A novel nanoporous composite containing micrographitic carbon layers is synthesized by preliminarily expanding the interlayer of an oxidized product of graphite using surfactant, followed by Si bridging/pillaring, and carbonization.
Ammonia
has been proposed as a promising energy carrier and is
expected to play a resilient and sustainable role in future energy
scenarios. Energy systems critically impact biogeological carbon and
nitrogen cycles. Thus, carbon and nitrogen footprints are two important
indicators of sustainability for energy systems. In the present study,
we explored the optimal supply pathway and identified impact hotspots
by investigating the carbon footprint associated with greenhouse gas
emissions and the nitrogen footprint associated with reactive nitrogen
emissions from the ammonia energy system. Four scenarios (Japan to
Japan, JP–JP; Australia to Japan, AU–JP; Chile to Japan,
CL–JP; Saudi Arabia to Japan, SA–JP) were modeled based
on international relations and energy distribution between these countries.
Compared with the Japan electricity mix, it is a win–win situation
under scenario JP–JP from the perspective of carbon and nitrogen
footprints, while trade-offs were identified under the scenarios AU–JP
and CL–JP. SA–JP performed worse in both carbon and
nitrogen footprints. Improvement of key processes is critical to mitigate
greenhouse gas and reactive nitrogen emissions. When the efficiency
of partial oxidation increased by 25% in SA–JP, the carbon
and nitrogen footprint decreased by 17% and 8%, respectively. This
evaluation relayed information on the sustainable use of ammonia as
an energy carrier by examining the relative impacts on both carbon
and nitrogen footprints.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.