Rate-determining Step of Selective Catalytic Reduction of NO by Acetylene Over HZSM-5
Tóm tắt
Nitrate species is crucial intermediate of selective catalytic reduction of NO by acetylene (C2H2-SCR) over HZSM-5. It is proposed that formation of nitrate species on the zeolite is rate-determining step of C2H2-SCR. The proposition is supported by the experimental results: (1) No nitrate species could be detected by in situ FTIR in steady C2H2-SCR over HZSM-5 at 350 °C, while the bands due to nitrate species were clearly observed on the zeolite both in situ in NO + O2 and after a brief evacuation at the temperature; (2) Yttrium incorporation into HZSM-5 zeolite considerably enhanced nitrate species formation on the catalyst and correspondingly the activity of the catalyst for C2H2-SCR was significantly increased. Both the promotional effect of yttrium on C2H2-SCR and the rate-determining step of C2H2-SCR being nitrate species formation over the catalyst were first reported herein.
Tài liệu tham khảo
Iwamoto M, Yahiro H, Yu-u Y, Shundo S, Miauno N (1990) Shokubai (Catalyst) 32:430
Held W, Konig A, Ritcher T, Puppe L (1990) SAE Paper 900496
She X, Flytzani-Stephanopoulos M (2006) J Catal 237:79
Chupin C, van Veen AC, Konduru M, Després J, Mirodatos C (2006) J Catal 241:103
Lónyi F, Valyon J, Gutierrez L, Ulla MA, Lombardo EA (2007) Appl Catal B 73:1
Bautista P, Faraldos M, Yates M, Bahamonde A (2007) Appl Catal B 71:254
Konova P, Arve K, Klingstedt F, Nikolov P, Naydenov A, Kumar N, Murzin D Yu (2007) Appl Catal B 70:138
García Cortés JM, Illán Gómez MJ, Salinas Martínez de Lecea C (2007) Appl Catal B 74:313
Zhang F, Zhang S, Guan N, Schreier E, Richter M, Eckelt R, Fricke R (2007) Appl Catal B 73:209
Wang X, Xu Y, Yu S, Wang C (2005) Catal Lett 103:101
Wang X, Yu S, Yang H, Zhang S (2007) Appl Catal B 71:246
Yu Y, Hong He, Feng Q, Gao H, Yang X (2004) Appl Catal B 49:159
Ivanova E, Hadjiivanov K, Klissurski D, Bevilacqua M, Armaroli T, Busca G (2001) Micropor Mesopor Mat 46:299
Shimizu K, Shibata J, Yoshida H, Satsuma A, Hattori T (2001) Appl Catal B 30:151
He H, Zhang C, Yu Y (2004) Catal Today 90:191
Poignant F, Freysz JL, Daturi M, Sauaaey J (2001) Catal Today 70:197
Haneda M, Bion N, Daturi M, Saussey J, Lavalley J-C, Duprez D, Hamada H (2002) J Catal 206:114
He C, Paulus M, Find J, Nickl JA, Eberle H-J, Spengler J, Chu W, Köhler K (2005) J Phys Chem B 109:15906
Shimizu K, Kawabata H, Satsuma A, Hattori T (1999) J Phys Chem B 103:5240
Shimizu K, Sugino K, Kato K, Yokota S, Okumura K, Satsuma A (2007) J Phys Chem C 111:6481