1. Onukwuli, O.D., C. Esonye and A.U. Ofoefule, 2021. Combustion exhaust release impact, diesel engine performance, and optimization studies of green diesel-petrodiesel blend in a high compression ratio direct-injection compression-ignition engine. Adv. Mech. Eng., Vol. 13. 10.1177/16878140211018778.
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2. Onukwuli, D.O., C. Esonye, A.U. Ofoefule and R. Eyisi, 2021. Comparative analysis of the application of artificial neural network-genetic algorithm and response surface methods-desirability function for predicting the optimal conditions for biodiesel synthesis from Chrysophyllum albidum seed oil. J. Taiwan Inst. Chem. Eng., 125: 153-167.
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3. Esonye, C., O.D. Onukwuli, A.U. Ofoefule, C.S. Ume and N.J. Ogbodo, 2020. Sea Almond as a Promising Feedstock for Green Diesel: Statistical Optimization and Power Rate Law Based Chemical Kinetics of Its Consecutive Irreversible Methanolysis. In: Prunus, Küden, A. and A. Kuden (Eds.), IntechOpen, London, UK, ISBN: 978-1-83962-607-4, pp: 103-128.
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4. Ofoefule, A.U., J.C. Igweagwu, M.N. Ugwu, C.D. Mgbadike, C. Esonye, 2019. Effects of pine needle (Pinus pinaster) dust on the performance characteristics of sub-bituminous coal briquette for energy generation. J. Phys. Chem. Sci., Vol. 7. 10.5281/zenodo.2639876.
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5. Ofoefule, A.U., C. Esonye, O.D. Onukwuli, E. Nwaeze and C.S. Ume, 2019. Modeling and optimization of African pear seed oil esterification and transesterification using artificial neural network and response surface methodology comparative analysis. Ind. Crops Prod., Vol. 140. 10.1016/j.indcrop.2019.111707.
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6. Esonye, C., O.D. Onukwuli, A.U. Ofoefule and E.O. Ogah, 2019. Multi-input multi-output (MIMO) ANN and Nelder-Mead’s simplex based modeling of engine performance and combustion emission characteristics of biodiesel-diesel blend in CI diesel engine. Appl. Therm. Eng., 151: 100-114.
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7. Esonye, C., O.D. Onukwuli and A.U. Ofoefule, 2019. Optimization of methyl ester production from Prunus amygdalus seed oil using response surface methodology and Artificial neural networks. Renewable Energy, 130: 61-72.
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8. Esonye, C., O.D. Onukwuli and A.U. Ofoefule, 2019. Effects of process variables on the yield and viscosity of methyl esters derived from Prunus amygdalus, Dyacrodes edulis and Chrysophyllum albidium. Sigma J. Eng. Nat. Sci., 37: 25-40.
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9. Esonye, C., O.D. Onukwuli and A.U. Ofoefule, 2019. Chemical kinetics of a two-step transesterification of Dyacrodes edulis seed oil using acid-alkali catalyst. Chem. Engr. Res. Design, 145: 245-257.
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10. Esonye, C., O.D. Onukwuli and A.U. Ofoefule, 2019. Characterization and oxidation modeling of oils from Prunus amygdalus, Dyacrodes edulis and Chrysophyllum albidium. Ind. Crop Prod., 128: 298-307.
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11. Esonye, C., O.D. Onukwuli, A.U. Ofoefule and S.O. Momoh, 2018. Modeling of biodiesel yield from African pear seed (Dyacrodes edulis) oil using artificial neural networks. J. Nig. Soc. Chem. Engr., 33: 26-35.
12. Esonye, C., O.D. Onukwuli and A.U. Ofoefule, 2018. The influence of fatty acid composition and functional groups on fuel related properties of sweet almond (Prunus amygdalus dulcis) seed oil methyl esters. Der Pharm. Chem., 10: 207-214.
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13. Esonye, C., O.D. Onukwuli and A.U. Ofoefule, 2018. The effects of fatty acid methyl ester-petrodiesel blend on the co and noxemissions toxicity in ci diesel engine. J. Chem. Pharm. Res., 10: 111-115.
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14. Esonye, C., O.D. Onukwuli and A.U. Ofoefule, 2017. Synthesis and Physico-chemical Studies of base catalyzed methanolysis of some virgin tropical seed oils. World News Natur. Sci., 15: 112-128.
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15. Chizoo, C., C.S. Ume, M.C. Esonye, V.N. Okafor and A.U. Ofoefule, 2017. Extraction of nigerian beef tallow by wet rendering process and its characterization. World New Nat. Sci., 15: 129-138.
