Unified Metallic Catalyst Aging Strategy and Implications for Water Treatment

Chung-Seop Lee; Sujin Guo; Hojung Rho; Juliana Levi; Sergi Garcia-Segura; Michael S. Wong; Jorge Gardea-Torresdey; Paul Westerhoff

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Unified Metallic Catalyst Aging Strategy and Implications for Water Treatment

机译：统一金属催化剂老化策略与水处理影响

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Heterogeneous catalysis holds great promise for oxidizing or reducing a range of pollutants in water. A well-recognized, but understudied, barrier to implement catalytic treatment centers around fouling or aging over time of the catalyst surfaces. To better understand how to study catalyst fouling or aging, we selected a representative bimetallic catalyst (Pd-In supported on Al_2O_3), which holds promise to reduce nitrate to innocuous nitrogen gas byproducts upon hydrogen addition, and six model solutions (deionized water, sodium hypochlorite, sodium borohydride, acetic acid, sodium sulfide, and tap water). Our novel aging experimental apparatus permitted single passage of each model solution, separately, through a small packed-bed reactor containing replicate bimetallic catalyst "beds" that could be sacrificed weekly for off-line characterization to quantify impacts of fouling or aging. The composition of the model solutions led to the following gradual changes in surface composition, morphology, or catalytic reactivity: (ⅰ) formation of passivating species, (ⅱ) decreased catalytic sites due to metal leaching under acid conditions or sulfide poisoning, (ⅲ) dissolution and/or transformation of indium, (ⅳ) formation of new catalytic sites by the introduction of an additional metallic element, and (ⅴ) oxidative etching. The model solution water chemistry captured a wide range of conditions likely to be encountered in potable or industrial water treatment. Aging-induced changes altered catalytic activity and provided insights into potential strategies to improve long-term catalyst operations for water treatment.

机译：异质催化对于氧化或减少水中的一系列污染物具有很大的承诺。公认的，但是将被解读的，但是，在催化剂表面的时间围绕污垢或老化而实施催化处理中心。为了更好地了解如何研究催化剂污垢或衰老，我们选择了代表性的双金属催化剂（PD-in on Al_2O_3），该催化剂具有将硝酸盐减少到氢添加时的无害的氮气副产物，以及六种模型解决方案（去离子水，钠次氯酸盐，硼氢化钠，乙酸，硫化钠和自来水）。我们的新型老化实验装置通过含有重复的双金属催化剂“床”的小填充床反应器分开允许每种模型溶液的单一通道，该反应器可以每周处死以用于偏心表征以量化污垢或老化的影响。模型溶液的组成导致表面组成，形态或催化反应物种的以下逐渐变化：（Ⅰ）钝化物种的形成，（Ⅱ）由于酸条件或硫化物中毒下的金属浸出而降低催化位点，（Ⅲ）通过引入另外的金属元素和（ⅴ）氧化蚀刻来形成新催化位点的溶出和/或转化新的催化位点。模型解决方案水化学捕获了可饮用或工业水处理中可能遇到的广泛条件。衰老诱导的变化改变了催化活性，并提供了改善水处理长期催化剂操作的潜在策略的见解。

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《Environmental Science & Technology》 |2021年第16期|11284-11293|共10页
作者
Chung-Seop Lee; Sujin Guo; Hojung Rho; Juliana Levi; Sergi Garcia-Segura; Michael S. Wong; Jorge Gardea-Torresdey; Paul Westerhoff;
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作者单位

School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona 85287-3005 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States;

Department of Civil and Environmental Engineering Rice University Houston Texas 77005 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States;

School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona 85287-3005 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States Department of Land Water and Environment Research Korea Institute of Civil Engineering and Building Technology Ilsanseo-Gu Goyang-Si Gyeonggi-Do 10223 Republic of Korea;

School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona 85287-3005 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States;

School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona 85287-3005 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States;

Department of Civil and Environmental Engineering Rice University Houston Texas 77005 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States;

Department of Chemistry and Biochemistry The University of Texas at El Paso El Paso Texas 79968 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States;

School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona 85287-3005 United States Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类
关键词
bimetallic catalyst; catalyst aging; alumina-supported Pd-In; deactivation;

机译：双金属催化剂;催化剂老化;氧化铝支持的pd-in;停用;

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Unified Metallic Catalyst Aging Strategy and Implications for Water Treatment

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