Abstract
Alumina and aluminosilicates, prepared under various synthesis conditions, play a central role in heterogeneous catalysis with a broad range of industrial applications. We report herein the atomic-...
Highlights
Alumina and amorphous aluminosilicates (ASAs) are important classes of industrial catalysts and catalyst supports, with applications ranging from petroleum refining to automotive emission control or biomass conversion.1 These materials have been extensively studied in attempts to correlate their surface (Lewis and/or Brønsted) acidity with their catalytic activity
Reinforced by complimentary information from diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), elemental analysis, highresolution transmission electron microscopy (HRTEM), energy-dispersive X-ray (EDX) spectroscopy and high-angle annular dark-field imaging (HAADF), we describe below how the structure, surface acidity, and domain interface of the silicasupported aluminum oxide layers is uncovered by high magnetic field and dynamic nuclear polarization (DNP) surface-enhanced solid-state (DNP SENS) nuclear magnetic resonance (NMR) spectroscopies
Alkyl groups are identified in TMA-SiO2−500 materials by νCH stretching modes at 2890-3010 cm−1 and δCH bending modes at 1510-1370 cm−1 (Figure 1b), which indicates that ozone pulses at 300 °C oxidize the grafted TMA only partially
Summary
Alumina and amorphous aluminosilicates (ASAs) are important classes of industrial catalysts and catalyst supports, with applications ranging from petroleum refining to automotive emission control or biomass conversion.1 These materials have been extensively studied in attempts to correlate their surface (Lewis and/or Brønsted) acidity with their catalytic activity. This interface forms the basis onto which layers containing aluminum sites in amorphous alumina-like environments grow when increasing further the number of ALD cycles.
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