Topic
Temperature-programmed reduction
About: Temperature-programmed reduction is a research topic. Over the lifetime, 2924 publications have been published within this topic receiving 97092 citations.
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TL;DR: In this paper, the results of a variety of catalyst characterization and reaction kinetics measurements were presented, including surface area/pore volume measurements, temperature programmed reduction by H2 (H2-TPR), NH3 temperature programmed desorption (NH3-TPD), and DRIFTS and solid-state nuclear magnetic resonance (NMR) spectroscopies.
319 citations
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TL;DR: In this article, the impregnation step can be explained in terms of interfacial coordination chemistry, and the choice of solvent, metal salt, and of the carrier is of great importance in the degree of reduction that can be achieved at normal reduction temperatures and catalyst dispersion.
310 citations
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TL;DR: In this paper, the structure of rhodium in an ultradispersed 0.57 wt % Rh/y-Al,O, catalyst before and after CO adsorption was studied with extended X-ray absorption fine structure (EXAFS), XPS, electron spin resonance (ESR), temperature programmed reduction (TPR), CO infrared spectroscopy, and H2 and CO chemisorption.
Abstract: The structure of rhodium in an ultradispersed 0.57 wt % Rh/y-Al,O, catalyst before and after CO adsorption was studied with extended X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR), temperature programmed reduction (TPR), CO infrared spectroscopy, and H2 and CO chemisorption. With the aid of these complementary techniques, it could be established that the structure of the rhodium catalyst was completely different before and after CO adsorption. Before CO adsorption and after reduction of the catalyst at 593 K, all the rhodium was reduced and in the form of three-dimensional metallic crystallites. CO adsorption disrupted the metal-metal bonds in the crystallites, leading to isolated rhodium geminal dicarbonyl species in which the rhodium was present as Rh'. Each rhodium ion was surrounded by two carbon monoxide molecules and three oxygen anions of the support.
291 citations
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TL;DR: In this article, the surface area/pore volume measurements, temperature programmed reduction (TPR), and Electron Paramagnetic Resonance (EPR) spectroscopy were used to characterize the performance of catalysts.
281 citations
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TL;DR: In this article, it was shown that there are two causes for a strong interaction between nickel species and the support: incorporation of nickel ions in the surface layers of the support during impregnation, and solid-state diffusion during calcination of the catalysts.
274 citations