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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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Journal ArticleDOI
TL;DR: In this article, the authors showed that CO is molecularly adsorbed on Co(0001) in the investigated temperature range from 100 to 450 K. This was deduced from the UPS and EELS results and the reversibility of the sp and LEED data.

132 citations

Journal ArticleDOI
TL;DR: The surface chemistry of pure AlPO4 was studied by infra-red spectroscopy in an attempt to explain why this material shows low catalytic activity despite its high acidity as mentioned in this paper.
Abstract: The surface chemistry of pure AlPO4 was studied by infra-red spectroscopy in an attempt to explain why this material shows low catalytic activity despite its high acidity. Two major bands (3680 and 3800 cm–1) in spectra of dry AlPO4 were shown to represent chemically distinct types of surface OH groups. The band at 3800 cm–1 is assigned to Al—OH and that at 3680 cm–1 to P—OH. Study of adsorbed NH3 and pyridine showed both Lewis and Bronsted acid sites on the surface. Chemisorption of NH3 also produced NH2 and OH groups, showing the presence of “strained” oxide links. Adsorption of CO2 and HCI revealed very few “α-sites” or reactive surface oxide ions. The evidence suggests that the surface largely resembles a prism face (10text-decoration:overline10) of tridymite-form AlPO4, holding vicinal pairs of OH groups, with one group attached to Al and the other to P. Condensation produces acidic Al—O—P links in which O is held primarily by the P atom. The inactivity of AlPO4 probably reflects the inadequacy of PO groups as base sites rather than a lack of suitable acid sites.

132 citations

Journal ArticleDOI
TL;DR: The combination of the DFT calculations with hydrogen chemisorption data and the analysis of the Pt L(3) X-ray absorption spectra implies that both the H coverage and/or the type of active Pt surface sites, which are present at high temperature catalytic reaction conditions, strongly depend on the ionicity of the support.
Abstract: Pt L3 X-ray absorption edge data on small supported Pt particles (N < 6.5) reveals that at very low H2 pressure or high temperature the strongest bonded H is chemisorbed in an atop position. With decreasing temperature or at higher H2 pressure only n-fold (n = 2 or 3) sites are occupied. At high H2 pressure or low temperature, the weakest bonded H is positioned in an “ontop” site, with the chemisorbing Pt already having a stronger bond to a H atom in an n-fold site. DFT calculations show that the adsorption energy of hydrogen increases for Pt particles on ionic (basic) supports. The combination of the DFT calculations with hydrogen chemisorption data and the analysis of the Pt L3 X-ray absorption spectra implies that both the H coverage and/or the type of active Pt surface sites, which are present at high temperature catalytic reaction conditions, strongly depend on the ionicity of the support. The consequences for Pt catalyzed hydrogenolysis and hydrogenation reactions will be discussed.

132 citations

Journal ArticleDOI
TL;DR: In this paper, a low surface area silica was used to support the preparation of nickel metal nanoparticles for hydrogenation of benzene, and the catalysts were characterized by atomic absorption, XRD, TEM, BET surface area, and H 2 chemisorption and TPD.

132 citations

Journal ArticleDOI
TL;DR: In this paper, a volcano-type plot of the rate of methanol formation and forming a hysteresis loop was investigated over industry-like catalysts based on Cu-ZnO-Al2O3, under methanoline synthesis conditions (513 K, 5.0 MPa).

131 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023567
20221,044
2021538
2020424
2019458
2018350