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首页> 外文期刊>RSC Advances >Enhanced resistance to calcium poisoning on Zr-modified Cu/ZSM-5 catalysts for the selective catalytic reduction of NO with NH3
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Enhanced resistance to calcium poisoning on Zr-modified Cu/ZSM-5 catalysts for the selective catalytic reduction of NO with NH3

机译：增强对Zr改性的Cu / ZSM-5催化剂对钙中毒的耐药性，用于选择性催化还原NO NH 3

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摘要

Ca/ZrCu/ZSM-5 catalysts containing different Zr contents were prepared by incipient wetness impregnation. The catalysts were tested for the selective catalytic reduction (SCR) of NO _( x ) with ammonia and characterized by N _(2) -BET, N _(2) O titration, XRD, NH _(3) -TPD, H _(2) -TPR, and XPS techniques. In the temperature range of 100–170 °C, after calcium impregnation, NO _( x ) conversion over the Cu/ZSM-5 catalyst decreased by 11.3–24.3%, while that over Zr _(0.10) /Cu/ZSM-5 only decreased by 3.8–12.2%. The improvement of the calcium poisoning resistance of the ZrCu/ZSM-5 catalyst is mainly attributed to an increase in the dispersion and the surface concentration of Cu. Moreover, the addition of zirconium promotes the reduction of CuO by decreasing the interaction between CuO and CaO, which also contributes to the improvement of resistance to CaO poisoning. The apparent activation energy and turnover frequency for the SCR reaction over the Ca/Zr _( x ) Cu/ZSM-5 catalysts were calculated and discussed.
机译：通过初期湿润浸渍制备含有不同ZR内容物的Ca / ZrCu / ZSM-5催化剂。用氨的NO _（x）的选择性催化还原（SCR）测试催化剂，并表征N _（2）-BET，N _（2）O滴定，XRD，NH _（3）-TPD，H _（2）-TPR和XPS技术。在100-170℃的温度范围内，在钙浸渍之后，在Cu / ZSM-5催化剂上转化在Cu / ZSM-5催化剂上的转化率为11.3-24.3％，而在Zr _（0.10）/ Cu / Zsm-5上的情况下降只减少3.8-12.2％。 ZrCU / ZSM-5催化剂的钙中毒抗性的改善主要归因于分散体的增加和Cu的表面浓度。此外，通过降低CuO和CaO之间的相互作用，加入锆促进CuO的还原，这也有助于改善对CaO中毒的抗性。计算并讨论了在Ca / Zr _（x）Cu / Zsm-5催化剂上的SCR反应的表观活化能量和周转频率。

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