Efficient hydrogenation of p-chlorophenol and Cr(VI) driven by hydrogen rich balls over Pd/C catalysts

Catalytic hydrogenation can selectively destabilize and detoxify specific contaminants in water. Herein, to explore safer and more efficient hydrogen sources, hydrogen rich balls (HRBs) were researched and applied for hydrogenating p-chlorophenol and Cr(VI) over Pd/C catalyst. The results showed that HRBs can realize the sustained release of H-2 by replacing the hydrogen in water, and generate the refined (micro/nano-sized) H-2 bubble, which effectively improves the adsorption and activation effectively of H-2 molecules on Pd/C catalyst, and the hydrogen atoms utilization efficiency during p-chlorophenol hydrodechlorination is as high as 3.5 %. Continuous flow experiments showed that rapid removal of p-chlorophenol with different concentrations could be achieved by adjusting the flow rate. Moreover, the high-toxic Cr(VI) was successfully reduced to the low-toxic Cr(III) in an appropriate pH range. This research is of far-reaching significance for realizing the detoxification of environmental pollutants and promoting the development of hydrogen economy.

Automated summary

This study explores safer and more efficient hydrogen sources by using hydrogen rich balls for catalytic hydrogenation of specific contaminants in water. The results show that hydrogen rich balls can sustainably release hydrogen, improving the adsorption and activation of hydrogen molecules on the catalyst and effectively removing p-chlorophenol and Cr(VI).