Effect of different fuels on the alumina–zirconia nanopowder synthesized by sol–gel autocombustion method

Chandradass, J.; Jun, B.S.; Bae, Dong‐Sik

doi:10.1016/j.jnoncrysol.2008.02.018

Cited by 24 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peaks at 3594, 3510, and 1620 cm –1 are from H 2 O symmetric and asymmetric stretching and bending vibrations. 34 In Figure 7a, the peak at 532 cm –1 ascribes to Zr–O group deformation vibration, 35 and the strong band in the range of 965–1120 cm –1 is characteristic of PO 4 group stretching vibrations. 36 In Figure 7b, the peak at 2960 is assigned to −CH 3 stretching vibrations, the peaks at 2920 and 2850 are from −CH 2 stretching vibrations, and the band in the range of 1590–1650 cm –1 and the peak at 1202 cm –1 ascribe to −NH and −N–C stretching vibrations from C 6 H 13 NH 2 , which demonstrates the exfoliation of pristine α-ZrP by C 6 H 13 NH 2 .…”

Section: Resultsmentioning

confidence: 99%

Selective Hydrodeoxygenation of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran over Ni Supported on Zirconium Phosphate Catalysts

Zhu

Liu

et al. 2018

ACS Omega

View full text Add to dashboard Cite

Crystal α-zirconium phosphate (α-ZrP) was prepared by a hydrothermal method and exfoliated into a layered structure by n -hexylamine (C 6 H 13 NH 2 ). Ni-based catalyst (Ni/ZrP) was promoted by loading nickel on the layered α-ZrP via ion exchange. The catalyst was performed to catalyze hydrodeoxygenation of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF), and a 68.1% yield of DMF and 100% conversion of HMF were achieved at 240 °C, 5 MPa H 2 , and 20 h. The DMF yield can still retain 52.8% after five cycles. The characteristics of the catalyst were investigated via N 2 adsorption–desorption, X-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, pyridine-adsorbed Fourier transform infrared (FTIR) spectra, FTIR spectra, inductively coupled plasma mass spectrometry, and thermogravimetric analysis–mass spectrometry, as well as Raman spectroscopy. A pathway from HMF to DMF was found with MF as the intermediate product, and DMF production was preferable via the −CH 2 OH group hydrogenolysis of HMF over Lewis acidic sites of Ni/ZrP, which is caused by the zirconium vacant orbits.

show abstract

Section: Resultsmentioning

confidence: 99%

Selective Hydrodeoxygenation of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran over Ni Supported on Zirconium Phosphate Catalysts

Zhu

Liu

et al. 2018

ACS Omega

View full text Add to dashboard Cite

show abstract

“…The bands at 1505 and 1324 cm −1 corresponded to CH 3 and AlOH bending vibrations, respectively 62 . The peaks in the range from 800 to 500 cm −1 were ascribed to ZrO vibrations and AlO stretching vibrations in AlO 4 and AlO 6 63 …”

Section: Resultsmentioning

confidence: 94%

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Zhang

2020

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: The zirconium-containing metal-organic framework (MOF) UiO-66 was used as a cell to synthesize SO 4 2 − /ZrO 2 @Al 2 O 3 , a high-density superacid with relatively strong Brønsted acidity. The UiO-66 MOF was first coated with alumina to form ZrO 2 @Al 2 O 3. Impregnation with ammonium sulfate and calcination at 500°C afforded the bimetallic composite solid superacid SO 4 2− /ZrO 2 @Al 2 O 3. RESULTS: Scanning and transmission electron microscopy images confirmed that UiO-66 was successfully coated with aluminium oxide, and its octahedral structure and uniform size (400-600 nm) were retained. SO 4 2− /ZrO 2 @Al 2 O 3 had a Brunauer-Emmett-Teller specific surface area of 301-330 m 2 g −1 and average pore diameter of 9.6-10.7 nm. X-ray photoelectron spectroscopy and Fourier transform infrared analysis showed that SO 4 2− /ZrO 2 @Al 2 O 3 contained S 6+ and Al 3+. Temperatureprogrammed ammonia desorption analysis showed that SO 4 2− /ZrO 2 @Al 2 O 3 contained super-strong acid sites. The total volume of desorbed ammonia reached 90-109 cm 3 g −1. Infrared spectra of adsorbed pyridine indicated that SO 4 2− /ZrO 2 @Al 2 O 3 contained mainly Lewis acid sites and was relatively rich in Brønsted acid sites. Thermogravimetric analysis showed that the thermal stability of SO 4 2− /ZrO 2 @Al 2 O 3 was high. CONCLUSIONS: SO 4 2− /ZrO 2 @Al 2 O 3-3M (the impregnation concentration of ammonium sulfate was 3 mol L −1) and glucose were used to synthesize ethyl levulinate (EL) in ethanol. The highest EL yield of 37.5 mol% was obtained after reacting the mixture at 200°C for 5 h. An EL yield of 28.8 mol% was obtained after four consecutive reuses of the SO 4 2− /ZrO 2 @Al 2 O 3-3M catalyst.

