Exceptional -cdn.com



Exceptional Performance of Bimetallic Pt1Cu3/TiO2 Nanocatalysts for O2 Oxidation of Gluconic Acid and Glucose to Glucaric AcidXin Jin,1 Meng Zhao,1 Jian Shen,3 Wenjuan Yan,1,2 Liming He,1,5 Prem S. Thapa,4 Shenqiang Ren,3 Bala Subramaniam,1,2 Raghunath V. Chaudhari1,21Center for Environmentally Beneficial Catalysis, University of Kansas, 1501 Wakarusa Drive, Lawrence, Kansas 66047, USA2Department of Chemical and Petroleum Engineering, University of Kansas, 1530 W 15th St., Lawrence, Kansas 66045, USA3Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA 4Microscopy and Analytical Imaging Laboratory, Haworth Hall, 1200 Sunnyside Ave, University of Kansas, Lawrence, Kansas 66045, USA 5Beijing Research Institute of Chemical Industry, SINOPEC, Beijing, China1. TEM CharacterizationFigure S1. TEM Images of Monometallic Pt/TiO2 CatalystsIt is found that monometallic particles with 4.99 nm in size displays the highest activity for sodium gluconate oxidation. Thus it was chosen for detailed studies for performance comparison and reaction profiles. (a)(b)(c)Figure S2. TEM Characterization of Bimetallic PtCu Nanoparticles on TiO2 support (a) PtCu-c (1:1), (b) PtCu-c (1:2), (c) PtCu-c (1:3.5)2. SEM CharacterizationFigure S3. SEM Images of PtCu-c (1:3) SampleFigure S4. SEM Images of PtCu-g (1:3) SampleFigure S5. SEM Images of PtCu-s (1:3) Sample3. UV-vis of Cu/TiO2 and TiO2Figure S6. UV-vis spectra of Cu/TiO2 and TiO2 samples4. BET and Chemisorption DataProperties of catalyst support: TiO2 support used in this paper has a very low surface area (4.9 m2/g) with < 5 micrometers and 4.17 g/mL.Table S1. Chemisorption and ICP Results on Mono and Bimetallic Pt CatalystsCatalystSize from TEM (nm)Size from H2 sorption (nm)Pt content w% (ICP)Cu content w% (ICP)Pt4.995.430.52-Pt1Cu1-c4.144.550.540.13Pt1Cu2-c4.164.680.430.32Pt1Cu3-c4.024.210.480.51Pt1Cu3.5-c4.985.840.580.69Pt1Cu3-g4.406.510.490.59Pt1Cu3-s3.844.590.550.515. Reaction ResultsFigure S7. Activity and Selectivity of Pt/TiO2 Catalysts at 60 oC (left) and 45 oC (right). (Reaction condition: Sodium gluconate: 3.0 g, NaOH: 1.0 g, solid catalyst: 0.1 g, Conversion: 3~17%) Figure S8. Concentration vs Time Profiles of Sodium Gluconate Oxidation on Monometallic Bimetallic Catalysts at 45 oC and 60 oC as examples.Table S2. Activation Energy on Mono and Bimetallic Pt catalystsCatalystrate constant TemperatureEa (kJ/mol)45 oC60 oC70 oCPt1Cu3k140.82±4.3482.2±11.59110.6±11.436.6±0.94k27.16±0.9917.6±4.8035.62±0.2757.7±0.84k31.92±0.234.63±0.899.70±0.5057.8±2.15k45.47±1.8716.06±3.5233.12±3.9865.1±0.70Ptk15.41±0.4312.31±1.1316.61±0.1544.5±0.44k22.06±0.057.47±0.4815.62±0.2773.7±0.74k30.19±0.030.63±0.151.70±0.2077.8±5.44k41.67±0.194.96±0.658.86±1.3860.7±1.82Figure S9. A liquid chromatograph result from sodium gluconate oxidationAnalytic conditions: Liquid products were analyzed by Shimadzu HPLC with a Shodex SH1011 column. The specific analysis conditions are presented as follows: (1) 0.005 N H2SO4 in aqueous solution as the mobile phase, (2) 70 oC of column temperature and (3) 60 min of analysis time. ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download