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Abstract <p>The authors study the effect a second modifying metal (Rh) has on the acidic and catalytic properties of Mg/НZSM-5 in the conversion of dimethyl ether to light olefins. The state of the active components (Mg, Rh) on the zeolite surface is analyzed. It is shown that introducing rhodium into Mg/НZSM-5 considerably improves the on-stream stability of the catalyst, while the selectivity toward light olefins is preserved at a level of 75 wt&#xa0;%. It is found that different oxocationic or oxide species of magnesium form on the zeolite surface in a monometallic Mg/HZSM-5 sample. Introducing rhodium contributes to the stabilization of magnesium mostly in the form of Mg<sup>2+</sup> cations, while the Lewis acidic properties of magnesium cations are diminished. The combination of these factors contributes to the slowing down of the catalyst deactivation.</p>

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Conversion of Dimethyl Ether to Light Olefins on Rh–Mg/HZSM-5: The Role of Rhodium As a Modifier

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • M. I. Shilina,
  • T. I. Batova,
  • T. K. Obukhova,
  • N. V. Kolesnichenko

摘要

Abstract

The authors study the effect a second modifying metal (Rh) has on the acidic and catalytic properties of Mg/НZSM-5 in the conversion of dimethyl ether to light olefins. The state of the active components (Mg, Rh) on the zeolite surface is analyzed. It is shown that introducing rhodium into Mg/НZSM-5 considerably improves the on-stream stability of the catalyst, while the selectivity toward light olefins is preserved at a level of 75 wt %. It is found that different oxocationic or oxide species of magnesium form on the zeolite surface in a monometallic Mg/HZSM-5 sample. Introducing rhodium contributes to the stabilization of magnesium mostly in the form of Mg2+ cations, while the Lewis acidic properties of magnesium cations are diminished. The combination of these factors contributes to the slowing down of the catalyst deactivation.