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16. Uzodinma, E.O., A.U. Ofoefule and I.E. Nwaoha, 2016. Assessment of biogas potentials of blends of orange (Citrus Sinensis) peels with selected food wastes. J. Renewable Alter. Energy Technol., 2: 22-31.
17. Kurawa, A.S. and A.U. Ofoefule, 2016. Jatropha yield improvement and tissue culture protocol. J. Renewable Alter. Energy Technol., 1: 72-79.
18. Ofoefule, A.U., U.C. Okoro and O.D. Onukwuli, 2015. Modelling of gelatinization time against water content for some starch feedstock for ethanol production. Chem. Sci. Trans., 5: 35-40.
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19. Ofoefule, A.U., U.C. Okoro and O.D. Onukwuli, 2015. Effect of water content of starch slurry on the gelatinization profile of some biomass feedstock for bioethanol production. J. Renewable Alter. Energy Technol., 1: 124-129.
20. Ofoefule, A.U., U.C. Okoro and O.D. Onukwuli, 2015. Effect of hydrolysis reaction time on the reducing sugar yield of Tacca (Tacca involuncrata) and Tigernut (Cyperus esculentus) starch for bioethanol production. Der Pharm. Chem., 7: 324-329.
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21. Ofoefule, A.U., U.C. Okoro and O.D. Onukwuli, 2015. Effect of hydrolysis reaction time on the reducing sugar yield of Acha (Digitaria exilis) and Finger millet (Eleusine coracana) starch for bioethanol production. Chem. Sci. Trans., Vol. 4. http://www.e-journals.in/login/galley/986.pdf.
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22. Ofoefule, A.U and C.F. Ozonu, 2015. Comparative study of the effect of reaction time on the biodiesel yield from crude and refined palm kernel (Elaeis Guineensis) oil. Nig. J. Solar Energy, 26: 129-134.
23. Ofoefule, A.U., S.C. Eze, C.N. Ibeto and R.N. Onah, 2014. The use of some bio-fertilizers as sources of soil amendment for sweet potato (Ipomea batatas) production. Bas. Res. J. Agric. Sci. Rev., 3: 23-28.
24. Ofoefule, A.U., C.N. Ibeto, L.C. Ugwu and D.C. Eze, 2014. Determination of optimum reaction temperature and reaction time for biodiesel yield from coconut (Cocos nucifera) oil. Int. Res. J. Pure Applied Chem., 4: 108-117.
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25. Ofoefule, A.U., 2014. Effect of combining optimum production parameters on the biodiesel yield from Coconut (Cocos nucifera) oil. Nig. J. Solar Energy, 25: 104-107.
26. Ofoefule, A.U., 2014. Comparison of the biodiesel production from Coconut (Cocos nucifera) oil using the two-stage method and the single stage base method. Nig. J. Solar Energy, 25: 80-84.
27. Ibeto, C.N., C.O.B. Okoye and A.U. Ofoefule, 2014. Bio-ethanol production from thermally pre-treated corn chaff and cassava waste water. Int. Res. J. Pure Applied Chem., 4: 227-233.
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28. Ofoefule, A.U., U.C. Okoro, O.D. Onukwuli and C.N. Anyanwu, 2013. Biogas production from waste by-products of ethanol production: 3 modeling of gas yield with time. Phys. Rev. Res. Int., 3: 18-27.
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29. Ofoefule, A.U., C.N. Ibeto, U.C. Okoro and O.D. Onukwuli, 2013. Biodiesel production from tigernut (Cyperus esculentus) oil and characterization of its blend with Petro-diesel. Phys. Rev. Res. Int., 3: 145-153.
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30. Ofoefule, A.U., C.N. Ibeto and I.E. Ugwuamoke, 2013. Determination of optimum catalyst concentration for biodiesel yield from coconut (Cocos nucifera) oil. Int. Res. J. Pure Applied Chem., 3: 357-365.
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31. Ibeto, C.N., A.U. Ofoefule and A.A. Ofomatta, 2013. Bioethanol production from acid Pre-treated Banana (Musa aluminata) peels. Nig. J. Solar Energy, 24: 15-17.
32. Ofoefule, A.U., U.C. Okoro and O.D. Onukwuli, 2012. Biogas production from waste by-products of ethanol production: 2. Effect of batch co-digestion with some animal and plant wastes on biogas production. Int. J. Curr. Res., 4: 086-091.
33. Ofoefule, A.U., U.C. Okoro and O.D. Onukwuli, 2012. Biogas production from waste by-products of ethanol production: 1. Digestion of pure wastes. Int. J. Curr. Res., 4: 82-85.
34. Ofoefule, A.U., C.N. Ibeto and O.D. Onukwuli, 2012. Optimization of the biogas production from blends of powdered rice husk and brewery spent grain by chemical treatment. Int. J. Curr. Res., 4: 105-108.
