Mechanism of NO-SCR by methane over Co,H-ZSM-5 and Co,H-mordenite catalysts

Abstract

Results of X-ray photoelectron spectroscopic (XPS) examination and temperatureprogrammed reduction measurements by H 2 (H 2 -TPR) showed that the Co-zeolite catalysts, which were found most active in the selective catalytic reduction of NO by methane to N 2 in

The simultaneous selective catalytic reduction of N 2 O and NO X with CH 4 on Co- and Ni-exchanged mordenite

“…This correlation confirms our previous results on CH 4 -SCR NO and extends to CH 4 -SCR sim the suggestion that isolated Co 2+ located in α-sites are the active sites for NO abatement [15,24].The inactivity of Co 2+ in β-sites can be ascribed to their low accessibility and steric hindrance to form intermediates (namely nitrites/nitrates and/or C x H y O z N k ) [16,18,53].…”

“…Co-MOR catalysts are active for the selective catalytic reduction of NO with CH 4 in the presence of excess O 2 (CH 4 -SCR NO ) [15][16][17][18], and for the selective catalytic reduction of N 2 O with CH 4 in the presence of excess O 2 (CH 4 -SCR N 2 O ) [19]. We therefore proposed Co-MOR as a potential catalyst, on one catalytic bed, for the simultaneous abatement of both N 2 O and NO using CH 4 as the reducing agent in the presence of excess O 2 (CH 4 -SCR sim ) [19].…”

On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

“…Zeolite-based catalysts containing different metals have been reported as active materials for the selective catalytic reduction of NO x with methane (CH 4 -SCR). Cobalt-containing zeolites, introduced by Li and Armor as active catalysts for CH 4 -SCR [6], have been widely studied by the scientific community [7][8][9][10][11]. This research has significantly contributed to the understanding of the nature of active species involved in this reaction, as well as the important parameters [12][13][14][15][16][17][18], Pt/Co [19,20], In/Co [21][22][23], La/Co [24], Zn/Co [25], Ag/Co [26] and Mn/Co [27].…”

Influence of Porosity on Product Distribution over Co/H‐ZSM‐22 Catalysts in the Upgrading of Palmitic Acid

“…The second peak (346 °C for Co/HZ‐22, 335 °C for Co/HZP‐22) and third peak (374 °C for Co/HZ‐22, 365 °C for Co/HZP‐22) were ascribed to Co 3 O 4 →CoO and CoO→Co 0 , respectively, as in the case of the Co/SiO 2 precursor (Figure a) . Furthermore, higher reduction temperatures were observed at around 435 and 553 °C especially for the Co/HZP‐22 precursor, which were attributed to the distribution of Co 2+ species over mesopores HZP‐22 and strong metal‐support interaction, respectively …”