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<p>Zeolites are investigated for complete methane oxidation to reduce sintering and deactivation of the active PdO nanoparticles. Pd/H-CHA is shown to have good low-temperature activity and remarkable tolerance to SO<sub>2</sub>. After an induction period with loss of activity, the activity is recovered and the catalyst withstands more than 200&#xa0;h on stream with 1000 ppm methane in the presence of 2 ppm SO<sub>2</sub>. The zeolite counter ions play a key role, and the literature indicates that ion exchange with alkali metals provides better water tolerance. Here we show, however, that the alkali ion exchanged Pd-CHA possess inferior sulfur tolerance compared to the parent Pd/H-CHA since the recovery of the catalytic effect is blocked. Deactivation by simultaneous SO<sub>2</sub> and water remains an unsolved challenge for complete methane oxidation catalysts.</p> Graphical abstract <p>A Pd/CHA catalyst for methane oxidation is shown to have remarkable resistance towards SO<sub>2</sub> in the feed gas and to lose it upon ion exchange with alkali metal ions.</p> <p></p>

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The Effect of Zeolite Counter Ion on a Pd/H-CHA Methane Oxidation Catalyst with Remarkable Tolerance Towards SO2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月7日

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  • Rasmus Lykke Mortensen,
  • Hendrik-David Noack,
  • Kim Pedersen,
  • Susanne Mossin,
  • Jerrik Mielby

摘要

Zeolites are investigated for complete methane oxidation to reduce sintering and deactivation of the active PdO nanoparticles. Pd/H-CHA is shown to have good low-temperature activity and remarkable tolerance to SO2. After an induction period with loss of activity, the activity is recovered and the catalyst withstands more than 200 h on stream with 1000 ppm methane in the presence of 2 ppm SO2. The zeolite counter ions play a key role, and the literature indicates that ion exchange with alkali metals provides better water tolerance. Here we show, however, that the alkali ion exchanged Pd-CHA possess inferior sulfur tolerance compared to the parent Pd/H-CHA since the recovery of the catalytic effect is blocked. Deactivation by simultaneous SO2 and water remains an unsolved challenge for complete methane oxidation catalysts.

Graphical abstract

A Pd/CHA catalyst for methane oxidation is shown to have remarkable resistance towards SO2 in the feed gas and to lose it upon ion exchange with alkali metal ions.