# Mantel

> Mantel is a Cambridge, Massachusetts cleantech company building a molten-salt approach to industrial carbon capture. Spun out of MIT in 2022, its molten borate materials operate inside the high-temperature guts of boilers, kilns and furnaces, absorbing more than 95% of CO2 while recovering high-grade heat that offsets the energy cost of capture. The pitch is blunt: cut the cost of capturing a ton of carbon by more than half and make it work in the dirtiest, hottest corners of heavy industry - cement, steel, pulp and paper, power and refining.

- **Founded:** 2022
- **Headquarters:** Cambridge, Massachusetts, United States
- **Founders:** Cameron Halliday (Co-founder & CEO), Sean Robertson (Co-founder & CTO), Danielle Rapson (Co-founder & COO)
- **Team size:** ~45 employees
- **Products:** Molten borate carbon capture, Heat-recovering capture system, Industrial integration
- **Notable:** Spun out of MIT's Department of Chemical Engineering in 2022, Raised a $30M Series A co-led by Shell Ventures and Eni Next (September 2024), Demonstrated >95% CO2 capture with near-zero degradation across 50, 100 and 1,000 cycles

## Products & services

- **Molten borate carbon capture** — Lithium-sodium ortho-borate molten salts that absorb CO2 at the high temperatures inside industrial equipment, capturing over 95% of CO2 with near-zero material degradation across 1,000+ cycles.
- **Heat-recovering capture system** — A capture system that recovers high-grade heat released during CO2 absorption and turns it into steam, offsetting regeneration energy and reducing capture cost by more than half versus conventional amine-based systems.
- **Industrial integration** — Capture units designed to bolt onto boilers, kilns and furnaces across cement, steel, pulp and paper, power, oil and gas refining and data centers.

## Achievements

- Spun out of MIT's Department of Chemical Engineering in 2022
- Raised a $30M Series A co-led by Shell Ventures and Eni Next (September 2024)
- Demonstrated >95% CO2 capture with near-zero degradation across 50, 100 and 1,000 cycles
- Scaled from a shoebox prototype to a shipping-container-sized operating system
- Signed a deployment partnership with Kruger Inc. in Quebec

## Latest updates

- **2025-11** — MIT News profiled Mantel's molten borate technology and its progress toward commercial-scale deployment.
- **2025-04** — Most recent recorded funding activity per company records.
- **2024-09** — Closed $30M Series A co-led by Shell Ventures and Eni Next to scale industrial carbon capture.

## Links

- Website: https://mantelcapture.com
- LinkedIn: https://www.linkedin.com/company/mantelcapture

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Profile page: https://yespress.io/mantel
Published by YesPress — https://yespress.io
Last updated: 2026-06-07