Study on the performance of F-T component modified KCuZrO2 catalyst for CO hydrogenation to isobutanol

Autor: Shaopeng Tian, Ying-quan Wu, Nana Gong, Hongjuan Xie, Liyan Wang, Yisheng Tan, Hui-jun Wang
Rok vydání: 2020
Předmět:
Zdroj: Journal of Fuel Chemistry and Technology. 48:302-310
ISSN: 1872-5813
DOI: 10.1016/s1872-5813(20)30013-x
Popis: KCuZrO2 catalysts modified with different F-T elements (Fe, Co, Ni) were prepared by co-precipitation method and then were tested for isobutanol synthesis from catalytic CO hydrogenation. The catalysts were characterized by N2 adsorption and desorption experiments (BET), XRD, TEM, XPS, H2-TPR, CO-TPD and in-situ DRIFTS. The results showed that the addition of F-T components promoted the formation of ethanol and propanol, and had different effects on the selectivity of isobutanol. The characterization results showed that Fe promoted the dispersion of catalyst components, and enriched the active component Cu on the catalyst surface, which improved the active adsorption of H2 and CO. In addition, more C1 species were formed on the KFeCuZrO2 catalyst surface, and these C1 species could further react with ethanol and propanol to produce isobutanol. However, the catalysts modified by Co and Ni lacked sufficient C1 species, so the selectivity of isobutanol did not increase significantly. The introduction of Co had little effect on the structure of catalyst and the dispersion of Cu, but the activity of catalyst decreased after Co addition, which might be due to the deactivation of catalyst. After adding Ni to the catalyst, the specific surface area decreased and the particle size increased, and the Cu/Zr molar ratio on the catalyst surface also decreased to 0.19. The interaction between Cu-Zr was weakened, and the isobutanol selectivity was also reduced.
Databáze: OpenAIRE
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