Industrial waste can capture CO₂ and help make chemicals

Researchers in China say industrial by-products can be turned into materials that capture carbon dioxide at high temperatures and then help convert the gas into propylene carbonate, a useful industrial chemical. The approach could link waste recycling with carbon utilization, though the team says more testing is needed before real-world deployment.

Why it matters: - The work points to a single process that could address two industrial problems at once: solid waste and CO₂ emissions. - The approach could reduce the need to treat carbide slag and blast furnace slag as disposal burdens. - The process could also turn captured carbon into propylene carbonate, a chemical with industrial uses.

What happened: - Researchers in China published a study in Green Chemical Engineering on using industrial by-products to capture CO₂ and convert it into a useful chemical. - The team used carbide slag and blast furnace slag to make materials that capture CO₂ at high temperatures. - A preparation method using sucrose produced the most effective CO₂-capturing material.

The details: - The sucrose-based material performed better and held up through repeated heating and cooling cycles. - Under the test conditions, the material captured 0.552 grams of CO₂ per gram of sorbent at 740°C. - After 10 capture cycles, the material retained 92% of its initial CO₂-capturing capacity. - The captured CO₂ was then reacted with propylene oxide to produce propylene carbonate. - Graphene oxide and tetrabutylammonium bromide supported the reaction. - The process produced propylene carbonate with a 91% yield. - The approach could avoid compressing and transporting CO₂ before conversion into a product. - The journal said the study links industrial waste recycling with carbon capture and utilization. - The publication described Green Chemical Engineering as an international, peer-reviewed journal focused on sustainable chemistry and chemical engineering, indexed in ESCI, EI, Scopus and CSCD. - The journal said it has an Impact Factor of 11.9 (JCR Q1) and a CiteScore of 18.5. - The article is available at the full article.

Between the lines: - The key advance is not just carbon capture; it is pairing capture with immediate chemical conversion. - Using waste-derived materials could lower costs and improve the sustainability profile of the process if it scales. - The results are promising, but they come from controlled testing rather than an operating industrial plant.

What's next: - Further research will need to test the process at larger scale. - Researchers will also need to evaluate performance under real industrial conditions. - If those tests go well, the method could support more resource-efficient waste management and emissions reduction.

The bottom line: - Industrial waste may become part of the solution to CO₂ emissions, not just part of the problem.