oxidation | An-Najah Staff

On the Adsorption of Aromatics on Oxygenated Activated Carbon in Nonaqueous Adsorption Media

Tue, 2015-03-24 15:06 — Hassan Arafat

Journal Title, Volume, Page:

Separation Science and Technology, Volume 39, Issue 1 , pages 43 - 62

Year of Publication:

2005

Authors:

Hassan A. Arafat

Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois, USA

Current Affiliation:

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

Falk Ahnert

Delft University of Technology, Delft, The Netherlands

Neville G. Pinto

Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio, USA

Preferred Abstract (Original):

In a previous study, H-bonding was postulated as a mechanism of adsorption for aromatics on oxygen-containing activated carbon. To verify this, the adsorption of phenol, aniline, benzene, and nitrobenzene was studied as a function of surface oxygen groups. It was determined that there is a linear correlation between total surface acidity and adsorption capacity for H-bonding adsorbates in cyclohexane. Flow microcalorimetry (FMC) and ultrasonic desorption tests also indicate stronger and less reversible adsorption bonds for H-bonding adsorbates. Reversibility

Oxidation of some Alicyclic Amines by Potassium Hexacyanoferrate (III) in Alkaline Medium: A Kinetic and Mechanistic Study

Sun, 2014-12-28 11:07 — Mohammed Al-Subu'

Journal Title, Volume, Page:

An-Najah University Journal for Research - Natural Sciences - Volume 15, Issue 1, 2001

Year of Publication:

2001

Link:

http://scholar.najah.edu/publication/journal-article/oxidation-some-alicyclic-am...

Authors:

M. M. Al-Subu

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

A. A. Amer

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

W. J. Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

M. Hanoun

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus, Palestine

M.J. Musmar

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

Oxidation of some alicyclic amines (morpholine, piperazine and piperidine) by potassium hexacyanoferrate(III) in basic medium has been investigated at 35°C. Stoichiometric results showed that four moles of hexacyanoferrate(III) were consumed per mole of piperidine or morpholine whereas piperazine consumed eight moles of the oxidant to produce the corresponding lactams. Kinetic studies indicated that piperidine and morpholine also followed different kinetics from that of piperazine, being first order in the amine concentration and independent of the concentrations of hexacyanoferrate(???) and hydroxide ion, while in the case of piperazine, the reaction was first order in both oxidant and substrate concentrations and zero order with respect to the concentration of hydroxide ion. The changes in reaction rate due to changing ionic strength of the medium as well as other factors has also been investigated. The activation parameters of the oxidation process have been evaluated and a mechanism consistent with the observed kinetics has been proposed. Keywords: Hexacyanoferrate(III), morpholine, piperazine, piperidine, oxidation, lactam.

Kinetics of Oxidation of Some Fluoroquinolones by Hexacyanoferrate (III) in Alkaline Medium

Wed, 2014-10-15 11:36 — Mohammed Al-Subu'

Journal Title, Volume, Page:

International Journal of Chemistry 12/2013; 34(2):1388

Year of Publication:

2013

Authors:

Nizam Diab

Arab American University – Jenin; P.O. Box: 240 Jenin, Palestine

Ibrahim Abu-Shqair

An-najah National University; P.O. Box: 7 Nablus, Palestine

Mohammad Al-Subu

An-najah National University; P.O. Box: 7 Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Radi Salim

An-Najah National University; P.O. Box: 7 Nablus, Palestine

Preferred Abstract (Original):

Kinetics of osmium tetroxide catalyzed-oxidation of the studied fluoroquinolones by potassium hexacyanoferrate(III) in alkaline medium were studied. The rate was found to be independent on the concentration of hexacyanoferrate(III), and first order with respect to both fluoroquinolone and OsO4. An empirical rate law was derived for the reaction, and the effect of various variables on the rate of reaction was studied. Thermodynamic parameters (Ea, ΔH*, ΔS*, ΔG*) were also calculated.

Comparative Oxidation of Adsorbed Asphaltenes onto Transition Metal Oxide Nanoparticles

Mon, 2014-05-19 12:46 — Nashaat N. Nassar

Journal Title, Volume, Page:

Colloids and Surfaces A: Physicochemical and Engineering Aspects Volume 384, Issues 1–3, Pages 145–149

Year of Publication:

2011

Link:

http://www.sciencedirect.com/science/article/pii/S0927775711002238

Authors:

Nashaat N. Nassar

Alberta Ingenuity Centre for In-Situ Energy, Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada

Current Affiliation:

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

Azfar Hassan

Alberta Ingenuity Centre for In-Situ Energy, Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada

Pedro Pereira-Almao

Alberta Ingenuity Centre for In-Situ Energy, Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada

Preferred Abstract (Original):

In this study asphaltenes – waste hydrocarbons and problematic constituent present in heavy oil – have been investigated for its oxidation onto different types of nanoparticles, namely NiO, Co₃O₄ and Fe₃O₄. All nanoparticles tested showed high adsorption affinity and catalytic activity for asphaltene adsorption and oxidation in the following order NiO > Co₃O₄ > Fe₃O₄. The oxidation temperature of asphaltenes decreased by 140, 136 and 100 °C with respect to non-catalytic oxidation in the presence of NiO, Co₃O₄, and Fe₃O₄nanoparticles, respectively. A correlation appears to exist between the adsorption affinity and the catalytic activity, the higher the affinity the greater the catalytic activity.

