In:
Carbon Neutralization, Wiley, Vol. 1, No. 1 ( 2022-06), p. 14-25
Abstract:
Ketonization of carboxylic acids is valuable for bio‐oil upgrading and producing bio‐derived chemicals. Ca/AlO x metal oxides with various Ca/Al ratios have been prepared by the low‐cost and natural abundant metals in the process. The addition of alkaline or alkaline‐earth metals could significantly improve the activity of Ca/AlO x catalysts by base‐catalyzed ketonization of carboxylic acids. However, the active sites on alkaline‐metal‐doped Ca/AlO x catalysts are still under debate, and the commercialization of these catalysts often suffers from deactivation in long‐term use. Here Ca(Na)/AlO x catalysts with various Ca/Al molar ratios were prepared and evaluated for the ketonization of acetic acid. Sodium addition resulting in the formation of NaAlO 2 has higher basicity than CaO. These strong basic sites could significantly promote the ketonization of acetic acid via the thermal decomposition of carboxylates. The Ca(Na)/AlO x catalyst with NaAlO 2 populated on the surface could provide 100% acetone selectivity at the complete conversion of acetic acid at 400°C and exhibit no activity loss after a 400 h reaction, which is the most active and stable catalyst for ketonization reaction hitherto. These Ca(Na)/AlO x catalysts are also stable by adding major bio‐oil model compounds (e.g., phenol) into the reaction mixture, which are promising for future bio‐oil upgrading applications.
Type of Medium:
Online Resource
ISSN:
2769-3325
,
2769-3325
Language:
English
Publisher:
Wiley
Publication Date:
2022
Permalink