show abstract

“…The bands at 690 cm -1 , 770 cm -1 and 1050 cm -1 correspond to the O-Al vibrations 48. The broad band at ~1600 cm -1 is attributed to the vibrations of acidic -OH bending mode and broad band at ~3450 cm -1 due to stretching mode with hydrogen bonding are present in all The FT-IR spectrum of ZA-SCM, ZA-IMG and ZA-PPT catalytic materials.…”

mentioning

confidence: 94%

Synthesis of 2,4,5-trisubstituted imidazoles, quinoxalines and 1,5-benzodiazepines over an eco-friendly and highly efficient ZrO₂–Al₂O₃ catalyst

Thimmaraju

Shamshuddin

2016

RSC Adv.

View full text Add to dashboard Cite

ZrO 2 -Al 2 O 3 containing 80 mole% of ZrO 2 was prepared by solution combustion, impregnation and precipitation methods. All the prepared catalytic materials were characterized by PXRD, NH 3 -TPD, N 2 adsorption isotherms, FTIR, TEM, SEM, EDAX and ICP-OES techniques. These prepared catalytic materials were used in a rapid, simple, versatile and efficient synthesis of 2,4,5-trisubstituted imidazoles under solvent-free conditions at moderate temperature in shorter reaction time (20 min). This is achieved by three-component cyclo-condensation of benzil, aldehydes and ammonium acetate with excellent yields. The derivatives of quinoxalines and 1,5-benzodiazepines were synthesized effectively by cyclo-condensation of 1,2-diamine with α-diketones and carbonyl compound with O-phenylenediamines respectively over ZrO 2 -Al 2 O 3 at moderate temperature (80 °C) for the reaction time of 20-40 min in presence of ethanol as a solvent. The present method is experimentally simple, non-toxic and involves inexpensive reagents, clean reaction pathways and eco-friendly catalyst. The catalytic materials used can be easily separated from the reaction mixture and reused for several reaction cycles without much loss of catalytic activity.

show abstract

Effect of different fuels on the alumina–zirconia nanopowder synthesized by sol–gel autocombustion method

Cited by 24 publications

References 6 publications

Selective Hydrodeoxygenation of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran over Ni Supported on Zirconium Phosphate Catalysts

Selective Hydrodeoxygenation of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran over Ni Supported on Zirconium Phosphate Catalysts

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Synthesis of 2,4,5-trisubstituted imidazoles, quinoxalines and 1,5-benzodiazepines over an eco-friendly and highly efficient ZrO₂–Al₂O₃ catalyst

Contact Info

Product

Resources

About

Effect of different fuels on the alumina–zirconia nanopowder synthesized by sol–gel autocombustion method

Cited by 24 publications

References 6 publications

Selective Hydrodeoxygenation of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran over Ni Supported on Zirconium Phosphate Catalysts

Selective Hydrodeoxygenation of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran over Ni Supported on Zirconium Phosphate Catalysts

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Synthesis of 2,4,5-trisubstituted imidazoles, quinoxalines and 1,5-benzodiazepines over an eco-friendly and highly efficient ZrO2–Al2O3 catalyst

Contact Info

Product

Resources

About

Synthesis of 2,4,5-trisubstituted imidazoles, quinoxalines and 1,5-benzodiazepines over an eco-friendly and highly efficient ZrO₂–Al₂O₃ catalyst