Effect of Surface Acidity and Basicity of Aluminas on ‎Asphaltene Adsorption and Oxidation

Mon, 2014-05-19 11:55 — Nashaat N. Nassar

Journal Title, Volume, Page:

J Colloid Interface Sci., 360(1):233-8

Year of Publication:

2011

Link:

http://www.sciencedirect.com/science/article/pii/S0021979711004863

Authors:

Nashaat N. Nassar

Department of Chemical & Petroleum Engineering, Alberta Ingenuity Centre for In-Situ Energy, University of Calgary, Calgary, Alberta, Canada

Current Affiliation:

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

Azfar Hassan

Department of Chemical & Petroleum Engineering, Alberta Ingenuity Centre for In-Situ Energy, University of Calgary, Calgary, Alberta, Canada

Pedro Pereira-Almao

Department of Chemical & Petroleum Engineering, Alberta Ingenuity Centre for In-Situ Energy, University of Calgary, Calgary, Alberta, Canada

Preferred Abstract (Original):

This study investigates the effect of surface acidity and basicity of aluminas on asphaltene adsorption followed by air oxidation. Equilibrium batch adsorption experiments were conducted at 25 °C with solutions of asphaltenes in toluene at concentrations ranging from 100 to 3000 g/L using three conventional alumina adsorbents with different surface acidity. Data were found to better fit to the Freundlich isotherm model showing a multilayer adsorption. Results showed that asphaltene adsorption is strongly affected by the surface acidity, and the adsorption capacities of asphaltenes onto the three aluminas followed the order acidic > basic and neutral. Asphaltenes adsorbed over aluminas were subjected to oxidation in air up to 600 °C in a thermogravimetric analyzer to study the catalytic effect of aluminas with different surface acidity. A correlation was found between Freundlich affinity constant (1/n) and the catalytic activity. Basic alumina that has the lowest 1/n value, depicting strongest interactions, has the highest catalytic activity, followed by neutral and acidic aluminas, respectively.

Iron Oxide Nanoparticles for Rapid Adsorption and ‎Enhanced Catalytic Oxidation of Thermally Cracked ‎Asphaltenes

Thu, 2014-05-15 14:07 — Nashaat N. Nassar

Journal Title, Volume, Page:

Fuel Volume 95, Pages 257–262

Year of Publication:

2012

Link:

http://www.sciencedirect.com/science/article/pii/S0016236111005722

Authors:

Nashaat N. Nassar

Department of Chemical & Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada T2N 1N4

Current Affiliation:

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

Azfar Hassan

Department of Chemical & Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada T2N 1N4

Francisco Lopez-Linares

Department of Chemical & Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada T2N 1N4

Pedro Pereira-Almao

Department of Chemical & Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada T2N 1N4

Preferred Abstract (Original):

Thermally cracked asphaltenes from Athabasca vacuum residue produced at four different process severities were investigated for adsorption and subsequent catalytic oxidation. Fe₃O₄ nanoparticles were used for the removal of these four different thermally cracked asphaltenes from toluene solutions by a batch-adsorption technique followed by subsequent catalytic oxidation. Asphaltene adsorption kinetics and isotherms are presented. Further, the catalytic effect of nanoparticles on asphaltene oxidation has been addressed. Adsorption was rapid as equilibrium was achieved within 10 min. The equilibrium adsorption data fit well to the Langmuir model. It was found that the adsorption rate, affinity and capacity depend on the molecular weight (MW) of the asphaltenes. Adsorption rate and capacity were highest for the lower MW molecules while adsorption affinity was strongest for the larger MW molecules. In addition, in the absence of nanoparticles, the four thermally cracked asphaltenes oxidized differently. However, when adsorbed onto Fe₃O₄ nanoparticles their oxidation behavior became similar, showing the enhanced catalytic effect of nanoparticles.

Osmium(VIII)-Catalyzed Oxidation of Some Cyclic Amines by Potassium Hexacyanoferrate(III) in Alkaline Media: a Kinetics and Mechanistic Study

Wed, 2014-04-02 12:27 — Dr. Waheed J. Jondi

Journal Title, Volume, Page:

Chemistry of Heterocyclic Compounds, Volume 39, Issue 4, pp 478-484

Year of Publication:

2003

Link:

http://link.springer.com/article/10.1023%2FA%3A1024765330259

Authors:

W. J. Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

A. A. Amer

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

M. M. Al-Subu

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

M. Hannoun

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

M. J. Musmar

College of Pharmacy, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

Reactions of morpholine, piperidine, and piperazine with Os(VIII)-catalyzed hexacyanoferrate(III) in alkaline media to produce the corresponding lactam have been studied at constant temperature and ionic strength. The reactions followed first-order kinetics with respect to [amine] and [Os(VIII)] but were independent of [Fe(CN)6 3-] and [OH-]. The effects of introduced electrolytes, potassium hexacyanoferrate(II), relative permitivity, and temperature have also been studied. A mechanism accounting for these results has been proposed.

