A company in "Carbon Dioxide Capture at Source" primarily focuses on reducing carbon dioxide emissions, a major greenhouse gas, from specific sources such as power plants and industrial processes. Common methods include pre-combustion capture, post-combustion capture, and oxy-fuel combustion. The carbon dioxide is then stored or used in a way that it will not enter the atmosphere, for instance, for enhanced oil recovery or transformed into other substances or products. In essence, they are working to mitigate the negative impacts of carbon dioxide emissions on climate change.

1. Post-combustion Capture: This involves capturing CO2 after the combustion of fossil fuels, when the carbon dioxide is present in diluted flue gases. This method uses a chemical solvent to absorb the CO2 before it’s released into the atmosphere.

2. Pre-combustion Capture: This method involves transforming the fossil fuel into a gaseous mixture of hydrogen and carbon dioxide prior to its combustion. The CO2 is then separated and the hydrogen is used in a variety of processes, including electricity generation.

3. Oxy-fuel Combustion: This system uses oxygen instead of air for combustion, resulting in a stream of CO2 and water vapor that can be easily separated.

4. Chemical Looping Combustion (CLC): This method involves the use of metal oxide particles to produce a pure stream of CO2 that can be captured.

5. Calcium Looping: In this process, limestone is heated to produce lime, which reacts with the CO2 in the flue gas to trap it.

6. Direct Air Capture: This method captures CO2 directly from the ambient air, rather than from the point source, achieving carbon-negative emissions.

7. Bio-energy with Carbon Capture and Storage (BECCS): This method involves the use of biomass for energy production and capturing the resulting CO2.

8. Enhanced Oil Recovery (EOR): This involves capturing CO2 and injecting it into oil reservoirs to increase oil recovery.

9. Industrial Carbon Capture: This process captures CO2 directly from industrial processes, such as cement production, steel making, and chemical manufacturing.

1. Carbon Mineralization: This process involves the capture of CO2 and its conversion into carbonates that can be stored or used for construction materials.

11. Membrane Separation: This technique utilizes a membrane material that acts as a filter to separate the carbon dioxide from other gases.

12. Cryogenic Separation: This process involves the cooling and liquefaction of gas to separate out carbon dioxide.

Decarbonization refers to the reduction of greenhouse gas emissions, primarily carbon dioxide (CO2), in order to mitigate climate change. Carbon Dioxide Capture at Source, also known as Carbon Capture and Storage (CCS), is a technology that helps achieve decarbonization by capturing the CO2 emissions produced from the use of fossil fuels in electricity generation and industrial processes.

This captured CO2 is then transported and securely stored underground so that it does not enter the atmosphere. In some cases, the captured CO2 can also be used, such as in enhanced oil recovery (EOR).

There are several ways this capture at the source helps with decarbonization:

1. Reduction of Emissions: CCS can capture up to 9% of the CO2 emissions produced from the use of fossil fuels in industrial processes, preventing them from entering the atmosphere.

2. Flexibility: It can be applied to existing power plants and industrial facilities, as well as to new facilities.

3. Complementing Other Technologies: CCS can work in conjunction with other low-carbon technologies to achieve decarbonization.

4. Enabling Negative Emissions: When CCS is used with biomass energy generation (BECCS - bioenergy with CCS), it has potential to result in negative emissions by removing CO2 from the atmosphere.

These factors make Carbon Dioxide Capture at Source an important tool in addressing climate change and working towards the goal of decarbonization. However, for CCS to be implemented at a large scale, it requires substantial investment and development of specialized infrastructure, and needs to overcome various regulatory and public acceptance hurdles.

Choosing a vendor to help you capture carbon dioxide at source can be a critical step in decarbonizing your company. Here is a guideline that may help in this process:

1. Understand Your Needs: It's crucial to first analyse your company's specific needs and goals, such as the amount of carbon dioxide you produce, the types of machinery or processes you use that emit CO2, and your ultimate emissions reduction targets. Are you only focused on CO2 or other gases as well?

2. Research Options: Look into the available options for carbon capture vendors. Begin by doing a basic online search, looking through trade publications, and asking for recommendations from businesses in your industry who have already made this transition.

3. Evaluate Technology: Different vendors will offer different technology mechanisms for carbon capture. Some may specialize in Post-combustion capture, some might use Oxy-fuel combustion method while others might have carbon mineralization technologies. Choose a technology that fits best with your current operation to minimize implementation disruptions.

4. Vendor Reputation: Look for vendors who have a good reputation in the market, it is ideal if the vendor had helped similar businesses like yours to reduce their carbon footprint. Check the vendor's testimonials or ask them for case studies to look into their market credibility.

5. Cost Consideration: Evaluate the costs provided by vendors. This includes the initial set-up costs, ongoing maintenance costs, and expected savings from reductions in carbon emissions. Do not only consider the cheapest option but also the most efficient and reliable one.

6. Support and Maintenance: Check the kind of after-sale support that the vendors provide. This could include regular check-ups, immediate assistance for any malfunction, and regular upgrades.

7. Implementation Timeline: Consider the timeframe within which the vendor can successfully implement the technology.

8. Regulatory Compliance: The vendor must be well-versed in regional and international compliance and regulations related to carbon capture.

9. Consult an Expert: If this is not your field of expertise, you might want to consult an environmental engineer or a sustainability consultant to help you in your decision-making process.

1. Request for Proposal (RFP): Once you have all needed Information, either a detailed bid document, which sets out your requirements and the evaluation criteria for selection, could be made or meet the vendors directly to understand their capability.

Always remember to consider the long-term effects of your decisions. An effective carbon capture and storage system may have higher upfront costs, but it could save you money in the long run and will surely contribute positively to your corporate sustainability goals.