Heavy metal poisoning resistance of a Co-modified 3Mn10Fe/Ni low-temperature SCR deNOx catalyst
- PDF / 1,344,324 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 36 Downloads / 169 Views
RESEARCH ARTICLE
Heavy metal poisoning resistance of a Co-modified 3Mn10Fe/Ni low-temperature SCR deNOx catalyst Baozhong Zhu 1 & Weiqi Chen 1 & Jinghui Wang 1 & Yunlan Sun 1
1
2
1
& Weiyi Song & Zhaohui Zi & Hailong Yu & Enhai Liu
1
Received: 13 July 2020 / Accepted: 12 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Heavy metals have a great influence on the deNOx efficiency of catalysts. The 3Mn10Fe/Ni catalyst that used nickel foam (Ni) as the carrier, Mn and Fe as the active components, and Co as a trace auxiliary was prepared using an impregnation method. The catalysts poisoned by Pb or Zn and Co-modified catalysts with Pb or Zn poisoning were studied. The addition of Pb or Zn significantly decreases the deNOx activity of the 3Mn10Fe/Ni catalyst due to the decrease in the content of high-valence metal elements such as Fe3+ and Mn4+, lattice oxygen concentration, reduction performance, acidity, and the number of acid sites. However, after Co modification, the deNOx activity of the poisoned catalysts can be improved effectively because the strong interaction between Pb or Zn and lattice oxygen is weakened, and the contents of lattice oxygen, high valence metal elements, reduction ability, and the number of acid sites increase. Keywords Heavy metals . Poisoning . Modification . 3Mn10Fe/Ni
Introduction The large amount of nitrogen oxide (NOx) emissions can form acid rain and combine with hydrocarbons to form photochemical smog, which will cause serious harm to the natural environment and humans (Zhang et al. 2015; Guo et al. 2015a). Therefore, it is urgent to take effective action to reduce NOx emissions. Much work has been done to reduce NOx emissions such as using advanced combustion and postcombustion reduction emission technologies. Among various NOx removal technologies, selective catalytic reduction of ammonia (NH3-SCR) is the most frequently used method (Liu et al. 2006); the most popularly used catalysts are V2O5-WO3/TiO2 and V2O5MoO 3 /TiO 2 , and their deNO x activity temperature is 300~400 °C (Ramis et al. 1990; Yue et al. 2015; Ciambelli Responsible Editor: Santiago V. Luis * Yunlan Sun [email protected] 1
School of Petroleum Engineering, Changzhou University, Changzhou 213164, Jiangsu, People’s Republic of China
2
School of Energy and Environment, Anhui University of Technology, Maanshan 243002, Anhui, People’s Republic of China
et al. 1996; Ramis et al. 1996; Luca et al. 2000). However, these catalysts have some significant disadvantages; for example, V2O5 is highly toxic and has a narrow activity temperature range. In addition, the catalyst reactor is generally installed before desulfurizing units and dust removing devices to convert NOx to N2 (Liu and Woo 2006). However, the disadvantage of the installation is that catalysts will be poisoned by dust-containing heavy metals, alkali metals, and SO2 (Lu et al. 2015; Putluru et al. 2015), which can reduce the length of catalyst life. The above problem can be alleviated if the SCR reactor is placed after
Data Loading...
