Self-sustained combustion of carbon monoxide promoted by the Cu-Ce/ZSM-5 catalyst in CO/O2/N2 atmosphere

CATEGORY: ZEOLITES 
Self-sustained combustion of carbon monoxide promoted by the Cu-Ce/ZSM-5 catalyst in CO/O2/N2 atmosphere

Type	Journal Article
Author	Feng Bin
Author	Xiaolin Wei
URL	http://www.sciencedirect.com/science/article/pii/S0926337314004056
Volume	162
Pages	282-288
Publication	Applied Catalysis B: Environmental
Date	January 2015
Abstract	Introduction RIPP (Research Institute of Petroleum Processing, SINOPEC) has conducted studies on catalytic additives for controlling NOx emission, and developed RDNOx (RIPP’s decreasing NOx) series additives (types I and II) in 2013. Authors describe the catalytic performances of RDNOx additives. Nitrogen Chemistry in FCC Regenerator and the Design of RDNOx Additives In FCC process, 40-50%  of the nitrogen in feed is deposited as coke on spent catalysts. However, during regeneration the majority of the nitrogen in coke is converted to N2 with only 2-5% resulting in NOx. NOx emissions from FCC regenerator usually range from 50-500ppm.. Nitrogen in coke is first converted to reduced compounds such as HCN, NH3. These intermediates are subsequently oxidized to NOx or converted to N2. NOx can be reduced by CO and coke in the regenerator. The reaction of N2 with O2 occurs at very low rate below 1600°F. However, most of the FCC regenerators are operated below 760°C. In full burn conditions especially when Pt based CO promoter (Pt-COP) is used, NOx emission is usually much higher than partial or incompletely burn conditions because Pt can promote both the oxidization of CO and NH3, HCN to NOx. Two types of additives are designed and developed. RDNOx-I is a NOx reduction additive which can be used with Pt or non-Pt CO promoter; RDNOx-II is low NOx promoter which can reduce the formation of NOx while maintain higher CO oxidation activity.