Selective catalytic oxidation of ammonia to N-2 over wire-mesh honeycomb catalyst in simulated synthetic ammonia stream

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Indexed by:期刊论文

Date of Publication:2013-11-01

Journal:CHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI、Scopus

Volume:233

Page Number:233-241

ISSN No.:1385-8947

Key Words:Wire-mesh honeycomb; Ceramic honeycomb; NH3-SCO; Unsteady-state tests; Stability

Abstract: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 N-2 selectivity. The addition of Ce species into Cu catalyst promoted the NH3 conversion but decreased in the N-2 selectivity. Comparatively, the Ag-Cu/WMH catalyst exhibited higher resistance to high gas hourly space velocity (GHSV) and the superior NH3-SCO activity and N-2 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. (C) 2013 Elsevier B.V. All rights reserved.

Date of Publication:2013-11-01