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On the selection of the best polymorph of Al2O3 carriers for supported cobalt nano-spinel catalysts for N2O abatement: an interplay between preferable surface spreading and damaging active phase–support interaction
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-10-16 00:00:00 , DOI: 10.1039/c7cy01575e Gabriela Grzybek 1, 2, 3, 4 , Klaudia Ciura 1, 2, 3, 4 , Sylwia Wójcik 1, 2, 3, 4 , Joanna Gryboś 1, 2, 3, 4 , Paulina Indyka 1, 2, 3, 4 , Marek Inger 4, 5, 6, 7 , Katarzyna Antoniak-Jurak 4, 5, 6, 7 , Paweł Kowalik 4, 5, 6, 7 , Andrzej Kotarba 1, 2, 3, 4 , Zbigniew Sojka 1, 2, 3, 4
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-10-16 00:00:00 , DOI: 10.1039/c7cy01575e Gabriela Grzybek 1, 2, 3, 4 , Klaudia Ciura 1, 2, 3, 4 , Sylwia Wójcik 1, 2, 3, 4 , Joanna Gryboś 1, 2, 3, 4 , Paulina Indyka 1, 2, 3, 4 , Marek Inger 4, 5, 6, 7 , Katarzyna Antoniak-Jurak 4, 5, 6, 7 , Paweł Kowalik 4, 5, 6, 7 , Andrzej Kotarba 1, 2, 3, 4 , Zbigniew Sojka 1, 2, 3, 4
Affiliation
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A series of cobalt spinel catalysts dispersed over various alumina supports (with varying alpha-, gamma-, delta- and theta-Al2O3 phase contents) were prepared and thoroughly characterized (XRF, XRD, μRS, SEM/TEM/EDX/SAED, TPR) and their reactivity was evaluated in low temperature N2O decomposition as a probe reaction. The observed significant differences in catalytic activities were discussed in terms of the support's nature, active phase dispersion, nanocrystal morphology and the alumina support–Co3O4 interactions. The more reactive amorphous phase as well as the gamma-, delta- and theta-Al2O3 phases gives rise to high dispersion of the spinel nanocrystals (∼10 nm) which is, however, sacrificed by the formation of mixed Co3−xAlxO4 spinels of much less activity. It was revealed that the best support for the deN2O catalyst is an α-Al2O3 phase of micrometric grain size and the optimal size of the Co3O4 nanocrystals is in the range of 20–30 nm. This catalyst was also found to be more resistant to H2O, NO and O2 contaminants in comparison to the catalysts based on γ-Al2O3.
中文翻译：
选择用于负载型钴纳米尖晶石催化剂以减少N 2 O的最佳Al 2 O 3载体多晶型物：较好的表面扩散与破坏性的活性相-载体相互作用之间的相互作用
一系列钴尖晶石催化剂分散在各种氧化铝载体（具有变化的α-，γ-，δ-和θ-Al系2分ö 3相含量）中制备并充分表征（XRF，XRD，μRS，SEM / TEM / EDX / SAED，TPR）及其反应性在低温N 2 O分解中作为探针反应进行了评估。根据载体的性质，活性相分散，纳米晶体的形貌以及氧化铝载体与Co 3 O 4的相互作用，对所观察到的催化活性的显着差异进行了讨论。更具反应性的非晶质相，以及γ-，δ-和θ-Al系2 ö 3相产生尖晶石纳米晶体的高色散（〜10 nm），但是由于形成活性低得多的混合的Co 3- x Al x O 4尖晶石而牺牲。据透露，对DEN最好的支持2 O类催化剂是α-Al系2 ö 3微米粒度的相和Co的最佳大小3 ö 4纳米晶体在20-30纳米的范围内。该催化剂也被发现是至H更耐2 O，NO和O 2在比较基础上的γ-Al催化剂污染物2 ö 3。
更新日期：2017-11-03
中文翻译：
选择用于负载型钴纳米尖晶石催化剂以减少N 2 O的最佳Al 2 O 3载体多晶型物：较好的表面扩散与破坏性的活性相-载体相互作用之间的相互作用
一系列钴尖晶石催化剂分散在各种氧化铝载体（具有变化的α-，γ-，δ-和θ-Al系2分ö 3相含量）中制备并充分表征（XRF，XRD，μRS，SEM / TEM / EDX / SAED，TPR）及其反应性在低温N 2 O分解中作为探针反应进行了评估。根据载体的性质，活性相分散，纳米晶体的形貌以及氧化铝载体与Co 3 O 4的相互作用，对所观察到的催化活性的显着差异进行了讨论。更具反应性的非晶质相，以及γ-，δ-和θ-Al系2 ö 3相产生尖晶石纳米晶体的高色散（〜10 nm），但是由于形成活性低得多的混合的Co 3- x Al x O 4尖晶石而牺牲。据透露，对DEN最好的支持2 O类催化剂是α-Al系2 ö 3微米粒度的相和Co的最佳大小3 ö 4纳米晶体在20-30纳米的范围内。该催化剂也被发现是至H更耐2 O，NO和O 2在比较基础上的γ-Al催化剂污染物2 ö 3。
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