Towards Stable Catalysts for Aqueous Phase Conversion of Ethylene Glycol for Renewable Hydrogen

Koichumanova, Kamila; Vikla, Anna Kaisa Kristiina; Vlieger, Dennis de; Seshan, Kulathuiyer; Mojet, Barbara; Lefferts, Leon

doi:10.1002/cssc.201300445

Cited by 47 publications

(43 citation statements)

References 25 publications

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“…10c). The STEM images are consistent with previous studies that showed the encapsulation of metal particles by boehmite after APR reaction [66,67]. As a result of alumina phase collapse, the accessible metal surface area of Pt/Al 2 O 3 -8 decreased by 60% from 0.47 m 2 /g to 0.19 m 2 /g after the fourth recycle.…”

Section: F Liu Et Alsupporting

confidence: 90%

Silica deposition as an approach for improving the hydrothermal stability of an alumina support during glycerol aqueous phase reforming

Liu

Okolie

Ravenelle

et al. 2018

Applied Catalysis A: General

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A B S T R A C TSilica deposition on the benchmark aqueous phase reforming (APR) catalyst Pt/γ-Al 2 O 3 is studied to prevent or limit hydrolytic attack of the support under hydrothermal APR conditions, for which boehmite formation by support hydration is a known cause for catalyst deactivation. Tetraethyl orthosilicate (TEOS) is employed as a silicon source in a straightforward liquid-phase, silylation process followed by catalyst calcination and reduction. Characterization by X-ray diffraction, temperature-programmed desorption of NH 3 , infrared, 27 Al nuclear magnetic resonance and X-ray photoelectron spectroscopy of the fresh catalysts suggests that silica addition occurs preferentially on the support surface, resulting in weak Brønsted acid sites as well as in the formation of Si-O-Al linkages at the expense of specific surface Lewis acid sites. Silylation and calcination of Pt/γ-Al 2 O 3 causes partial blockage of the metal surface area (12% loss), whereas γ-Al 2 O 3 surface silica modification prior to Pt deposition makes controlled metal deposition difficult. Catalytic performance tests show the overcoated samples to be active in the APR of 5 wt% glycerol, albeit with lower H 2 production rates compared to the benchmark catalyst. Characterization of spent APR catalysts clearly demonstrates that silylation/calcination treatments effectively slows down the transformation of the γ-Al 2 O 3 support due to the formation of a Si-O-Al interface. Overall, the lifetime of the catalyst is increased three-fold as a result of the surface overcoating treatment, with repetitive recycling ultimately leading to loss of the protective silica layer.

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Section: F Liu Et Alsupporting

confidence: 90%

Silica deposition as an approach for improving the hydrothermal stability of an alumina support during glycerol aqueous phase reforming

Liu

Okolie

Ravenelle

et al. 2018

Applied Catalysis A: General

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“…On the other hand, APR over Pt supported on boehmite has showed stable, higher activity than Pt/g-Al 2 O 3 in some studies. Consequently, boehmite can be chosen as an efficient support of Pt with high activity for H 2 formation due to the extensively hydroxylated surface of boehmite and effective oxidation of platinum [33,60].…”

Section: Hydrogen Formationmentioning

confidence: 99%

A review of catalytic aqueous-phase reforming of oxygenated hydrocarbons derived from biorefinery water fractions

Coronado

Stekrova

Reinikainen

et al. 2016

International Journal of Hydrogen Energy

139

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“…Powder XRD shows only subtle differences between the steamed (St-OAl) and fresh (OAl) series (Fig. S6), as features emerge at 39 and 49 o , suggesting a small quantity of pseudo-boehmite has formed [53][54][55]. The pore volume, surface area ( Fig.…”

Section: Steaming Of Bare Supportsmentioning

confidence: 99%

Exploring steam stability of mesoporous alumina species for improved carbon dioxide sorbent design

et al. 2019

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Many different metrics exist to assess the efficacy of a carbon capture sorbent, though one of the pivotal characteristics is stability on regeneration, most notably steam stability, which applies to steam stripping regeneration, a technique proposed for capture of CO2 from humid flue gas. In this study the steam stability of two different mesoporous alumina species is compared, with an aim to tune the synthesis methodology, and the local structure and crystallinity of the samples, to create a stable regenerable sorbent. The roles of calcination temperature and aminopolymer impregnation on sorbent stability and structure are also investigated using a wide range of characterization techniques to specifically probe the influence of the alumina support. We show through this study that support choice, and support stability, can play an important role in sorbent design for carbon capture. We highlight that regular crystallinity (such as in γ-alumina), hinders the formation of pseudo-boehmite, retaining its CO2 uptake. Further we show that the addition of aminopolymers (PEI) can facilitate phase changes, however maintains the mesoporosity of the sample, a key metric for CO2 uptake.

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Towards Stable Catalysts for Aqueous Phase Conversion of Ethylene Glycol for Renewable Hydrogen

Cited by 47 publications

References 25 publications

Silica deposition as an approach for improving the hydrothermal stability of an alumina support during glycerol aqueous phase reforming

Silica deposition as an approach for improving the hydrothermal stability of an alumina support during glycerol aqueous phase reforming

A review of catalytic aqueous-phase reforming of oxygenated hydrocarbons derived from biorefinery water fractions

Exploring steam stability of mesoporous alumina species for improved carbon dioxide sorbent design

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