Adsorption Synthesis of Iron Oxide-Supported Gold Catalyst under Self-Generated Alkaline Conditions for Efficient Elimination of Carbon Monoxide

• Main Authors: Feng Pan, Weidong Zhang, Yuxiao Ye, Yixuan Huang, Yanzhe Xu, Yufeng Yuan, Feng Wu, Jinjun Li
• Format: Article
• Language: English
• Published: MDPI AG 2018-08-01
• Series: Catalysts
• Subjects: adsorption; iron oxide; gold; carbon monoxide; catalytic oxidation
• Online Access: http://www.mdpi.com/2073-4344/8/9/357

Goethite- and hematite-supported highly dispersed gold catalysts for carbon monoxide oxidation were synthesized by gold precursor adsorption onto the support materials in self-generated alkaline solutions. The support materials were prepared by reacting iron nitrate with excess sodium hydroxide. The residual minor alkali incorporated into the support could provide suitable alkaline conditions at approximately pH 8 for the hydrolysis of tetrachloroaurate anions and the subsequent adsorption process. Gold species underwent autoreduction to achieve activation during the synthesis. An increase in pH or temperature to 80 °C decreased the gold loading of the catalysts. The optimal catalysts could achieve complete oxidation of carbon monoxide at −20 °C.