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University of Texas – Austin

1. Seraj, Sarah. Synthesis of palladium-gold alloy nanoparticle catalysts for the reduction of nitrite in water.

Degree: MSin Engineering, Environmental and Water Resources Engineering, 2016, University of Texas – Austin

Hydrogenation using palladium-based (Pd-based) catalysts has emerged as a promising treatment method for nitrate in drinking water. However, low catalytic activity and longevity can be a barrier to widespread adoption over conventional treatment methods. Controlling catalyst structure at the molecular scale is one approach to improving catalytic activity and longevity. Intermetallic palladium-gold nanoparticle (PdAu NP) alloy catalysts of varying composition were synthesized for nitrite reduction using a polyol reduction method and microwave-assisted heating. The average size of PdAu NPs was 4.1 ± 2.2 nm. Enhanced nitrite reduction has been previously observed for Pd combined with Au in a core-shell NP structure, but has not been studied for intermetallic PdAu alloy NPs. Moreover, the mechanism by which Au enhances Pd-catalyzed nitrite reduction is not well understood. The PdAu NPs were loaded into an amorphous silica support and evaluated for nitrite reduction in a batch reactor. Reaction followed pseudo first-order kinetics for greater than 80% of conversion. Catalyst activity showed volcano-like behavior with varying composition .... All PdAu alloys were significantly more active for nitrite reduction compared to pure Pd NPs, despite Au being catalytically inactive for hydrogenation. Sulfide fouling and catalyst longevity studies were conducted. The presence of Au in the catalyst structure did not appear to enhance resistance to sulfide fouling. Moreover, catalyst activity was reduced upon repeated cycles of nitrite reduction. Further investigation is required to understand the mechanism for catalyst deactivation. Advisors/Committee Members: Werth, Charles J. (advisor), Humphrey, Simon M. (advisor).

Subjects/Keywords: Hydrogenation; Bimetallic nanoparticle catalysts; Palladium; Noble metals; Nitrate; Nitrite; Drinking water treatment; Microwave-assisted heating

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Seraj, S. (2016). Synthesis of palladium-gold alloy nanoparticle catalysts for the reduction of nitrite in water. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68234

Chicago Manual of Style (16th Edition):

Seraj, Sarah. “Synthesis of palladium-gold alloy nanoparticle catalysts for the reduction of nitrite in water.” 2016. Masters Thesis, University of Texas – Austin. Accessed June 02, 2020. http://hdl.handle.net/2152/68234.

MLA Handbook (7th Edition):

Seraj, Sarah. “Synthesis of palladium-gold alloy nanoparticle catalysts for the reduction of nitrite in water.” 2016. Web. 02 Jun 2020.

Vancouver:

Seraj S. Synthesis of palladium-gold alloy nanoparticle catalysts for the reduction of nitrite in water. [Internet] [Masters thesis]. University of Texas – Austin; 2016. [cited 2020 Jun 02]. Available from: http://hdl.handle.net/2152/68234.

Council of Science Editors:

Seraj S. Synthesis of palladium-gold alloy nanoparticle catalysts for the reduction of nitrite in water. [Masters Thesis]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/68234

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