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Ammonia-borane (AB) is one of the most promising fuel forms for the hydrogen economy, but the reaction requires a good catalyst to accelerate this hydrolysis reaction under ambient conditions. Here, H2 evolution upon hydrolysis of ammonia-borane catalyzed by tetra-(p-hydroxyphenyl) porphyrin (THPP) stabilized transition metal nanoparticles (RhNPs/THPP, RuNPs/THPP, PtNPs/THPP) has been reported for the first time. The as-synthesized nanocomposites (TMNPs/THPP) show high catalytic activity in the AB hydrolysis. Among these TMNPs/THPP, the RhNP-3/THPP exhibits the best catalytic activity with a TOF of 213.64 molH2 molcata−1 min−1. In addition, tandem reaction for 1,1-diphenylethylene hydrogenation has also confirmed the H2 evolution upon hydrolysis of ammonia-borane. [ABSTRACT FROM AUTHOR]

The synthesis of robust transition metal nanoparticles (TMNPs) are still intensively investigated because of multiple up‐to date applications in catalysis, solar cells, nonlinear optics, biological labeling, nanoelectronics, medicine and energy storage devices. Here we report synthesis of tetrahydroxyphenylporphyrin (TPP‐OH)‐stabilized TMNPs (including AuNPs, AgNPs and PdNPs) by mixing TPP‐OH and simple commercial metal salt and followed by the addition of sodium borohydride at 0 °C. The as‐synthesized nanocomposites show high catalytic activity in the reduction of 4‐nitrophenol, a pertinacious pollutant occurring in industrial waste water. In addition, it is evident that a drastic absorption change has been observed in UV/Vis spectra, confirming that generation of hydroxyl radicals induced by AgNPs and further oxidized methylene blue (MB) to hydroxymethylene blue (MB‐OH). [ABSTRACT FROM AUTHOR]