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Brylewski T. Maruyama T. Nanko M. Przybylski K. 《Journal of Thermal Analysis and Calorimetry》1999,56(2):681-690
The high-temperature oxidation behavior of a ferritic alloy (SUS 430) in a SOFC environment, corresponding to the anode (H2/H2O gas mixture) and cathode (air) operating conditions, was determined with regard to application of the alloy as a metallic
separator material in SOFC. The oxidation kinetics of Fe-16Cr alloy (SUS 430), was studied by thermogravimetry in H2/H2O gas mixtures with pH/pHO=94/6 and 97/3 and in air, in the temperature range 1023-1223 K, for 3.6 up to 1080 ks. It was found that the protective oxide
scale, composed mainly of Cr2O3 with uniform thickness and excellent adhesion to the metal substrate, grows in accordance with the parabolic rate law. The
dependence of the parabolic rate constant, kp, of the scale on temperature obeys the Arrhenius equation: kp=6.8×10-4 exp (-202.3 kJ mol-1R-1T-1) for H2/H2O gas mixtures with pH/pHO=94/6. The determined kp was independent of the oxygen partial pressure in the range from 5.2×10-22 to 0.21 atm at 1073 K, which means that the rates of growth of the scale on Fe-16Cr alloy in the above-mentioned atmospheres
are comparable. The oxidation test results on Fe-16Cr alloy in H2/H2O gas mixtures and air demonstrate the applicability of SUS 430 alloys as a separator for SOFC.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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CrOx/SiO2催化剂对C10+芳烃加氢脱烷基反应的催化性能 总被引:1,自引:0,他引:1
采用等体积浸渍法制备了一系列不同组成的CrOx/SiO2催化剂样品,并用XRD,FT-IR,UV-Vis,TPR和N2吸附等技术对催化剂样品进行了表征,考察了催化剂对C10+重芳烃加氢脱烷基反应的催化性能. 结果表明,CrOx/SiO2催化剂对C10+重芳烃加氢脱烷基反应的催化性能与催化剂的表面结构有关,脱烷基活性主要来自载体表面的CrOx物种. 当催化剂中n(Cr)/n(Si)=1%~2%时,CrOx在SiO2表面达到单层分散; 当n(Cr)/n(Si)=2%~20%时,表面CrOx物种含量的变化不大,催化剂的活性及选择性基本不变. 相似文献