Radiolytic desorption tests of a series of carbon samples containing KI 3 , KI, triethylenediamine (TEDA), or combinations of TEDA and KI showed that a 10 x 16 mesh coconut shell carbon containing 1% TEDA, 2% KI,and a proprietary flame retardant retained iodine better than all products tested except those containing higher TEDA concentrations.Ignition temperature measurements on the same series of samples showed that the 1% TEDA -2% KI product has an ignition temperature of about 330°C under SRP flow conditions (the same as the KI3 carbon). The 1% TEDA -2% KI carbon has been selected to replace the unimpregnated carbon currently used in the Savannah River reactor confinement system.-2 -
CONTENTS
The decarboxylation pathway in ethanol steam reforming ultimately favors higher selectivity to hydrogen over the decarbonylation mechanism. The addition of an optimized amount of Cs to Pt/m-ZrO2 catalysts increases the basicity and promotes the decarboxylation route, converting ethanol to mainly H2, CO2, and CH4 at low temperature with virtually no decarbonylation being detected. This offers the potential to feed the product stream into a conventional methane steam reformer for the production of hydrogen with higher selectivity. DRIFTS and the temperature-programmed reaction of ethanol steam reforming, as well as fixed bed catalyst testing, revealed that the addition of just 2.9% Cs was able to stave off decarbonylation almost completely by attenuating the metallic function. This occurs with a decrease in ethanol conversion of just 16% relative to the undoped catalyst. In comparison with our previous work with Na, this amount is—on an equivalent atomic basis—just 28% of the amount of Na that is required to achieve the same effect. Thus, Cs is a much more efficient promoter than Na in facilitating decarboxylation.
Radiolytic desorption tests of a series of carbon samples containing KI 3 , KI, triethylenediamine (TEDA), or combinations of TEDA and KI showed that a 10 x 16 mesh coconut shell carbon containing 1% TEDA, 2% KI,and a proprietary flame retardant retained iodine better than all products tested except those containing higher TEDA concentrations.Ignition temperature measurements on the same series of samples showed that the 1% TEDA -2% KI product has an ignition temperature of about 330°C under SRP flow conditions (the same as the KI3 carbon). The 1% TEDA -2% KI carbon has been selected to replace the unimpregnated carbon currently used in the Savannah River reactor confinement system.-2 -
CONTENTS
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