Lamellar-Structured Silicate Derived Highly Dispersed CoCu Catalyst for Higher Alcohol Synthesis from Syngas
Zhuoshi Li, Zhiwei Hu, Zhuang Zeng, Shaoxia Guo, Jing Lv, Shouying Huang, Yue Wang, Xinbin Ma
Abstract
The direct conversion of bioderived syngas to high value-added higher alcohols (HA) is quite promising in the energy field. CoCu based catalysts show great potential for higher alcohol synthesis (HAS). However, the catalytic performance and stability still need to be improved. Herein, by using a facile ammonia evaporation method combined with ion exchange, a series of lamellar-structured CoCu bimetallic silicates were prepared and evolved into highly dispersed and close interacted CoCu active sites, which showed excellent space time yield toward HA of 15.4 mmol·gcat–1·h–1 and superior stability over 500 h. It is demonstrated that the Co0 of the CoCu alloy (or some Co particles) favored CO dissociation, while the Cu and Coδ+ of CoO and Co2SiO4 species benefited the CO nondissociative adsorption, and the appropriate cooperation of those sites led to the optimal catalytic performance in HAS. Moreover, the different Co and Cu sites can be maintained owing to the presence of the Co–O–Si structure and resulting in excellent catalyst stability. This method for preparing highly dispersed and close interacted CoCu catalysts would provide guidance for further design of high-performance CoCu catalysts for HAS.