Relevance of Co, Ag-ferrierite catalysts acidity and cation siting to CH 4 -NO x -SCR activity Ciambelli, P. ; Sannino, D. ; Palo, E. ; Gargano, G. ; Balboni, E. ; Martucci, A. ; Dalconi, M. C. ; Alberti, A. Abstract Publication: Nuovo Cimento B Serie Pub Date: October 2008 DOI: 10.1393/ncb/i2008-10731-3 Bibcode: 2008NCimB.123.1583C