Topic
Chemisorption
About: Chemisorption is a research topic. Over the lifetime, 16298 publications have been published within this topic receiving 554989 citations.
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TL;DR: In this paper, the authors analyzed the effect of different support pre-treatment on the catalytic properties of Co catalysts and showed that the acetic acid-treated support has a negative effect on catalytic performance of Co catalyst, whereas the ammonium and ammonium nitrate-treated samples show pronounced effects on the catalyst performance.
Abstract: Alumina has been pretreated in the presence of medium and then used to prepare the supported Co catalysts. These modified supports and the respective catalysts have been thoroughly characterized by means of methods such as BET, pore size distribution, X-ray diffraction (XRD), ammonia temperature-programmed desorption (NH 3 -TPD), pyridine infrared spectroscopy (Py-FTIR), KBr-IR spectroscopy (FTIR), temperature-programmed reduction (TPR), oxygen titration, hydrogen chemisorption, in situ diffuse reflectance infrared Fourier transformation spectroscopy (DRIFTS) and CO hydrogenation to understand how chemically-treated alumina influences the properties of Co catalysts. These characterizations clearly show the changes of morphology (surface area, pore volume, pore size distribution and crystallite phase) as well as chemical properties (e.g. acidity) of the supports. Although the cobalt oxide crystallite sizes of the oxidic catalyst precursor are almost unaffected by different support pre-treatment, the reducibility of these catalysts vary greatly. And the support pre-treatment remarkably influences the adsorption and catalytic properties of these Co catalysts. The acetic acid-treated support has a negative effect on the catalytic properties of Co catalyst, whereas the ammonia and ammonium nitrate-treated samples show pronounced effects on the catalytic behaviors of Co catalysts.
137 citations
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TL;DR: In this paper, the initial stages of the oxidation of (110 and (100) chromium surfaces have been studied using low energy electron diffraction and Auger electron spectroscopy.
137 citations
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TL;DR: In this paper, the existence of at least three steps during the adsorption of methanol on alumina activated at 773 K was detected. But, at very low coverages, molecules coordinated on the strongest Lewis sites are evident, which easily transform into bridged methoxide species.
Abstract: Adsorption microcalorimetry and infrared measurements using CH/sub 3/OH, CD/sub 3/OH, and CHD/sub 2/OH show the existence of at least three steps during the adsorption of methanol on alumina activated at 773 K. At very low coverages, molecules coordinated on the strongest Lewis sites are evident, which easily transform into bridged methoxide species. With increasing coverage, another form, irreversibly adsorbed at room temperature but desorbed by evacuation at 373-473 K, becomes predominant. It is identified as undissociated methanol strongly hydrogen bonded on a cation-anion couple having a strong basic character. Finally, at high coverages a reversible form hydrogen bonded to basic sites is detected. 33 references, 7 figures, 1 table.
137 citations
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TL;DR: In this paper, a castor oil-based corrosion inhibitor (COCI) is used to suppress acidic corrosion at all concentrations, particularly at high temperatures, and the results demonstrate that the COCI has a considerable ability to suppress acidification at all levels.
137 citations
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TL;DR: In this paper, the H-Pt bond energy was found to be structure sensitive and sensitive both to local site geometry and long range order in the surface, and the specific contribution of atomic imperfections to the voltammetry curve was deduced from the ordered and countable imperfections occurring on high Miller index single crystal surfaces that have a stepped structure.
137 citations