35. Ofoefule, A.U. and C.N. Ibeto, 2012. Effect of chemical treatment on biogas production from bambara nut (vigna subterranea) chaff and its blend with some wastes. Proceedings of the International Conference on Energy and Sustainable Development: Issues and Strategies (ESD 2010). June 2-4, 2010, IEEE Xplore, Tunis, Tunisia, pp: 1-8.
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36. Ibeto, C.N., C.O.B. Okoye, A.U. Ofoefule and E.U. Uzodinma, 2012. Analysis of Environmental Pollutants by Atomic Absorption Spectrophotometry. In: Macro to Nano Spectroscopy, Uddin, J. (Ed.). Intech Open Access Publisher, Rijeka, Croatia, ISBN-13: 9789535106647, pp: 25-50.
37. Ibeto, C.N., C.O.B. Okoye and A.U. Ofoefule, 2012. Comparative study of the physicochemical characterization of some oils as potential feedstock for biodiesel production. Int. Scholarly Res. Notic., 10.5402/2012/621518.
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38. Uzodinma, E.O., A.U. Ofoefule and N.J. Enwere, 2011. Optimization of biogas fuel production from maize (Zea mays) bract waste: Comparative study of biogas production from blending maize bract with biogenic wastes. Am. Food Nutr., 1: 1-6.
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39. Ofoefule, A.U., P.M. Ejikeme, C.N. Ibeto and T. Afuaku, 2011. Effect of chemical treatment and waste blending on biogas production from leaf litter of Kambala (Chlorophoral excels). Int. J. Phys. Sci., 6: 7811-7815.
40. Ofoefule, A.U., M.C. Onyeoziri and E.O. Uzodinma, 2011. Comparative study of biogas production from chemically-treated powdered and un-powdered rice husks. J. Environ. Chem. Ecotoxicol., 3: 75-79.
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41. Ofoefule, A.U., J.I. Nwankwo, C.N. Ibeto and M.I. Ezeh, 2011. Comparative study of the biogas production potentials of Plantain peels and its blend with some animal wastes. Nig. J. Solar Energy, 22: 156-162.
42. Ofoefule, A.U., E.U. Uzodinma and C.N. Ibeto, 2011. Waste Water: Treatment Options and Associated Benefits. In: Waste Water-Evaluation and Management, Einschlag, F.S.G. (Ed.). Intech Open Access Publisher, Rijeka, Croatia, pp: 431-446.
43. Ofoefule, A.U., 2011. Investigation of the biogas production potentials of Bambara nut chaff (Vigna subterranean). Adv. Applied Sci. Res., 2: 55-61.
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44. Ofoefule, A.U. and C.N. Ibeto, 2011. Investigation of the biogas production potentials from printing paper waste. Nig. J. Solar Energy, 22: 144-149.
45. Ibeto, C.N., A.U. Ofoefule and K.E. Agbo, 2011. A global overview of biomass potentials for bioethanol production: A renewable alternative fuel. Trends Applied Sci. Res., 6: 410-425.
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46. Ibeto, C.N., A.U. Ofoefule and H.C. Ezugwu, 2011. Analytical methods for quality assessment of biodiesel from animal and vegetable oils. Trends Applied Sci. Res., 6: 537-553.
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47. Ibeto, C.N., A.U. Ofoefule and H.C. Ezeugwu, 2011. Fuel quality assessment of biodiesel produced from groundnut oil (Arachis hypogea) and its blend with petroleum diesel. Am. J. Food Technol., 6: 798-803.
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48. Uzodinma, E.O., A.U. Ofoefule and C.N. Ibeto, 2010. Comparative study of biogas production from almond (Prunus dulcis), avocado (Persea Americana) and kola nut (Cola vera) tree leaf litters. Nig. J. Solar Energy, 20: 140-144.
49. Ofoefule, A.U., P.U. Chima, M.N. Nnabuchi and E.O. Uzodinma, 2010. Anaerobic batch co-digestion of cassava waste water and Swine dung. Nig. J. Solar Energy, 20: 128-132.
50. Ofoefule, A.U., J.I. Nwankwo and C.N. Ibeto, 2010. Biogas production from paper waste and its blend with cow dung. J. Adv. Appl. Sci. Res., 1: 1-8.
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51. Ofoefule, A.U., E.O. Uzodinma and C.N. Anyanwu, 2010. Studies on the effect of anaerobic digestion on the microbial flora of animal wastes 2: digestion and modelling of process parameters. Trends Applied Sci. Res., 5: 39-47.
