Supported H3PW12O40 for 2-propanol (photo-assisted) catalytic dehydration in gas-solid regime: The role of the support and of the pseudo-liquid phase in the (photo)activity

García‐López, Elisa I.; Marcı̀, Giuseppe; Pomilla, Francesca Rita; Kirpsza, A.; Micek‐Ilnicka, A.; Palmisano, Leonardo

doi:10.1016/j.apcatb.2016.02.063

Cited by 32 publications

(46 citation statements)

References 32 publications

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“…The specific surface area ( S BET ) of HPW anchored samples with respect to bare Meso‐HZ‐5 support was observed to be decreased with increase in HPW loading. This finding is speculated to the fact that, some pores of the Meso‐HZ‐5 support were blocked by the heteropolyacid clusters .…”

Section: Resultsmentioning

confidence: 96%

HPW anchored Meso‐HZ‐5, a novel catalyst for selective synthesis of ethyl levulinate biofuel by alcoholysis of biomass‐derived furfuryl alcohol

Nandiwale

Pande

Bokade

2017

Env Prog and Sustain Energy

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Ethanolysis of biomass derived furfuryl alcohol (FA) produces ethyl levulinate (EL), a biofuel additive and precursor for γ‐valerolactone synthesis. The present study is devoted to develop an efficient and an environmentally benign catalytic system for one‐pot conversion of FA to EL biofuel, by revealing an insight of the catalytic mechanism. The catalytic activity of H‐ZSM‐5, Meso‐HZ‐5 (desilicated H‐ZSM‐5) and different percentage H3PW12O40(HPW) anchored to Meso‐HZ‐5 catalysts have been evaluated for the FA ethanolysis. As per our knowledge, this is the first research reporting the application of HPW anchored to Meso‐HZ‐5 catalysts for the conversion of FA into EL in biomass utilization. These catalysts were synthesized and characterized by Powder X‐ray diffraction (XRD), N2 physisorption and temperature programmed NH3 desorption (TPAD). Products of FA ethanolysis viz., 4,5,5‐triethoxypentan‐2‐one (TEP), ethoxy‐methyl‐ furan (EMF), diethyl ether (DEE), EL were identified by Gas Chromatography‐Mass Spectroscopy (GC‐MS) and quantified by flame ionization detector (GC‐FID). The physicochemical properties of catalysts were found to correlate to the product distribution matrix. Moreover, influences of several process parameters such as catalyst amount, reactant molar ratio, temperature and time on the extent of FA ethanolysis were systematically investigated. Under optimized conditions, 15% (w/w) HPW/Meso‐HZ‐5 exhibited a remarkable catalytic performance with complete FA conversion (100%) along with 97% yield of EL, these activity values are superior than the previously reported studies. The present study provides an insight of the catalytic mechanism along with a potential environmental benign and the economic catalyst for the efficient synthesis of EL biofuel from the biomass‐derived FA. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1736–1742, 2018

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Section: Resultsmentioning

confidence: 96%

HPW anchored Meso‐HZ‐5, a novel catalyst for selective synthesis of ethyl levulinate biofuel by alcoholysis of biomass‐derived furfuryl alcohol

Nandiwale

Pande

Bokade

2017

Env Prog and Sustain Energy

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“…To analyze the structure of the POM‐based composite, FTIR spectroscopy is also a suitable method. For SiW 12 , peaks at 766, 918, and 975 cm −1 can be ascribed W‐O c ‐W, W‐O b ‐W, and W−O d stretching, respectively (Figure S3a in the Supporting Information) . For PANI/EGC , the C=C stretching bands of quinonoid and benzenoid rings appear at 1561 and 1455 cm −1 , and the C−N stretching bands are located at 1301 and 1219 cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…For SiW 12 ,p eaks at 766, 918, and 975 cm À1 can be ascribed W-O c -W,W -O b -W,a nd WÀO d stretching, respectively ( Figure S3a in the Supporting Information). [66] For PANI/EGC,t he C=Cs tretching bands of quinonoid and benzenoid rings appear at 1561 and 1455 cm À1 , and the CÀNs tretching bands are located at 1301 and 1219 cm À1 ,r espectively.I nq uinonoidr ings, the characteristic NÀQs tretching band emerges at 1119cm À1 ( Figure S3b in the Supporting Information). [67] For SiW 12 @PANI/EGC(B),t he above peaks are retained, but their positions change slightly (Figure 3f).…”

