Topsoe A/S (Topsoe; formerly Haldor Topsøe) is a Danish catalysis and process technology company serving the chemical, refining, and energy sectors. The company develops and licenses industrial processes and supplies catalysts and proprietary equipment used across global production of fuels and chemicals.
Core areas include ammonia, methanol, hydrogen and syngas generation, refinery hydroprocessing and sulfur management, and emissions control. Topsoe also works on low‑carbon pathways such as blue and green ammonia and methanol, power‑to‑x and synthetic fuels, carbon capture integration, and high‑temperature solid oxide electrolyzer (SOEC) technology for hydrogen and synthesis gas. Its offerings span technology licensing, engineering, plant design, and technical services.
Founded in 1940, Topsoe operates R&D, manufacturing, and service facilities in Europe, the Americas, and Asia, supplying fertilizer, petrochemical, and fuel producers worldwide.