Consequences of MgO activation procedures on its catalytic performance for acetone self-condensation

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• 作者：Marta Le贸n ; Laura Faba ; Eva D铆az ; Simona Bennici ; Aurelio Vega ; Salvador Ord贸帽ez ; Aline Auroux
• 关键词：Basic materials ; Brucite&ndash ; periclase transitions ; CO2 adsorption ; Hydromagnesite ; Acetone condensation ; Biomass upgrading
• 刊名：Applied Catalysis B: Environmental
• 出版年：5 April, 2014
• 年：2014
• 卷：147
• 期：Complete
• 页码：796-804
• 全文大小：2449 K

文摘

A new procedure for increasing surface area and basicity of MgO has been developed in this work, leading to a tailored catalyst for the self-condensation of acetone. The preparation method, consisting on the hydration/dehydration of periclase, was optimized varying the activation procedures. The effect of the precursor (magnesium oxide or magnesium carbonate) and the thermal treatment on the morphological properties and the basic sites distribution was characterized. In particular, CO₂ calorimetry data attributed the increase of basic sites mainly to the increase in surface area. The material was tested for the base-catalyzed self-condensation of acetone, obtaining high conversions and selectivities towards the products of most industrial value, the isophorones. The selectivity reached to trimers at 723 K was almost 50%, and towards isophorones, of more than 30%.