期刊论文

Li, T;Guo, YB

英文

Separation and Purification Technology

1383-5866

2023

322

124344

10.1016/j.seppur.2023.124344

As shown in Fig. 1, the NOx adsorption and desorption behaviors of the alkali/alkaline earth metal-poisoned catalysts were studied in the absence of water. The adsorption was performed in a flowing gas containing 500 ppm NO, 10 % O2, and balanced with N2. As depicted in Fig. 1a, when the water is absent from the feed, a negative peak below 500 ppm represents that the fresh H-SSZ-13 (denoted as H-13-F) also shows NOx adsorption, which is attributed to the Brønsted acid sites of H-13-F [34], [35]

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Pd/SSZ-13 has been proposed as a passive NOx adsorber (PNA) to effectively alleviate NOx emission during vehicle cold start. However, the chemical poisons which are derived from biodiesel and lubricant oil are challenging for the practical application of PNA technology. In this paper, Pd/SSZ-13 was poisoned by alkali/alkaline earth metals to investigate the effects of chemical poisons on the adsorption performance of Pd/SSZ-13. It was found that the alkali/alkaline earth metals led to the decrease of surface area and Brønsted acid sites of Pd/...