@article { ISI:000277529700013, title = {NO reduction under diesel exhaust conditions over Au/Al2O3 prepared by deposition-precipitation method}, journal = {Journal of Molecular Catalysis A-Chemical}, volume = {322}, number = {1-2}, year = {2010}, month = {MAY}, pages = {90-97}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Gold supported on alumina was prepared by urea deposition-precipitation method and compared to silver supported on alumina for the selective catalytic reduction of NO by hydrocarbons under lean conditions. The catalyst showed activity in the reduction of NO and 100\% selectivity towards N-2 in the temperature range 300-350 degrees C. At higher temperature the NO conversion decreased due to competitive oxidative reactions of the reductants. XPS analysis confirmed the good stability of gold nanoparticles deposited on alumina. Infrared studies showed the formation of various adsorbed species (formates, carboxylates, ad-NOx and cyanide) on the catalyst surface. Addition of H-2 to the feed containing decane enhanced the formation of these species on the catalyst surface as well as the catalytic activity for the NO conversion to N-2. (C) 2010 Elsevier B.V. All rights reserved.

}, keywords = {Deposition-precipitation, Gold, In situ IR, NO reduction, XPS}, issn = {1381-1169}, doi = {10.1016/j.molcata.2010.02.024}, author = {Miguel, P. and Granger, P. and Jagtap, Neelam and Shubhangi B. Umbarkar and Dongare, Mohan K. and Dujardin, Christophe} } @article { ISI:000308285100046, title = {Deposition-precipitation versus anionic-exchange Au/Al2O3 catalysts: a comparative investigation towards the selective reduction of NOx}, journal = {Catalysis Communications}, volume = {26}, year = {2012}, month = {SEP}, pages = {225-230}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Catalytic properties of supported gold catalysts on gamma-Al2O3 prepared by a conventional deposition-precipitation method were compared with those obtained by anionic-exchange for the reduction of NOx by hydrocarbon under lean conditions that simulate Diesel engine exhaust gas. Interestingly, a catalytic activity enhancement is observed after thermal ageing under reactive conditions at 500 degrees C on anionic-exchanged samples which make them suitable for practical developments. On the other hand, the reverse trend is observed on the solids prepared by deposition-precipitation which deactivate at low temperature. Such changes in catalytic properties have been tentatively explained on the basis of textural and structural modifications taking place during thermal ageing under wet atmosphere. (C) 2012 Elsevier B.V. All rights reserved.

}, keywords = {Anionic-exchange, Au catalyst, Deposition-precipitation, NOx abatement, Selective catalytic reduction}, issn = {1566-7367}, doi = {10.1016/j.catcom.2012.06.004}, author = {Nguyen, D. L. and Shubhangi B. Umbarkar and Dongare, Mohan K. and Lancelot, Christine and Girardon, J. S. and Dujardin, Christophe and Granger, P.} } @article { ISI:000318213800029, title = {Promising stability of gold-based catalysts prepared by direct anionic exchange for DeNO (x) applications in lean burn conditions}, journal = {Topics in Catalysis}, volume = {56}, number = {1-8}, year = {2013}, note = {9th International Congress on Catalysis and Automotive Pollution Control (CAPoC), Brussels, BELGIUM, AUG 29-31, 2012}, month = {MAY}, pages = {157-164}, publisher = {SPRINGER/PLENUM PUBLISHERS}, address = {233 SPRING ST, NEW YORK, NY 10013 USA}, abstract = {

Supported gold catalysts on gamma-Al2O3 have been investigated in the catalytic reduction of NO (x) in simulated Diesel exhaust gas conditions. Different parameters have been examined essentially the mode of gold incorporation via classical deposition-precipitation and anionic exchange methods and the nature of the pre-activation thermal treatment. The resistance to thermal ageing under reactive conditions at 500 A degrees C was found completely different with a significant rate enhancement on anionic-exchange samples. Further comparisons also show that the nature of the pre-activation thermal treatment influences the extent of surface reconstructions during thermal ageing with a detrimental effect of reductive pre-treatment on the catalytic performances.

}, keywords = {Anionic-exchange, Au/Al2O3 catalyst, Deposition-precipitation, NOx abatement, Selective catalytic reduction}, issn = {1022-5528}, doi = {10.1007/s11244-013-9946-z}, author = {Nguyen, D. -L. and Shubhangi B. Umbarkar and Dongare, Mohan K. and Lancelot, Christine and Girardon, J. S. and Dujardin, Christophe and Granger, P.} }