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    Thermogravimetric and Kinetic Analyses of Oil Palm Empty Fruit Bunch (OPEFB) Pellets Using the Distributed Activation Energy Model

    Nyakuma, Bemgba, Ahmad, Arshad, Johari, Anwar, Abdullah, Tuan
    Journal of Physical Science, 2016, Vol.27(3), pp.67-83 [Peer Reviewed Journal]
    © ProQuest LLC All rights reserved, Engineered Materials Abstracts, Solid State and Superconductivity Abstracts, METADEX, Materials Science Database, Advanced Technologies & Aerospace Database, Engineering Database, East & South Asia Database, Publicly Available Content Database, Advanced Technologies Database with Aerospace, Materials Research Database, Technology Research Database, ProQuest Engineering Collection, ProQuest Advanced Technologies & Aerospace Collection, ProQuest Materials Science Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest Central China, ProQuest One Academic, Advanced Technologies & Aerospace Index (ProQuest), Materials Science Index (ProQuest), Materials Science Collection (ProQuest), Engineering Collection (ProQuest)
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    Title: Thermogravimetric and Kinetic Analyses of Oil Palm Empty Fruit Bunch (OPEFB) Pellets Using the Distributed Activation Energy Model
    Author: Nyakuma, Bemgba; Ahmad, Arshad; Johari, Anwar; Abdullah, Tuan
    Subject: Pyrolysis ; Reaction Kinetics ; Fruits ; Activation Energy ; Thermal Degradation ; Palm ; Decomposition ; Pellets ; Miscellaneous Sciences (So) ; General and Nonclassified (MD) ; General and Nonclassified (Ep) ; General and Nonclassified (Ed) ; General and Nonclassified (EC) ; Thermogravimetry ; Oil Palm ; Empty Fruit Bunches ; Pellets ; Energy Model;
    Description: The thermal degradation behaviour and decomposition kinetics of oil palm empty fruit bunch (OPEFB) pellets were investigated using a thermogravimetric analyser and the distributed activation energy model (DAEM). The OPEFB pellets were heated from 30°C to 1000°C at three different heating rates (5, 10, 20°C min^sup -1^) under a nitrogen atmosphere. The thermogravimetric-derivative thermogravimetric (TG-DTG) curves revealed that the non-isothermal decomposition of OPEFB pellets occurred in the following three stages: drying (35°C-175°C), active pyrolysis (200°C-370°C) and passive pyrolysis (370°C-1000°C), which resulted in the loss of moisture, volatile matter and char, respectively. The distributed activation energy model was subsequently used to determine the apparent activation energies (E) and pre-exponential factors (A), which ranged from 37.89 kJ mol^sup -1^ to 234.05 kJ mol^sup -1^ and from 2.05 × 10^sup 2^ min^sup -1^ to 3.54 × 10^sup 18^ min^sup -1^, respectively, for conversions...
    Is part of: Journal of Physical Science, 2016, Vol.27(3), pp.67-83
    Identifier: 16753402 (ISSN); 21804230 (E-ISSN); 10.21315/jps2016.27.3.5 (DOI)

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    Kinetic behaviour of graft copolymerisation of nitrogenous heterocyclic monomer onto EB-irradiated ETFE films

    Sithambaranathan, Paveswari, Nasef, Mohamed, Ahmad, Arshad
    Journal of Radioanalytical and Nuclear Chemistry, 2015, Vol.304(3), pp.1225-1234 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Kinetic behaviour of graft copolymerisation of nitrogenous heterocyclic monomer onto EB-irradiated ETFE films
    Author: Sithambaranathan, Paveswari; Nasef, Mohamed; Ahmad, Arshad
    Subject: Kinetic investigation ; Radiation induced graft copolymerisation ; 4-Vinyl pyridine ; ETFE film
    Description: Kinetic behaviour of graft copolymerisation of a nitrogenous heterocyclic monomer, 4-vinylpyridine (4-VP), onto electron beam irradiated poly(ethylene-co-tetrafluoroethylene) (ETFE) films was investigated in correlation with reaction parameters (absorbed dose, monomer concentration and reaction temperature). This was established by determination of initial polymerisation rate ( r p0 ), characteristic radical recombination rate (γ) and delay time ( t 0 ). The orders of the dependence of the initial rate of grafting on the absorbed dose and monomer concentration were found to be 2.28 and 3.49, respectively. The effect of temperature was investigated in the range of 50–70 °C and the activation energy was determined. The incorporation of poly(4-VP) grafts and the accompanied chemical changes in the grafted ETFE films were monitored using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, respectively. The results of the present study showed that a quantitative kinetic description for grafting of 4-VP onto ETFE can be established and the degree of grafting can be tuned by controlling the reaction parameters.
    Is part of: Journal of Radioanalytical and Nuclear Chemistry, 2015, Vol.304(3), pp.1225-1234
    Identifier: 0236-5731 (ISSN); 1588-2780 (E-ISSN); 10.1007/s10967-015-3927-6 (DOI)

