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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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TL;DR: In this article, a continuous down flow process for the hydrocyclization of one of the biomass derived platform molecules such as levulinic acid over non-noble metal (nickel) based catalysts was provided.
119 citations
TL;DR: In this paper, controlled surface reactions (CSRs) and atomic layer deposition methods were used for the selective conversion of ethanol to ethyl acetate and for methanol synthesis, and the concentrations of Cu and ZrO2 interfacial sites were quantified using a combination of subambient CO Fourier transform infrared spectroscopy and reactive N2O chemisorption measurements.
Abstract: Well-defined Cu catalysts containing different amounts of zirconia were synthesized by controlled surface reactions (CSRs) and atomic layer deposition methods and studied for the selective conversion of ethanol to ethyl acetate and for methanol synthesis. Selective deposition of ZrO2 on undercoordinated Cu sites or near Cu nanoparticles via the CSR method was evidenced by UV–vis absorption spectroscopy, scanning transmission electron microscopy, and inductively coupled plasma absorption emission spectroscopy. The concentrations of Cu and Cu-ZrO2 interfacial sites were quantified using a combination of subambient CO Fourier transform infrared spectroscopy and reactive N2O chemisorption measurements. The oxidation states of the Cu and ZrO2 species for these catalysts were determined using X-ray absorption near edge structure measurements, showing that these species were present primarily as Cu0 and Zr4+, respectively. It was found that the formation of Cu-ZrO2 interfacial sites increased the turnover freque...
119 citations
TL;DR: The properties of PdZn surfaces have been examined using thermal desorption mass spectroscopy, core-and valence-level photoemission, and CO chemisorption as mentioned in this paper.
Abstract: The properties of PdZn surfaces have been examined using thermal desorption mass spectroscopy, core- and valence-level photoemission, and CO chemisorption. The formation of Pd-Zn bonds increases the binding energy of the core and valence levels of Pd and reduces the binding energy of the core and valence levels of Zn. An equiatomic PdZn alloy exhibits a large depletion of Pd(4d) states near the Fermi level and a shift of [approximately] +0.7 eV in the binding energy of the Pd(3d) levels. Ab initio SCF calculations for the PdZn molecule and Pd[sub n]Zn[sub n] (n = 2-4) clusters show a decrease in the electron population of the Pd(4d) orbitals as a consequence of Pd(4d) [yields] Zn(4p) charge transfer and Pd(4d) [yields] Pd(5s,5p) rehybridization. These electron transfers reduce electron-electron repulsion within a Pd atom, shifting its core and valence levels toward higher binding energy. The electronic perturbations induced by Zn on Pd reduce the CO-chemisorption ability of Pd by weakening the Pd(4d)-CO(2[pi]) bonding interactions. PdZn surfaces that are rich in Zn show Pd-CO bonds that are 12-16 kcal/mol weaker than those seen on pure Pd surfaces. 57 refs., 12 figs., 1 tab.
119 citations
TL;DR: In this paper, the effect of pre-adsorbed atoms on the dissociation of N2 and the adsorption of N, N2, and CO on Ru(0001) was studied.
119 citations
TL;DR: In this paper, the concentration of conduction band electrons was found to decrease during the first stages of water adsorption, probably due to Ti-OH species formation, and it was also found that the infrared spectrum of Ti−OH groups in the ν(OH) region is not influenced by the electronic state of the TiO2 surface.
119 citations