Regulated synthesis of Zr-metal-organic frameworks with variable hole size and its influence on the performance of novel MOF-based heterogeneous amino acid-thiourea catalysts.

The BET specific surface area of the sample increased to 800 m 2 g −1 as the amount of acid added increases, and the pore diameter also showed an increasing trend from 3.494 nm to 7.565 nm ( Table 1b ).

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