Challenges and Prospective

An alternative approach for low-temperature SCR (i.e., at temperatures below 170 or 180 °C, suitable for flue gas applications) is H2-SCR. Studies on H2-SCR are relatively recent (i.e., after 1990s) and few. The few studies ( 1(X) publications and patents) on H2-SCR were focused on supported Pt and Pd. The H2-SCR activities peak at around 150 °C. Needless to say, the area of H2-SCR is in its infancy. 

The mechanism of H2-SCR is far less understood than that of NH3-SCR, partly due to the competing reaction of H2 combustion. Because of the tremendous potential for future apphcations of H2-SCR, it merits more R D efforts. 

Acknowledgments We thank Drs. Sandrine Rivillon and Eric Klingenberg of Air Products and Chemicals, Inc. for helpftil discussions. 

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