Zeolite catalysts for nitric oxide production
Abstract
This thesis considers the nitric oxide production from a range of zeolite catalysts with
either acid or copper active sites. The aim of the research was to find potential candidates
for stent coatings that could help to prevent stent thrombosis.
Acid site mordenite, ferrierite, SSZ-13 and ZSM-5 are studied in chapter 4 for the catalytic
conversion of sodium nitrite to nitric oxide. All zeolites successfully produced nitric oxide,
with ranging levels of conversion from 14 – 24 %. Recycled samples revealed the
consumption of the acid site, rendering the acid site zeolites non-catalytic.
Copper site zeolites were considered in chapters 5 and 6, with copper mordenite,
ferrierite, SSZ-13, ZSM-5 and UZM-4 being studied. All zeolites successfully converted
sodium nitrite to nitric oxide, with SSZ-13, ZSM-5 and UZM-4 producing around 100 %
conversion. The use of cysteine as a sacrificial reductant to activate the copper sites
allowed catalytic nitric oxide production. The promising catalytic tests led to further
studies of the materials, including copper leaching and toxicology.
Chapter 6 looked further into the catalytic copper zeolites with nitric oxide flow studies
and polymer incorporation. Flow studies showed sustained levels of nitric oxide
production. Incorporation of the zeolite powders into the polymer of intrinsic
microporosity, EATB(Me), showed good nitric oxide production from the initial studies.
Recycled samples, however, showed a drop in production.
Lastly, chapter 7 explored the use of the ADOR (Assembly-Disassembly-Organisation-
Reassembly) process to generate a series of zeolites for catalysis. Aluminium was
incorporated into zeolites IPC-2, 4 and 6 through the organisation step to create
aluminated zeolites. The aforementioned zeolites, as well as Al-UTL, were assessed for
nitric oxide production with acid active sites. The results showed an interesting relation
between ring size and nitric oxide production, with the largest rings of Al-UTL having the
highest production and the smallest rings of Al-IPC-4 having the lowest.
Type
Thesis, PhD Doctor of Philosophy
Collections
Description of related resources
Zeolite catalysts for nitric oxide production (Thesis data) Russell, S., University of St Andrews, 2020. DOI: https://doi.org/10.17630/d62c8236-0b6f-4d2d-9e79-227d7e8e2d5dRelated resources
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