Siluria Technologies

Market position

Siluria positioned itself against conventional ethylene production, which globally is made by cracking naphtha or ethane; Forbes cited estimates of a worldwide ethylene market of about $150 billion a year and noted a wave of multi-billion-dollar US Gulf Coast ethane cracker construction by ChevronPhillips, Sasol, OxyChem and ExxonMobil. Its demonstration plant produced about one ton of ethylene per day against world-scale plants at 4,000 tons per day or more, so it remained far from displacing incumbent routes. Alternative gas-monetization approaches it was compared with include LNG (e.g., Qatari investment, Cheniere Energy's liquefaction build-out) and Fischer-Tropsch gas-to-liquids plants such as Shell's Pearl GTL and Sasol's Oryx.

Siluria's claimed differentiators were a catalyst enabling direct methane-to-ethylene conversion at temperatures low enough to avoid combustion of the feedstock and to stop the reaction at ethylene rather than CO2 and water — a problem earlier industrial efforts (including work by CEO Ed Dineen's former team at ARCO, where catalysts reportedly lasted only a day) had failed to solve; a two-stage pathway (OCM plus ethylene-to-liquids) from raw gas to finished fuels; and compatibility with existing petrochemical infrastructure. Management claimed the process, deployed at an existing refinery, could generate a 40% rate of return with oil at $40 per barrel and 100% at $90, versus Fischer-Tropsch economics that the CEO said 'just doesn't make money' at $50 oil.

Technology

The core technology was Oxidative Coupling of Methane: methane and oxygen react exothermically over a proprietary nanowire catalyst to form ethylene and water in a single step (2 CH4 + O2 -> C2H4 + 2 H2O + heat), generating methyl radicals that couple to ethane, which is then dehydrogenated to ethylene. This avoids syngas intermediates and high-temperature pyrolysis, but the general OCM route faces selectivity and yield limits from competing complete oxidation to CO and CO2. A complementary Ethylene to Liquids process converted ethylene into gasoline, diesel or jet fuel. Catalyst development drew on nanomaterials, viral/biological templating and chemical engineering, and the technology was designed for integration into existing plants or modular deployment.

Go-to-market

Siluria pursued commercialization through technology licensing and strategic partnerships with incumbent chemical and energy companies rather than building its own merchant plants. Reported relationships include Saudi Aramco (strategic investor and, via Saudi Aramco Technologies, a 2018 multi-plant OCM licensee), Braskem (host of the La Porte demonstration unit) and Linde. Its demonstration facility served both as a technical scale-up step and as evidence for prospective licensees.

Chemical and energy producers, refiners and petrochemical operators seeking lower-cost ethylene and fuel production from methane, including owners of stranded or flared natural gas such as in the Permian and Bakken basins.

Geography

Headquartered in San Francisco, California (reported address 409 Illinois Street), with a pilot plant near San Francisco, a test run that produced gasoline in Hayward, California, and a commercial demonstration plant in La Porte, Texas, co-located within a Braskem America polypropylene site on the Houston Ship Channel.

History

Sources differ on the founding year: Wikipedia and one aggregator profile state 2007, while Grokipedia and another aggregator section state 2008; Lux Capital records its investment in 2007, and a Forbes article describes Clinton Bybee of Arch Venture Partners as a co-founder in 2009. Early proof-of-concept work using viral templating to produce nanowires was reported by 2010. The company operated a pilot plant near San Francisco, then in April 2015 started up a methane-to-ethylene demonstration plant co-located at a Braskem America site in La Porte, Texas; a test run had produced gasoline in Hayward, California in August 2014. In June 2018 it signed a multi-plant OCM license with Saudi Aramco Technologies. In July 2019 McDermott International acquired Siluria's assets and intellectual property for an undisclosed sum. After McDermott's 2020 bankruptcy, the Lummus division — including Siluria's IP and the La Porte demonstration plant — was spun off, with Lummus Technology holding the assets.

Risks & controversies

Sources report conflicting basic facts (founding year 2007 vs. 2008 vs. a 2009 co-founding reference; total funding variously reported as over $100 million, $120 million, $166.0 million and $172.8 million; one aggregator lists an implausible 10,000+ employee count), so figures should be treated with caution. Technically, OCM is described as constrained by selectivity (targeting >50%) and yield (often 20-30% in practice) because of competing full oxidation to CO and CO2. Commercially, the demonstration unit's one-ton-per-day capacity was orders of magnitude below world-scale crackers, and the company faced entrenched low-cost ethane cracking capacity and competing gas-monetization routes. The eventual acquisition by McDermott and the subsequent transfer of assets through McDermott's bankruptcy indicate the company did not reach independent commercial scale.