Design and fabrication of an automated temperature programmed reaction system to evaluate 3-way catalysts Ce1−x−y ,(La/Y) x Pt y O2−δ
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A completely automated temperature-programmed reaction (TPR) system for carrying out gas-solid catalytic reactions under atmospheric flow conditions is fabricated to study CO and hydrocarbon oxidation, and NO reduction. The system consists of an all-stainless steel UHV system, quadrupole mass spectrometer SX200 (VG Scientific), a tubular furnace and micro-reactor, a temperature controller, a versatile gas handling system, and a data acquisition and analysis system. The performance of the system has been tested under standard experimental conditions for CO oxidation over well-characterized Ce1−−x−y Ptx(La/Y)yO2-δ catalysts. Testing of 3-way catalysis with CO, NO and C2H2 to convert to CO2, N2 and H2O is done with this catalyst which shows complete removal of pollutants below 325°C. Fixed oxide-ion defects in Pt substituted Ce1−y (La/Y) y O2−y/2 show higher catalytic activity than Pt ion-substituted CeO2.
KeywordsAutomatic TPR ceria, three way catalysis
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