Synthesis of heteropolyacid (H3PW12O40)/SiO2 nanoparticles and their catalytic properties

Kim, Hyun Jong; Shul, Yong Gun; Han, Haksoo

doi:10.1016/j.apcata.2005.10.010

Cited by 60 publications

(40 citation statements)

References 40 publications

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“…The catalytic properties of HPA in the silica nano phase might be different from those in the bulk base due to the physico-chemical differences of nano phase [141].…”

Section: Alcohol Oxidationmentioning

confidence: 99%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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Heteropolyacids, their salts and polyoxometalates have been used as catalysts in wide range of organic reactions such as multi components, oxidation, reductions, electrochemical and photochemical reactions. There have been tremendous and continued efforts to modify the catalytic performance of heteropoly acids such as supporting them on MCM, silica gel, etc. In this review, we have attempted to bring some of new applications of heteropolyacids in organic reactions and recent approaches on modifying them, into focus.

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“…The catalytic properties of HPA in the silica nano phase might be different from those in the bulk base due to the physico-chemical differences of nano phase [141].…”

Section: Alcohol Oxidationmentioning

confidence: 99%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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“…Among the supports that have been mentioned in different papers are: salts of heteropolyacids [6,7], Electronic supplementary material The online version of this article (doi:10.1007/s10934-015-0072-0) contains supplementary material, which is available to authorized users. zeolites [8], mesoporous silica [9][10][11], titania [12,13], active carbon [14,15], polymeric materials [16,17] and different molecular sieves: MCM-41, SBA-15, SBA-3, HMS [18][19][20][21][22][23][24][25][26][27][28]. Mesoporous molecular sieves such as SBA-15, highly stable and with better textural properties compared to other supports seem to be suitable for depositing HPA.…”

Section: Introductionmentioning

confidence: 99%

Acidic nickel salts of Keggin type heteropolyacids supported on SBA-15 mesoporous silica

et al. 2015

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A series of heteropolyacids-mesoporous silica composites were prepared from nickel salt of molybdophosphoric acid Ni 1 HPMo 12 O 40 (NiHPM) by supporting on SBA-15 mesoporous silica in different concentrations of active phase. The structure and texture of these NiHPM/ SBA-15 composites were studied by XRD, FT-IR and micro-Raman spectroscopy, nitrogen physisorption at 77 K, UV-Vis-DRS and SEM-EDX. The effect of the support on thermal stability was investigated by TG-DTG, DTA and DSC methods. By impregnation of Ni salt on mesoporous silica the thermal stability of the Keggin structure increases in comparison with its parent bulk heteropolyacid. From XRD at small angles could be observed that NiHPM/SBA-15 composites with low surface coverage preserve the mesopore structure of silica, with well dispersed NiHPM on the surface of the pore walls for SBA-15. The adsorption of ammonia and its temperature programmed desorption using thermogravimetry were studied for acidity evaluation. The total acidity of the weak and strong acidic sites of NiHPM/SBA-15 composites is obviously increases in comparison with bulk Ni salt. The main products observed in the evolved gases during desorption of NH 3 were NH 3 , CO 2 and NO/ NO 2 .

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“…The band at 890 cm −1 was assigned to the stretching vibration of W O b W, associated with corner bridged oxygens, and the band at 778 cm −1 comes from the vibration of W O c W, associated with side bridged oxygens. From the IR spectrum of HPA/TPI-SBA-15, one can see a broad band in the range of 1000-1250 cm −1 , which reveals the strong interaction of silica and heteropolyacid[16]. Actually, clear observation of POM was hindered as a result of the strong background of silica support.…”

mentioning

confidence: 88%

H5PW10V2O40/pyridino-SBA-15 as a highly recyclable, robust and efficient inorganic–organic hybrid material for the catalytic preparation of bis(indolyl)methanes

Tayebee

Amini

Nehzat

et al. 2013

Journal of Molecular Catalysis A: Chemical

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Synthesis of heteropolyacid (H3PW12O40)/SiO2 nanoparticles and their catalytic properties

Cited by 60 publications

References 40 publications

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Acidic nickel salts of Keggin type heteropolyacids supported on SBA-15 mesoporous silica

H5PW10V2O40/pyridino-SBA-15 as a highly recyclable, robust and efficient inorganic–organic hybrid material for the catalytic preparation of bis(indolyl)methanes

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