Promoter effect of La₂O₃ on gold catalyst with different textural structures

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• 作者：Huiyuan Xu^a ; ^b ; Jingjie Luo^b ; ^{jj.luo2013@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Shenying Xu^a ; Denglei Zhu^a ; Wei Chu^b ; ^{chuwei1965scu@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Gold catalysis ; Catalyst design ; Au-metal synergy ; CO oxidation
• 刊名：Journal of Energy Chemistry
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：25
• 期：5
• 页码：854-860
• 全文大小：2980 K

文摘

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.