    • Several versions

    Vapor-liquid equilibrium of ethanol/ethyl acetate mixture in ultrasonic intensified environment

    Mahdi, Taha, Ahmad, Arshad, Ripin, Adnan, Nasef, Mohamed
    Korean Journal of Chemical Engineering, 2014, Vol.31(5), pp.875-880 [Peer Reviewed Journal]

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    6-Lump Kinetic Model for a Commercial Vacuum Gas Oil Hydrocracker

    Sadighi, Sepehr, Ahmad, Arshad, Seif Mohaddecy, S. Reza
    International Journal of Chemical Reactor Engineering, 2010, Vol.8(1) [Peer Reviewed Journal]
    Walter de Gruyter GmbH
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    Title: 6-Lump Kinetic Model for a Commercial Vacuum Gas Oil Hydrocracker
    Author: Sadighi, Sepehr; Ahmad, Arshad; Seif Mohaddecy, S. Reza
    Publisher: De Gruyter
    Subject: Vacuum Gas Oil ; Hydrocracking ; Lump Kinetic Model ; Catalyst Life ; Isomax
    Description: A 6-lump kinetic model, including a catalyst decay function for hydrocracking of vacuum gas oil in a commercial plant, is proposed. The model considers vacuum gas oil (VGO) and unconverted oil, having boiling point higher than 380-°C (380+°C) as one lump. Other lumps are diesel (260-380-°C), kerosene (150-260-°C), heavy naphtha (90-150-°C), light naphtha (40-90-°C) and gases (40-°C) as products. Initially, a kinetic network with thirty coefficients is considered, but following an evaluation using measured data and order of magnitude analysis, mainly the route passes of converting middle distillates to naphtha lumps are omitted; thus the number of kinetic coefficients is reduced to eighteen. This result is consistent with the reported characteristics of amorphous catalyst, which has the tendency to produce more distillates than naphtha. By using catalyst decay function in the kinetic model and replacing days on stream with a noble term, called accumulated feed, the prediction of the final approach during 1.5 years is in good agreement with the actual commercial data. The average absolute deviation (AAD%) of the model is less than 5% for all main products. If the residue or unconverted VGO is considered, the error only increases to 6.94% which is still acceptable for a commercial model. The results also confirm that the hydrocracking of VGO to upgraded products is represented better by a second order reaction.
    Is part of: International Journal of Chemical Reactor Engineering, 2010, Vol.8(1)
    Identifier: 1542-6580 (E-ISSN); 10.2202/1542-6580.2164 (DOI)

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    Environmentally benign and highly regioselective ring opening of epoxides accelerated by ultrasound irradiation

    Nasef, Mohamed Mahmoud, Zakeri, Masoumeh, Asadi, Jahanbakhsh, Abouzari-Lotf, Ebrahim, Ahmad, Arshad, Malakooti, Reihaneh
    Green chemistry letters and reviews, 02 January 2016, Vol.9(1), pp.76-84 [Peer Reviewed Journal]

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    Thermogravimetric Analysis of Char Waste from the Air Gasification of Empty Fruit Bunch Briquette

    Nyakuma Bemgba Bevan, Mazangi Mojtaba, Johari Anwar, Ahmad Arshad, Tuan Abdullah Tuan Amran
    MATEC web of conferences, 01 July 2014, Vol.13, p.02004 [Peer Reviewed Journal]
    Directory of Open Access Journals (DOAJ)
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    Title: Thermogravimetric Analysis of Char Waste from the Air Gasification of Empty Fruit Bunch Briquette
    Author: Nyakuma Bemgba Bevan; Mazangi Mojtaba; Johari Anwar; Ahmad Arshad; Tuan Abdullah Tuan Amran
    Subject: Engineering
    Description: The thermal decomposition behavior of char waste produced from the air gasification of Empty Fruit Bunch (EFB) briquette was examined using thermogravimetric analysis (TGA). A comparison between the thermal decomposition behavior of char waste and EFB briquette is also presented. The results indicate that the char waste produced decreased from 22 % to 18 % with increasing temperature from 600 °C to 700 °C during gasification. This is due to the effect of high temperatures on the primary char decomposition reactions. It was observed that char degradation occurs in two steps; char degradation I & II with weight losses of 17 % and 32 % respectively. This showed that only ~ 50 % char was decomposed during thermal analysis, hence higher temperatures are required to ensure complete decomposition. The TGA curve for EFB briquette showed that complete thermal decomposition of EFB briquette occurs in four stages namely; drying, devolatization, reduction and char degradation. The most...
    Is part of: MATEC web of conferences, 01 July 2014, Vol.13, p.02004
    Identifier: 2261-236X (E-ISSN); 10.1051/matecconf/20141302004 (DOI)

