硅铝比对 Pd/Beta 沸石中 NO 吸附性能的影响。
Effects of Si/Al Ratio on Passive NO Adsorption Performance over Pd/Beta Zeolites.
机构信息
Beijing Key Laboratory for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Engineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
出版信息
Molecules. 2023 Apr 16;28(8):3501. doi: 10.3390/molecules28083501.
In the current article, the effect of Si/Al ratio on the NO adsorption and storage capacity over Pd/Beta with 1 wt% Pd loading was investigated. The XRD, Al NMR and Si NMR measurements were used to determine the structure of Pd/Beta zeolites. XAFS, XPS, CO-DRIFT, TEM and H-TPR were used to identify the Pd species. The results showed that the NO adsorption and storage capacity on Pd/Beta zeolites gradually decreased with the increase of Si/Al ratio. Pd/Beta-Si (Si-rich, Si/Al260) rarely has NO adsorption and storage capacity, while Pd/Beta-Al (Al-rich, Si/Al6) and Pd/Beta-C (Common, Si/Al~25) exhibit excellent NO adsorption and storage capacity and suitable desorption temperature. Pd/Beta-C has slightly lower desorption temperature compared to Pd/Beta-Al. The NO adsorption and storage capacity increased for Pd/Beta-Al and Pd/Beta-C by hydrothermal aging treatment, while the NO adsorption and storage capacity on Pd/Beta-Si had no change.
在目前的文章中，研究了 Si/Al 比对负载 1wt%Pd 的 Pd/Beta 上的 NO 吸附和存储容量的影响。XRD、Al NMR 和 Si NMR 测量用于确定 Pd/Beta 沸石的结构。XAFS、XPS、CO-DRIFT、TEM 和 H-TPR 用于鉴定 Pd 物种。结果表明，随着 Si/Al 比的增加，Pd/Beta 沸石上的 NO 吸附和存储容量逐渐降低。Pd/Beta-Si（富 Si，Si/Al260）几乎没有 NO 吸附和存储容量，而 Pd/Beta-Al（富 Al，Si/Al6）和 Pd/Beta-C（普通，Si/Al~25）则表现出优异的 NO 吸附和存储容量和合适的脱附温度。Pd/Beta-C 的脱附温度略低于 Pd/Beta-Al。水热老化处理后，Pd/Beta-Al 和 Pd/Beta-C 的 NO 吸附和存储容量增加，而 Pd/Beta-Si 的 NO 吸附和存储容量没有变化。
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