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首页> 外文期刊>Chemical engineering journal >Selective catalytic oxidation of ammonia to N2 over wire-mesh honeycomb catalyst in simulated synthetic ammonia stream
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Selective catalytic oxidation of ammonia to N2 over wire-mesh honeycomb catalyst in simulated synthetic ammonia stream

机译：网状蜂窝状催化剂在模拟合成氨流中将氨选择性催化氧化为N2

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摘要

The novel wire-mesh honeycomb (WMH) was reported to be an excellent substrate of active component for selective catalytic oxidation of ammonia under laboratory-simulated synthetic ammonia stream, and was also evaluated in comparison with traditional ceramic honeycomb (CH). WMH possessed higher open frontal area (OAF), larger geometric surface area (GAS), and lower pressure drop compared with CH, which induced the excellent mass- and heat-transfer rate and conversion efficiency. Different active components displayed the different catalytic performance. The active Ag species exhibited better NH3 conversion, and the Cu species could evidently improve N2 selectivity. The addition of Ce species into Cu catalyst promoted the NH3 conversion but decreased in the N2 selectivity. Comparatively, the Ag-Cu/WMH catalyst exhibited higher resistance to high gas hourly space velocity (GHSV) and the superior NH3-SCO activity and N2 selectivity, which was appropriately used to eliminate higher concentration NH3. Moreover, the Ag-Cu/WMH catalyst displayed the excellent NH3 conversion in the long-term stability and accelerated deactivation experiment, which indicated that the Ag-Cu/WMH catalyst would have an extremely potential application in NH3 abatement for synthetic ammonia industry.
机译：据报道，新型丝网蜂窝（WMH）是用于在实验室模拟的合成氨流下选择性催化氧化氨的活性成分的出色基材，并且与传统陶瓷蜂窝（CH）进行了比较。与CH相比，WMH具有较高的开放额叶面积（OAF），较大的几何表面积（GAS）和较低的压降，这导致了优异的传质和传热速率以及转化效率。不同的活性组分表现出不同的催化性能。活性Ag物种表现出更好的NH3转化率，而Cu物种可以明显提高N2的选择性。在铜催化剂中添加Ce物种促进了NH3的转化，但降低了N2的选择性。相比之下，Ag-Cu / WMH催化剂对高气体时空速度（GHSV）表现出更高的抵抗力，并且具有出众的NH3-SCO活性和N2选择性，可用于消除较高浓度的NH3。此外，Ag-Cu / WMH催化剂在长期稳定性和加速失活实验中表现出优异的NH3转化率，这表明Ag-Cu / WMH催化剂在合成氨工业的NH3减排中具有巨大的潜力。

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