    • Several versions

    The 3M National Teaching Fellowship: A High-Impact Community of Practice in Higher Education

    Acai, Anita, Ahmad, Arshad, Fenton, Nancy, Graystone, Leah, Phillips, Keegan, Smith, Ron, Stockley, Denise
    Teaching and learning inquiry, 2018, Vol.6(2), p.50 [Peer Reviewed Journal]

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    An Empirical Study of Investigating Mobile Applications Development Challenges

    Ahmad, Arshad, Li, Kan, Feng, Chong, Asim, Syed Mohammad, Yousif, Abdallah, Ge, Shi
    IEEE access, 2018, Vol.6, pp.17711-17728 [Peer Reviewed Journal]
    IEEE Conference Publications, IEEE Journals & Magazines , IEEE Xplore, IEEE Journals & Magazines
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    Title: An Empirical Study of Investigating Mobile Applications Development Challenges
    Author: Ahmad, Arshad; Li, Kan; Feng, Chong; Asim, Syed Mohammad; Yousif, Abdallah; Ge, Shi
    Subject: Mobile Applications ; Application Programming Interfaces ; Mobile Communication ; Interviews ; Organizations ; Software Engineering ; Quality Assessment ; Mobile Application Development ; Mobile Apps Development ; Mobile Application Software Engineering ; Challenges and Barriers ; Empirical Study ; Engineering
    Description: Context: mobile application development is rapidly evolving with substantial economic and scientific interest. One of the primary reasons for mobile application development failure is the increasing number of mobile platforms; some organizations endorse mobile application development before understanding the associated development challenges of each target platform. Objective: the objective of this paper is to identify the challenges of native, web, and hybrid mobile applications, which can undermine the successful development of such applications. Method: we adopted a two-phase research approach: at first, the challenges were identified via a systematic literature review (SLR); and then, the identified challenges were validated through conducting interviews with practitioners. Results: through both research approaches, we identified nine challenges vital to the success of mobile application development and four additional challenges from interviews not reported in the literature....
    Is part of: IEEE access, 2018, Vol.6, pp.17711-17728
    Identifier: 2169-3536 (E-ISSN); 10.1109/ACCESS.2018.2818724 (DOI)

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    Torrefaction of Pelletized Oil Palm Empty Fruit Bunches

    Nyakuma, Bemgba Bevan, Ahmad, Arshad, Johari, Anwar, Abdullah, Tuan Amran Tuan, Oladokun, Olagoke
    Cornell University
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    Title: Torrefaction of Pelletized Oil Palm Empty Fruit Bunches
    Author: Nyakuma, Bemgba Bevan; Ahmad, Arshad; Johari, Anwar; Abdullah, Tuan Amran Tuan; Oladokun, Olagoke
    Subject: Physics - Physics And Society
    Description: The torrefaction of oil palm Empty Fruit Bunch (EFB) briquettes was examined in this study. The results indicate that temperature significantly influenced the mass yield, energy yield and heating value of oil palm empty fruit bunch (OPEFB) briquettes during torrefaction. The solid uniform compact nature of EFB briquettes ensured a slow rate of pyrolysis or devolatization which enhanced torrefaction. The mass yield decreased from 79.70 % to 43.03 %, energy yield from 89.44 % to 64.27 % during torrefaction from 250 {\deg}C to 300 {\deg}C. The heating value (HHV) of OPEFB briquettes improved significantly from 17.57 MJ/kg to 26.24 MJ/kg after torrefaction at 300 {\deg}C for 1 hour. Fundamentally, the study has highlighted the effects of pelletization and torrefaction on solid fuel properties of oil palm EFB briquettes and its potential as a solid fuel for future thermal applications. Comment: 5 pages, 2 Figures
    Identifier: 1505.05469 (ARXIV ID)

    • Several versions

    An Optimized Covalent Immobilization of Glucamine on Electrospun Nanofibrous Poly(vinylidene fluoride) Sheets Grafted with Oxirane Groups for Higher Boron Adsorption

    Nallappan, Madana, Nasef, Mohamed, Ting, Teo, Ahmad, Arshad
    Fibers and Polymers, 2018, Vol.19(8), pp.1694-1705