Thermal Stability of Perovskite-Based Monolithic Reactors in the Catalytic Combustion of Methane
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- 作者：Stefano Cimino ; Raffaele Pirone ; and Gennaro Russo
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2001
- 出版时间：January 10, 2001
- 年：2001
- 卷：40
- 期：1
- 页码：80 - 85
- 全文大小：277K
- 年卷期：v.40,no.1(January 10, 2001)
- ISSN：1520-5045
文摘
Perovskite-based monolithic reactors have been studied for methane catalytic combustion.Monoliths have been prepared by washcoating cordierite honeycomb substrates with lanthanum-stabilized 
-Al2O3, on which LaMnO3 is dispersed. Scanning electron microscopy analysis showeda homogeneous distribution of LaMnO3 on the washcoat, which, after repeated aging cycles at1100 
C, is still well anchored to cordierite. The catalytic activity in methane combustion isvery promising, even higher than that measured on the corresponding catalyst powders withthe same chemical composition. Isothermal catalytic activity measurements reveal that the firstaging cycle slightly reduces the activity of fresh catalyst, while further repeated aging treatmentsdo not deactivate the monolithic reactor. In autothermal conditions, the monolithic catalyst isable to ignite a mixture of CH4 (3% vol) and O2 (10%) at an inlet gas temperature of about 500C, giving complete methane conversion and negligible CO and NOx emissions. Moreover, 50 hof operation under ignited conditions causes only minor deactivation of the catalyst.
-Al2O3, on which LaMnO3 is dispersed. Scanning electron microscopy analysis showeda homogeneous distribution of LaMnO3 on the washcoat, which, after repeated aging cycles at1100 C, is still well anchored to cordierite. The catalytic activity in methane combustion isvery promising, even higher than that measured on the corresponding catalyst powders withthe same chemical composition. Isothermal catalytic activity measurements reveal that the firstaging cycle slightly reduces the activity of fresh catalyst, while further repeated aging treatmentsdo not deactivate the monolithic reactor. In autothermal conditions, the monolithic catalyst isable to ignite a mixture of CH4 (3% vol) and O2 (10%) at an inlet gas temperature of about 500C, giving complete methane conversion and negligible CO and NOx emissions. Moreover, 50 hof operation under ignited conditions causes only minor deactivation of the catalyst.