A Principle for Highly Active Metal Oxide Catalysts via NaCl-Based Solid Solution

Toward the preparation of industrial metal oxide catalysts, sacrificial organic templates, excessive solvents, complex impregnation, and drying steps are generally required. Here, we report a versatile rule for the simple synthesis of highly porous metal oxides with well. dispersed noble metal species. Porous metal oxides (Co3O4, Fe-x, O-y, and Cr2O3) are obtained with some surface areas (e.g., Cr2O3: 224 m(2) g(-1)) beyond the record value. Surprisingly, small noble metal nanoparticles (e.g., Pd: 3.1 and Pt: 3.2 nm) could be incorporated by this solid-state process simultaneously. Corresponding Rh-Co3O4, Pd-FexOy, and Pt-Cr2O3 exhibit excellent performance: CH4 combustion (T-90 = similar to 360 degrees C and thermal stability: >100 h at 680 degrees C), hydrogenation of nitrobenzene and derivatives (turnover number [TON] = 2.49 x 10(4), 300 mmol per run), and reversed water gas shift (RWGS) reaction (44% CO2 conversion with similar to 98% CO selectivity and thermal stability: >100 h at 500 degrees C), respectively. Therefore, current principle via a NaCI-based solid solution could provide a solid-state, fast, and efficient route for processing metal oxide catalysts.