In situ reactor to image catalysts at work in three-dimensions by Bragg coherent X-ray diffraction

Autor(es)

Rochet, Amelie ; Suzana, Ana Flavia ; Passos, Aline R. ; Kalile, Tiago ; Berenguer, Felisa ; Santilli, Celso V. ; Pulcinelli, Sandra H. ; Meneau, Florian

• Tipo de documento: Artigo Científico
• Fonte: CATALYSIS TODAY; v. 336, p. 5-pg., 2019-10-01.

Resumo

A new reactor dedicated to high temperature Bragg coherent X-ray diffraction imaging (Bragg CDI) of heterogeneous catalysts at atmospheric pressure has been developed. It allows direct visualisation of the shape, surface texture and inner structures of single nanoparticles with a resolution of a few tens of nanometers. Moreover, in situ Bragg CDI provides information of the displacement field evolution during the reaction. Our setup has been used to observe restructuring in three-dimensions of a model gold catalyst under controlled temperatures and gas atmospheres, He and CO/O-2/He. The catalytic performances obtained inside this reactor during the catalytic oxidation of carbon monoxide can be directly correlated with the structural changes of the nanoparticles. (AU)

• Processo FAPESP: 14/25964-5 - Dos monômeros às nanopartículas: investigação in situ da formação de nanopartículas de ouro em tempo real por técnicas síncrotron e de microscopia
• Beneficiário: Florian Edouard Pierre Meneau
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 17/01283-7 - Imageamento por difração coerente de Bragg para caracterização de nano-catalisadores de ouro
• Beneficiário: Ana Flávia Suzana
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 14/27127-3 - Gênese de nanopartículas de ouro: nucleação, crescimento e estabilização
• Beneficiário: Ana Flávia Suzana
• Modalidade de apoio: Bolsas no Brasil - Doutorado