Sequestra Carbonation Intelligence

sequestra FlexCo is a climate technology company headquartered in Vienna, Austria, founded in 2024 per Carbon Herald coverage. It markets itself as Carbonation Intelligence and aims to set the standard for permanent CO2 mineralisation, in which mineral residues from heavy industry react with CO2 to form stable carbonates.

Its offer follows three stages with a go/no-go decision at each gate: Measure (carbonation assessment of a material), Model (techno-economic screening across 1,000 scenarios) and Scale (demonstration trials and industrial projects). Assets include the Luma laboratory in Vienna, the Scallop 100 kg/h pre-industrial plant in Attnang-Puchheim, and the Nautilus 1,000 kg/h plant targeted for 2027.

• Luma laboratory: standardised high-throughput carbonation trials in Vienna.
• Scallop plant: continuous pre-industrial unit at 100 kg/h in operation.
• Nautilus plant: 1,000 kg/h process plant at partner sites, targeted for 2027.
• Techno-economic screening: models combining lab, site and market data.
• Staged process: Measure, Model, Scale with go/no-go gates.

Assessing steel slag from Vietnamese mills for CO2 binding capacity. Screening cement or coal-ash residues for carbonation projects. Joint demonstration trials with industrial partners.

Tests how much CO2 a given industrial residue can bind before investing in a plant. Screens project economics across 1,000 scenarios. Staged go/no-go gates limit capital risk. Site lists 500+ standardised trials, 10+ material classes and 3 patent families filed.

Heavy industry needs permanent ways to deal with process CO2 and mineral wastes such as slag and ash. Mineralisation is one route to durable carbon removal. Vietnam's steel, cement and coal power sectors generate slag and ash that could be assessed for carbonation.

Vienna, Austria (Millennium Tower), technology centre in Attnang-Puchheim. Seed round of EUR 3 million announced March 2026, led by VSE Beteiligungs-GmbH. Supported by FFG, aws and Carbon Drawdown Initiative.