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Food waste is a growing global issue that exemplifies an unsustainable system of resource loss in landfills which eventually breaks down into the greenhouse gas of methane. Approaching landfill diversion of food waste on the local level requires innovative solutions based on public and private partnerships. This thesis project explored

Food waste is a growing global issue that exemplifies an unsustainable system of resource loss in landfills which eventually breaks down into the greenhouse gas of methane. Approaching landfill diversion of food waste on the local level requires innovative solutions based on public and private partnerships. This thesis project explored how the City of Tempe's Grease Cooperative could provide a model of restaurant partnership and third-party service to tackle not just restaurant grease waste in water, but food waste in the solid waste stream. This used other city-run food waste collection systems as examples, and it relied on the input and support of multiple municipal stakeholders in its design. Using an existing food waste collection service in the Phoenix metropolitan area, the research was collected during a month-long observational pilot study of four Tempe restaurants, where data ranged from trash bin differences to kitchen staff sizes. The results of the pilot were compiled for the benefit of the collection service, the City of Tempe, and the involved restaurants to demonstrate potential obstacles to a currently small, but scalable, collection service, and potential solutions that will make the service more efficient and attractive to new customers. Future research goals include expanding the pilot's reach and information through stronger partnerships and collaborative data collection in Tempe, providing a guide to a food waste collection cooperative within Tempe, and promoting large scale diversion of food waste from restaurants both through prevention and nutrient recycling. The final paper was submitted for publication to the Solutions journal, as an example of "On the Ground" implementation of solutions.
ContributorsAndersen, Annika Emmaline (Author) / Cloutier, Scott (Thesis director) / Eakin, Hallie (Committee member) / School of Historical, Philosophical and Religious Studies (Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
Description
This honors thesis is focused on two separate catalysis projects conducted under the mentorship of Dr. Javier Pérez-Ramírez at ETH Zürich. The first project explored ethylene oxychlorination over supported europium oxychloride catalysts. The second project investigated alkyne semihydrogenation over nickel phosphide catalysts. This work is the subject of a publication

This honors thesis is focused on two separate catalysis projects conducted under the mentorship of Dr. Javier Pérez-Ramírez at ETH Zürich. The first project explored ethylene oxychlorination over supported europium oxychloride catalysts. The second project investigated alkyne semihydrogenation over nickel phosphide catalysts. This work is the subject of a publication of which I am a co-author, as cited below.

Project 1 Abstract: Ethylene Oxychlorination
The current two-step process for the industrial process of vinyl chloride production involves CuCl2 catalyzed ethylene oxychlorination to ethylene dichloride followed by thermal cracking of the latter to vinyl chloride. To date, no industrial application of a one-step process is available. To close this gap, this work evaluates a wide range of self-prepared supported CeO2 and EuOCl catalysts for one-step production of vinyl chloride from ethylene in a fixed-bed reactor at 623 773 K and 1 bar using feed ratios of C2H4:HCl:O2:Ar:He = 3:3 6:1.5 6:3:82 89.5. Among all studied systems, CeO2/ZrO2 and CeO2/Zeolite MS show the highest activity but suffer from severe combustion of ethylene, forming COx, while 20 wt.% EuOCl/γ-Al2O3 leads to the best vinyl chloride selectivity of 87% at 15.6% C2H4 conversion with complete suppression of CO2 formation and only 4% selectivity to CO conversion for over 100 h on stream. Characterization by XRD and EDX mapping reveals that much of the Eu is present in non-active phases such as Al2Eu or EuAl4, indicating that alternative synthesis methods could be employed to better utilize the metal. A linear relationship between conversion and metal loading is found for this catalyst, indicating that always part of the used Eu is available as EuOCl, while the rest forms inactive europium aluminate species. Zeolite-supported EuOCl slightly outperforms EuOCl/γ Al2O3 in terms of total yield, but is prone to significant coking and is unstable. Even though a lot of Eu seems locked in inactive species on EuOCl/γ Al2O3, these results indicate possible savings of nearly 16,000 USD per kg of catalyst compared to a bulk EuOCl catalyst. These very promising findings constitute a crucial step for process intensification of polyvinyl chloride production and exploring the potential of supported EuOCl catalysts in industrially-relevant reactions.

