{
    "title": "Plasmatron",
    "inventor_name": "Daniel R. Cohn",
    "publication_year": 1997,
    "device_name": "Plasmatron",
    "goal": "Reduce vehicle smog-producing emissions and improve fuel efficiency by on-board conversion of a fraction of fuel into hydrogen-rich gas.",
    "problem_addressed": "High NOx and other pollutant emissions from internal-combustion engines and dependence on foreign oil.",
    "concept_summary": "A compact, low-power plasma fuel reformer (the plasmatron) uses an electric arc to create a high-temperature plasma that rapidly converts gasoline, diesel, biocrude or vegetable-oil fuels into a hydrogen-rich gas. Adding this gas to the main fuel stream lowers combustion temperatures and reduces NOx emissions while modestly improving engine efficiency.",
    "detailed_description": "The plasmatron is roughly the size of a soup can or wine bottle and operates at < 1 kW electrical power. Fuel is injected into a discharge chamber where an electric arc ionizes the fuel and surrounding air, forming a plasma. The plasma accelerates chemical reactions, cracking hydrocarbons and producing a gas rich in hydrogen (~= 90 % conversion of the processed fuel). The hydrogen-rich gas is mixed with the unprocessed fuel and fed to the engine. Laboratory tests showed > 90 % conversion for gasoline, diesel and biocrude fuels, and engine tests demonstrated NOx reductions of up to two orders of magnitude (~= 2700 ppm -> 20 ppm). The system is designed to be inexpensive (~= $200-$300) and to use replaceable electrodes similar to spark plugs.",
    "category": "Electromagnetism & Magnetism",
    "principles": [
        "Electrical discharge plasma generation",
        "Catalyst-free fuel cracking",
        "Hydrogen enrichment of fuel stream"
    ],
    "scientific_domains": [
        "Plasma Physics",
        "Chemical Engineering",
        "Automotive Engineering"
    ],
    "mechanisms_of_action": [
        "Electric arc ionizes fuel and air -> plasma",
        "Plasma accelerates hydrocarbon reforming reactions",
        "Hydrogen-rich gas mixed with main fuel reduces combustion temperature and NOx formation"
    ],
    "materials": [
        "Tungsten (electrode material)",
        "Ceramic insulating components",
        "Metal housing (steel/aluminum)"
    ],
    "energy_sources": [
        "Electrical power (~= 1 kW)"
    ],
    "inputs": [
        "Liquid fuel (gasoline, diesel, biocrude, vegetable oil)",
        "Air (oxygen)"
    ],
    "outputs": [
        "Hydrogen-rich reformate gas",
        "Reduced NOx and other pollutant emissions"
    ],
    "claimed_performance": "Over 90 % conversion of processed fuel to hydrogen-rich gas; NOx emissions reduced from 2700 ppm to 20 ppm (~= 100x) in engine tests; 25-50 % fuel conversion can cut NOx by a factor of 5-10.",
    "experimental_evidence": "Engine-mounted plasmatron operated reliably for two weeks (4-6 h/day) with NOx drop from 2700 ppm to 20 ppm; laboratory conversion > 90 % for gasoline, diesel and biocrude.",
    "replication_status": "Device installed in a commercial car engine and operated successfully for two weeks; next step planned vehicle integration (bus prototype).",
    "keywords": [
        "plasma reformer",
        "hydrogen enrichment",
        "on-board fuel processing",
        "NOx reduction",
        "low-power plasma",
        "vehicle emissions"
    ],
    "related_technologies": [
        "Fuel reformer",
        "Plasma torch",
        "Hydrogen-enhanced combustion"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.6,
    "fringe_score": 0.2,
    "evidence_strength": 0.7,
    "risk_score": 0.2,
    "trl_estimate": 6,
    "source_urls": [
        "http://news.mit.edu/1997/plasmatron",
        "http://discovermagazine.com/1999/jul/thetenthannualdi1639",
        "https://www.eurekalert.org/pub_releases/1999-11/MIoT-Mpfc-141199.php"
    ],
    "organizations": [
        "MIT Plasma Science and Fusion Center",
        "DOE Office of Heavy Vehicle Technologies",
        "Oak Ridge National Laboratory",
        "Battelle Pacific Northwest National Laboratory"
    ],
    "applications": [
        "Vehicle emissions control",
        "On-board hydrogen production",
        "Improved fuel efficiency for cars, trucks and buses"
    ],
    "limitations": [
        "Plasmatron consumes electrical power, reducing net fuel-savings if too much fuel is processed",
        "Electrode wear requiring periodic replacement",
        "Current designs process only a fraction of total fuel flow",
        "Integration with vehicle control systems still required"
    ],
    "open_questions": [
        "Long-term durability of electrodes under automotive duty cycles",
        "Economic trade-off between electricity consumption and fuel savings at scale",
        "Performance with a wide range of biocrude and vegetable-oil fuels",
        "Optimal control strategy for fraction of fuel to reform in real-time driving conditions"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "\"We ran it reliably for four to six hours a day over two weeks, with no traces of deterioration.\" - Dr. Rabinovich",
        "\"NOx was reduced from an average 2,700 parts per million without the plasmatron to 20 ppm with the device.\" - EurekAlert release",
        "\"We've shown a very high degree of conversion (over 90 percent) of gasoline, diesel, and biocrude fuels into hydrogen-rich gas.\" - Dr. Cohn",
        "\"The plasmatron could reduce nitrogen oxide levels by a factor of five to ten relative to operation without hydrogen-rich gas.\" - MIT News",
        "\"The entire plasmatron system could cost no more than two to three hundred dollars.\" - MIT press release"
    ]
}