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钯前驱体对钯纳米催化剂催化氧化挥发性有机成分活性的影响

Effects of Palladium Precursors on the Activity of Palladium Nanocatalysts for the Oxidation of Volatile Organic Components.

作者信息

Li Qingtao, Cai Qi, Li Xiaoyun, Han Enshan, Sun Yanmin, Lu Yanfei, Cai Zhe, Yu Haibin

机构信息

School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300401, China.

CNOOC Tianjin Chemical Research and Design Institute Co., Ltd., Tianjin 300131, China.

出版信息

Nanomaterials (Basel). 2023 Mar 27;13(7):1189. doi: 10.3390/nano13071189.

DOI:10.3390/nano13071189
PMID:37049282
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10097109/
Abstract

To screen a suitable precursor, the effects of palladium salts on performance of Pd nanocatalysts for the oxidation of volatile organic components (VOCs) were investigated. A series of catalysts was prepared by impregnating Pd(NO), PdCl and Pd(NH)Cl on alumina-coated cordierites. These catalysts were characterized by XRF, ICP-OES, XRD, N adsorption-desorption, TEM, EDS, Raman spectroscopy, pulse-CO chemisorption, H-TPR, NH-TPD, and XPS. Pulse-CO chemisorption and TEM showed that Pd species formed by Pd(NO) have the highest metal dispersion (17.7%), while the other two were aggregating. For the same Pd loading, the higher the metal dispersion, the more the number of PdO species, so the number of PdO particles in the catalyst prepared from Pd (NO) is the largest. The catalytic oxidation activities of these catalysts were evaluated by ethane and propane. Based on a 99% conversion in the oxidation of ethane and propane at 598 K and 583 K, respectively, the catalyst prepared from Pd(NO) was considered to be the best performing catalyst. The chloride species in precursors can promote the aggregation of Pd species and poison the catalysts. The results show that Pd(NO) is more suitable as the precursor of VOC oxidation catalyst than PdCl and Pd(NH)Cl.

摘要

为筛选合适的前驱体，研究了钯盐对用于挥发性有机成分（VOCs）氧化的钯纳米催化剂性能的影响。通过将Pd(NO)、PdCl和Pd(NH)Cl负载在涂覆氧化铝的堇青石上制备了一系列催化剂。这些催化剂通过XRF、ICP-OES、XRD、N吸附-脱附、TEM、EDS、拉曼光谱、脉冲CO化学吸附、H-TPR、NH-TPD和XPS进行表征。脉冲CO化学吸附和TEM表明，由Pd(NO)形成的钯物种具有最高的金属分散度（17.7%），而其他两种则发生聚集。对于相同的钯负载量，金属分散度越高，PdO物种的数量越多，因此由Pd(NO)制备的催化剂中PdO颗粒的数量最多。通过乙烷和丙烷对这些催化剂的催化氧化活性进行了评估。基于分别在598 K和583 K下乙烷和丙烷氧化的99%转化率，由Pd(NO)制备的催化剂被认为是性能最佳的催化剂。前驱体中的氯物种会促进钯物种的聚集并使催化剂中毒。结果表明，与PdCl和Pd(NH)Cl相比，Pd(NO)更适合作为VOC氧化催化剂的前驱体。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/db97/10097109/857214f808c3/nanomaterials-13-01189-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/db97/10097109/71d220fca2f0/nanomaterials-13-01189-g009.jpg
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本文引用的文献

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通过壳层隔离纳米粒子增强拉曼光谱对非均相纳米催化过程进行原位动态跟踪。
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