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- W2474707586 abstract "The oxidation kinetics, surface morphology and phase structure of oxide films grown on 25Cr20Ni alloy in air-H2O and H2-H2O atmospheres at 900 °C for 20 h were investigated. The anti-coking SHUIRUPDQFHDQGUHVLVWDQFHWRFDUEXUL)DWLRQRIWKHWZRR(LGH�oOPVZHUHFRPSDUHGXVLQJ���&U��1LDOOR� tubes with an inner diameter of 10 mm and a length of 850 mm in a bench scale naphtha steam pyrolysis unit. The oxidation kinetics followed a parabolic law in an air-H2O atmosphere and a logarithm law in a H2-H22�DWPRVSKHUHLQWKHVWHDG�VWDWHVWDJH��7KHR(LGH�oOPJURZQLQWKHDLU�+ 2O atmosphere had cracks where the elements Fe and Ni were enriched and the un-cracked area was covered with octahedral-shaped MnCr2O4 spinels and Cr1.3Fe0.7O3�R(LGHFOXVWHUV��ZKLOHWKHR(LGH�oOPJURZQLQWKH�+ 2-H2O atmosphere was intact and completely covered with dense standing blade MnCr2O4 spinels. In the pyrolysis tests, the DQWLFRNLQJSHUIRUPDQFHDQGUHVLVWDQFHWRFDUEXUL)DWLRQRIWKHR(LGH�oOPJURZQLQWKH�+ 2-H2O atmosphere were far better than that in the air-H22�DWPRVSKHUH��7KHPDVVRIFRNHIRUPHGLQWKHR(LGH�oOPJURZQ� in the H2-H2O atmosphere was less than 10% of that in the air-H2O atmosphere. The Cr1.3Fe0.7O3 oxide clusters converted into Cr23C6�FDUELGHVDQGWKHFUDFNVZHUH�oOOHGZLWKFDUERQLQWKHR(LGH�oOPJURZQLQ� the air-H2O atmosphere after repeated coking and decoking tests, while the dense standing blade MnCr2O4 VSLQHOVUHPDLQHGXQFKDQJHGLQWKHR(LGH�oOPJURZQLQWKH�+ 2-H2O atmosphere. The ethylene, propylene DQGEXWDGLHQH�LHOGVLQWKHSUROVLVWHVWVZHUHDOPRVWWKHVDPHIRUWKHWZRR(LGH�oOPV�" @default.
- W2474707586 created "2016-07-22" @default.
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- W2474707586 date "2014-01-01" @default.
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- W2474707586 title "3URSHUWLHVRIR(LGHøOPVJURZQRQ&U1L alloy in air-H 2 O and H 2 -H 2 O atmospheres" @default.
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