Low‐temperature CH4 Catalytic Combustion over Pd Catalyst Supported on Co3O4 Nanocrystals with Well‐Defined Crystal Planes

Hu, Linhua; Peng, Qing; Li, Yadong

doi:10.1002/cctc.201000407

Cited by 60 publications

(39 citation statements)

References 45 publications

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“…4d, showed two peaks at the binding energy of 337.1 eV for 3d5/2 and 342.5 eV for 3d3/2, respectively. The Pd5/2 binding energy was closed to the value of 336.9 which is a characteristic of Pd 2+ , indicating that the Pd doped in the as-prepared NiCo 1.95 Pd 0.05 O 4 sample (Giraudon et al 2007; Hu et al 2011; Ling et al 2015). …”

Section: Resultsmentioning

confidence: 99%

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Cai

Sun

et al. 2016

Environ Sci Pollut Res

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Selective catalytic reduction of NOX by hydrogen (H2-SCR) in the presence of oxygen has been investigated over the NiCo2O4 and Pd-doped NiCo2O4 catalysts under varying conditions. The catalysts were prepared by a sol-gel method in the presence of oxygen within 50–350 °C and were characterized using XRD, BET, EDS, XPS, Raman, H2-TPR, and NH3-TPD analysis. The results demonstrated that the doped Pd could improve the catalyst reducibility and change the surface acidity and redox properties, resulting in a higher catalytic performance. The performance of NiCo1.95Pd0.05O4 was consistently better than that of NiCo2O4 within the 150–350 °C range at a gas hourly space velocity (GHSV) of 4800 mL g−1 h−1, with a feed stream containing 1070 ppm NO, 10,700 ppm H2, 2 % O2, and N2 as balance gas. The effects of GHSV, NO/H2 ratios, and O2 feed concentration on the NO conversion over the NiCo2O4 and NiCo1.95Pd0.05O4 catalysts were also investigated. The two samples similarly showed that an increase in GHSV from 4800 to 9600 mL h−1 g−1, the NO/H2 ratio from 1:10 to 1:1, and the O2 content from 0 to 6 % would result in a decrease in NO conversion. In addition, 2 %, 5 %, and 8 % H2O into the feed gas had a slightly negative influence on SCR activity over the two catalysts. The effect of SO2 on the SCR activity indicated that the NiCo1.95Pd0.05O4 possesses better SO2 tolerance than NiCo2O4 catalyst does.Graphical abstractThe NiCo1.95Pd0.05O4 catalyst achieved over 90 % NO conversion with N2 selectivity of 100 % in the 200∼250 °C range than the maximum 40.5 % NO conversion over NiCo2O4 with N2 selectivity of approximately 80 % in 350 °C.

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Section: Resultsmentioning

confidence: 99%

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Cai

Sun

et al. 2016

Environ Sci Pollut Res

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“…[69] Pd/Co 3 O 4 nanosheets were reactive than Pd/Co 3 O 4 nanobelts and Pd/Co 3 O 4 nanocubes under the same Pd loading amount. The surface interaction between Pd 2+ and cobalt-oxygen group in Pd/ Co 3 O 4 nanosheets was revealed by HRTEM observation of the geometry match and by CH 4 -TPR experiment of the strong Pd enhancement reduction property based on the good coordination properties between the PdO unit cell and Co 3 O 4 unit cell on {112} planes.…”

Section: Supported Catalystsmentioning

confidence: 92%

Catalysis Based on Nanocrystals with Well‐Defined Facets

2011

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Using bottom-up chemistry techniques, the composition, size, and shape in particular can now be controlled uniformly for each and every nanocrystal (NC). Research into shape-controlled NCs have shown that the catalytic properties of a material are sensitive not only to the size but also to the shape of the NCs as a consequence of well-defined facets. These findings are of great importance for modern heterogeneous catalysis research. First, a rational synthesis of catalysts might be achieved, since desired activity and selectivity would be acquired by simply tuning the shape, that is, the exposed crystal facets, of a NC catalyst. Second, shape-controlled NCs are relatively simple systems, in contrast to traditional complex solids, suggesting that they may serve as novel model catalysts to bridge the gap between model surfaces and real catalysts.

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“…[207] The activity of Pd catalysts dispersed on oval-shaped CuO nanoparticles for Suzuki couplings was found to be higher than that of Pd catalysts dispersed on CuO nanorods, presumably because of the lower density of defects found in the first sample. The reactivity of Pd/Co 3 O 4 nanosheets was shown to be higher than that of Pd/Co 3 O 4 nanobelts or Pd/Co 3 O 4 nanocubes with the same Pd loading for low-temperature methane combustion, presumably because of stronger surface interactions between PdO and the (112) crystal planes of Co 3 O 4 exposed in the nanosheets.…”

Section: Effect Of Shape In Catalysis With Non-metallic Nanoparticlesmentioning

confidence: 96%

Shape‐Controlled Nanostructures in Heterogeneous Catalysis

2013

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Nanotechnologies have provided new methods for the preparation of nanomaterials with well-defined sizes and shapes, and many of those procedures have been recently implemented for applications in heterogeneous catalysis. The control of nanoparticle shape in particular offers the promise of a better definition of catalytic activity and selectivity through the optimization of the structure of the catalytic active site. This extension of new nanoparticle synthetic procedures to catalysis is in its early stages, but has shown some promising leads already. Here, we survey the major issues associated with this nanotechnology-catalysis synergy. First, we discuss new possibilities associated with distinguishing between the effects originating from nanoparticle size versus those originating from nanoparticle shape. Next, we survey the information available to date on the use of well-shaped metal and non-metal nanoparticles as active phases to control the surface atom ensembles that define the catalytic site in different catalytic applications. We follow with a brief review of the use of well-defined porous materials for the control of the shape of the space around that catalytic site. A specific example is provided to illustrate how new selective catalysts based on shape-defined nanoparticles can be designed from first principles by using fundamental mechanistic information on the reaction of interest obtained from surface-science experiments and quantum-mechanics calculations. Finally, we conclude with some thoughts on the state of the field in terms of the advances already made, the future potentials, and the possible limitations to be overcome.

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Low‐temperature CH₄ Catalytic Combustion over Pd Catalyst Supported on Co₃O₄ Nanocrystals with Well‐Defined Crystal Planes

Cited by 60 publications

References 45 publications

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Catalysis Based on Nanocrystals with Well‐Defined Facets

Shape‐Controlled Nanostructures in Heterogeneous Catalysis

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