Sulfur Detection for Logistic Fuel-Based Fuel Cell Generators

Ion Optics proposes to develop a MEMS based, non-dispersive infrared (NDIR) spectroscopic instrument to measure the sulfur content of the hot gas stream feed for the fuel cell. Prototype laboratory instruments have demonstrated the specificity and sensitivity of this technique to measure the carbon monoxide concentration in 100,aC phosphoric acid fuel-cell feeds from reformed gasoline under conditions that caused rapid failure of all electrochemical sensors. This Phase 1 research will demonstrate detection of sulfur at sub-25ppm levels at 400,aC in less than one second using NDIR technology. Test gases will include feed stock with appropriate potential interferents (CO, CO2, H2O, and hydrocarbons). Ion Optics is developing a prototype MEMS device for NDIR spectroscopy that combines the functions of light source, detector and optical filter onto one chip. Phase I results and specifications will define the necessary modifications to the chip for detecting low-concentrations of sulfur in high-temperature reformed-fuel streams. Optimized MEMS devices would be available for use in Phase 2 deliverables for Air Force testing.