University of Groningen Chemo-catalytic synthesis of biobased higher alcohols Xi, Xiaoying

University of Groningen

Chemo-catalytic synthesis of biobased higher alcohols Xi, Xiaoying

DOI:

10.33612/diss.133328930

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Publication date: 2020

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Citation for published version (APA):

Xi, X. (2020). Chemo-catalytic synthesis of biobased higher alcohols. University of Groningen. https://doi.org/10.33612/diss.133328930

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Propositions

Accompanying the thesis

Chemo-catalytic Synthesis of Biobased Higher Alcohols

Xiaoying Xi

1. Alcohol based fuels offer a competitive alternative for the gasoline market.

2. Conclusions regarding the active species of MoS2-based catalysts obtained by XPS

analysis are questionable, because the valence states of Mo species are a function of temperature, pressure and are sensitive to moisture and oxygen, especially after modification with K (Woo, Hee Chul, et al. Journal of Catalysis, 1992, 138.2: 525-535; Yu, Miao, et al. ACS Catalysis, 2020, 10.3: 1838-1846).

3. In-depth and systematic product analyses provide new insights in reaction mechanisms beyond existing knowledge (Chapter 2 & 3).

4. In contrast to current beliefs (Li, Zhongrui, et al. Applied Catalysis A: General, 2001, 220.1-2: 21-30), the Co9S8 phase in Co-MoSx catalysts may also contribute to obtain

improved yields of higher alcohols from syngas (Chapter 3).

5. Surprisingly, calcined SiC was shown to be catalytically active for CO2 hydrogenation

(Chapter 4).

6. Batch experiments, even when using multiple reaction-catalyst recycles, are not providing conclusive information on the extent of catalyst deactivation (Chapter 5). 7. The formation of higher alcohols requires at least two metals in close proximity

(Chapter 2-5).

8. Don’t wait until you are ready. What is required most is a brave and courageous heart. 9. The more you know, the higher the uncertainty.

10. When you are stuck, either in research or life, stand up, go for a walk and talk to others. 11. It’s interesting to read the life and career tracks of other scholars.