Promotional effect of nickel addition on soot oxidation activity of Ce 0.9 Pr 0.1 O 2 oxide catalysts
- PDF / 2,921,200 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 96 Downloads / 195 Views
ORIGINAL PAPER
Promotional effect of nickel addition on soot oxidation activity of Ce0.9Pr0.1O2 oxide catalysts Kirti Rajvanshi1 · Sunaina S. Patil1 · Lakhanlal1 · Hari Prasad Dasari1 · M. B. Saidutta1 · Harshini Dasari2 Received: 13 March 2020 / Accepted: 29 June 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract The present study investigates the promotional effect of Ni addition on soot oxidation activity of Ce0.9Pr0.1O2 oxide catalysts. A series of xNi-PDC (x= 0, 3, 5, 7, 10, 15, and 20 mol%) catalysts were synthesized by solution combustion synthesis method and characterized by XRD, Raman spectroscopy and TEM analysis. XRD and SAED patterns of the catalysts show cubic fluorite structure of ceria with an average crystallite size of 6–8 nm, and only 20Ni-PDC display NiO as a secondary phase. Raman spectra of xNi-PDC catalysts display an increase in oxygen vacancies. With a minimum addition of 10 mol% Ni to PDC, i.e., the 10Ni-PDC catalyst showed optimum soot oxidation activity (T50 = 360 °C) than compared to PDC and other Ni-PDC catalysts. Lattice strain and oxygen vacancies played a key descriptor role in showing better soot oxidation activity of the 10Ni-PDC catalyst. From the soot oxidation kinetic studies, the activation energy obtained by Ozawa plots for the 10Ni-PDC catalyst is 137 kJ/mol. Keywords Praseodymium-doped ceria · Nickel doping · Soot oxidation activity · Activation energy · Ozawa plots
Introduction Diesel engines, due to their higher power generation capability and good fuel economy, are extensively used in the transportation sector, especially in heavy-duty vehicles (Xin 2013). Particulate matter, i.e., soot produced during partial combustion of diesel fuel in fuel dense regions of the diesel engine (Pischinger et al. 1994) is a major contributor to air pollution and global warming (Ramanathan and Carmichael 2008) and is responsible for respiratory and cardiovascular diseases (Sydbom et al. 2001; Ristovski et al. 2012). Diesel particulate filter, an automotive exhaust emission control technology, traps soot from the exhaust of diesel engine and requires regeneration to avoid backpressure build-up due Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11696-020-01275-2) contains supplementary material, which is available to authorized users. * Hari Prasad Dasari [email protected] 1
Chemical Engineering Department, National Institute of Technology Karnataka, Mangalore 575025, India
Chemical Engineering Department, Manipal Institute of Technology, Manipal Academy of Higher Education (MAHE), Manipal 576104, India
2
to blockage, which otherwise may adversely impact engine operation. Since soot ignites around 600 °C and the temperature of exhaust gases is much lower than 600 °C (Adler 2005), appropriate soot oxidation catalysts need to be developed to burn off soot at lower temperatures (Bueno-López et al. 2005; Andana et al. 2016). CeO 2 has been intensely researched for its catalytic activity in soot oxidat
Data Loading...