Project 2 Abstract: Alkyne Semihydrogenation
Despite strongly suffering from poor noble metal utilization and a highly toxic selectivity modifier (Pb), the archetypal catalyst applied for the three-phase alkyne semihydrogenation, the Pb-doped Pd/CaCO3 (Lindlar catalyst), is still being utilized at industrial level. Inspired by the very recent strategies involving the modification of Pd with p-block elements (i.e., S), this work extrapolates the concept by preparing crystalline metal phosphides with controlled stoichiometry. To develop an affordable and environmentally-friendly alternative to traditional hydrogenation catalysts, nickel, a metal belonging to the same group as Pd and capable of splitting molecular hydrogen has been selected. Herein, a simple two-step synthesis procedure involving nontoxic precursors was used to synthesize bulk nickel phosphides with different stoichiometries (Ni2P, Ni5P4, and Ni12P5) by controlling the P:Ni ratios. To uncover structural and surface features, this catalyst family is characterized with an array of methods including X-ray diffraction (XRD), 31P magic-angle nuclear magnetic resonance (MAS-NMR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Bulk-sensitive techniques prove the successful preparation of pure phases while XPS analysis unravels the facile passivation occurring at the NixPy surface that persists even after reductive treatment. To assess the characteristic surface fingerprints of these materials, Ar sputtering was carried out at different penetration depths, reveling the presence of Ni+ and P-species. Continuous-flow three-phase hydrogenations of short-chain acetylenic compounds display that the oxidized layer covering the surface is reduced under reaction conditions, as evidenced by the induction period before reaching the steady state performance. To assess the impact of the phosphidation treatment on catalytic performance, the catalysts were benchmarked against a commercial Ni/SiO2-Al2O3 sample. While Ni/SiO2-Al2O3 presents very low selectivity to the alkene (the selectivity is about 10% at full conversion) attributed to the well-known tendency of naked nickel nanoparticles to form hydrides, the performance of nickel phosphides is highly selective and independent of P:Ni ratio. In line with previous findings on PdxS, kinetic tests indicate the occurrence of a dual-site mechanism where the alkyne and hydrogen do not compete for the same site.

This work is the subject of a publication of which I am a co-author, as cited below.

D. Albani; K. Karajovic; B. Tata; Q. Li; S. Mitchell; N. López; J. Pérez-Ramírez. Ensemble Design in Nickel Phosphide Catalysts for Alkyne Semi-Hydrogenation. ChemCatChem 2019. doi.org/10.1002/cctc.201801430
ContributorsTata, Bharath (Author) / Deng, Shuguang (Thesis director) / Muhich, Christopher (Committee member) / Chemical Engineering Program (Contributor, Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
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Description
As a cause of negative economic, societal, and environmental effects, food waste is increasingly being seen as a sustainability issue that needs to be addressed. Reduction of food waste is preferred to recycling because it reduces the financial burden and technological innovations needed to address the issue. While there are

As a cause of negative economic, societal, and environmental effects, food waste is increasingly being seen as a sustainability issue that needs to be addressed. Reduction of food waste is preferred to recycling because it reduces the financial burden and technological innovations needed to address the issue. While there are many different approaches to reduce food waste, this paper investigates dynamic social norms as an avenue for reducing food waste. Recent studies showcased the effectiveness of using dynamic social norms to reduce meat consumption and the use of to-go cups. However, there appears to be a gap in research that investigates the impact of dynamic social norms in U.S. university community dining settings. This study piloted the use of dynamic social norms to intervene in post-consumer food waste behaviors at Arizona State University. Specifically, this study compared food waste amounts in a location with and without an intervention tool as well as conducted interviews to monitor any self-reported behavior change. Results show that dynamic social norms can promote behavior change in terms of food waste when compared to a control location without the intervention. Further, this study advocates for monitoring food habits through both quantitative and qualitative analysis in order to identify potential behavior changes that could not be captured to the same extent by a mono-methodological approach.
ContributorsCampbell, Hailey Paige (Author) / Fischer, Daniel (Thesis director) / Auustin-Behravesh, Shirley-Ann (Committee member) / School of Sustainability (Contributor, Contributor) / Watts College of Public Service & Community Solut (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05
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Description
As recent statistics from the U.S. Food & Drug Administration (FDA) show, “in the United States, food waste is estimated at between 30-40 percent of the food supply…at the retail and consumer levels, correspond[ing] to approximately 133 billion pounds and $161 billion worth of food in 2010” (“Food Loss and

