Electron tomography: a tool for 3D structural probing of heterogeneous catalysts at the nanometer scale

Architecture‐Dependent Distribution of Mesopores in Steamed Zeolite Crystals as Visualized by FIB‐SEM Tomography

“…[15][16][17][18] While both methods are fairly simple in terms of enhancing the molecular diffusion, until now not much is known about the uniformity and the size variations of the obtained mesopores. The main direct approach makes use of electron tomography (ET) and is still limited to materials not exceeding a few hundred nanometers, [19][20][21] while N 2 physisorption measurements only provide average information on the mesopore volume. [22] Furthermore, as known from our previous study on the molecular diffusion barriers in ZSM-5 zeolites, the crystals morphology and internal architecture define areas where straight and sinusoidal channels are open to the surface.…”

A “flip–flop” rotation stage for routine dual-axis electron cryotomography

“…The method has the potential to couple the exquisite spatial resolution of modern electron microscopes, which in some cases can now be even sub-Angstrom (Batson et al, 2002;Hosokawa et al, 2003), with threedimensional structure determination through a variety of reconstruction algorithms. Thus, electron tomography is emerging as a powerful new technique in both materials and life science research (Baumeister, 2004;Subramaniam and Milne, 2004;Ziese et al, 2004).…”

Understanding the effect of postsynthesis ammonium treatment on the catalytic activity of Au/Ti-SBA-15 catalysts for the oxidation of propene

“…The additional step of compressing the SBA-15 powder before conventional TEM sample preparation was found to be advantageous for imaging of the examined material. As shown in earlier work, imaging of small metal (oxide) particles in the pores of SBA-15 can be carried out by electron tomography [29][30][31]. However, for conventional TEM, imaging of small metal (oxide) particles through large or thick SBA-15 structures is difficult.…”