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WO x –ZrO 2 support was calcined at various temperatures for obtaining controllable activity of copper catalysts for NO x reduction by ammonia. The temperature window of copper catalyst for over 80% NO x conversion shifts from 180–300 to 230–350 °C by elevating the calcination temperature of WO x –ZrO 2 support from 500 to 600 °C, due to the increased...
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