Journal of Petroleum & Environmental Biotechnology

Mn-containing catalysts for the low-temperature selective catalytic reduction of NOx with NH3

2^nd World Congress on Petrochemistry and Chemical Engineering

October 27-29, 2014 Embassy Suites Las Vegas, USA

Gianni Caravaggio, M Stanciulescu, L Nossova, B Greenhalgh and R Burich

Accepted Abstracts: J Pet Environ Biotechnol

Abstract:

Ammonia selective catalytic reduction (SCR) is the most efficient method to eliminate NOx emissions from diesel engines exhaust. However, with increasingly stringent government regulations, improvements are still needed to develop more active SCR-catalysts, especially in the low-temperature ranges (e.g. during cold starts). Mn- containing catalysts have demonstrated high NOx conversion over the intermediate temperature (200-450?C) range of diesel engine exhaust. Therefore in this study, Mn-exchanged CBV-2314 (ZSM-5 zeolite) catalysts were synthesized, tested for DeNO x activity and an effort was undertaken to extend the catalyst activity temperature range by promoting Mn with Cu, Ce and Fe. The catalysts were characterized by various physico-chemical methods such as SEM-EDX, TPD, BET and the activity was correlated to the properties. The study revealed that Mn-exchanged CBV-2314 with Mn (1.6 wt%- 3.6 wt%) demonstrated 100% NO x conversion over a broad temperature range (200-450?C). The Ce/MnCBV-2314 catalyst was more active and stable at high temperatures, close to 600?C, than those containing Fe or Cu oxides. Cu/MnCBV-2314 showed high activity at low temperature (100% NO x conversion near 170?C). Some of these Mn-based catalysts are promising candidates for the ammonia-SCR reduction of NO x from diesel engine exhaust.

Biography :

Gianni Caravaggio graduated with a Ph.D. in inorganic chemistry from the University of Ottawa in 2002. He has worked for 12 years as a research scientist for CanmetENERGY (Natural Resources Canada) performing R&D in the field of air particulate matter, fuels characterization and catalyst synthesis. His current focus is on the development and testing of methane oxidation catalysts for application with natural gas vehicles.