期刊
CATALYSTS
卷 8, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/catal8080302
关键词
diatomite; alkali oxide; dimethyl carbonate; catalysis; carbon dioxide
资金
- National Natural Science Foundation of China [21376276, 21643002]
- Guangdong Province Sci Tech Bureau [2017B090901003, 2016B010114004, 2016A050503001]
- Natural Science Foundation of Guangdong Province [2016A030313354]
- Guangzhou Sci Tech Bureau [201607010042]
- Fundamental Research Funds for the Central Universities
Alkali-adopted Cu-Ni/diatomite catalysts were designed and used for the direct synthesis of dimethyl carbonate (DMC) from carbon dioxide and methanol. Alkali additives were introduced into Cu-Ni/diatomite catalyst as a promoter because of its lower work function (Ni > Cu > Li > Na > K > Cs) and stronger electron-donating ability. A series of alkali-promoted Cu-Ni/diatomite catalysts were prepared by wetness impregnation method with different kind and different loading of alkali. The synthesized catalysts were fully characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), temperature-programmed reduction (TPR), and NH3/CO2-TPD. The experimental results demonstrated that alkali adoption can significantly promote the catalytic activity of Cu-Ni bimetallic catalysts. Under the catalytic reaction conditions of 120 degrees C and 1.0 MPa; the highest CH3OH conversion of 9.22% with DMC selectivity of 85.9% has been achieved when using 15%(2Cu-Ni) 2%Cs2O/diatomite catalyst (CuO + NiO = 15 wt. %, atomic ratio of Cu/Ni = 2/1, Cs2O = 2 wt. %).
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