fig5

Figure 5. (A) W 4f XPS, (B) EPR of these three catalysts. XPS: X-ray photoelectron spectroscopy; EPR: electron paramagnetic resonance.
Figure 5. (A) W 4f XPS, (B) EPR of these three catalysts. XPS: X-ray photoelectron spectroscopy; EPR: electron paramagnetic resonance.
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