Oxidation of some Alicyclic Amines by Potassium Hexacyanoferrate (III) in Alkaline Medium: A Kinetic and Mechanistic Study

Wed, 2014-04-02 12:22 — Dr. Waheed J. Jondi

Journal Title, Volume, Page:

An-Najah University Journal for Research - Natural Sciences - Volume 15, Issue 1

Year of Publication:

2001

Link:

http://scholar.najah.edu/publication/journal-article/oxidation-some-alicyclic-am...

Authors:

W. J. Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

M. M. Al-Subu

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

A. A. Amer

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

M. Hanoun

College of Pharmacy, An-Najah National University, Nablus, Palestine

M. J. Mus

College of Pharmacy, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

Oxidation of some alicyclic amines (morpholine, piperazine and piperidine) by potassium hexacyanoferrate(III) in basic medium has been investigated at 35°C. Stoichiometric results showed that four moles of hexacyanoferrate(III) were consumed per mole of piperidine or morpholine whereas piperazine consumed eight moles of the oxidant to produce the corresponding lactams. Kinetic studies indicated that piperidine and morpholine also followed different kinetics from that of piperazine, being first order in the amine concentration and independent of the concentrations of hexacyanoferrate(III) and hydroxide ion, while in the case of piperazine, the reaction was first order in both oxidant and substrate concentrations and zero order with respect to the concentration of hydroxide ion. The changes in reaction rate due to changing ionic strength of the medium as well as other factors has also been investigated. The activation parameters of the oxidation process have been evaluated and a mechanism consistent with the observed kinetics has been proposed.

The Catalytic Activity of Poly(Siloxane)- Supported ‎Metalloporphyrins in Olefin Oxidation Reactions: The ‎Effect of the Support on the Catalytic Activity and ‎Selectivity

Wed, 2014-04-02 08:52 — Dr. Waheed J. Jondi

Journal Title, Volume, Page:

Journal of Molecular Catalysis A: Chemical Volume 113, Issues 1–2, Pages 35–44

Year of Publication:

1996

Link:

http://www.sciencedirect.com/science/article/pii/S1381116996000556

Authors:

Waheed Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Hikmat S. Hilal

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Shukri Khalaf

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Afaq Keilani

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammad Suleiman

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammad Suleiman

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

A.F. Schreiner

Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA

Preferred Abstract (Original):

Supported tetra(-4-pyridyl)porphyrinato-manganese(III) [Mn^III(TPyP)]⁺ and -tin(IV) [Sn^IV(TPyP)]²⁺ have been prepared. The solid support was iodonated poly(siloxane) surface prepared by condensation reactions of (EtO)₄Si with (MeO)₃Si(CH₂)₃I. The supported metalloporphyrins were employed as catalysts for the oxidation reactions of 1-octene and of cyclohexene. NaBH₄ was used to reduce [Mn^III(TPyP)]⁺ and [Sn^IV(TPyP)]²⁺ back to their catalytically active Mn^II and Sn^II forms, respectively. Contrary to their homogeneous counterparts, both of the supported metalloporphyrins catalysed the cyclohexene oxidation reaction to yield only 2-cyclohexen-1-one with no other products over a reaction time of 10 h. In addition to cyclohexene oxidation, the supported [Mn^III(TPyP)]⁺ catalysed 1-octene oxidation as well, whereas the supported [Sn^IV(TPyP)]²⁺ was inactive for the oxidation of 1-octene.

see te full file here

Kinetics of Oxidation of Some Fluoroquinolones by Hexacyanoferrate (III) in Alkaline Medium

Thu, 2014-03-27 12:25 — Ibrahim Diab Abu-Shqair

Journal Title, Volume, Page:

International Journal of Chemistry, Vol.34, Issue.2 1388

Year of Publication:

2013

Authors:

Nizam Diab

Arab American University – Jenin; P.O. Box: 240 Jenin, Palestine

Current Affiliation:

Arab American University – Jenin

[email protected]

Ibrahim Abu-Shqair

An-najah National University; P.O. Box: 7 Nablus, Palestine

Current Affiliation:

Chemistry Department, An-najah National University

[email protected]

Mohammad Al-Subu

An-najah National University; P.O. Box: 7 Nablus, Palestine

Current Affiliation:

Chemistry Department, An-najah National University

[email protected]

Radi Salim

An-najah National University; P.O. Box: 7 Nablus, Palestine

Current Affiliation:

Chemistry Department, An-najah National University

[email protected]

Preferred Abstract (Original):

Kinetics of osmium tetroxide catalyzed-oxidation of the studied fluoroquinolones by potassium hexacyanoferrate(III) in alkaline medium were studied. The rate was found to be independent on the concentration of hexacyanoferrate(III), and first order with respect to both fluoroquinolone and OsO4. An empirical rate law was derived for the reaction, and the effect of various variables on the rate of reaction was studied. Thermodynamic parameters (Ea, ΔH*, ΔS*, ΔG*) were also calculated.