Lateral interactions in the thermal desorption of H2 from clean Cu/Ni(110) alloy surfaces

Silverman, Edward; Madix, Robert J.; Delrue, P.

doi:10.1016/0039-6028(81)90516-1

Cited by 22 publications

(4 citation statements)

References 9 publications

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“…This indicated that the adsorption of H 2 at the Cu sites of the 20C–5N/Z catalyst was activated by the presence of Ni. For the 20C–5N/Z catalyst, H 2 could be dissociated at the Ni sites; the dissociated H atoms spilled over the adjacent Cu sites, and the weak H binding at the Cu sites could facilitate the desorption of H 2 at low temperatures. , Two main desorption peaks at 464 and 528 °C were observed in the H 2 –TPD profile of the trimetallic 20C–5N–2Z/Z catalyst. The desorption temperatures of the trimetallic 20C–5N–2Z/Z catalyst were much lower than those of the monometallic 20Cu/Z, 5N/Z, and 2Z/Z catalysts.…”

Section: Results and Discussionmentioning

confidence: 97%

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Trimetallic Cu–Ni–Zn/H-ZSM-5 Catalyst for the One-Pot Conversion of Levulinic Acid to High-Yield 1,4-Pentanediol under Mild Conditions in an Aqueous Medium

et al. 2021

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The one-pot direct conversion of levulinic acid (LA) to 1,4-pentanediol (1,4-PDO) was investigated over a trimetallic Zn-promoted Cu–Ni alloy on a H-ZSM-5 (Cu–Ni–Zn/H-ZSM-5) catalyst. Under mild reaction conditions at 130 °C and a H2 pressure of 2.5 MPa for 6 h in an aqueous medium, almost complete conversion of LA to high-yield 1,4-PDO (93.4%) was achieved. The presence of the Zn promoter effectively suppressed the growth of the Cu–Ni alloy nanoparticles (NPs) on the surface of H-ZSM-5. Consequently, the reducibility of the Cu–Ni–Zn alloy was much higher than that of the Cu–Ni alloy. The numerous Lewis acid sites of the Cu–Ni–Zn/H-ZSM-5 catalyst enhanced the adsorption of LA, and the adsorbed LA was converted to γ-valerolactone (GVL) at the Brønsted acid sites of H-ZSM-5 followed by hydrogenation at the Cu–Ni alloy sites. Subsequently, the readsorption of GVL was activated at the Lewis acid sites and GVL underwent ring opening, followed by hydrogenation to form 1,4-PDO at the Cu–Ni alloy sites. The H2 spillover on the Zn-promoted Cu–Ni alloy NPs enhanced the hydrogenation of LA to 1,4-PDO. Because of the mild reaction conditions, the formation of coke and active site sintering was highly suppressed. In addition, metal leaching did not occur over the trimetallic Cu–Ni–Zn/H-ZSM-5 catalyst. Consequently, the Cu–Ni–Zn/H-ZSM-5 catalyst could be used for up to five cycles with minimal activity loss.

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Section: Results and Discussionmentioning

confidence: 97%

“…For the 20C−5N/Z catalyst, H 2 could be dissociated at the Ni sites; the dissociated H atoms spilled over the adjacent Cu sites, and the weak H binding at the Cu sites could facilitate the desorption of H 2 at low temperatures. 74,75 Two main…”

Section: Methodsmentioning

confidence: 99%

Trimetallic Cu–Ni–Zn/H-ZSM-5 Catalyst for the One-Pot Conversion of Levulinic Acid to High-Yield 1,4-Pentanediol under Mild Conditions in an Aqueous Medium

et al. 2021

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“…The selective hydrogen chemisorption was used to measure the surface active Ni sites on Cu-Ni catalysts. 1,21,22,24,29,38 But Crucq and co-workers found hydrogen spillover from Ni to Cu on Cu-Ni bimetallic surfaces, 39 which can lead to over counting of surface Ni sites in the hydrogen selective chemisorption. 32 CO has been used as a probe molecule to study the surface structure and composition of Cu-Ni bimetallic catalysts.…”

Section: Introductionmentioning

confidence: 99%

In situ IR spectroscopic studies of Ni surface segregation induced by CO adsorption on Cu–Ni/SiO2 bimetallic catalysts

Yao

Goodman

2014

Phys. Chem. Chem. Phys.

