Aqueous-phase reforming of Fischer-Tropsch alcohols over nickel-based catalysts to produce hydrogen: Product distribution and reaction pathways

Coronado, Irene; Pitínová, Martina; Karinen, Reetta; Reinikainen, Matti; Puurunen, Riikka L.; Lehtonen, Juha

doi:10.1016/j.apcata.2018.09.013

Cited by 20 publications

(16 citation statements)

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“…Furthermore, low yields of alkanes such as CH 4 , and no aldehydes indicate low activity of the applied catalyst in the hydrogenation of carbon oxides, and dehydrogenation and decarbonylation of alcohols. This differs from the reaction pathways previously reported for the APR of model alcohols for the same catalyst [24]. This difference could be attributed to the influence of molecular interactions on the reaction pathway due to competitive adsorption on the active sites of the catalyst.…”

Section: Kinetic Experimentscontrasting

confidence: 93%

“…In a previous work [24], solutions of individual model compounds such as MeOH or PrOH with 5 wt.% concentration were processed in APR over a similar NiCu/25CeZr catalyst, as applied in this work. At 230 • C, 3.2 MPa and WHSV of 80 h −1 , the APR of MeOH resulted in a conversion of 40% and the APR of PrOH resulted in a conversion of 20%.…”

Section: Kinetic Experimentsmentioning

confidence: 99%

“…For that purpose, the APR of water from a real FT process, which included organic compounds such as C 1 -C 4 alcohols, was conducted over a copper-doped nickel catalyst supported on ceria-zirconia at different operating conditions. This catalyst was selected because of its relatively good stability under APR conditions and because of its selectivity towards a limited number of H 2 producing reactions, previously reported by Coronado et al [24]. The results of the APR experiments at different pressures, temperatures and space velocities were utilized to develop a kinetic model for the APR of FT water.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Modelling of the Aqueous-Phase Reforming of Fischer-Tropsch Water over Ceria-Zirconia Supported Nickel-Copper Catalyst

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In the Fischer–Tropsch (FT) synthesis, a mixture of CO and H2 is converted into hydrocarbons and water with diluted organics. This water fraction with oxygenated hydrocarbons can be processed through aqueous-phase reforming (APR) to produce H2. Therefore, the APR of FT water may decrease the environmental impact of organic waters and improve the efficiency of the FT process. This work aimed at developing a kinetic model for the APR of FT water. APR experiments were conducted with real FT water in a continuous packed-bed reactor at different operating conditions of temperature (210–240 °C), pressure (3.2–4.5 MPa) and weight hourly space velocity (WHSV) (40–200 h−1) over a nickel-copper catalyst supported on ceria-zirconia. The kinetic model considered C1-C4 alcohols as reactants, H2, CO, CO2 and CH4 as the gaseous products, and acetic acid as the only liquid product. The kinetic model included seven reactions, the reaction rates of which were expressed with power law equations. The kinetic parameters were estimated with variances and confidence intervals that explain the accuracy of the model to estimate the outlet liquid composition resulting from the APR of FT water. The kinetic model developed in this work may facilitate the development of APR to be integrated in a FT synthesis process.

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Section: Kinetic Experimentscontrasting

confidence: 93%

Section: Kinetic Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetic Modelling of the Aqueous-Phase Reforming of Fischer-Tropsch Water over Ceria-Zirconia Supported Nickel-Copper Catalyst

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“…More recently, nickel catalysts have received attention for example in biomass gasification, not only because of their low price compared to noble metals, but also because they are highly active in tar cracking and reforming [46]. Nickel can be used for CO 2 hydrogenation on silica-supported catalysts [47] and aqueous phase reforming of alcohols on zirconia containing supports [48]. In general, ZrO 2 is considered as an attractive catalyst support due to its high thermal stability and amphoteric nature [49].…”

Section: Introductionmentioning

confidence: 99%

Nickel Supported on Mesoporous Zirconium Oxide by Atomic Layer Deposition: Initial Fixed-Bed Reactor Study

