Selective hydrodeoxygenation of biomass-derived model compounds over bifunctional catalysts / Tianqi Chen.

Format:

Book

Thesis/Dissertation

Author/Creator:

Chen, Tianqi, author.

Contributor:

Vohs, John M., degree supervisor.

University of Pennsylvania. Department of Chemical and Biomolecular Engineering, degree granting institution.

Language:

English

Subjects (All):

Chemical engineering.

Alternative energy.

Molecular chemistry.

Chemical and biomolecular engineering--Penn dissertations.

Penn dissertations--Chemical and biomolecular engineering.

Local Subjects:

Chemical engineering.

Alternative energy.

Molecular chemistry.

Chemical and biomolecular engineering--Penn dissertations.

Penn dissertations--Chemical and biomolecular engineering.

Genre:

Academic theses.

Physical Description:

1 online resource (127 pages)

Contained In:

Dissertations Abstracts International 82-11B.

Place of Publication:

[Philadelphia, Pennsylvania] : University of Pennsylvania ; Ann Arbor : ProQuest Dissertations & Theses, 2021.

Language Note:

English

System Details:

Mode of access: World Wide Web.

text file

Summary:

The negative social and environmental impacts from burning of fossil fuels motivated the development of renewable and sustainable sources for the production of electricity such as wind and solar. Lignocellulosic biomass has emerged as a promising feedstock for carbon-based fuels and chemicals and much research effort has recently been directed at developing efficient catalytic pathways for the upgrading of lignin-derived oxygenate into useful products. This dissertation aimed to study the viability of utilizing bifunctional catalysts consisting of a transition metal either supported on or modified by a reducible metal oxide to promote the direct C-O bond cleavage in aromatic oxygenates (m-cresol). Surface science techniques such as HREELS, XPS and TPD were used to provide insights into the reaction pathway and mechanism of this reaction. In all studies featured in this thesis, transition metals such as Pt and Ni, exhibit moderate selectivity to desired product, toluene. It was found that the strong interaction between aromatic rings and metal surfaces facilitates the ring hydrogenation which forms an intermediate pool. While metal catalysts promoted by WOx and NbOx are extremely active and selective for the direct deoxygenation reaction. The interaction at the metal-metal oxide interfaces helps keep the metal oxide partially reduced and provide the active bonding sites for the adsorption of hydroxyl groups. It was also found that the I-cresol tends to adsorb on oxygen vacancies while the aromatic rings are tilted away from the surface. This bonding configuration would promote the direct deoxygenation of hydroxyl group.

Notes:

Source: Dissertations Abstracts International, Volume: 82-11, Section: B.

Advisors: Vohs, John M.; Committee members: Raymond Gorte; Aleksandra Vojvodic; Karen Goldberg.

Department: Chemical and Biomolecular Engineering.

Ph.D. University of Pennsylvania 2021.

Local Notes:

School code: 0175

ISBN:

9798738618659

Access Restriction:

Restricted for use by site license.

This item must not be sold to any third party vendors.