A facile fabrication of a multi-functional and hierarchical Zn-based MOF as an efficient catalyst for CO2 fixation at room-temperature
- 12 May 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Inorganic Chemistry Frontiers
- Vol. 8 (12), 3085-3095
- https://doi.org/10.1039/d1qi00104c
Abstract
Carboxyl-containing and amine-rich Zn-MOF [Zn2L2MA·2DMF] (MA = melamine, H2L = 2,5-thiophenedicarboxylic acid) was facilely synthesized by a simple room-temperature stirring approach. In addition, the synthesis period was reduced to 2 h due to the organic amine of triethylamine (TEA), tripropylamine (TPA) or triamylamine (TAA) as a protonation agent, which made the fabrication of Zn-MOF both time- and energy-saving. The obtained Zn-MOF possessed hierarchical pores (labeled as Hie-Zn-MOF) and efficiently catalyzed the CO2 fixation with epoxides. The existing mesopores in Hie-Zn-MOF were beneficial for the diffusion and accessibility of substrates as well as the carbonate product, while the micropores accelerated CO2 gathering and strengthened its interaction with active sites. Hie-Zn-MOF-TEA with TEA as a protonation agent exhibited 97% yield of propene carbonate at room temperature. In particular, the catalytic activity for bulky epoxides was evidently higher than that for comparative Zn-MOF with only micropores (labeled as Mic-Zn-MOF), and the corresponding product yield was obviously improved from 64% to 88% with the butyl glycidyl ether substrate. Besides, the tentative synthesis procedure for the Hie-Zn-MOF catalyst and the feasible catalytic mechanism for CO2 fixation to epoxides are proposed. The time- and energy-saving synthesis strategy and efficient Zn-MOF catalyst are attractive in CO2 capture and CO2 chemical conversion.Keywords
Funding Information
- National Natural Science Foundation of China (21972034)
- Harbin Institute of Technology (HIT2019DX12)
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