Supplementary Information

Effects of microporous TiO2 support on the catalytic and

structural properties of V2O5/microporous TiO2 for the selective

catalytic reduction of NO by NH3

Inhak Song†, Seunghee Youn†, Hwangho Lee†, Seung Gwan Lee‡, Sung June Cho‡, Do Heui

Kim*,†

†School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul

National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea

‡Department of Applied Chemical Engineering, Chonnam National University, Yongbong

300, Buk-gu, Kwangju 500-757, Korea

*Corresponding author: dohkim@snu.ac.kr

S1

Fig. S1. N2 adsorption-desorption isotherms of (a) VOx/DT-51 and (b) VOx/MP-TiO2 catalysts calcined at various temperature.

S2

Fig. S2. X-ray diffraction patterns of (a) VOx/DT-51 and (b) VOx/MP-TiO2 catalysts calcined at various temperature.

S3

Fig. S3. Differential thermal analysis of the samples under oxidative condition at a heating rate of 10 oC/min.

S4

Fig. S4. Normalized V K-edge XANES spectra of (a) VOx/DT-51 and (b) VOx/MP-TiO2

catalysts dried at 100 oC and calcined at 400 oC as well as reference materials. As shown above, vanadium on both titania before calcination step have similar geometric structure which is consistent with the structure of vanadium oxalate.

S5

Fig. S5. Normalized V K-edge XANES spectra of V2O3, V2O4, V2O5 and V precursor/MP-TiO2 (dried at 100 oC) samples. The valence of vanadium on TiO2 is closed to 4 before calcination.

S6

Fig. S6. In situ DRIFT spectra of NH3 desorption on (a) VOx/DT-51-500 and (b) VOx/MP-TiO2-500 as a function of temperature after the catalysts were saturated with chemisorbed NH3. Before experiment, samples were held at 400 oC under 2% O2 balanced with N2 flow for 1 h to fully oxidize the surface and cooled to the room temperature to obtain a background spectrum.

S7

Fig. S7. N2 adsorption-desorption isotherms of Microporous TiO2 and Titania nanotube calcined at 400 oC. Broad hysteresis was clearly seen in Titania nanotube, which indicates mesoporosity in sample. (Inlet: Pore size distribution curves of Microporous TiO2 and Titania nanotube)

S8

0.0 0.2 0.4 0.6 0.8 1.00

100

200

300

400

500 Microporous TiO2 (LiOH), (SBET=251m2/g) Titania Nanotube (NaOH), (SBET=235m2/g)

Adso

rbed

volum

e (cm

3 /g)

Relative pressure (p/p0)

10 100

0.00

0.01

0.02

0.03

0.04

0.05

0.06dV

/dD

(cm3 /g

nm)

Pore diameter (nm)