Influence of precursor of MgO and preparation conditions on the catalytic dehydrogenation of iso-propanol over CuO/MgO catalysts

El-Molla, Sahar A.; Abdel-all, S.M.; Ibrahim, M.M.

doi:10.1016/j.jallcom.2009.04.078

Cited by 17 publications

(12 citation statements)

References 34 publications

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“…In contrast, no diffraction peak of Cu 2 O or Cu is observed in the XRD profile of Cu 0.51 Mg 0.49 O x prepared by urea hydrolysis. This observation indicates that the incorporation of MgO results in the coexistence of zero, mono and divalent copper species in Cu 0.87 Mg 0.13 O x and a similar phenomenon was also reported by El‐Molla and co‐workers . However, further increase of MgO content probably leads to the formation of Cu 2 MgO 3 phase at the cost of Cu and Cu 2 O, and then resulted in the formation of Cu 0.51 Mg 0.49 O x catalyst.…”

Section: Resultssupporting

confidence: 85%

Hydrogenation of methyl levulinate to γ‐valerolactone over Cu─Mg oxide using MeOH as in situ hydrogen source

Cao

Wei

Liu

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND γ‐Valerolactone (GVL) is a versatile biomass‐derived platform molecule that could serve as a building block to produce chemicals, materials and fuels, but the production of GVL from biomass via a cost‐competitive method is challenging. In this contribution, a robust Cu─Mg oxide was prepared as an efficient bifunctional catalyst for both H2 production by MeOH reforming and hydrogenation of methyl levulinate (ML) to GVL in MeOH medium. RESULTS Cu0.87Mg0.13Ox prepared by a urea hydrolysis method offered a GVL yield up to 90.6% at 220°C in 4 h without external hydrogen. This catalyst could be reused for at least seven consecutive cycles without loss of its activity. Notably, Cu0.87Mg0.13Ox also provided nearly 70% GVL yield in methanolysis products of cellulose in the presence of humins. Characterization of the catalyst indicates that the incorporation of MgO greatly facilitates the stabilization of Cu+ species that possess a better catalytic performance in ML hydrogenation compared with metallic Cu. CONCLUSION This robust Cu0.87Mg0.13Ox could greatly contribute to develop a highly facile and desirable two‐step strategy for GVL production from cellulose, through the integration of ML production by methanolysis of cellulose, H2 formation by MeOH reforming and ML hydrogenation in MeOH medium. © 2018 Society of Chemical Industry

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Section: Resultssupporting

confidence: 85%

Hydrogenation of methyl levulinate to γ‐valerolactone over Cu─Mg oxide using MeOH as in situ hydrogen source

Cao

Wei

Liu

et al. 2018

J of Chemical Tech & Biotech

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“…A known mass of magnesium hydroxide (previously prepared [22] was impregnated with a solutions containing a known amount of copper nitrate dissolved in the least amount of distilled water and a solution containing different proportions of Zn( NO 3 ) 2 .6H 2 O. The obtained pastes were dried at 110 o C and then calcined at 350- Table (3).…”

Section: Methodsmentioning

confidence: 99%

Dehydrogenation Reactions of Methanol in Presence of Nanosized-ZnO/CuO/MgO System<strong> </strong>

El-Molla¹,

Ibrahim²,

Ebrahim³

2015

Proceedings of the 19th International Electronic Conference on Synthetic Organic Chemistry

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ABSTRATThe effect of ZnO-doping on the physicochemical and catalytic properties of CuO/MgO catalyst calcined at 350-650 o C was investigated. The catalysts were characterized by XRD, S BET techniques and the methanol conversion as the catalytic probe reaction. The results revealed that the crystallite size of CuO phase decreases by ZnO-doping. The BET surface area of samples increases by ZnO-doping.and catalytic activity of CuMgO catalyst increases by increasing the amounts of ZnO up to certain extent reaching to a maximum at 7.07 wt % ZnO above this concentration the activity decreases. The catalytic conversion of methanol and selectivity towards formaldehyde and methyl formate of pure powder catalyst increases by ZnO-doping.

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“…A known amount of magnesium hydroxide (previously prepared [24]) was impregnated with a solution containing a known amount of copper nitrate dissolved in the least amount of distilled water. The CuO content in all solid samples was fixed at 23 mol%.…”

Section: Experimental Materialsmentioning

confidence: 99%

Influence of ZnO doping and calcination temperature of nanosized CuO/MgO system on the dehydrogenation reactions of methanol

2016

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Pure and doped catalysts were prepared with ZnO dopant concentration (0.04-0.08 mol) by wet impregnation method followed by calcination at 350-650°C. The prepared solids were characterized by X-ray diffraction, N 2 -adsorption at -196°C and the methanol conversion as the catalytic probe reaction. The results revealed that the crystallite size and ordering of CuO phase decrease by ZnO-doping for samples calcined at 350-550°C. Opposite trends were observed by increasing ZnO amount to 0.08 mol (i.e. 9.21 wt%). The specific surface area (S BET ) and the catalytic activity of pure catalyst increase by increasing the calcination temperature to 550°C and/or increasing the amounts of ZnO up to certain extent reaching to a maximum at 7.07 wt% ZnO; above this concentration catalytic activity of doped samples decreases. But at calcination temperature above 550°C, the catalytic activity and selectivity decrease. The prepared catalysts are selective towards formaldehyde and methyl formate formation.

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Influence of precursor of MgO and preparation conditions on the catalytic dehydrogenation of iso-propanol over CuO/MgO catalysts

Cited by 17 publications

References 34 publications

Hydrogenation of methyl levulinate to γ‐valerolactone over Cu─Mg oxide using MeOH as in situ hydrogen source

Hydrogenation of methyl levulinate to γ‐valerolactone over Cu─Mg oxide using MeOH as in situ hydrogen source

Dehydrogenation Reactions of Methanol in Presence of Nanosized-ZnO/CuO/MgO System<strong> </strong>

Influence of ZnO doping and calcination temperature of nanosized CuO/MgO system on the dehydrogenation reactions of methanol

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