能源化学(英文版)

能源化学(英文) ›› 2016, Vol. 25 ›› Issue (5): 854-860.DOI: 10.1016/j.jechem.2016.06.001

• ARTICLES • 上一篇    下一篇

Promoter effect of La2O3 on gold catalyst with different textural structures

Huiyuan Xu1,2, Jingjie Luo2, Shenying Xu1, Denglei Zhu1, Wei Chu2   

  1. a Department of Chemical Engineering, Yibin University, Yibin 644000, Sichuan, China;
    b Department of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China
  • 收稿日期:2016-02-03 修回日期:2016-06-03 出版日期:2016-09-15 发布日期:2016-09-30
  • 通讯作者: Jingjie Luo, Wei Chu
  • 基金资助:

    This work was s upported by the foundation of programme from Education Department of Sichuan (15ZA0303) and New Century Excellent Talent Project of China (NCET-05-0783).

Promoter effect of La2O3 on gold catalyst with different textural structures

Huiyuan Xu1,2, Jingjie Luo2, Shenying Xu1, Denglei Zhu1, Wei Chu2   

  1. a Department of Chemical Engineering, Yibin University, Yibin 644000, Sichuan, China;
    b Department of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China
  • Received:2016-02-03 Revised:2016-06-03 Online:2016-09-15 Published:2016-09-30
  • Contact: Jingjie Luo, Wei Chu
  • Supported by:

    This work was s upported by the foundation of programme from Education Department of Sichuan (15ZA0303) and New Century Excellent Talent Project of China (NCET-05-0783).

摘要： Silica supported gold nanoparticles were synthesized and promoted by lanthanum oxide as dopant. The influences of La2O3 and silica textural structure on the gold dispersion, formation of active species, crystalline composition and the reacting role of dopants were studied in detail. The characterization results suggested that the dispersion of gold nanoparticles depended on the textural structure of silica without lanthanum oxide doping where small mesopores are more preferable to disperse gold nanoparticles. The addition of lanthanum oxide largely increased the dispersion of gold nanoparticles and oxygen active sites independent of the textural structure of silica support. The interaction between lanthanum oxide and silica enhanced by the synergy facilitated the release of oxygen vacancies and transition of active oxygen species. In addition, the chemical properties were greatly changed after lanthanum oxide addition which was only inconspicuously impacted by the initial textural structure of silica supports, shedding light on the further design of economic gold catalyst based on simple synthesis method.

关键词: Gold catalysis, Catalyst design, Au-metal synergy, CO oxidation

Abstract: Silica supported gold nanoparticles were synthesized and promoted by lanthanum oxide as dopant. The influences of La2O3 and silica textural structure on the gold dispersion, formation of active species, crystalline composition and the reacting role of dopants were studied in detail. The characterization results suggested that the dispersion of gold nanoparticles depended on the textural structure of silica without lanthanum oxide doping where small mesopores are more preferable to disperse gold nanoparticles. The addition of lanthanum oxide largely increased the dispersion of gold nanoparticles and oxygen active sites independent of the textural structure of silica support. The interaction between lanthanum oxide and silica enhanced by the synergy facilitated the release of oxygen vacancies and transition of active oxygen species. In addition, the chemical properties were greatly changed after lanthanum oxide addition which was only inconspicuously impacted by the initial textural structure of silica supports, shedding light on the further design of economic gold catalyst based on simple synthesis method.

Key words: Gold catalysis, Catalyst design, Au-metal synergy, CO oxidation