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Số người truy cập: 106,075,166

 On the Real Nature of Rh Single-Atom Catalysts Dispersed on the ZrO2 Surface
Tác giả hoặc Nhóm tác giả: Ho Viet Thang, Gianfranco Pacchioni
Nơi đăng: Chem Cat Chem; Số: 12;Từ->đến trang: 1-11;Năm: 2020
Lĩnh vực: Khoa học; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The nature of a Rh single-atom catalyst (SAC) stabilized on the surface of tetragonal zirconia, t-ZrO2, is investigated here by performing extensive DFT calculations on various possible structural models and comparing the resulting spectral properties with existing data from the literature. The models considered include a Rh atom adsorbed on the clean surface, (Rh)ads, Rh atoms stabilized by the reaction with surface OH groups to form direct Rh-O bonds, (RhO)ads, and (RhO2)ads, the interaction of a Rh atom with an OH group, (RhOH)ads, and a Rh atom replacing Zr in the lattice, (Rh)subZr. Also a t-ZrO2 supported Rh6 cluster has been considered for comparison with Rh single atoms. Surface heterogeneity has been taken into account by computing the various Rh species at terraces and at step sites of the zirconia surface. Based on the calculated adsorptionenergies, Rh 3d core level binding energies, and stretching frequencies of adsorbed CO and comparison with the experimental data we conclude that the potential candidates for Rh SAC on t-ZrO2 are (RhO)ads and (RhOH)ads species
ABSTRACT
The nature of a Rh single-atom catalyst (SAC) stabilized on the surface of tetragonal zirconia, t-ZrO2, is investigated here by performing extensive DFT calculations on various possible structural models and comparing the resulting spectral properties with existing data from the literature. The models considered include a Rh atom adsorbed on the clean surface, (Rh)ads, Rh atoms stabilized by the reaction with surface OH groups to form direct Rh-O bonds, (RhO)ads, and (RhO2)ads, the interaction of a Rh atom with an OH group, (RhOH)ads, and a Rh atom replacing Zr in the lattice, (Rh)subZr. Also a t-ZrO2 supported Rh6 cluster has been considered for comparison with Rh single atoms. Surface heterogeneity has been taken into account by computing the various Rh species at terraces and at step sites of the zirconia surface. Based on the calculated adsorptionenergies, Rh 3d core level binding energies, and stretching frequencies of adsorbed CO and comparison with the experimental data we conclude that the potential candidates for Rh SAC on t-ZrO2 are (RhO)ads and (RhOH)ads species
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