X-ray micro computed tomography characterization of cellular SiC foams for their applications in chemical engineering

Ou, Xiaoxia; Zhang, Xun; Lowe, Tristan; Blanc, Rémi; Rad, Mansoureh Norouzi; Wang, Ying; Batail, Nelly; Pham, Charlotte; Shokri, Nima; Garforth, Arthur; Withers, Philip J.; Fan, Xiaolei

doi:10.1016/j.matchar.2016.11.013

Cited by 46 publications

(25 citation statements)

References 59 publications

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“…The BJH pore size distribution of the TPAOH treated samples shows random mesopores and macropores in the range 10 nm to 160 nm (Figure 2b and Figure S1c), and the pore size increase with the concentration of TPAOH. In liquid phase reactions, the diffusivity of species is generally five orders of magnitude slower than that in the gas phase 28 , hence, open porosity (mesopore and macropore) is advantageous as it will facilitate molecular diffusion and increase the accessibili ty to the active sites that are located in the microporous channels from the outside 29,30 . As N2 sorption only provides the total porosity -including both open and close porosity -a complementary method is required to discriminate between the open and closed mesopore and macropores.…”

Section: Textural Propertiesmentioning

confidence: 99%

Inter-connected and open pore hierarchical TS-1 with controlled framework titanium for catalytic cyclohexene epoxidation

Jiao

Adedigba

et al. 2018

Catal. Sci. Technol.

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Section: Textural Propertiesmentioning

confidence: 99%

Inter-connected and open pore hierarchical TS-1 with controlled framework titanium for catalytic cyclohexene epoxidation

Jiao

Adedigba

et al. 2018

Catal. Sci. Technol.

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“…Similarly, by naively assuming an arrangement of regular dodecahedral cells, the average area of each pentagonal (strut-less) face can be thought to be about 7.8 × 10 4 µm 2 and thus contrasted to the average window area of 3.1 × 10 4 µm 2 reported by the same author for 100 ppi RVC. The values are comparable, but their difference confirms that only a combination of complex 3D structures of different sizes is analogous to the real material; see[58].…”

mentioning

confidence: 52%

X-ray computed micro-tomography of reticulated vitreous carbon

Arenas

Boardman

León

et al. 2018

Carbon

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The 3D structure of various grades of reticulated vitreous carbon (RVC) is studied by X-ray computed micro-tomography (µCT). The settings required to estimate the bulk volumetric surface area accurately are investigated and the results are compared to those obtained from scanning electron microscopy and from pressure drop measurements via the Ergun equation. A resolution of 1.3 µm per voxel in µCT imaging is needed to determine the volumetric surface area, but its value is highly dependent on post-processing. A resolution of 9.6 µm per voxel underestimated the volumetric surface area, Ae, by a factor of up to 0.64 due to an incomplete resolution of the cell struts. This latter resolution is, however, sufficient to establish the volumetric porosity and the relative density. Theoretical estimations of electrical resistivity using these properties are consistent with those reported in the literature. Cell volume and cell surface area distributions are then obtained from computational analysis of the digitally rendered structure of 100 ppi RVC. Both cases can be approximated by a gamma function. Suitable instrumental µCT conditions for performing metrological studies on bare and modified RVC are proposed. Opportunities for the modelling of decorated and coated digitally rendered RVC are discussed.

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“…As Fan et al . reported, open-cell SiC foams clearly are promising materials for continuous-flow chemical applications such as heterogeneous catalysis and distillation [ 2 , 3 ], the X-ray micro-computed tomography characterization results showed that the spatial voxel size of cellular β-SiC foams was 13.6 3 µm 3 , and diffusion coefficient of laminar flow within foams was dramatically increased. Xu et al .…”

Section: Introductionmentioning

confidence: 99%

Catalytic combustion of isopropanol over Co–ZSM-5 zeolite membrane catalysts in structured fixed-bed reactor

Zhang¹,

Yan²

2018

R. Soc. open sci.

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Catalytic combustion of isopropanol in the structured fixed-bed reactor was investigated over Co–ZSM-5 zeolite membrane catalysts. Firstly, ZSM-5 zeolite membrane catalysts with different Si/Al ratios were coated onto the surface of stainless steel fibres via secondary growth method and wet lay-up paper-making method. Then, cobalt oxides were loaded onto the zeolite membranes by impregnation method. The performance of catalytic combustion of isopropanol was conducted over the prepared zeolite membrane catalysts, and the experimental results showed that the catalyst with infinite Si/Al ratio has the highest catalytic activity for the combustion with the lowest T90 of isopropanol (285°C). Finally, the effects of bed structure, feed concentration, gas hourly space velocity and reaction temperature on the catalytic performance were investigated to analyse the kinetics of isopropanol over the catalyst with infinite Si/Al ratio in the structured fixed-bed reactor. The results showed that the longer residence time could cause higher reaction contact efficiency of isopropanol combustion. T90 of isopropanol can be dramatically decreased by 105°C in the fixed-bed reactor packed with Co–ZSM-5 zeolite membrane catalysts, compared to the fixed-bed reactor packed with granular catalyst.

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X-ray micro computed tomography characterization of cellular SiC foams for their applications in chemical engineering

Cited by 46 publications

References 59 publications

Inter-connected and open pore hierarchical TS-1 with controlled framework titanium for catalytic cyclohexene epoxidation

Inter-connected and open pore hierarchical TS-1 with controlled framework titanium for catalytic cyclohexene epoxidation

X-ray computed micro-tomography of reticulated vitreous carbon

Catalytic combustion of isopropanol over Co–ZSM-5 zeolite membrane catalysts in structured fixed-bed reactor

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