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Synthesis and characterisation of monolithic PTFE ‐modified MnO X / FeO X catalysts for selective catalytic reduction ( SCR ) of NO X at low temperature
Author(s) -
Van Dongen Madeline T,
Ng Derrick,
Moura Leonardo V,
Acharya Durga,
Wang Jinxiu,
Easton Christopher D,
Wang Feng,
Xie Zongli
Publication year - 2021
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6612
Subject(s) - space velocity , catalysis , selective catalytic reduction , flue gas , water vapor , nox , chemical engineering , materials science , ceramic , chemistry , combustion , selectivity , composite material , organic chemistry , engineering
BACKGROUND Selective catalytic reduction (SCR) of NO X has been the most widely used technique for the reduction of NO X emissions from combustion flue gas. MnO X /FeO X based catalysts typically can attain high NO X conversion at low temperature but with inferior water vapor resistance. RESULTS A MnO X /FeO X catalyst was synthesized by the sonicated co‐precipitation method and then wash‐coated on ceramic cordierite monoliths to form a low pressure drop monolithic catalyst suitable for high flowrate flue gas treatment conditions. The catalyst achieved above 90% NO conversion at a gas hourly space velocity (GHSV) of 30 000 h −1 over a 125–225 °C temperature window under simulated industrial flue gas conditions. In the presence of up to 5% H 2 O vapor, comparable performance was retained for a reduced temperature window of ≥150 °C. In order to improve water resistance and LT‐SCR performance, an optimal 10% w/w polytetrafluoroethylene (PTFE) doped MnO X /FeO X catalyst was developed, which exhibited remarkably high performance of up to 98% NO conversion, with improved water resistance at up to 10% v/v H 2 O while retaining high performance from 100 °C. CONCLUSION Monolithic MnO X /FeO X catalyst incorporating PTFE significantly improved NO conversion and water vapour resistance due to the enhanced NH 3 adsorption associated with Lewis acid sites and water repellent property. These findings will provide guidance for researchers in this field to adapt F‐based or similar additives into the making of high performance and high water resistance catalysts either to retrofit existing catalyst synthesis procedures or reinvent a novel catalyst in a scalable but economical way. © 2020 Society of Chemical Industry