Download Environmental Catalysis by John N. Armor (Eds.) PDF

By John N. Armor (Eds.)

content material: NOx elimination : an outline / John N. Armor --
Catalytic decomposition of nitric oxide over promoted copper-ion-exchanged ZSM-5 zeolites / Yanping Zhang and Maria Flytzani-Stephanopoulos --
Reactivity of Cu-based zeolites and oxides within the conversion of NO within the presence or absence of O₂ / G. Centi, C. Nigro, S. Perathoner, and G. Stella --
Deactivation of Cu-ZSM-5 : possible irrelevance of modest zeolite degradation in comparison to cupric sintering to CuO / Karl C.C. Kharas, Heinz J. Robota, and Abhaya Datye --
Catalytic relief of NO via hydrocarbon in oxidizing surroundings : significance of hydrocarbon oxidation / H.W. Jen and H.S. Gandhi --
X-ray photoelectron spectroscopy of Cu-ZSM-5 zeolite / L.P. Haack and M. Shelef --
Catalysts for cleanup of NH₃, NOx, and CO from a nuclear waste processing facility / R. Gopalakrishnan, J. Davidson, P. Stafford, W.C. Hecker, and C.H. Bartholomew --
cellular engine emission keep an eye on : an outline / John N. Armor --
Palladium-only catalysts for closed-loop keep watch over / J.C. Summers and W.B. Williamson --
ameliorations in habit of Pt, Rh, and Pt-Rh alloy surfaces towards NO aid / Bernard E. Nieuwenhuys, Jacobus Siera, Ken-ichi Tanaka, and Hideki Hirano --
Adhesion of Rh, Pd, and Pt to alumina and NO reactions on ensuing surfaces : version calculations / Thomas R. Ward, Pere Alemany, and Roald Hoffmann --
interplay of NO and CO on Rh-SiO₂ and Ce-Rh-SiO₂ catalysts : a brief in situ IR spectroscopic learn / Girish Srinivas, Steven S.C. Chuang, and Santanu Debnath --
energy plant emissions : an outline / John N. Armor --
NOx abatement via selective catalytic relief / G.W. Spitznagel, ok. Hüttenhofer, and J.K. Beer --
international event with selective catalytic aid NOx controls / Phillip A. Lowe and William Ellison --
Low-temperature selective catalytic relief NOx keep an eye on / Phillip A. Lowe --
kinfolk of flexible catalyst applied sciences for NOx removing in strength plant functions / R.M. Heck, J.M. Chen, B.K. Speronello, and L. Morris --
NOx keep watch over via catalytic combustion of traditional gasoline / S.K. Agarwal, B.W.-L. Jang, R. Oukaci, A. Riley, and G. Marcelin --
Contemporaneous removing of SO₂ and NO from flue gasoline utilizing a regenerable copper-on-alumina sorbent-catalyst / G. Centi, N. Passarini, S. Perathoner, and A. Riva --
Pt-ZrO₂ catalysts for the oxidation of NO and SO₂ : results of sulfate / E. Xue, okay. Seshan, P.D.L. Mercera, J.G. van Ommen, and J.R.H. Ross --
destiny fuels : an summary / John N. Armor --
hugely selective olefin skeletal isomerization strategy / J. Barin clever and Don Powers --
response kinetics of fuel sulfur compounds : catalytic mechanisms for sulfur relief / Robert H. Harding, Robert R. Gatte, Jacqueline A. Whitecavage, and Richard F. Wormsbecher --
unstable natural compounds : an summary / John N. Armor --
Catalysts for low-temperature oxidation of ethene / Linda M. Parker and John E. Patterson --
temporary reaction of a monolithic oxidation catalyst : results of procedure stipulations / Alec A. Klinghoffer and Joseph A. Rossin --
Low-temperature deep oxidation of aliphatic and fragrant hydrocarbons / Mark T. Vandersall, Stephen G. Maroldo, William H. Brendley, Jr., Krzysztof Jurczyk, and Russell S. Drago --
Deep oxidation of chlorinated hydrocarbons / Russell S. Drago, S.C. Petrosius, G.C. Grunewald, and William H. Brendley, Jr. --
Low-temperature catalytic combustion of risky natural compounds utilizing ozone / Antonella Gervasini, Claudia L. Bianchi, and Vittorio Ragaini --
different possibilities for catalysts in environmental difficulties : an summary / John N. Armor --
aid of SO₂ to elemental S over ceria catalysts / Wei Liu and Maria Flytzani-Stephanopoulos --
Hydrolysis of COS on titania catalysts : mechanism and impression of oxygen / H.M. Huisman, P. van der Berg, R. Mos, A.J. van Dillen, and J.W. Geus --
Catalytic bromine restoration from HBr waste / Paul F. Schubert, Richard D. Beatty, and Suresh Mahajan --
program of supported gold catalysts in environmental difficulties / Susumu Tsubota, Atsushi Ueda, Hiroaki Sakurai, Tetsuhiko Kobayashi, and Masatake Haruta.

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Sintering of CuO and resultant local destruction of zeolite crystallinity in the vicinity of sintering oxides of Cu. Cu-ZSM-5 can reduce NO under net oxidizing conditions (1-14) but the performance is not durable (15). Catalytic deactivation of Cu-ZSM-5-387 caused more substantial declines in pore volume than simple hydrothermal aging in air at comparable temperatures (15). Catalysis induced sintering of the initially present copper species to CuO, as shown by EXAFS and XRD(15). We suggested that deactivation is caused primarily by this sintering process and that degradation of the crystalline zeolite was subsidiary in cause and secondary in effect (15).

Deactivation of Cu-ZSM-5 KHARASETAL. 43 Figure 3. Micropore volume, determined by Ar sorption, as a function of deactivation severity: micropore volume decreases after catalytic or hydrothermal treatments do not correlate precisely with catalytic deactivation. * CuO • λ /ν 831°C ΗΤΑ Λ / /\ 800°C catalysis Λ Λ 750°C catalysis \ A 700°C catalysis Λ 600°C catalysis Λ Fresh ι 1 1 ι 34 35 36 11 11 1 ι 1 37 38 39 40 2Θ Figure 4. X-ray diffraction patterns of the various Cu-ZSM-5-207 samples reveal sintering of copper species to CuO correlates with deactivation.

Cu-zeolites in comparison with CuO-ZK)2 and CUO-T1O2 sample have thus tentatively a higher rate of N 2 O formationfromadsorbed oxidized nitrogen oxide species and higher rate of the consecutive decomposition of this intermediate to N 2 . More studies, however, are necessary to demonstrate this tentative reaction mechanism. δ Comparison between Cu-based Zeolites and Oxides. After a slight prereduction such as the simple treatment at 450°C with a heliumflow,all CuO loaded oxides are initially very active in NO decomposition even at low temperature (300°C), but rapidly the activity declines to zero.

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