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Ethylene Trapping of Palladium-impregnated Zeolites for Cold-start Emission Control by Taekyung Ryu; Jaehoon Jeong; Sang Woo Byun; Sungjoon Kweon; Jiseok Park; Wo Bin Bae; Do Yeong Kim; Young Jin Kim; Min Bum Park; Sung Bong Kang is a Engineering article available to read on EtoBox.

What is Ethylene Trapping of Palladium-impregnated Zeolites for Cold-start Emission Control about?

The C 2 H 4 adsorption and desorption properties of palladium-impregnated zeolites with different pore systems (i. e., Pd-beta, Pd-ZSM-5, and Pd-SSZ-13) but similar Si/Al ratios (13-16) and Pd loadings (0.81-0.91 wt%) have been investigated under both dry and wet conditions. The medium-pore Pd-ZSM-5 zeolite was found to show a much higher C 2 H 4 adsorption capacity than the large-pore Pd-beta and small-pore Pd-SSZ-13 zeolites, despite their similar Si/Al ratios and Pd loadings. During the desorption period, interestingly, the Pd-ZSM-5 was capable of oxidizing most of the adsorbed C 2 H 4 to CO 2 , revealing its functionality as a catalyzed hydrocarbon trap. The overall characterization results demonstrate that the formation of Pd 2+ ions, which serve as both adsorption and oxidation sites, is more active in Pd-ZSM-5 than Pd-beta and Pd-SSZ-13. Furthermore, the thermal treatment of the Pd-ZSM-5 at 750 °C significantly enhanced its C 2 H 4 trapping performance, due to the redistribution of PdO particles to Pd 2+ ions, which was confirmed with a negligible adsorption activity of the PdO/SiO 2 . This work presents that the interaction between Pd ions and zeolite supports is crucial fo

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Author

Taekyung Ryu; Jaehoon Jeong; Sang Woo Byun; Sungjoon Kweon; Jiseok Park; Wo Bin Bae; Do Yeong Kim; Young Jin Kim; Min Bum Park; Sung Bong Kang

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)