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Atomic layer deposition (ALD) is gaining attention as a catalyst preparation method able to produce metal (oxide, sulphide, etc.) nanoparticles of uniform size down to single atoms. This work reports our initial experiments to support nickel on mesoporous zirconia. Nickel (2,2,6,6-tetramethyl-3,5-heptanedionate) 2 [Ni(thd) 2 ] was reacted in a fixed-bed ALD reactor with zirconia, characterised with BET surface area of 72 m 2 /g and mean pore size of 14 nm. According to X-ray fluorescence measurements, the average nickel loading on the top part of the support bed was on the order of 1 wt%, corresponding to circa one nickel atom per square nanometre. Cross-sectional scanning electron microscopy combined with energy-dispersive spectroscopy confirmed that in the top part of the fixed support bed, nickel was distributed throughout the zirconia particles. X-ray photoelectron spectroscopy indicated the nickel oxidation state to be two. Organic thd ligands remained complete on the surface after the Ni(thd) 2 reaction with zirconia, as followed with diffuse reflectance infrared Fourier transform spectroscopy. The ligands could be fully removed by oxidation at 400 °C. These initial results indicate that nickel catalysts on zirconia can likely be made by ALD. Before catalytic testing, in addition to increasing the nickel loading by repeated ALD cycles, optimization of the process parameters is required to ensure uniform distribution of nickel throughout the support bed and within the zirconia particles.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Hydrogen production from renewable sources such as poplar (Susmozas et al, 2016) or willow wood (González-García et al, 2012), sugar cane (Halleux et al, 2008), sweet potato (Costa et al, 2018), sorghum (Aguilar-Sánchez et al, 2018) or sugar beet (Luo et al, 2009) have been investigated as the first actions to achieve a significant reduction of environmental impacts (Salkuyeh et al, 2018). Hydrogen can be obtained from different feedstocks through steam reforming (Braga et al, 2016;López et al, 2019;Zheng et al, 2019), autothermal reforming (Khila et al, 2017;Spallina et al, 2018;Xue et al, 2017) and aqueous phase reforming (Coronado et al, 2018;Esteve-Adell et al, 2017;García et al, 2018), among them, steam reforming is the most common and has the highest conversion efficiency (Haryanto et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Environmental implications of biohydrogen based energy production from steam reforming of alcoholic waste

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Feijoo

Chica

et al. 2019

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Nowadays, there is an increasing demand for energy in the world. With an energy system still based on fossil fuels, a paradigm shifts towards clean energy production based on available renewable resources is necessary. Hydrogen is a high-quality energy carrier that can be used with great efficiency and is expected to acquire a great importance in the next generation of fuels. This study aims to analyze the potential environmental impacts associated with the steam reforming of alcoholic waste from distilleries to produce clean electricity by using the Life Cycle Assessment methodology. The main findings from this study reported that the global environmental profile is better than other alternatives more common as sanitary landfill or incineration. In terms of some impact categories as Abiotic and Ozone Depletion, Acidification and Eutrophication, steam reforming of alcoholic waste performed better profiles than other processes that produce hydrogen from diverse feedstocks.

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Aqueous-phase reforming of Fischer-Tropsch alcohols over nickel-based catalysts to produce hydrogen: Product distribution and reaction pathways

Cited by 20 publications

References 42 publications

Kinetic Modelling of the Aqueous-Phase Reforming of Fischer-Tropsch Water over Ceria-Zirconia Supported Nickel-Copper Catalyst

Kinetic Modelling of the Aqueous-Phase Reforming of Fischer-Tropsch Water over Ceria-Zirconia Supported Nickel-Copper Catalyst

Nickel Supported on Mesoporous Zirconium Oxide by Atomic Layer Deposition: Initial Fixed-Bed Reactor Study

Environmental implications of biohydrogen based energy production from steam reforming of alcoholic waste

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