Section: Structural Characterization Of Egcmentioning

confidence: 96%

A Polyoxometalate‐Based Binder‐Free Capacitive Deionization Electrode for Highly Efficient Sea Water Desalination

Liu

Zhang

et al. 2020

Chemistry A European J

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Capacitive deionization is a promising technique in sea water desalination. Compared with common electrodes, mixed capacitive‐deionization electrodes exhibit better performance in sea water desalination because they integrate pseudocapacitance and electric double‐layer capacitance in one system. Herein, a 3D binder‐free mixed capacitive‐deionization electrode was fabricated by direct electrodeposition of SiW12O404− and polyaniline on a 3D exfoliated graphite carrier. In this electrode, SiW12O404−/polyaniline composite particles with a size of about 100–120 nm are dispersed homogenously on the 3D exfoliated graphite carrier. Its specific capacitance reaches 352 F g−1 at 1 A g−1. With increasing current from 1 to 20 A g−1, the specific capacitance only decays by 32 %. When employed in sea water desalination, the performance of this mixed capacitive‐deionization electrode is also excellent. At 1.2 V, the salt adsorption capacity of this mixed electrode reaches 23.1 mg g−1 with a salt adsorption rate of 1.38 mg g−1 min−1 in 500 mg L−1 NaCl. The performance of this electrode is well retained after 30 cycles. The excellent sea water desalination performance originates from the synergistic effect between SiW12O404− and polyaniline. This work has developed polyoxometalate as a new material for capacitive‐deionization electrodes.

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“…The catalytic behaviour of PW 12 depends strongly on the modifications of the secondary structure and, in particular, on its Brönsted acidity, which is influenced by water. The hydration state of the secondary structure determines not only the accessibility of the reacting molecules but also the number and the strength of the surface acid sites, that is, the H 5 O 2 + species , …”

Section: Resultsmentioning

confidence: 99%

“…The dehydration of 2‐propanol is used frequently to investigate the acidic character of catalysts such as supported heteropolyacids . In previous work, some of us studied the role of the HPA support in the (photo)catalytic dehydration of 2‐propanol to propene and concluded that the type of support (semiconductor or insulator) affected the reactivity of the composite material. Furthermore, for the hydration of propene in both catalytic and photocatalytic systems, various insulator and semiconductor oxides have been used as supports of HPA, and these oxides play the role of the semiconductor in the reaction mechanism when irradiated by light with appropriate wavelengths; however, experimental evidence through electron paramagnetic resonance (EPR) spectroscopy of the electron transfer to the HPA species has not been presented , .…”

Section: Introductionmentioning

confidence: 99%

Improved (Photo)catalytic Propene Hydration in a Gas/Solid System by Using Heteropolyacid/Oxide Composites: Electron Paramagnetic Resonance, Acidity, and Role of Water

et al. 2017

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Binary materials composed of the oxides SiO 2 , TiO 2 and N-doped TiO 2 and the Keggin heteropolyacid (PW 12 ) were prepared and physicochemically characterized. They were used as catalysts and photocatalysts for the hydration of propene to 2-propanol. The characterization of the samples, particularly the electron paramagnetic resonance (EPR) spectroscopy results and the acidity properties, were useful to explain the key role played by the PW 12 in the composite materials in the thermal and photoassisted catalytic processes. The simultaneous pres-Eur.

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Supported H3PW12O40 for 2-propanol (photo-assisted) catalytic dehydration in gas-solid regime: The role of the support and of the pseudo-liquid phase in the (photo)activity

Cited by 32 publications

References 32 publications

HPW anchored Meso‐HZ‐5, a novel catalyst for selective synthesis of ethyl levulinate biofuel by alcoholysis of biomass‐derived furfuryl alcohol

HPW anchored Meso‐HZ‐5, a novel catalyst for selective synthesis of ethyl levulinate biofuel by alcoholysis of biomass‐derived furfuryl alcohol

A Polyoxometalate‐Based Binder‐Free Capacitive Deionization Electrode for Highly Efficient Sea Water Desalination

Improved (Photo)catalytic Propene Hydration in a Gas/Solid System by Using Heteropolyacid/Oxide Composites: Electron Paramagnetic Resonance, Acidity, and Role of Water

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