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By Gerald Ondrey |

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Fe-free HTS catalyst Last month at the Nitrogen + Syngas 2016 conference (Berlin, Germany; February 29–March 3), Haldor Topsøe A/S (Lyngby, Denmark; www.topsoe.com) introduced SK-501 Flex, a new high-temperature shift (HTS) catalyst with the unique ability to operate at any steam-to-carbon ratio, allowing producers to achieve record plant efficiency in ammonia, hydrogen and synthesis gas (syngas) production. “Producers get unique flexibility with SK-501 Flex, because it takes away the minimum steam-to-carbon requirement imposed by conventional HTS catalysts,” says Johan Jönsson, product manager at Topsøe. Without changing production setup, the producer can choose to keep production at its current level, but save on feedstock and energy costs — or boost production by up to 5%. For a large-scale NH3 plant, the improvement in revenue is approximately $11 million/yr, or $57 million over a typical catalyst lifetime,” says Jönsson. Instead of iron, the SK-501 Flex formulation is based on zinc oxide and zinc aluminum spinel that has been known to catalyze the water-gas shift reaction. The iron-free formulation of SK-501 Flex prevents formation of unwanted iron carbides that reduce the catalyst strength of conventional Fe-based…
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