A Simple and Rapid Method to Directly Synthesize TiO2/SBA-16 with Different TiO2 Loading and its Photocatalytic Degradation Performance on Rhodamine B

Wang

et al. 2011

Transition Met Chem

Au-Pd catalysts supported on SBA-16, SBA-16-CeO 2 , and CeO 2 had been studied for partial oxidation of methanol to produce H 2 . The physicochemical characteristics of the catalysts prepared by deposition-precipitation using urea hydrolysis were examined by inductively coupled plasma atomic emission spectroscopy (ICP-AES), Brunauer-Emmett-Teller (BET), X-ray powder diffraction (XRD), Temperature-programmed reduction (TPR), and H 2 temperature-programmed desorption (H 2 -TPD) analyses. The results show that Au x Pd y alloys are observed in Au-Pd/ SBA-16 and Au-Pd/SBA-16-CeO 2 catalysts. The catalytic results demonstrate that both Au-Pd/SBA-16 and Au-Pd/ SBA-16-CeO 2 catalysts exhibit higher activity and lower CO selectivity than the Au-Pd/CeO 2 catalyst. This could be ascribed to the formation of Au x Pd y alloys. The comparison of the Au-Pd/SBA-16 and Au-Pd/SBA-16-CeO 2 catalysts reveals that the Au-Pd/SBA-16-CeO 2 shows the lower CO selectivity, probably due to the presence of CeO 2 .

Section: Textural Characteristics Of Catalystssupporting

confidence: 82%

Catalytic partial oxidation of methanol over Au–Pd bimetallic catalysts: a comparative study of SBA-16, SBA-16-CeO2, and CeO2 as supports

Wang

et al. 2011

Transition Met Chem

“…However, the absence of active sites in the framework of these pure siliceous materials has limited their applications [3]. Many efforts have been devoted to the synthesis of metal-containing SBA-15 and SBA-16 type mesoporous materials by direct synthesis and impregnation methods [4][5][6][7][8][9][10][11]. Nevertheless, it is very difficult to incorporate metal species into the SBA-n silicious framework by direct synthesis due to the difficulties in the formation of metal-O-Si bonds under strongly acidic conditions [8].…”

Section: Introductionmentioning

confidence: 99%

One-pot Hydrothermal Synthesis of Mesoporous V-SBA-16 with a Function of the pH of the Initial Gel and its Improved Catalytic Performance for Benzene Hydroxylation

et al. 2012

V-SBA-16 catalysts with uniform cubic mesoporous structure were prepared by direct hydrothermal method as a function of the pH of the initial gel and characterized by ICP, XRD, TEM, N 2 adsorption-desorption, DRUV-vis and Raman spectra. The pH of the initial gel in synthesis of V-SBA-16 show important effects on the maintenance of well ordered mesoporous structure, introduced vanadium content and the incorporation of vanadium into the network of SBA-16 type mesoporous material. The initial gel system with a pH value of 2.0 was found to be a suitable for incorporation of vanadium and retaining the mesostructure of SBA-16. The catalytic activities of V-SBA-16 catalysts were evaluated for the hydroxylation of benzene using molecular O 2 as the oxidant. The highest phenol yield of 30.4% with a selectivity of 90% and turnover number of 105 were obtained over the VS-2.0 (1.67) sample prepared at the initial gel system with pH value of 2.0, which is attributed to its high V content and uniform framework V species that highly dispersed on the well ordered SBA-16 type mesoporous materials.

“…TiO 2 /SBA-15 materials were prepared according to our previous reported method with little modification. 35 In this case, the calculated amount of tetrabutyl titanate (TBT) was dissolved in ethanol in a volume ratio of 1 : 5. 0.5 g SBA-15 were then added to the solution containing different amount of TBT and stirred for 1 h to make the TBT adsorb completely on the SBA-15.…”

Section: Synthesis Of Tio 2 /Sba-15mentioning

confidence: 99%

Synthesis and structural characterization of novel visible photocatalyst Bi–TiO2/SBA-15 and its photocatalytic performance

Jia

et al. 2012

RSC Adv.

Self Cite

Bi-doped TiO 2 /SBA-15 (Bi-TiO 2 /SBA-15) was synthesized by a wet impregnation method. It was found that SBA-15 retained its ordered hexagonal mesostructure after incorporation of TiO 2 and Bi. TiO 2 nanoparticles and Bi species dispersed well and anchored both in the channel and the wall of SBA-15. The photocatalytic activity was evaluated on photodegradation of Rhodamine B (RhB) under visible light irradiation (l ¢ 420 nm). Experimental results indicated that Bi-TiO 2 /SBA-15 exhibited higher photocatalytic activities than pure TiO 2 and TiO 2 /SBA-15 owing to the synergetic effects of Bi species and TiO 2 . The degradation of RhB by these catalysts follows the pseudo-firstorder kinetic model and Bi-TiO 2 /SBA-15 (2.0%) was found to be the best. The effect of Bi doping on the photocatalytic activity was investigated by the density functional theory (DFT) method. The calculated results indicated that Bi doping could improve the photocatalytic activity by extending the spectral response from UV to the visible region, making the Bi-TiO 2 /SBA-15 active under visible light irradiation.