Model of temperature dependence of a vanadia-alumina catalyst for nitric oxide reduction by ammonia: fresh catalyst

Abstract

NH,, 7664-41-7; V, 7440-62-2; Cr, 7440-47-3; Fe, 7439-89-6. L i t e r a t u r e C i t e d Registry No. Bauerie, G. L.; Wu, S. C.; Nobe, K. Ind. Eng. Chem. Prod. Res. Dev. 1075, Chertov, V. M.; Okopnaya, N. T. Kinet. Katal. 1078, 19, 1595. Cole, D. J.; Cullis, C. F.; Hucknaii, D. J. J . Chem. SOC., Faraday Trans. Inornata, M.; Miyamoto, A.; Murakami, Y. Chem. Lett. 1078, 799. Inomata, M.; Miyamoto, A,; Murakami. Y. J . Catal. 1880, 62, 140. Inomata, M.; Miyamoto, A,; Murakami, Y. J. Phys. Chem. 1081, 85, 2372. Inomata, M.; Miyamoto, A.; UI, T.; Kobayashi, K.; Murakami, Y. Ind. Eng. Inomata, M.; Mori, K.; Miyamoto, A,; Ui, T.; Murakami, Y. J . Phys. Chem. Inomata, M.; Mori, K.; Miyamoto, A.; Murakami, Y. J . Phys. Chem. 1083b, Kasaoka, S.; Yamanaka, T. Nippon Kagaku Kaishl 1077, 6 , 907. Kato, A.; Matsuda, S.; Nakajima, F.; Inamari, M.; Watanabe, Y. J. Phys. Kato, A.; Matsuda, S.; Kamo, T. Ind. Eng. Chem. Prod. Res. Dev. 1083, Markvart, M.; Pour, V. C. J . Catal. 1087, 7 , 279. 14, 268. 1078, 72, 2185. Chem. Prod. Res. Dev. 1982, 21, 424. 10838, 87, 754. 87, 761. Chem. 1081, 85, 1710. 22, 406. Matsuda, S.; Takeuchl, M.; Hishinuma, Y.; Nakajim, F.; Narita, T.; Watanabe, Miyamoto, A.; Yamazaki, Y.; Inomata, M.; Murakami, Y. J. Phys. Chem. Miyamoto, A.; Yamazaki, Y.; Hattori, T.; Inomata, M.; Murakami, Y. J. Catal. Miyamoto, A.; Kobayashi, K.; Inomata, M.; Murakami, Y. J. Phys. Chem. Nakajima, F.; Takeuchi, M.; Matsuda, S.; Uno, S.; Mori, T.; Watanabe, Y.; Naruse, Y.; Ogasawara, T.; Hata, T.; Kishitake, H. Ind. Eng. Chem. Prod. Niiyama, H.; Ookawa, T.; Echigoya, E. Nippon KagakuKaishi 1075, 2 , 1871. Niiyama, H.; Murata, K.; Echigoya, E. Geus, J. W.; Geiiings. P. J. Ind. Eng. Shikada, T.; Fujimoto, K.; Kunugi, T.; Tominaga, H.; Kaneko, S.; Kubo, Y. Takagi, M.; Kawai, T.; Soma, M.; Onishi, T.; Tamaru, K. J . Phys. Chem. Tauster, S. A vanadla-alumina catalyst (10% V, O, on AI,O,) was employed in a packed-bed, tubular reactor to obtain kineticThe deactivating effect of SO2 on the reaction rate of the selective catalytic reduction of NO by NH, over a vanadia-alumina catalyst was examined. A two-parameter model developed in the companion paper (Nam, I.; Eldridge, J. W.; Kittrell, J. R. Znd. Eng. Chern. Prod. Res. Dev., preceding paper in this issue) was extended to the analysis of the deactivation data. The activation energies for both fresh and deactivated catalysts were similar. The sulfur content of the catalyst, as well as its surface area, appears to be a dominant deactivation parameter, analogous to coke-induced deactivation. Pore size distribution changes indicate that deactivation in this reaction system involves pore filling and plugging by the deactivating agent. That agent appears to be aluminum sulfate, on the basis of experimental results obtained from thermal gravimetric analyses. An empirical exponential dependence of catalyst activity on the catalyst sulfur content was observed for both primary reactions, NO reduction and NH, oxidation.

Catalysis for NOx abatement

“…However, NO does not adsorb on an ammoniacovered surface because NH 3 has greater basicity and blocks the Ti 4+ adsorption sites. This data is in good agreement with the kinetic observations on V 2 O 5 -based catalysts where zero and first order kinetics with respect to NH 3 and NO, respectively [133][134][135][136] is observed. In vanadia-based catalysts, NH 3 adsorbs mainly on the Bronsted acid sites while insignificant NO adsorption is observed.…”

Selective Catalytic Reduction of NO by NH3 over a Bulk Sulfated CuO/γ-Al2O3 Catalyst

“…Oxidation of NH 3 on the Sulfated CuO/ γ -Al 2 O 3 . It is known that oxidation of NH 3 directly affects the optimum temperature for NO conversion. , NH 3 is mainly oxidized by reaction 5 (4NH 3 + 3O 2 → 2N 2 + 6H 2 O) and in part by reaction 6 (4NH 3 + 5O 2 → 4NO + 6H 2 O) in Table .…”

Effect of Copper Contents on Sulfur Poisoning of Copper Ion-Exchanged Mordenite for NO Reduction by NH3

“…During the past few decades, much effort has been focused on the development of active catalysts for the removal of NO. Various types of catalysts, including noble metals, transition metal oxides, and mixed metal oxides, show high activity when used for the reduction of NO with NH3 (Meier and Gut, 1978;Nam et al, 1986a;Wong and Nobe, 1986). Recently, copper ionexchanged Y zeolite and H-mordenite have also been reported to be efficient catalysts for this reaction (Williamson and Lunsford, 1976; Mizumoto et al, 1979;Kiovsky et al, 1980; Nam et al, 1988; Medros et al, 1989).…”