Effect of slurry processing on the properties of catalytically active copper-alumina aerogel material for applications in three-way catalysis
Effect of slurry processing on the properties of catalytically active copper-alumina aerogel material for applications in three-way catalysis
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浆料加工对三元催化用铜铝气凝胶材料性能的影响
DOI：
10.1007/s10971-022-05757-5
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发表时间：
2022
影响因子：
2.5
通讯作者：
Carroll, Mary K.
中科院分区：
文献类型：
--
作者：
Anderson, Ann M.;Bruno, Bradford A.;Santos, Joana;Avanessian, Chris;Carroll, Mary K.
本研究考察了铜-氧化铝（CuAl）气凝胶的催化性能，这是在汽车尾气处理系统中使用贵金属的可能替代品，需要同时转化一氧化碳，未燃烧的碳氢化合物和氮氧化物。为了成为一种可行的替代方案，气凝胶材料需要经受住糊化过程，才能在基材上涂覆，并且需要在汽车尾气中典型的潮湿环境中保持性能。在本研究中，我们在酸性（pH ~4）水溶液中搅拌热处理铜-氧化铝气凝胶。溶液随后在60°C的常压条件下干燥。浆化CuAl气凝胶的物理性质（比表面积、x射线衍射、形貌）与未浆化材料相似。在模拟汽车尾气环境中进行的催化测试表明，气凝胶可以在潮湿环境中存活。在干燥和潮湿条件下，浆化气凝胶和非浆化气凝胶氧化丙烯和一氧化碳的能力相似。在高氧环境下增加湿度会降低催化性能，而在低氧环境下增加湿度会提高催化性能。对一氧化氮的催化性能不太一致：在任何条件下，泥浆样品的表现都不如非泥浆样品。铜氧化铝气凝胶可以泥浆和暴露在潮湿的排气流，并保持三向催化性能。左图显示了材料制备时和热处理后的图像。经过热处理和浆化后孔隙体积减小。右边的图像显示了在干燥和潮湿条件下对CO的催化性能。
This study examines the catalytic performance of copper-alumina (CuAl) aerogel which is a possible alternative to the use of precious metals in automotive exhaust treatment systems which require simultaneous conversion of carbon monoxide, unburnt hydrocarbons and nitrogen oxides. To be a viable alternative, the aerogel materials need to withstand a slurrying process to enable coating onto a substrate and they need to maintain performance in a humid environment typical of what is seen in automotive exhaust. In this study, we slurried heat-treated copper-alumina aerogels in an acidic (pH ~4) aqueous solution under mechanical stirring. The solution was subsequently dried at 60 °C under ambient pressure conditions. Physical properties of slurried CuAl aerogel (surface area, X-ray diffraction, morphology) were similar to those of non-slurried materials. Catalytic testing in a simulated automotive exhaust environment demonstrated that the aerogels can survive exposure to humidity. The ability of the slurried and non-slurried aerogels to oxidize propene and carbon monoxide was similar under dry and humid conditions. In a high-O2environment adding humidity degraded catalytic performance while in a low-O2environment the humidity improved performance. The catalytic performance toward nitrogen monoxide was less consistent: the slurried sample did not perform as well as the non-slurried sample under any conditions.Copper-alumina aerogels can be slurried and exposed to a humid exhaust stream and maintain three-way catalytic performance. The figures on the left show images of the material as prepared, and after heat treatment. Pore volume is reduced after heat treatment and slurrying. The images on the right show catalytic performance for CO in dry and humid conditions.
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影响因子：
1.6
作者：
A. Anderson;B. A. Bruno;F. Dilone;M. LaRosa;Thomas Andre;Chris Avanessian;Mary K. Carroll
通讯作者：
A. Anderson;B. A. Bruno;F. Dilone;M. LaRosa;Thomas Andre;Chris Avanessian;Mary K. Carroll
影响因子：
--
作者：
Charlotte N. Sisk;L. Hope-weeks
通讯作者：
Charlotte N. Sisk;L. Hope-weeks
气凝胶中的氮吸附
影响因子：
3.5
作者：
G. Reichenauer;G. Scherer
通讯作者：
G. Scherer
气凝胶催化剂的台式规模测试：初步结果
影响因子：
2.5
作者：
B. Bruno;A. Anderson;Mary K. Carroll;Thomas B. Swanton;P. Brockmann;T. Palace;Isaac A. Ramphal
通讯作者：
Isaac A. Ramphal
通过快速超临界萃取方法制备二氧化硅气凝胶整体。
DOI：
--
发表时间：
2014
期刊：
Journal of Visualized Experiments
影响因子：
--
作者：
Mary K. Carroll;A. Anderson;Caroline A. Gorka
通讯作者：
Caroline A. Gorka