Journal
ACS CATALYSIS
Volume 5, Issue 7, Pages 4255-4259Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b00682
Keywords
ammonia-evaporation method; Cu/SiO2 nanocatalyst; CO2 hydrogenation; copper phyllosilicate; Cu+ species
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Funding
- 973 Program [2011CBA00505, 2013CB933200]
- NSF of China [21403237, 21303202, 21303203]
- NSF of Fujian Province [2014J05025]
- State Key Laboratory of Supramolecular Structure and Materials [sklssm201506]
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Cu-based nanocatalysts have been widely used for CO2 hydrogenation, but their poor stability is the bottleneck for further industrial applications. A high-performance and long-lived Cu/SiO2 nanocatalyst was synthesized by an ammonia-evaporation method for CO2 hydrogenation. The conversion of CO2 reaches up to 28%, which is close to the equilibrium conversion of CO2 (30%), and the selectivity to methanol is 21.3%, which is much higher than the equilibrium selectivity (6.6%) at 320 degrees C and 3.0 MPa. Furthermore, after 120 h of evaluation, the conversion can be still maintained at a high value (27%), which is much better than a Cu/SiO2 catalyst prepared by traditional impregnation. The Cu+ species has been demonstrated to be the active component for the activation and conversion of CO2. The higher ratio of Cu+/(Cu-0 + Cu+) and interaction between the metal and support deriving from copper phyllosilicate are mainly responsible for the high catalytic activity and excellent stability, respectively.
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