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It is of great importance to study the catalytic structures under real reaction conditions especially for the bimetallic catalysts, where facile surface restructure or surface segregation can be driven by adsorbate adsorption. Here, we report CO interaction with Cu-Ni/SiO2 bimetallic model catalysts studied by CO temperature programmed desorption (TPD) and in situ CO polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) under CO pressures varying from ultrahigh vacuum (UHV) to near ambient pressure. Under UHV conditions, Cu is enriched on the surface of Cu-Ni/SiO2 bimetallic catalysts. CO spillover from Cu to Ni on Cu-Ni/SiO2 bimetallic catalysts has been observed at about 200 K under UHV conditions. In situ CO PM-IRRAS shows surface segregation of Ni on the Cu-Ni/SiO2 bimetallic catalysts induced by CO adsorption at ambient pressure CO. The behavior of CO induced surface segregation can lead to severe errors in Ni active site measurements by the selective CO chemisorption on Cu-Ni/SiO2 bimetallic catalysts.

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“…Surface analysis of Raney nickel alloys was performed with XPS, AES, and SIMS (497). The adsorption of hydrogen on Ni-Cu alloys was followed with flash desorption spectroscopy (834) and only at Cu concentrations greater than 25% was hydrogen coverage at saturation affected. The oxidation of Ni-Fe alloys was studied with AES and electron diffraction (349) as well as with XPS (121).…”

Section: Metalsmentioning

confidence: 99%

Forensic science

Brettell¹,

Saferstein²

1983

Anal. Chem.

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He Joined the company in 1959 as a radiochemist. His current work is directed toward developing advanced techniques for semiconductor materials characterization using electron beam (scanning Auger) and in microprobe techniques for chemical imperfections. X-ray topography, and scanning transmission electron microscopy techniques for physical imperfections. Larrabee earned a B.Sc. from the University ol Bishop's College In Quebec and an M.Sc. in chemistry from McMaster University in Ontario, Canada. He has published in analytical, electrochemical, and instrumentation journals and contributed chaplers In books. He has coauthored a book on the characterization of semiconductor materials and coedited a book on the characterization of solid surfaces. Larrabee is a member of the ACS, Electrochemical Society, SAS, and the Dallas Society of Analytical Chemists. R. Allen Bowling received his B.S. In Chemistry from the University ol Alabama and a Ph.D. In Chemistry from ihe University of Tennessee.He held an Alexander von Humboldt postdoctoral research position at the Institute ol Inorganic Chemistry, University of Frankfurt, West Germany, from March 1979 to July 1980. He joined Texas Instruments Incorporated in September 1980 as a process control engineer in a semiconductor processing area. In January 1982, he became a member of the technical staff in the Materials Characterization Branch of the Materials Science Laboratory of Texas Instruments, where he is presently responsible for Auger and XPS instrumentation. Bowling is a member of the Electrochemical Society and the American Vacuum Society.

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Lateral interactions in the thermal desorption of H2 from clean Cu/Ni(110) alloy surfaces

Cited by 22 publications

References 9 publications

Trimetallic Cu–Ni–Zn/H-ZSM-5 Catalyst for the One-Pot Conversion of Levulinic Acid to High-Yield 1,4-Pentanediol under Mild Conditions in an Aqueous Medium

Trimetallic Cu–Ni–Zn/H-ZSM-5 Catalyst for the One-Pot Conversion of Levulinic Acid to High-Yield 1,4-Pentanediol under Mild Conditions in an Aqueous Medium

In situ IR spectroscopic studies of Ni surface segregation induced by CO adsorption on Cu–Ni/SiO2 bimetallic catalysts

Forensic science

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