文献类型：期刊文献

英文题名：Study on compositions of FCC flue gas and pollutant precursors from FCC catalysts

作者：Luan, Hui[1];Lin, Jueying[2];Xiu, Guangli[1,3,4];Ju, Feng[2];Ling, Hao[2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Environm Protect Key Lab Environm Stand, Shanghai 200237, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2020

卷号：245

外文期刊名：CHEMOSPHERE

收录：;EI(收录号：20195107877121);WOS:【SCI-EXPANDED(收录号:WOS:000521513100093)】；

基金：The financial support from the Fundamental Research Funds for the Central Universities of China, grant from Science and Technology Commission of Shanghai Municipality (19DZ1205000), grant from Shanghai Department of Ecology and Environment (2018-37), and is gratefully acknowledged.

语种：英文

外文关键词：FCC flue gas; Pollutant precursor; Ammonia; HCN; FCC catalysts

摘要：Fluid catalytic cracking (FCC) unit emits a large amount of flue gas, which is a major issue of environmental protection supervision. A spent FCC catalyst from a typical FCC unit was characterized by NMR, XPS, EA TGA and TPD-MS methods. XPS results presented that the nitrogen compounds in coke were pyridine nitrogen, pyrrole and quaternary nitrogen. Sulfur compounds in coke are in the form of thiophene and thiols. TGA and TPD-MS results indicated that the soft coke in the spent catalyst may decompose to small molecular such as NOx, SO2 and HCN. NH3 and HCN are mainly emitted due to the incomplete combustion. The flue gas from the FCC unit is monitored by different on-line monitoring instruments. Results showed that the existence of ammonia greatly affected the value of SO2 during the venting process or instruments' inlet piping system, where saturated vapor in flue gas is partially condensed. The concentration of NH3 and HCN is more than 100 ppm, which should be paid more attention to. Taken together, fourier transform infrared method was more applicable for monitoring FCC flue gas than non-dispersed infrared method and ultraviolet fluorescence method. (C) 2019 Elsevier Ltd. All rights reserved.