The “silica garden’' as a Brønsted acid catalyst
文献信息
The “silica garden’', an amorphous aluminosilicate produced from a solution of sodium silicate seeded with crystalline aluminium nitrate, has been examined by FTIR, TGA, solid-state NMR and catalytic testing. The silica garden is a Brønsted acid catalyst and we characterize its porosity, acidity and catalytic activity. The as-synthesized (AS) and H+-exchanged (H-AS) samples have BET surface areas of 148 and 161 g-1, respectively, with corresponding pore volumes of 0.36 and 0.31 cm3 g-1 and a broad distribution of pore sizes (30–1000 Å in diameter). The average pore size for AS and H-AS is 116 and 88 Å, respectively. The presence of Brønsted sites in the H+-exchanged samples was confirmed by FTIR of adsorbed pyridine. The population of Brønsted acid sites in the H+-exchanged sample with Si/Al=5.3 is lower than in a commercial amorphous aluminosilicate (ASA) with Si/Al=12 because, as NMR reveals, H-AS has proportionally more non-acid generating 6-coordinate aluminium. Catalytic tests reveal that, despite this, the acid sites in H-AS are stronger than in ASA.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.














