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Applying low-temperature titration for determination of metallic sites on active oxide supported catalysts
Liu, Zebang; Li, Jerry Pui Ho; Qi, Xiaomian; Dai, Yunqian; Yang, Yong
2019-04-21
Source PublicationCATALYSIS SCIENCE & TECHNOLOGY
ISSN2044-4753
Volume9Issue:8Pages:2008
SubtypeArticle
AbstractChemisorption-titration, as a surface sensitive analysis method, is widely applied for direct measurement of the specific surface area of metallic clusters on heterogeneous catalysts. However, on active oxide supports, the product yield of this method is strongly affected by the exchange of oxygen between the support and the titration gases. In this study, Pt- and Cu-based catalysts are used as the source for metallic site characterization through isothermal titration experiments within a wide temperature range. Pt/Fe2O3 catalysts were characterized using CO oxidation, and Cu/CeO2 catalysts were characterized using N2O decomposition. The titration products are CO2 and N-2, respectively. Detailed measurements require instant online mass spectroscopy characterization and temperature control from subzero to room temperatures; for this purpose an online micro reactor is developed and applied for quantitative product calibration. For both series of catalysts, MS signals are also measured on pure metallic powder and calibrated using a commercial chemisorption measurement system. The temperature dependence of both total titration products from the supported samples reveals that for each catalyst, there are narrow subzero temperature windows in which the titration products are only related with metallic sites. The results provide an approach towards a one-step chemisorption-titration procedure for measurement of dispersion on active oxide supported catalysts, which is a possible benchmark that bridges fundamental model catalysts and industrial applied catalysts in performance evaluation.
DOI10.1039/c8cy02610f
Language英语
WOS Research AreaChemistry
PublisherROYAL SOC CHEMISTRY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27171
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Liu, Zebang,Li, Jerry Pui Ho,Qi, Xiaomian,et al. Applying low-temperature titration for determination of metallic sites on active oxide supported catalysts[J]. CATALYSIS SCIENCE & TECHNOLOGY,2019,9(8):2008.
APA Liu, Zebang,Li, Jerry Pui Ho,Qi, Xiaomian,Dai, Yunqian,&Yang, Yong.(2019).Applying low-temperature titration for determination of metallic sites on active oxide supported catalysts.CATALYSIS SCIENCE & TECHNOLOGY,9(8),2008.
MLA Liu, Zebang,et al."Applying low-temperature titration for determination of metallic sites on active oxide supported catalysts".CATALYSIS SCIENCE & TECHNOLOGY 9.8(2019):2008.
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