ChemInform Abstract: SURFACE SPECTROSCOPIC CHARACTERIZATION OF COPPER/ALUMINA CATALYSTS

Strohmeier, Brian R.; Leyden, Donald E.; Field, R. S.; Hercules, D. M.

doi:10.1002/chin.198545033

Cited by 23 publications

(30 citation statements)

References 1 publication

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“…CuO displays two components at 933.4 and 935.0 eV in sample CP-60, while MET/10-34 exhibits only one symmetrical peak at 933.5 eV. After exposure to hydrogen at 250 • C, both samples display a peak shift to 932.5-932.7 eV, indicative of Cu 0 formation [14,38,39,41,[43][44][45][46]. A composite peak at 934.3-934.6 eV is also visible in both samples, indicating that Cu is not completely reduced.…”

Section: Catalyst Redox Cyclesmentioning

confidence: 98%

“…Both exhibit a pronounced shoulder around 150 • C and the temperature required for complete oxidation (approximately Table 3 Auger parameters and binding energies of the core electrons for catalysts CP-60 and MET/10-34 determined by X-ray photoelectron spectroscopy after exposure to various conditions, i.e. The characteristic CuO [14,[37][38][39][40][41][42][43][44][45] and ZnO [14,41,44] features are observed in the calcined samples. CuO displays two components at 933.4 and 935.0 eV in sample CP-60, while MET/10-34 exhibits only one symmetrical peak at 933.5 eV.…”

Section: Catalyst Redox Cyclesmentioning

confidence: 99%

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Production of hydrogen from methanol over binary Cu/ZnO catalysts

Agrell

Boutonnet

Melián‐Cabrera

et al. 2003

Applied Catalysis A: General

161

145

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Section: Catalyst Redox Cyclesmentioning

confidence: 98%

Section: Catalyst Redox Cyclesmentioning

confidence: 99%

Production of hydrogen from methanol over binary Cu/ZnO catalysts

Agrell

Boutonnet

Melián‐Cabrera

et al. 2003

Applied Catalysis A: General

161

145

View full text Add to dashboard Cite

“…In the calcined catalyst, CuO displays the characteristic peak at 934.3 eV [22,37,45,[48][49][50][51][52][53][54]. After exposure to H 2 , the peak shifts to 932.4 eV, indicative of Cu 0 formation [22,37,48,50,[52][53][54][55]]. The reduced sample was then exposed to O 2 /CH 3 OH.…”

Section: The Oxidation State Of Coppermentioning

confidence: 99%

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

Agrell

Birgersson

Boutonnet

et al. 2003

Journal of Catalysis

368

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“…Another possible chemical state of Cu in the regenerated adsorbent is cuprous oxide (Cu 2 O) or Cu 0 , for which the binding energy of Cu 2P 3/2 is approximately 932.6 eV. 22 This can be explained from the reactions during the PH 3 adsorption and the following regeneration of air purging and oxidation. The reaction during the PH 3 adsorbed on Cu/Al 2 O 3 can be inferred to be similar to the reaction between AsH 3 and Cu-Cr/AC adsorbent, 17 at which CuO was reduced to Cu 0 whereas PH 3 was oxidized to less valence of phosphorus.…”

Section: Regeneration and Surface Analysis Ofmentioning

confidence: 99%

“…Before adsorption, the Cu 2p 3/2 peak centered at 933.6 eV can be assigned to CuO. 22,23 After adsorption and air purging (regeneration), the peak shifted to the lower binding energy. This indicates that the Cu exists with a chemical state other than the CuO form.…”

Section: Regeneration and Surface Analysis Ofmentioning

confidence: 99%

Copper Loaded on Sol-Gel-Derived Alumina Adsorbents for Phosphine Removal

Hsu

Bai

et al. 2010

Journal of the Air & Waste Management Association

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The hydride gas of phosphine (PH 3 ) is commonly used for semiconductor and optoelectronic industries. The local scrubbers must immediately abate it because of its high toxicity. In this study, copper (Cu) loaded on the sol-gelderived ␥-alumina (Al 2 O 3 ) adsorbents are prepared and tested to investigate the possibility of PH 3 removal and sorbent regeneration. Test results showed that during the breakthrough time of over 99% PH 3 removal efficiency, the maximum adsorption capacity of Cu loaded on the sol-gel-derived ␥-Al 2 O 3 adsorbent is 18 mg-PH 3 /gadsorbent. This is much higher than that of Cu loaded on the commercial ␥-Al 2 O 3 adsorbent-8.6 mg-PH 3 /gadsorbent. The high specific surface area, narrow pore size distribution, and well dispersion of Cu loaded on the sol-gel-derived ␥-Al 2 O 3 could be the reasons for its high PH 3 adsorption capacity. The regeneration test shows that Cu loaded on the sol-gel-derived ␥-Al 2 O 3 adsorbent can be regenerated after a simple air purging procedure. The cumulative adsorption capacity for five regeneration cycles is 65 mg-PH 3 /g-adsorbent, which is approximately double that of the Cu/zeolite adsorbent demonstrated in the literature. INTRODUCTIONThe hydride gas of phosphine (PH 3 ) is used in large quantity for semiconductor, liquid crystal display (LCD), and light-emitting diode (LED) manufacturing industries in various processes. The unutilized PH 3 gas must be abated right after the process tool because of its high toxicity and flammability. In addition, the PH 3 gas is thought to be an airborne molecular contaminant (AMC), which decreases the product yield. Dry chemical adsorption is a preferred method used for hazardous gas removals from these manufacturing factories. It can treat PH 3 effectively, 1-3 especially when the PH 3 coexists with arsine (AsH 3 ) in the exhaust gases. However, commercialized dry chemical adsorbents cannot be reused and they must be treated as hazardous wastes. Thus it is essential to develop a regenerative adsorbent for reducing the amount of hazardous waste production.Earlier researchers 4 treated PH 3 by carbon dry adsorption. The capacity of activated carbon (AC) can reach approximately12 mg-PH 3 /g-AC at 140°C 5 ; however, its disadvantage is its inflammability. 6 The spent carbon might react exothermically with air and result in spontaneous combustion. Thus the AC adsorbent is not practically acceptable in abating the toxic hydride gases for the semiconductor and optoelectronic industries. Li et al. 7 used metal (Cu, Zn, or Mn)-loaded ZSM-5 and Y zeolite adsorbents for the adsorption of PH 3 toxic gas. Their results showed that more than 99% PH 3 adsorption efficiency was achieved when zeolites were loaded with Cu. However, they also revealed that PH 3 removal efficiencies

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ChemInform Abstract: SURFACE SPECTROSCOPIC CHARACTERIZATION OF COPPER/ALUMINA CATALYSTS

Abstract: Aus ESCA‐, ISS‐, PAS‐ und XRD‐Untersuchungen an einer Reihe von imprägnierten Cu/ Al2O3‐Katalysatoren geht hervor, daß die Oberflächeneigenschaften der Katalysatoren sowohl von der Metallbeladung als auch von derCalcinierungstemp. beein‐ 8 flußt werden.

Cited by 23 publications

References 1 publication

Production of hydrogen from methanol over binary Cu/ZnO catalysts

Production of hydrogen from methanol over binary Cu/ZnO catalysts

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

Copper Loaded on Sol-Gel-Derived Alumina Adsorbents for Phosphine Removal

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