As recent statistics from the U.S. Food & Drug Administration (FDA) show, “in the United States, food waste is estimated at between 30-40 percent of the food supply…at the retail and consumer levels, correspond[ing] to approximately 133 billion pounds and $161 billion worth of food in 2010” (“Food Loss and Waste | FDA”, 2020). Not only is excess food waste an economic problem for numerous companies, it’s unsustainable and inefficient when there could be the potential for learning and implementing innovative solutions, both on a large and small scale. The research from this creative project will focus on comparing The Walt Disney Company’s current food waste sustainability practices at Walt Disney World in Orlando, Florida, with Arizona State University’s (ASU’s) local Aramark Catering Services practices and initiatives throughout the Tempe campus’ dining halls. Specifically, the thesis will explore the benefits of anaerobic digesters and The Walt Disney Company’s use of anaerobic digesters at their Walt Disney World Parks and Resorts as a central means of converting food waste material into renewable natural gas. It will also explore Aramark’s current food waste management processes, specifically composting with the City of Phoenix’s industrial-grade composting yard, and the potential for implementing anaerobic digestion via a partnership with the City of Mesa into or in place of their current processes on ASU’s Tempe campus in the future.
ContributorsNagy, Billie Isabella (Author) / Burns, Kevin (Thesis director) / Cloutier, Scott (Committee member) / Dean, W.P. Carey School of Business (Contributor, Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2020-12
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Description
Food waste is a significant problem in many developed nations, especially the United States. Each year millions of pounds of uneaten or partially eaten food scraps are thrown into landfill, where it degrades anaerobically, producing methane gas emissions, contributing to foul odors, and contributing to an unsustainable food system. This

Food waste is a significant problem in many developed nations, especially the United States. Each year millions of pounds of uneaten or partially eaten food scraps are thrown into landfill, where it degrades anaerobically, producing methane gas emissions, contributing to foul odors, and contributing to an unsustainable food system. This thesis project set out to conduct a small-scale composting system that diverted would-be food waste from a local food bank to a community garden, where food scraps would decompose into compost to then be turned into a valuable, nutrient-rich amendment in that local garden. Engaging with this food bank and community garden allowed us to leverage the existing relationship between the two, and experiment and develop a framework that would demonstrate the feasibility of a long-term composting system in this community. By conducting this project throughout 2021, we saw where strategies worked well, what challenges remained, and where future opportunities could be expanded on. In the end, we diverted over 2000 lbs of uneaten food away from the food bank and into our composting system. We concluded our project report by providing a set of actionable recommendations and future framework guidelines that could be used by the local community garden in the future or be referenced to by other interested parties.
ContributorsBardon, Lee (Author) / Marshall, Meghan (Co-author) / Nelson, Melissa (Thesis director) / Winburn, Morgan (Committee member) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2021-12
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Description
Food waste is a significant problem in many developed nations, especially the United States. Each year millions of pounds of uneaten or partially eaten food scraps are thrown into landfill, where it degrades anaerobically, producing methane gas emissions, contributing to foul odors, and contributing to an unsustainable food system. This

Food waste is a significant problem in many developed nations, especially the United States. Each year millions of pounds of uneaten or partially eaten food scraps are thrown into landfill, where it degrades anaerobically, producing methane gas emissions, contributing to foul odors, and contributing to an unsustainable food system. This thesis project set out to conduct a small-scale composting system that diverted would-be food waste from a local food bank to a community garden, where food scraps would decompose into compost to then be turned into a valuable, nutrient-rich amendment in that local garden. Engaging with this food bank and community garden allowed us to leverage the existing relationship between the two, and experiment and develop a framework that would demonstrate the feasibility of a long-term composting system in this community. By conducting this project throughout 2021, we saw where strategies worked well, what challenges remained, and where future opportunities could be expanded on. In the end, we diverted over 2000 lbs of uneaten food away from the food bank and into our composting system. We concluded our project report by providing a set of actionable recommendations and future framework guidelines that could be used by the local community garden in the future or be referenced to by other interested parties.
ContributorsMarshall, Meghan (Author) / Bardon, Lee (Co-author) / Nelson, Melissa (Thesis director) / Winburn, Morgan (Committee member) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2012-12