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Abstract
Human activities have led to a massive increase in
CO2
emissions as a primary greenhouse gas that is contributing to climate change with
higher than
1∘C
global warming than that of the pre-industrial level. We evaluate the three major
technologies that are utilised for carbon capture: pre-combustion, post-combustion
and oxyfuel combustion. We review the advances in carbon capture, storage and utilisation.
We compare carbon uptake technologies with techniques of carbon dioxide separation.
Monoethanolamine is the most common carbon sorbent; yet it requires a high regeneration
energy of 3.5 GJ per tonne of
CO2
. Alternatively, recent advances in sorbent technology reveal novel solvents such
as a modulated amine blend with lower regeneration energy of 2.17 GJ per tonne of
CO2
. Graphene-type materials show
CO2
adsorption capacity of 0.07 mol/g, which is 10 times higher than that of specific
types of activated carbon, zeolites and metal–organic frameworks.
CO2
geosequestration provides an efficient and long-term strategy for storing the captured
CO2
in geological formations with a global storage capacity factor at a Gt-scale within
operational timescales. Regarding the utilisation route, currently, the gross global
utilisation of
CO2
is lower than 200 million tonnes per year, which is roughly negligible compared with
the extent of global anthropogenic
CO2
emissions, which is higher than 32,000 million tonnes per year. Herein, we review
different
CO2
utilisation methods such as direct routes, i.e. beverage carbonation, food packaging
and oil recovery, chemical industries and fuels. Moreover, we investigated additional
CO2
utilisation for base-load power generation, seasonal energy storage, and district
cooling and cryogenic direct air
CO2
capture using geothermal energy. Through bibliometric mapping, we identified the
research gap in the literature within this field which requires future investigations,
for instance, designing new and stable ionic liquids, pore size and selectivity of
metal–organic frameworks and enhancing the adsorption capacity of novel solvents.
Moreover, areas such as techno-economic evaluation of novel solvents, process design
and dynamic simulation require further effort as well as research and development
before pilot- and commercial-scale trials.
Crystalline solids with extended non-interpenetrating three-dimensional crystal structures were synthesized that support well-defined pores with internal diameters of up to 48 angstroms. The Zn4O(CO2)6 unit was joined with either one or two kinds of organic link, 4,4',4''-[benzene-1,3,5-triyl-tris(ethyne-2,1-diyl)]tribenzoate (BTE), 4,4',44''-[benzene-1,3,5-triyl-tris(benzene-4,1-diyl)]tribenzoate (BBC), 4,4',44''-benzene-1,3,5-triyl-tribenzoate (BTB)/2,6-naphthalenedicarboxylate (NDC), and BTE/biphenyl-4,4'-dicarboxylate (BPDC), to give four metal-organic frameworks (MOFs), MOF-180, -200, -205, and -210, respectively. Members of this series of MOFs show exceptional porosities and gas (hydrogen, methane, and carbon dioxide) uptake capacities. For example, MOF-210 has Brunauer-Emmett-Teller and Langmuir surface areas of 6240 and 10,400 square meters per gram, respectively, and a total carbon dioxide storage capacity of 2870 milligrams per gram. The volume-specific internal surface area of MOF-210 (2060 square meters per cubic centimeter) is equivalent to the outer surface of nanoparticles (3-nanometer cubes) and near the ultimate adsorption limit for solid materials.
Carbon capture and storage (CCS) is vital to climate change mitigation, and has application across the economy, in addition to facilitating atmospheric carbon dioxide removal resulting in emissions offsets and net negative emissions. This contribution reviews the state-of-the-art and identifies key challenges which must be overcome in order to pave the way for its large-scale deployment. Carbon capture and storage (CCS) is broadly recognised as having the potential to play a key role in meeting climate change targets, delivering low carbon heat and power, decarbonising industry and, more recently, its ability to facilitate the net removal of CO 2 from the atmosphere. However, despite this broad consensus and its technical maturity, CCS has not yet been deployed on a scale commensurate with the ambitions articulated a decade ago. Thus, in this paper we review the current state-of-the-art of CO 2 capture, transport, utilisation and storage from a multi-scale perspective, moving from the global to molecular scales. In light of the COP21 commitments to limit warming to less than 2 °C, we extend the remit of this study to include the key negative emissions technologies (NETs) of bioenergy with CCS (BECCS), and direct air capture (DAC). Cognisant of the non-technical barriers to deploying CCS, we reflect on recent experience from the UK's CCS commercialisation programme and consider the commercial and political barriers to the large-scale deployment of CCS. In all areas, we focus on identifying and clearly articulating the key research challenges that could usefully be addressed in the coming decade.
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