SUPPLEMENTARY MATERIALS
Promotion effect of rare earth metal (Ce, Nd, Pr) on physicochemical properties of M-Al mixed oxides (M = Cu, Ni, Co) and their catalytic activity in N2O decomposition
Phuoc Hoang Hoa,b,c,†, Magdalena Jabłońskaa,d,e*, Giada Beltramif, Annalisa Martuccif, Thomas Cacciaguerrac, Werner Paulusc, Francesco di Renzoc**, Giuseppe Fornasarib, Angelo Vaccarib, Patricia Benitob***, Regina Palkovitsa,d
aChair of Heterogeneous Catalysis and Chemical Technology, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany
bDepartment of Industrial Chemistry “Toso Montanari”, Alma Mater Studiorum-Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
cICGM, Univ Montpellier-CNRS-ENSCM, 240 Avenue Emile Jeanbrau,34296 Montpellier, France
dCenter for Automotive Catalytic Systems Aachen, RWTH Aachen University, Schinkelstr. 8, 52062 Aachen, Germany
eInstitute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
fDepartment of Physics and Earth Science, University of Ferrara, Via Saragat 1, 44122 Ferrara, Italy
†Present address: Chemical Engineering, Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
Corresponding author. E-mail address: *magdalena.jablonska@uni-leipzig.de (M. Jabłońska),
**Francesco.Di-Renzo@enscm.fr (F. Di Renzo), ***patricia.benito3@unibo.it (P. Benito)
Table S1. Structural data derived from XRD analysis.
Sample code
Crystalline phase
Mass
% Space group a b c Angle / Scherrer
crystallite size / nm
CuAl CuO 100 C2/c (15) 4.708 3.4232 5.128 11.4
CeCuAl CuO 42 C2/c (15) 4.87 3.29 5.13 11.4
CeO2 58 Fm-3m (225) 5.43 5.43 5.43 3.9
NdCuAl
CuO 46 C2/c (15) 4.68 3.438 5.116 12.4
Nd2O3 6 P-3ml (164) 3.912 3.912 6.09 γ = 120 n.a.
CuNd2O4 48 I4/mmm (139) 3.943 3.943 12.22 12.5 PrCuAl
CuO 41 C2/c (15) 4.675 3.437 5.119 11.9
PrO2 32 Fm-3m (225) 5.43 5.43 5.43 5.9
CuPr2O4 27 I4/mmm (139) 3.961 3.961 12.24 13.1
NiAl NiO 100 Fm-3m (225) 4.158 4.158 4.158 4.4
CeNiAl NiO 45 Fm-3m (225) 4.18 4.18 4.18 4.2
CeO2 55 Fm-3m (225) 5.43 5.43 5.43 8.1
NdNiAl NiO 53.4 Fm-3m (225) 4.1762 4.1762 4.1762 3.0
Nd2O3 46.6 C2/m (12) 14.279 3.701 8.932 β = 99.48 3.6 PrNiAl
NiO 43 Fm-3m (225) 4.134 4.134 4.134 3.9
PrO2 37 Fm-3m (225) 5.395 5.395 5.395 14.6
Pr6O11 20 Fm-3m (225) 5.475 5.475 5.475 18.0
CoAl Co3O4 100 Fd-3m (227) 8.068 8.068 8.068 15.2
CeCoAl Co3O4 41 Fd-3m (227) 8.071 8.071 8.071 8.6
CeO2 59 Fm-3m (225) 5.4048 5.4048 5.4048 9.1
NdCoAl
Co3O4 40 Fd-3m (227) 8.072 8.072 8.072 4.2
Nd2O3 24 Ia-3 (206) 11.939 11.939 11.939 n.a
Nd2O3 4 P-3ml (164) 3.912 3.912 6.09 γ = 120 n.a.
NdCoO3 32 Pnma (62) 5.3482 7.5332 5.317 15.5
PrCoAl
Co3O4 43 Fd-3m (227) 8.049 8.049 8.049 6.9
PrO2 26 Fm-3m (225) 5.3853 5.3853 5.3853 19.6
Pr6O11 31 Fm-3m (225) 5.4692 5.4692 5.4692 23.7 Note: mass percent is calculated only on observed crystalline phases.
To verify the reliability of H2-TPR measurements, a complementary set of tests was done on a different apparatus namelya Quantachrome ChemBET Pulsar TPR/TPD. Prior to measurement, catalysts (30 mg) were activated at 600 C for 1 h in pure Ar (20 ml min-1), and subsequently cooled down to 40 oC. H2-TPR runs were carried out starting from 40 to 1000 C, with a ramping rate of 10 K min-1 and in a flow (25 ml min-1) of 5.0 vol.% H2/Ar. Water vapor was condensed from effluent gas using a cold trap placed in an ice-water bath. The H2-TPR curves reported in Figure S1 confirm the succession of phenomena observed on Autochem apparatus, however, all signals being shifted to higher temperatures due to the different experimental settings.
Figure S1. H2-TPR trances of different RMAl mixed metal oxides with R = Nd, Ce, Pr and M = Cu, Ni, Co (measured at a Quantachrome ChemBET Pulsar TPR/TPD).
