CCS meaning in Chemistry ?

Answer:

What is Carbon Capture and Storage mean?

Carbon capture and storage (CCS) or carbon capture and sequestration is the process of capturing carbon dioxide (CO
2) before it enters the atmosphere, transporting it, and storing it (carbon sequestration) for centuries or millennia. Usually the CO
2 is captured from large point sources, such as a chemical plant or biomass power plant, and then stored in an underground geological formation. The aim is to prevent the release of CO
2 from heavy industry with the intent of mitigating the effects of climate change. Although CO
2 has been injected into geological formations for several decades for various purposes, including enhanced oil recovery, the long-term storage of CO
2 is a relatively new concept. Carbon capture and utilization (CCU) and CCS are sometimes discussed collectively as carbon capture, utilization, and sequestration (CCUS). This is because CCS is a relatively expensive process yielding a product with an intrinsic low value (i.e. CO
2). Hence, carbon capture makes economically more sense when being combined with a utilization process where the cheap CO
2 can be used to produce high-value chemicals to offset the high costs of capture operations.

CO
2 can be captured directly from an industrial source, such as a cement kiln, using a variety of technologies; including absorption, adsorption, chemical looping, membrane gas separation or gas hydration. As of 2020, about one thousandth of global CO
2 emissions are captured by CCS. Most projects are industrial.

Storage of the CO
2 is envisaged either in deep geological formations, or in the form of mineral carbonates. Pyrogenic carbon capture and storage (PyCCS) is also being researched. Geological formations are currently considered the most promising sequestration sites. The US National Energy Technology Laboratory (NETL) reported that North America has enough storage capacity for more than 900 years worth of CO
2 at current production rates. A general problem is that long-term predictions about submarine or underground storage security are very difficult and uncertain, and there is still the risk that some CO
2 might leak into the atmosphere.

Despite carbon capture increasingly appearing in policymakers' proposals to address climate change, existing CCS technologies have significant shortcomings that limit their ability to reduce or negate carbon emissions; current CCS processes are usually less economical than renewable sources of energy and most remain unproven at scale. Opponents also point out that many CCS projects have failed to deliver on promised emissions reductions. One of the most well-known failures is the FutureGen program, partnerships between the US federal government and coal energy production companies which were intended to demonstrate ″clean coal″, but never succeeded in producing any carbon-free electricity from coal.

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