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Al2O3-Coated Ni/CeO2 nanoparticles as coke-resistant catalyst for dry reforming of methane
Catalysis Science & Technology ( IF 5 ) Pub Date : 2020-11-02 , DOI: 10.1039/d0cy01615b Euiseob Yang 1, 2, 3, 4 , Eonu Nam 1, 2, 3, 4 , Jihyeon Lee 1, 2, 3, 4 , Hojeong Lee 1, 2, 3, 4 , Eun Duck Park 4, 5, 6, 7 , Hankwon Lim 1, 2, 3, 4 , Kwangjin An 1, 2, 3, 4
Catalysis Science & Technology ( IF 5 ) Pub Date : 2020-11-02 , DOI: 10.1039/d0cy01615b Euiseob Yang 1, 2, 3, 4 , Eonu Nam 1, 2, 3, 4 , Jihyeon Lee 1, 2, 3, 4 , Hojeong Lee 1, 2, 3, 4 , Eun Duck Park 4, 5, 6, 7 , Hankwon Lim 1, 2, 3, 4 , Kwangjin An 1, 2, 3, 4
Affiliation
Nickel is considered an economically feasible catalyst for the dry reforming of methane (DRM) owing to its high activity. Because the highly endothermic DRM requires a high reaction temperature to activate both CH4 and CO2, deactivation of the Ni catalyst may be induced by sintering and carbon coking. To mitigate catalyst deactivation, Ni/CeO2 catalysts composed of monodisperse Ni nanoparticles supported on CeO2 nanorods are designed and coated with Al2O3 layers by atomic layer deposition (ALD). The performance of the catalyst in DRM and amount of carbon deposited are correlated with the thickness of the Al2O3 layer in the Ni/CeO2/Al2O3 catalysts. As the number of ALD cycles increases from 1 to 10, the conversion of CO2 and CH4 at 700 and 800 °C decreases, but the Ni/CeO2/Al2O3 catalysts remain coke-free as thermogravimetric analysis shows no weight loss up to 800 °C. The Al2O3 layer generated by ALD curtails the coking substantially, but the weakly metallic character of Ni and blocking of Ni sites by the Al2O3 layer are the major factors contributing to decreasing the catalytic conversion. The ALD technique provides an efficient way to fabricate atomically controlled oxide layers for improving the stability of catalysts against coke deposition and sintering.
中文翻译:
Al2O3包覆的Ni / CeO2纳米颗粒作为甲烷干重整的耐焦炭催化剂
镍由于其高活性而被认为是甲烷(DRM)干重整的经济上可行的催化剂。因为高吸热的DRM需要高的反应温度以同时活化CH 4和CO 2,所以可以通过烧结和碳焦化来引起Ni催化剂的失活。为了减轻催化剂失活,设计了由负载在CeO 2纳米棒上的单分散Ni纳米颗粒组成的Ni / CeO 2催化剂,并通过原子层沉积(ALD)涂覆了Al 2 O 3层。催化剂在DRM中的性能和沉积的碳量与Ni / CeO中Al 2 O 3层的厚度相关2 / Al 2 O 3催化剂。随着ALD循环次数从1增加到10,在700和800°C时CO 2和CH 4的转化率降低,但Ni / CeO 2 / Al 2 O 3催化剂保持无焦,因为热重分析表明无重量损耗高达800°C。ALD产生的Al 2 O 3层基本上减少了焦化,但是Ni的弱金属特性和Al 2 O 3对Ni位点的阻塞层是影响催化转化率降低的主要因素。ALD技术提供了一种有效的方法来制造原子控制的氧化物层,以提高催化剂对焦炭沉积和烧结的稳定性。
更新日期:2020-11-06
中文翻译:
Al2O3包覆的Ni / CeO2纳米颗粒作为甲烷干重整的耐焦炭催化剂
镍由于其高活性而被认为是甲烷(DRM)干重整的经济上可行的催化剂。因为高吸热的DRM需要高的反应温度以同时活化CH 4和CO 2,所以可以通过烧结和碳焦化来引起Ni催化剂的失活。为了减轻催化剂失活,设计了由负载在CeO 2纳米棒上的单分散Ni纳米颗粒组成的Ni / CeO 2催化剂,并通过原子层沉积(ALD)涂覆了Al 2 O 3层。催化剂在DRM中的性能和沉积的碳量与Ni / CeO中Al 2 O 3层的厚度相关2 / Al 2 O 3催化剂。随着ALD循环次数从1增加到10,在700和800°C时CO 2和CH 4的转化率降低,但Ni / CeO 2 / Al 2 O 3催化剂保持无焦,因为热重分析表明无重量损耗高达800°C。ALD产生的Al 2 O 3层基本上减少了焦化,但是Ni的弱金属特性和Al 2 O 3对Ni位点的阻塞层是影响催化转化率降低的主要因素。ALD技术提供了一种有效的方法来制造原子控制的氧化物层,以提高催化剂对焦炭沉积和烧结的稳定性。