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Abstract <p>The light olefins selectivity and stability of SAPO-18 catalyst was greatly improved by the post acid treatment. The effect of post treatment with different inorganic acids (H<sub>3</sub>PO<sub>4</sub>, H<sub>2</sub>SO<sub>4</sub>, HCl and HNO<sub>3</sub>) on the physicochemical properties of SAPO-18 and on the performance of dimethyl ether to olefins (DTO, WHSV: 3.546 h<sup>–1</sup>, 400°C, atmospheric pressure) conversion was investigated. The order of the effect of acid treatment on the catalytic performance of SAPO-18 was HNO<sub>3</sub> &gt; HCl &gt; H<sub>2</sub>SO<sub>4</sub>, and there was no acid treatment effect of H<sub>3</sub>PO<sub>4</sub>. In particular, SAPO-18 (SN) post-treated with HNO<sub>3</sub> was newly created mesopores (<i>V</i> <sub>meso</sub>: 91 mm<sup>3</sup>&#xa0;g<sup>–1</sup>) and micropores (<i>V</i> <sub>micro</sub>: 305 mm<sup>3</sup>&#xa0;g<sup>–1</sup>), and also the amount of acid sites (Lewis: 267&#xa0;µmol&#xa0;g<sup>–1</sup>, Brønsted: 253 µmol&#xa0;g<sup>–1</sup>) was optimized, resulting in excellent physicochemical properties compared to the untreated SAPO-18 (S). Consequently, in the DTO performance test, the light olefins selectivity of SN (95.7%, ethylene: 31.1%, propylene: 46.2%, butene: 18.4%) and the single-run lifetime (6.5 h) were increased 11.2% and 2.1 times compared to S (light olefins selectivity: 84.5%, single-run lifetime: 3 h), respectively.</p>

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Acid-Treated SAPO-18 Catalyst with High Light Olefins Selectivity and Stability

  • 期刊论文

  • 发表日期：

    2026年8月2日

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  • Kum Hyok Ri,
  • Song Chol Jong,
  • Jin Gun Rim,
  • Kye Hak Ko,
  • Hyang Sun Kim,
  • Bong Hak Ri

摘要

Abstract

The light olefins selectivity and stability of SAPO-18 catalyst was greatly improved by the post acid treatment. The effect of post treatment with different inorganic acids (H3PO4, H2SO4, HCl and HNO3) on the physicochemical properties of SAPO-18 and on the performance of dimethyl ether to olefins (DTO, WHSV: 3.546 h–1, 400°C, atmospheric pressure) conversion was investigated. The order of the effect of acid treatment on the catalytic performance of SAPO-18 was HNO3 > HCl > H2SO4, and there was no acid treatment effect of H3PO4. In particular, SAPO-18 (SN) post-treated with HNO3 was newly created mesopores (V meso: 91 mm3 g–1) and micropores (V micro: 305 mm3 g–1), and also the amount of acid sites (Lewis: 267 µmol g–1, Brønsted: 253 µmol g–1) was optimized, resulting in excellent physicochemical properties compared to the untreated SAPO-18 (S). Consequently, in the DTO performance test, the light olefins selectivity of SN (95.7%, ethylene: 31.1%, propylene: 46.2%, butene: 18.4%) and the single-run lifetime (6.5 h) were increased 11.2% and 2.1 times compared to S (light olefins selectivity: 84.5%, single-run lifetime: 3 h), respectively.