high OSC. 67 However, their specific sur-face area is too low to allow their use as automotive catalystsbecause, as mentioned earlier, a low specific surface area re-stricts the rate of oxygen storage/release.<br>
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