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Published on: August 18, 2020
The cooperative promotion induced by Na modification of the Pd-Ce/USY catalyst for HCHO oxidation at room temperature
Longbao Jiang1,2, Jiani Zheng1,2, Qiyong Li2,3
1Fujian Provincial Key Laboratory of Resources and Environmental Monitoring and Sustainable Management and Utilization, Sanming University Sanming Fujian 365004 China xiaofengliu@fjsmu.edu.cn.
Abstract:
Room-temperature catalytic oxidation is an important strategy for the efficient removal of indoor low-concentration HCHO. However, catalysts often suffer from insufficient generation of reactive oxygen species, accumulation of reaction intermediates, and decreased stability at low temperatures. In this study, Na modified Pd-Ce/USY catalysts were constructed using USY zeolite as the support, and the cooperative effect of Na and Ce on room-temperature HCHO oxidation was systematically investigated. Activity evaluation showed that the introduction of an appropriate amount of Na significantly enhanced the HCHO oxidation performance of the catalyst, and the Pd-Na-Ce/USY-R catalyst maintained 100% HCHO conversion during a 12 h continuous reaction. Various characterization results revealed that Na modification changes the framework acid-base properties and the interfacial oxygen environment, increases the population of defect-related oxygen species, and improves the low-temperature conversion of adsorbed HCHO-derived intermediates. The enhanced performance is attributed to the cooperative functions of Pd sites for HCHO/O2 activation, CeO x -associated sites for interfacial oxygen transfer, and Na-modified surface sites for accelerating intermediate removal.
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