Nature and mode of addition of phosphate precursor in the synthesis of aluminum phosphate and its influence on methanol dehydration to dimethyl ether

Kumar, V. Pavan; Padmasri, A.H.; Satyanarayana, C.V.V.; Reddy, I. A. K.; Raju, B. David; Rao, K. Seshagiri

doi:10.1016/j.catcom.2006.02.025

Cited by 57 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of the global climate changes caused by the consumption of conventional fossil fuels, many countries have given an effort on the development of new clean fuels. The synthesis of dimethyl ether (DME) from synthesis gas has received much attention, because it is an important chemical and a chemical intermediate for the production of gasoline, ethylene, aromatics, and other chemicals. − Moreover, DME can be used as a clean alternative fuel for diesel engines, because of its desirable properties, such as high cetane number, thermal efficiency, and so on. , So far, there are two approaches for DME production from synthesis gas. One is a two-step method that includes the synthesis of methanol and then its dehydration.…”

Section: Introductionmentioning

confidence: 99%

Influence of Structure Type of Al₂O₃ on Dehydration of Methanol for Dimethyl Ether Synthesis

Seo

Jung

Lee

et al. 2008

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

This study focused on the effect of alumina properties on the catalytic performance in the dehydration of methanol to synthesize dimethyl ether. The catalysts (γ-Al 2 O 3 and η-Al 2 O 3 ) were prepared from boehmite and bayerite, respectively, via calcination at various temperatures. With heat treatment, the properties of alumina have been changed significantly. Under identical reaction conditions, γ-Al 2 O 3 calcined at 500°C and η-Al 2 O 3 calcined at 600°C showed the highest catalytic activity, because of high acid site density among the same types of alumina. Interestingly, η-Al 2 O 3 showed higher catalytic activity than γ-Al 2 O 3 , although both catalysts possess comparable acidic properties. This means the structure type of alumina is crucial to determine catalytic performance in this reaction.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of Structure Type of Al₂O₃ on Dehydration of Methanol for Dimethyl Ether Synthesis

Seo

Jung

Lee

et al. 2008

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Moreover, there exists a stoichiometric mineral known as Al 0.5 Fe 0.5 PO 4 • nH 2 O, in which both cations are in a 1:1 proportion. 11 The Fe-and Al-phosphate solid solution is of interest because the varying composition of metal cations can change their useful properties such as a catalyst for organic syntheses 11,12 and electrochemical cells for lithium batteries. 6,7 The miscibility in the Fe-and AlPO 4 system as well as the dehydration behavior of both FePO 4 • 2H 2 O and AlPO 4 • 2H 2 O has been the subject of intense scientific research.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, there exists a stoichiometric mineral known as Al 0.5 Fe 0.5 PO 4 · n H 2 O, in which both cations are in a 1:1 proportion . The Fe- and Al-phosphate solid solution is of interest because the varying composition of metal cations can change their useful properties such as a catalyst for organic syntheses , and electrochemical cells for lithium batteries. , …”

Section: Introductionmentioning

confidence: 99%

Dehydration Behavior of Synthetic Al_0.5Fe_0.5PO₄·2.5H₂O

Boonchom

Vittayakorn

2010

J. Chem. Eng. Data

View full text Add to dashboard Cite

The dehydration behavior of the experimentally produced Al 0.5 Fe 0.5 PO 4 • 2.5H 2 O solid solution is assessed from thermogravimetrical (TG, differential thermogravimetric, DTG, and differential thermal analysis, DTA) and differential scanning calorimetry (DSC) analyses. The dehydration proceeded through a well-defined step at low temperatures (< 300 °C), which corresponds to the loss of 2.5 water molecules. The fluctuating dependence of the activation energies on fraction mass loss (R) for the dehydration reaction of Al 0.5 Fe 0.5 PO 4 • 2.5H 2 O calculated through isoconversional methods (Ozawa and the Kissinger-Akahira-Sunose) indicates the existence of a complex multistep mechanism. The Avrami exponent value of 1.11 is indicative of one-dimensional growth as a phase boundary mechanism. The thermodynamic functions (∆H*, ∆G*, and ∆S*) of the dehydration reaction calculated from the DSC technique are discussed for the first time.

show abstract

“…Up to date, solid acid catalysts have been studied to develop a desirable process for methanol dehydration. [2][3][4][5][6][7][8][9][10][11][12] Among the catalysts, alumina has been considered a good candidate in this reaction. It have been known that the moderate acid site strength of alumina could enhance the formation of DME from methanol.…”

Section: Introductionmentioning

confidence: 99%

“…DME is well known as a useful chemical intermediate for the production of gasoline, ethylene and aromatics. [1][2][3][4][5] Especially DME could be utilized as a clean alternative fuel for diesel engine automobiles because of its desirable properties, such as high cetane number, thermal efficiency, and so on. 6,7 So far, DME has been produced from synthesis gas by two mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ionic Liquid as a Template on Preparation of Porous η-Al₂O₃to DME Synthesis from Methanol

Yoo

Lee²

2010

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

Porous η-Al2O3 was synthesized by modified sol-gel method using ionic liquid as a templating material. The addition of ionic liquid assisted to increase the surface area of alumina. However, the acidity of aluminas prepared with ionic liquids was hardly affected regardless the change of its structural properties. Among the ionic liquids used in this study, 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) was the most effective ionic liquid to produce porous η-Al2O3 particles. The catalytic performance of these aluminas has been investigated in dehydration of methanol to produce dimethyl ether. The alumina prepared with [Bmim][PF6] outperformed the other aluminas except η-Al2O3 without modification in this reaction.

show abstract

Nature and mode of addition of phosphate precursor in the synthesis of aluminum phosphate and its influence on methanol dehydration to dimethyl ether

Cited by 57 publications

References 18 publications

Influence of Structure Type of Al₂O₃ on Dehydration of Methanol for Dimethyl Ether Synthesis

Influence of Structure Type of Al₂O₃ on Dehydration of Methanol for Dimethyl Ether Synthesis

Dehydration Behavior of Synthetic Al_0.5Fe_0.5PO₄·2.5H₂O

Influence of Ionic Liquid as a Template on Preparation of Porous η-Al₂O₃to DME Synthesis from Methanol

Contact Info

Product

Resources

About

Nature and mode of addition of phosphate precursor in the synthesis of aluminum phosphate and its influence on methanol dehydration to dimethyl ether

Cited by 57 publications

References 18 publications

Influence of Structure Type of Al2O3 on Dehydration of Methanol for Dimethyl Ether Synthesis

Influence of Structure Type of Al2O3 on Dehydration of Methanol for Dimethyl Ether Synthesis

Dehydration Behavior of Synthetic Al0.5Fe0.5PO4·2.5H2O

Influence of Ionic Liquid as a Template on Preparation of Porous η-Al2O3to DME Synthesis from Methanol

Contact Info

Product

Resources

About

Influence of Structure Type of Al₂O₃ on Dehydration of Methanol for Dimethyl Ether Synthesis

Influence of Structure Type of Al₂O₃ on Dehydration of Methanol for Dimethyl Ether Synthesis

Dehydration Behavior of Synthetic Al_0.5Fe_0.5PO₄·2.5H₂O

Influence of Ionic Liquid as a Template on Preparation of Porous η-Al₂O₃to DME Synthesis from Methanol