期刊
APPLIED CATALYSIS A-GENERAL
卷 567, 期 -, 页码 112-121出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2018.09.013
关键词
Aqueous-phase reforming; Alcohols; Hydrogen; Nickel-based catalysts; Fischer-Tropsch water fraction
资金
- Academy of Finland (AQUACAT) [285398]
- Academy of Finland (AKA) [285398, 285398] Funding Source: Academy of Finland (AKA)
Catalytic aqueous-phase reforming (APR) can be applied to process the organic compounds in the water fractions derived from the Fischer-Tropsch (FT) synthesis. This work aimed at finding an active nickel-based catalyst to convert organic compounds typically found in FT-derived waters, such as alcohols, into hydrogen. In addition, this work aimed at proposing potential reaction pathways that explain the product distribution resulting from the APR of C-1-C-3 alcohols. Solutions with 5% mass fraction of either methanol, ethanol, propan-l-ol or propan-2-ol in water were processed in APR at 230 degrees C and 3.2 MPa over different nickel-based catalysts in a continuous packed-bed reactor. Methanol was successfully reformed into hydrogen and carbon monoxide with conversions up to 60%. The conversion of C-2-C-3 alcohols achieved values in the range of 12% to 55%. The results obtained in the APR of C-2-C-3 alcohols suggest that in addition to reforming to hydrogen and carbon monoxide, the alcohols underwent dehydrogenation and decarbonylation. The most stable catalyst, nickel-copper supported on ceriazirconia, reached feedstock conversions between 20% and 60% and high hydrogen selectivity. Monometallic nickel supported on ceria-zirconia catalysts reached higher H-2 yields; however, the yield of side products, such as alkanes, was also higher over the monometallic catalysts. Accordingly, ceria-zirconia nickel-based supported catalysts constitute suitable candidates to process the alcohols in the water fractions derived from the FT synthesis.
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