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Regeneration process using CO2 in situ of Ni-Y2O3-Al2O3 aerogel spent catalysts from dry reforming with continuous syngas production
Chemical Engineering Science ( IF 4.1 ) Pub Date : 2020-11-28 , DOI: 10.1016/j.ces.2020.116319
Camilla Daniela Moura-Nickel , Jessica Tatianne Ortiz Florenciano , Gidiane Scaratti , Regina de Fátima Peralta Muniz Moreira , Humberto Jorge José

Deactivation by coke deposition is one of the most important challenges during reforming processes. High active and coke resistant catalysts, Ni-Y2O3-Al2O3 aerogel, were used in dry reforming reaction and an innovative regeneration process using in situ CO2 was proposed. Results showed that the catalytic activity is recovered using in situ CO2 coke gasification at 650-700 °C. However, temperature higher than 700 °C causes deactivation by sintering. An extended test of 10 successive reforming/regeneration cycles at 700 °C was performed using a catalyst containing 2.5 wt% of Y2O3 and the catalytic activity is completely preserved. CO2 regeneration at same temperature of dry reforming proved to be an excellent alternative to conventional air oxidation reactions to remove the coke. This advantageous catalyst regeneration not only produces useful CO by reaction between coke and CO2, but also allows the maintenance of operating conditions in reactor and enables the use of greenhouse gas.



中文翻译:

Ni-Y 2 O 3 -Al 2 O 3气凝胶废催化剂的原位CO 2 干法重整制合成气的再生工艺

焦炭沉积引起的失活是重整过程中最重要的挑战之一。高重活性和耐焦炭催化剂Ni-Y 2 O 3 -Al 2 O 3气凝胶被用于干重整反应,并提出了一种利用原位CO 2的创新再生方法。结果表明,在650-700°C下使用原位CO 2焦炭气化可恢复催化活性。但是,高于700°C的温度会导致烧结失活。使用含有2.5 wt%的Y 2 O 3的催化剂在700°C下进行了10个连续重整/再生循环的扩展测试并完全保留了催化活性。事实证明,在干重整的相同温度下进行CO 2再生是常规空气氧化反应去除焦炭的绝佳替​​代方法。这种有利的催化剂再生不仅通过焦炭和CO 2之间的反应产生有用的CO ,而且还允许维持反应器中的操作条件并能够使用温室气体。

更新日期:2020-12-01
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