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Citation: Zifei Yuan, Zhankun Gao, Bo-Qing Xu. Acid-base property of the supporting material controls the selectivity of Au catalyst for glycerol oxidation in base-free water[J]. Chinese Journal of Catalysis, ;2015, 36(9): 1543-1551. doi: 10.1016/S1872-2067(15)60936-6 shu

Acid-base property of the supporting material controls the selectivity of Au catalyst for glycerol oxidation in base-free water

1.
Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China

Corresponding author: Bo-Qing Xu,
Received Date: 22 April 2015
Available Online: 19 June 2015
Fund Project: 国家自然科学基金(21221062) (21221062) 国家重点基础研究发展计划(973计划, 2013CB933103). (973计划, 2013CB933103)

Glycerol (GL) valorization by catalytic aerobic oxidation in water over Au-based catalysts usually produces a number of products. A soluble base (usually NaOH) is often added to the reaction solution to promote GL activation and affect the product distribution. We report in this study the support effect on the catalysis of Au nanoparticles (NPs) for GL oxidation in base-free water on a series of supporting MgO-Al₂O₃ materials. The acid-base property on the surfaces of these MgO-Al₂O₃ supports were systematically varied by tuning the molar Mg/Al ratio (x) before they were loaded with the catalytic Au NPs. Au NPs on the most acidic and least basic MgO-Al₂O₃ exhibited the highest activity for GL activation and the highest selectivity for dihydroxyacetone (DHA) production. Increasing the surface basicity or lowering the acidity of the MgO-Al₂O₃ support results in continuously improved selectivity for glyceric acid (GLA) but lowered the selectivity for DHA. These correlations disclose for the first time that the support acid-base property inversely affects the formation of DHA and GLA, and demonstrate that the support acidity/basicity is a key to the selectivity control of their carrying Au NPs for GL oxidation.
- Glycerol valorization,
- Selective oxidation,
- Gold catalyst,
- Acid-base property,
- Selectivity control,
- Catalyst support effect
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