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52. Ofoefule, A.U., E.L. Eme, E.O. Uzodinma and C.N. Ibeto, 2010. Comparative study of the effect of chemical treatments on cassava (Manihot utilissima) peels for biogas production. Scient. Res. Essays, 5: 3808-3813.
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53. Ofoefule, A.U. and O.D. Onukwuli, 2010. Biogas production from blends of bambara nut (Vigna subterranean) chaff with some animal and plant wastes. Adv. Applied Sci. Res., 1: 98-105.
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54. Ibeto, C.N. and A.U. Ofoefule, 2010. Biogas generation: A solution to environmental pollution in Nigeria. Chem. Nig., 3: 31-33.
55. Emeje, M.O., S.I. Ofoefule, A.C. Nnaji, A.U. Ofoefule and S.A. Brown, 2010. Assessment of bread safety in Nigeria: Quantitative determination of potassium bromate and lead. Afr. J. Food Sci., 4: 394-397.
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56. Uzodinma, E.O. and A.U. Ofoefule, 2009. Biogas production from blends of field grass (Panicum maximum) with some animal wastes. Int. J. Phys. Sci., 4: 091-095.
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57. Ofoefule, A.U., E.O. Uzodinma and O.D. Onukwuli, 2009. Comparative study of the Effect of different pretreatment methods on the Biogas yield from Water Hyacinth (Eichorrnia Crassipes). Int. J. Phys. Sci., 4: 535-539.
58. Ofoefule, A.U., C.N. Ibeto, C.C. Uzoma and O.U. Oparaku, 2009. Biomass technology: A key driver for improving climate change and socio-economic life in Nigeria. Int. J. Environ. Sci., 5: 54-58.
59. Uzodinma, E.O., A.U. Ofoefule, J.I. Eze, I. Mbaeyi and N.D. Onwuka, 2008. Effect of some organic wastes on the biogas yield from carbonated soft drink sludge. Scient. Res. Essays, 3: 401-405.
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60. Uzodinma, E.O. and A.U. Ofoefule, 2008. Effect of abattoir cow liquor waste on biogas yield of some agro-industrial wastes. Scient. Res. Essays, 3: 473-476.
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61. Okoro, U.C. and A.U. Ofoefule, 2008. Synthesis of some new aryl derivatives of 1, 11- diaza-5H-a-phenothiazine-5-one. Int. J. Chem., 18: 109-115.
62. Ofoefule, A.U., E.O. Uzodinma, P.O. Ukoha, U.C. Okoro and O.D. Onukwuli, 2008. Biofuels potential in Nigeria and the future of petroleum. Nig. J. Solar Energy, 19: 73-77.
63. Ofoefule, A.U. and E.O.U. Uzodinma, 2008. Effect of chemical and biological treatment on Pre-decayed field grass (Panicum maximum) for biogas production. Nig. J. Solar Energy, 19: 58-62.
64. Ofoefule, A.U. and E.O.U. Uzodinma, 2008. Biogas production from blends of cassava (Manihot utilissima) peels with some Animal wastes. Int. J. Phs. Sci., 4: 398-402.
65. Uzodinma, E.O.U., A.U. Ofoefule, J.I. Eze and N.D. Onwuka, 2007. Preliminary studies on the biogas production from blends of palm oil sludge with some Agro-based wastes. Nig. J. Solar Energy, 18: 116-120.
66. Uzodinma, E.O.U., A.U. Ofoefule, J.I. Eze and N.D. Onwuka, 2007. Biogas production from blends of powdered rice husk with some Agro-industrial wastes. J. Eng. Applied Sci., 3: 95-99.
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67. Uzodinma, E.O.U., A.U. Ofoefule, J.I. Eze and N.D. Onwuka, 2007. Biogas production from blends of agro-industrial wastes. Trends Applied Sci. Res., 2: 554-558.
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68. Uzodinma, E.O.U., A.U. Ofoefule, J.I. Eze and N.D. Onwuka, 2007. Optimum mesophilic temperature of biogas production from blends of Agro-industrial wastes. Trends Applied Sci. Res., 2: 39-44.
69. Ofoefule, A.U., G.O. Unachukwu and O.U. Oparaku, 2006. Comparative performance evaluation of charcoal cookstoves. Nig. J. Solar Energy, 16: 187-194.
70. Ofoefule, A.U. and E.U. Uzodinma, 2006. Optimization of the qualitative and quantitative biogas yield from poultry waste. Nig. J. Solar Energy, 16: 206-211.
71. Ofoefule, A.U. and E.U. Uzodinma, 2005. Studies on the effect of anaerobic digestion on microbial flora of animal wastes 1 Isolation and identification of common pathogens. Nig. J. Solar Energy, 15: 34-37.