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Catalytic Production and Utilization of Green Hydrogen for the Conversion of Carbon-Containing Molecules /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Catalytic Production and Utilization of Green Hydrogen for the Conversion of Carbon-Containing Molecules // Kevin Kristian Turaczy.
作者:	Turaczy, Kevin Kristian,
面頁冊數:	1 electronic resource (172 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-09, Section: B.
Contained By:	Dissertations Abstracts International86-09B.
標題:	Chemical engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31843597
ISBN:	9798310147607

Catalytic Production and Utilization of Green Hydrogen for the Conversion of Carbon-Containing Molecules /
Turaczy, Kevin Kristian,

Catalytic Production and Utilization of Green Hydrogen for the Conversion of Carbon-Containing Molecules /Kevin Kristian Turaczy. - 1 electronic resource (172 pages)

Source: Dissertations Abstracts International, Volume: 86-09, Section: B.

Given the current policies in place, the world is not on track to achieve net-zero emissions by the year 2050 as greenhouse gas (GHG) emissions continue to rise. Though fossil fuels are heavily linked to GHG emissions, they are a staple in both energy applications and chemical production. Reducing the barriers associated with producing fossil fuel alternatives, such as hydrogen (H2), will allow society to shift towards net-zero emissions and mitigate anthropogenic driven climate change. At present the majority of H2 is produced from fossil fuels, making H2 production from water electrolysis (green H2), which can be GHG emissions free, an attractive solution. This dissertation studies alternative electrocatalysts for the production of green H2 that traditionally rely on materials that are scarce, expensive, and associated with relatively large GHG emissions. Furthermore, this work explores applications where green H2 can be impactful in reducing GHG emissions such as in the upcycling of polyethylene and in the sequestration of biogas into useful solid materials.First, Pt- and Pd-modified molybdenum nitride (Mo2N) was explored as an alternative for the traditional Pt electrocatalyst in the hydrogen evolution reaction (HER) for water electrolysis. Hydrogen binding energy (HBE) has been used as a descriptor for potential electrocatalysts and in Chapter 3, the HBE of both Pt- and Pd-modified Mo2N was determined experimentally using temperature-programmed desorption (TPD). This was then correlated with electrochemical measurements in both acidic and alkaline electrolyte. The established trend revealed that the similar activity of Pt/Mo2N, in both media, to Pt(111) is linked to their similar HBE values. Density functional theory (DFT) calculations further verified the trends established in this chapter and provided insight into the electronic structure of these modified Mo2N surfaces. In Chapter 4, the binding strength of two more Pt-modified transition metal nitride (TMN) surfaces, titanium nitride and vanadium nitride, were explored for their potential use as electrocatalysts in green H2 production. The desorption of H2O from Pt-modified titanium nitride and tantalum nitride were also studied to understand their binding affinity to H2O, which is an important factor in alkaline HER.Second, the tunability of the product distribution for polymer upcycling was investigated in Chapter 5. Low-density polyethylene (LDPE) was converted using H2, via hydrogenolysis, into smaller hydrocarbon products with bimetallic RuM3/CeO2 (M = Fe, Ni, Co) catalysts. The formation of bimetallic alloys resulted in a shift in product distribution, away from unwanted methane (CH4) and towards longer chain, value-added products. X-ray absorption fine structure measurements, electron microscopy imaging, and H2 temperature-programmed reduction were used to characterize the catalysts. Furthermore, n-hexadecane was included as a model compound for polyolefins to determine the effects of H2 pressure and reaction time on the product distribution. Of the three bimetallic catalysts, RuCo3/CeO2 was the most promising and was capable of suppressing C-C bond scission of shorter chain alkanes into CH4.Lastly, Chapter 6 reports the successful conversion of biogas (CH4 and CO2) into syngas (CO and H2) followed by carbon nanofiber (CNF) formation using a tandem reactor. This work combined a non-thermal plasma reactor, which can be easily integrated with renewable electricity, for the breakdown of biogas and a thermal reactor, operating at relatively mild temperatures (450°C), to convert syngas into CNF. Different parameters were varied to determine their impact on CNF formation and biogas conversion. Higher residence times, which were achieved using lower total flow rates and longer plasma lengths, resulted in more CNF growth compared to lower residence times. The production of C2 and C3 alkanes and alkenes were also reported as side products from the plasma-assisted conversion of biogas. Chapter 7 highlighted future applications of TPD and non-thermal plasma in H2 production and utilization as well as suggestions for improving the work presented in this dissertation.

English

ISBN: 9798310147607Subjects--Topical Terms:

560457
Chemical engineering.
Subjects--Index Terms:

Biogas

Catalytic Production and Utilization of Green Hydrogen for the Conversion of Carbon-Containing Molecules /
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