Structural evolution of molybdenum carbides in hot aqueous environments and impact on low-temperature hydroprocessing of acetic acid

Choi, Jae -Soon; Schwartz, Viviane; Santillan-Jimenez, Eduardo; Crocker, Mark; Lewis, Sr., Samuel A.; Lance, Michael J.; Meyer, III, Harry M.; More, Karren L.

doi:10.3390/catal5010406

Title: Structural evolution of molybdenum carbides in hot aqueous environments and impact on low-temperature hydroprocessing of acetic acid

Journal Article · Fri Mar 13 00:00:00 EDT 2015 · Catalysts

DOI:https://doi.org/10.3390/catal5010406· OSTI ID:1185780

Choi, Jae -Soon ^[1]; Schwartz, Viviane ^[1]; Santillan-Jimenez, Eduardo ^[2]; Crocker, Mark ^[2]; Lewis, Sr., Samuel A. ^[1]; Lance, Michael J. ^[1]; Meyer, III, Harry M. ^[1]; More, Karren L. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research

In this paper, we investigated the structural evolution of molybdenum carbides subjected to hot aqueous environments and their catalytic performance in low-temperature hydroprocessing of acetic acid. While bulk structures of Mo carbides were maintained after aging in hot liquid water, a portion of carbidic Mo sites were converted to oxidic sites. Water aging also induced changes to the non-carbidic carbon deposited during carbide synthesis and increased surface roughness, which in turn affected carbide pore volume and surface area. The extent of these structural changes was sensitive to the initial carbide structure and was lower under actual hydroprocessing conditions indicating the possibility of further improving the hydrothermal stability of Mo carbides by optimizing catalyst structure and operating conditions. Mo carbides were active in acetic acid conversion in the presence of liquid water, their activity being comparable to that of Ru/C. Finally, the results suggest that effective and inexpensive bio-oil hydroprocessing catalysts could be designed based on Mo carbides, although a more detailed understanding of the structure-performance relationships is needed, especially in upgrading of more complex reaction mixtures or real bio-oils.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office; University of Kentucky, Lexington, KY (United States)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185780

Journal Information:: Catalysts, Vol. 5, Issue 1; ISSN 2073-4344

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
molybdenum carbide
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biomass
bio-oil
pyrolysis oil
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acetic acid hydrogenation
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Title: Structural evolution of molybdenum carbides in hot aqueous environments and impact on low-temperature hydroprocessing of acetic acid

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