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使用商业化的金属磷酸盐(M-P-O,M=Mg,Al,Ca,Fe,Co,Zn,La)为载体,以Pd(NO_3)_2为PdOx的前躯体,制备了PdOx/M-P-O系列催化剂,并测试了催化剂的N_2O分解性能.发现PdOx/Ca-P-O(又记为PdOx/HAP,HAP为羟基磷灰石)在该系列样品中表现出最佳催化活性,在反应温度375℃时能催化N_2O完全转化.而其他PdOx/M-P-O催化剂几乎没有活性.O2在反应气中的共存对PdOx/HAP的活性影响很小,而H_2O蒸气的共存明显抑制活性.但O2和H_2O蒸气对活性的影响是可逆的,即O2或者H_2O撤走后,活性复原.PdOx/HAP在无O2和有O2情况下都保持较好的稳定性.使用4%H2,在400℃对PdOx/HAP进行预处理能提高催化活性.使用XRD、TEM、XPS、ICP等对PdOx/HAP进行了表征.
PdOx / MPO catalysts were prepared using Pd (NO_3) _2 as the precursor of PdOx using commercially available metal phosphates (MPO, M = Mg, Al, Ca, Fe, Co, Zn, La) PdOx / CaO (PdOx / HAP, HAP as hydroxyapatite) was found to exhibit the best catalytic activity in this series of samples. It was found that the catalytic activity of N 2 O While the other PdOx / MPO catalysts showed almost no activity.The coexistence of O2 in the reaction gas had little effect on the activity of PdOx / HAP, but the coexistence of H 2 O vapor significantly inhibited the activity.But the effect of O2 and H_2O vapor on the activity was reversible , That is, the activity recovered after the withdrawal of O 2 or H 2 O.PdOx / HAP maintained good stability in the absence of O 2 and O 2, and the pretreatment of PdOx / HAP with 4% H 2 at 400 ℃ increased the catalytic activity PdOx / HAP was characterized by XRD, TEM, XPS, ICP and so on.