Scholarlink

<p>Alkali metal pollutants are often regarded as toxic agents for the catalytic hydrodeoxygenation (HDO) of biomass, hindering the conversion of biomass towards higher-value hydrocarbon fuels. In this study, a series of Pt/WO<sub><i>x</i></sub> catalysts for HDO with varying K contents were synthesized, and an intriguing effect of K on activity was observed. The introduced K<sup>+</sup> occupies the H position of the hydroxyl group, poisoning Bransted acid sites (BAS); however, it regulates the adsorption of olefin intermediates, consequently facilitating the whole HDO reaction. Notably, dissociated hydrogen species on the metal sites can spillover to adjacent WO<sub><i>x</i></sub> sites, liberating the hydroxyl group poisoned by K and thus <i>operando</i> forming BAS again (back to 84% of the K-free catalyst), which safeguards the dehydration step from alkali metal severe poisoning. By comparing the catalytic behavior on WO<sub><i>x</i></sub> with non-reducible acidic Si-Al zeolite supports, we demonstrate that this ‘deliverance effect’ depends on the reducibility of the supports. The optimal 0.2Pt0.8K/WO<sub><i>x</i></sub> catalyst exhibited 2.6 times higher catalytic activity than 0.2Pt/WO<sub><i>x</i></sub>, which also finds its applicability on other noble metals like Ru and Pd, achieving excellent yields across various lignin derivatives. This work not only reports an efficient K-doped Pt catalyst design for HDO reaction but also provides a more comprehensive understanding of the catalytic role of K additives on acid and metal sites.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

WOx-supported K-Pt catalysts: acid site regeneration and K-promoted C=C hydrogenation synergy for biomass hydrodeoxygenation

  • 期刊论文

  • 发表日期：

    2025年9月4日

查看全文
  • Yanling Liu,
  • Wencong Liu,
  • Honghui Ning,
  • Bing Lu,
  • Shipan Liang,
  • Zhouyuan Wang,
  • Xiaowen Zhu,
  • Yongzhu Fu,
  • Kaichao Zhang,
  • Shanjun Mao,
  • Yong Wang

摘要

Alkali metal pollutants are often regarded as toxic agents for the catalytic hydrodeoxygenation (HDO) of biomass, hindering the conversion of biomass towards higher-value hydrocarbon fuels. In this study, a series of Pt/WOx catalysts for HDO with varying K contents were synthesized, and an intriguing effect of K on activity was observed. The introduced K+ occupies the H position of the hydroxyl group, poisoning Bransted acid sites (BAS); however, it regulates the adsorption of olefin intermediates, consequently facilitating the whole HDO reaction. Notably, dissociated hydrogen species on the metal sites can spillover to adjacent WOx sites, liberating the hydroxyl group poisoned by K and thus operando forming BAS again (back to 84% of the K-free catalyst), which safeguards the dehydration step from alkali metal severe poisoning. By comparing the catalytic behavior on WOx with non-reducible acidic Si-Al zeolite supports, we demonstrate that this ‘deliverance effect’ depends on the reducibility of the supports. The optimal 0.2Pt0.8K/WOx catalyst exhibited 2.6 times higher catalytic activity than 0.2Pt/WOx, which also finds its applicability on other noble metals like Ru and Pd, achieving excellent yields across various lignin derivatives. This work not only reports an efficient K-doped Pt catalyst design for HDO reaction but also provides a more comprehensive understanding of the catalytic role of K additives on acid and metal sites.