Catalytic activity of heteropoly tungstate catalysts for ethanol dehydration reaction: Deactivation and regeneration

Verdeş, Orsina; Sasca, Viorel; Popa, Alexandru; Suba, Mariana; Borcănescu, Silvana

doi:10.1016/j.cattod.2019.12.040

Cited by 18 publications

(10 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e strong spectra at 750 cm −1 were ascribed to the Ce-O bonds [29], and the spectra in the range of 500-580 cm −1 were assigned to the Co-O bonds [30]. Moreover, the absorption peak corresponding to Keggintype HPW emerged at 982 cm −1 , 889 cm −1 , and 801 cm −1 assigned to W-O, W-O b -W, and W-O c -W, respectively [31]. Notably, in the FTIR spectrum of HPW@CoCeO, characteristic HPW peaks can be also found.…”

Section: Catalyst Characterizationmentioning

confidence: 95%

Bimetallic MOF-Derived Synthesis of Cobalt-Cerium Oxide Supported Phosphotungstic Acid Composites for the Oleic Acid Esterification

Zhang

Yang

Yao

et al. 2021

Journal of Chemistry

View full text Add to dashboard Cite

The impregnation of phosphotungstic acid (HPW) with porous cobalt-cerium oxide (HPW@CoCeO) has been prepared by pyrolysis of CoCe-MOF and used for the production of methyl oleate from oleic acid and methanol. FTIR, XRD, SEM, TEM, N2 adsorption/desorption, and NH3-TPD were characterized for the prepared composites. Simultaneously, the effects of reaction time, substrate molar ratio, temperature, and catalyst loading on catalytic activity were highlighted, and the conversion of 67.2% was reached after 4 h at 60°C. Importantly, HPW@CoCeO was reusabe and reused more than eight times, and the oleic acid conversion could be maintained at 61.8% without significant activity loss. Thus, the HPW@CoCeO composite could be used as acid catalysts for sustainable energy production.

show abstract

Section: Catalyst Characterizationmentioning

confidence: 95%

Bimetallic MOF-Derived Synthesis of Cobalt-Cerium Oxide Supported Phosphotungstic Acid Composites for the Oleic Acid Esterification

Zhang

Yang

Yao

et al. 2021

Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…Similar results were also found in previous reports. 32,40,41 The XRD patterns of the pure HPW and M x H 3Àx PW catalysts are shown in Fig. 1.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

“…28,29 Particularly, when different metal ions (K + , Rb + , Cs + , Ag + and Sn 2+ ) are introduced into HPAs, it not only improves the surface area of HPAs and enhances insolubility in the polar solvents, but also changes the acid densities and strengths of HPAs. [30][31][32] Meanwhile, the thermal stability of HPAs can also be improved. 31,33 Various metal doped HPAs and heteropolyacid salts, have been applied in many reactions, including dehydration, 31,32,34 esteri-cation, 35,36 transesterication, 37,38 etc.…”

Section: Introductionmentioning

confidence: 99%

“…[30][31][32] Meanwhile, the thermal stability of HPAs can also be improved. 31,33 Various metal doped HPAs and heteropolyacid salts, have been applied in many reactions, including dehydration, 31,32,34 esteri-cation, 35,36 transesterication, 37,38 etc. However, until now, heteropolyacid salts have not been employed as catalysts for the conversion of DMF and ethylene to PX.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient and sustainable production ofp-xylene from biomass-derived 2,5-dimethylfuran and ethylene using alkali metal doped phosphotungstic acid catalysts

Zhao

et al. 2022

Sustainable Energy Fuels

View full text Add to dashboard Cite

show abstract

“…An interesting result is the inflection point before 350 min, when conversion in the presence of βAgPW-WI remains constant and stable, while one recorded for βAgPW-IE descends below βAgPW-WI, even though it was slightly higher at the beginning of the reaction (98%). A possible reason for the ethanol conversion decreases with time on stream is the cokes formation which leads to blocking the acidic centers responsible for ethylene formation (Popa et al 2018;Verdes et al 2019). Introduction of Ag leads to…”

Section: Catalytic Studymentioning

confidence: 99%

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

et al. 2021

Self Cite

View full text Add to dashboard Cite

Heteropolyacids and their salts comprise catalytic centers for the production of ethylene, one of the most important constituents in the chemical industry. The paper emphasizes different synthesis routes of hybrid materials consisting of dodecatungstophosphoric acid silver salt (AgPW) and β zeolite-stepwise wet impregnation, silver-exchange in β zeolite, and dry mixing of precursors. Composite preparation procedures induced minor effects on the weak acid sites, while strong acid sites were increased significantly. β/AgPW composites prepared by two-steps wet impregnation and ion-exchange procedures have strong acid sites content and total acidity higher in comparison to the pure AgPW salt and β zeolite. This is a result of precursors synergetic effect-cumulative strong acidic sites are generated in the presence of well-dispersed Keggin ions on the zeolite network. Composite samples with a higher content of strong acid centers exhibit higher conversion in the ethanol dehydration reaction, i.e., the ion-exchanged βAgPW sample has attained a conversion over 81%, while the wet-impregnated sample has a significant 86%. The distribution and presence of AgPW active phase are found to be crucial for both stable conversion and high selectivity results in ethylene production from ethanol, which is regarded as one of the most significant processes in environmental and sustainable industrial chemistry.

show abstract

Catalytic activity of heteropoly tungstate catalysts for ethanol dehydration reaction: Deactivation and regeneration

Cited by 18 publications

References 32 publications

Bimetallic MOF-Derived Synthesis of Cobalt-Cerium Oxide Supported Phosphotungstic Acid Composites for the Oleic Acid Esterification

Bimetallic MOF-Derived Synthesis of Cobalt-Cerium Oxide Supported Phosphotungstic Acid Composites for the Oleic Acid Esterification

Efficient and sustainable production ofp-xylene from biomass-derived 2,5-dimethylfuran and ethylene using alkali metal doped phosphotungstic acid catalysts

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

Contact Info

Product

Resources

About