...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Alkali-Resistant NO_X Reduction over SCR Catalysts via Boosting NH_3 Adsorption Rates by In Situ Constructing the Sacrificed Sites
【24h】

Alkali-Resistant NO_X Reduction over SCR Catalysts via Boosting NH_3 Adsorption Rates by In Situ Constructing the Sacrificed Sites

机译：通过原位构建牺牲的位点，通过促进NH_3吸附速率来减少SCR催化剂的耐碱NO_X。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Currently, improving the alkali resistance of vanadium-based catalysts still remains as an intractable issue for the selective catalytic reduction of NO_x with NH_3 (NH_3-SCR). It is generally believed that the decrease in adsorbed NH_x species deriving from the declined acidic sites is the chief culprit for the deactivation of alkali-poisoned catalysts. Herein, alkali-resistant NO_x, reduction over SCR catalysts via boosting NH_3 adsorption rates was originally demonstrated by in situ constructing the sacrificed sites. It is interesting that the adsorbed NH_x species largely decrease while the NH_3 adsorption rate is well kept over the V_2O_5/CeO_2 catalyst by in situ constructing the sacrificed sites. The SCR activity could be maintained after alkali poisoning because in situ constructed SO4_~(2-)groups would prefer to be combined with K~+ so that the specific V=O species can endow K-poisoned V_2O_s/CeO_2 with high adsorption rate of NH_3 and high reactivity of NH_x species. This work provides a new viewpoint that NH_3 adsorption rate plays more decisive roles in the performance of alkali-poisoned catalysts than the amount of NH_3 adsorption and enlightens an alternative strategy to improve the alkali-resistance of catalysts, which is significant to both the academic and industrial fields.
机译：目前，提高钒基催化剂的耐碱性仍然是具有NH_3（NH_3-SCR）的NO_X的选择性催化还原的难治性问题。人们普遍认为，从下降的酸性位点衍生的吸附NH_X物种的降低是用于停用碱中毒催化剂的主要罪魁祸首。在此，耐碱NO_X，通过升压NH_3吸附速率来减少SCR催化剂，原位构建处死的位点。有趣的是，吸附的NH_X物种在很大程度上降低，而NH_3吸附速率通过原位构建牺牲的位点通过v_2O_5 / CeO_2催化剂保持良好。在碱中毒后可以维持SCR活性，因为原位构造的SO4_〜（2-）基团更喜欢与K〜+组合，使特定的V = O物种能够以高吸附速度赋予K-中毒V_2O_S / CEO_2 NH_3和NH_X物种的高反应性。这项工作提供了一种新的观点，即NH_3吸附率在碱中毒催化剂的性能下比NH_3吸附量产生更多的决定性作用，并启示一种改善催化剂的耐碱性的替代策略，这对学术和学术界都具有重要意义工业领域。

著录项

  • 来源
    《Environmental Science & Technology》 |2020年第20期|13314-13321|共8页
  • 作者

    Guangyu Zhou; Phornphimon Maitarad; Penglu Wang; Lupeng Han; Tingting Yan; Hongrui Li; Jianping Zhang; Liyi Shi; Dengsong Zhang;

  • 作者单位

    International joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    International Joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    International joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    International joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    International Joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    International Joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    International Joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    international joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

    International Joint Laboratory of Catalytic Chemistry Department of Chemistry Research Center of Nano Science and Technology College of Sciences Shanghai University Shanghai 200444 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号