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57Fe穆斯堡尔谱研究Ir-Fe催化剂用于CO选择氧化反应
  • ISSN号：0253-9837
  • 期刊名称：《催化学报》
  • 时间：0
  • 分类：O643[理学—物理化学;理学—化学]
  • 作者机构：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023, [2]中国科学院研究生院,北京100049, [3]南京大学化学化工学院,江苏南京210093
  • 相关基金：Supported by the Hundred Talents Program of Chinese Academy of Sciences and the National Natural Science Foundation of China （20325620 20773122 and 20673055）
作者： 刘阔[1,2], 张万生[1], 王军虎[1], 王爱琴[1], 黄延强[1], 金长子[1], 沈俭一[3], 张涛[1]
关键词： 一氧化碳, 选择氧化, 铱, 铁, 准原位穆斯堡尔谱, 吸附量热, 金属-金属相互作用, carbon monoxide, selective oxidation, iridium, iron, quasi Mssbauer spectroscopy, microcalorimetry, metal-metal interaction
中文摘要：

采用不同浸渍顺序制备了三种Ir-Fe催化剂,其CO选择氧化（PROX）反应活性差别很大,其中共浸渍的Ir-Fe催化剂活性最高.吸附量热研究表明,三种催化剂的H2和CO吸附存在差别.通过对三种催化剂还原后、再氧化和反应后准原位57Fe穆斯堡尔谱的研究,得到各种Fe物种信息.结果表明,三种制备方法影响催化剂中Ir-Fe相互作用强度,导致催化剂中Fe物种的氧化还原性能不同.催化剂中Fe2＋（a）的含量与CO转化率呈正比关系,Fe2＋（a）是PROX反应过程中活化氧的活性中心.浸渍顺序改变了Ir-Fe间相互作用强度,从而改变Fe2＋（a）物种含量,影响PROX反应活性.Ir-Fe间的相互作用可以稳定活化氧的Fe2＋（a）物种,为今后研究金属-金属间的相互作用提供借鉴.

英文摘要：

New insights on the interaction between Ir and Fe oxide are reported.Three Ir-Fe catalysts were prepared by different impregnation sequences of an Al2O3 support.Co-impregnation gave a better catalyst for the preferential CO oxidation in H2（PROX） reaction.Microcalorimetry data showed that the adsorption of CO and H2 were different.Quasi in situ Mssbauer data of the three catalysts after reduction,reoxidation,and PROX reaction showed that a strong interaction between Ir and Fe affected the redox properties of the Ir-Fe catalysts.CO conversion was proportional to the concentration of the Fe2＋（a） species,thus,Fe2＋（a） was an active site in the PROX reaction.The impregnation sequence influenced the interaction between Ir and Fe and consequently,the amount of the active Fe2＋（a） species.A strong Ir-Fe interaction stabilized the active Fe2＋ sites for activating O2.

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期刊信息
  • 《催化学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国化学会 中国科学院大连化学物理研究所
  • 主编：李灿 张涛
  • 地址：大连市沙河口区中山路457号
  • 邮编：116023
  • 邮箱：chxb@dicp.ac.cn
  • 电话：0411-84379240
  • 国际标准刊号：ISSN：0253-9837
  • 国内统一刊号：ISSN：21-1195/O6
  • 邮发代号:8-93
  • 获奖情况:
  • 第三届国家期刊奖提名奖,中国科协精品科技期刊示范项目
  • 国内外数据库收录:
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  • 被引量:19199