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  • Küçük Resim
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    Co-B-F ve Co-B-P katalizörleri kullanılarak NaBH4’den hidrojen üretimine NaOH’in etkisi
    (Selçuk Üniversitesi Mühendislik Fakültesi, 2016) İzgi, Mehmet Sait; Ödemiş, Ömer; Şahin, Ömer; Saka, Cafer
    Bu çalışmada sodyum borhidrürün hidrolizi ile hidrojen üretimi için Co-B-P ve Co-B-F katalizörleri sentezlenmiştir. Sodyum borhidrürden hidrojen üretiminde stabiliteyi sağlamak amacıyla kullanılan sodyum hidroksit konsantrasyonu oldukça önem arz etmekte zira fazla kullanılması durumunda katalizörün katalitik aktivitesini azaltırken, az kullanılması ya da hiç kullanılmaması durumunda ise sodyum borhidrürün kendiliğinden bozunması gerçekleşmektedir. Bu nedenle sentezlenen Co-B-F ve Co-B-P katalizörlerinin sodyum borhidrürün hidrolizinde kullanılması durumundaki optimum sodyum hidroksit konsantrasyonları belirlenmiştir. Farklı sodyum hidroksit konsantrasyonları varlığında reaksiyon hızlarına etkileri ve reaksiyon hız sabitlerine etkileri ayrı ayrı belirlenerek sodyum hidroksit konsantrasyonunun sodyum borhidrürün hidrolizi ile hidrojen üretimi üzerinde ne kadar etkin ve önemli olduğu belirlenmiştir. Co-B-F katalizörü için hidrojen üretim hızı %2,5 NaOH konsantrasyonu varlığında 2400 ml/dk.katalizör, Co-B-P katalizörü için ise 1605 mL/dk.katalizör olarak belirlenmiştir.
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    A novel thermal process for activated carbon production from the vetch biomass with air at low temperature by two-stage procedure
    (ELSEVIER SCIENCE BV, 2013) Ceyhan, Ayhan Abdullah; Sahin, Omer; Saka, Cafer; Yalcin, Ali
    The method differs from a known method for the pyrolysis processing of agriculture waste. In this article, a novel thermal process of producing activated carbon from the vetch at low temperature by air is discussed. This paper reports the preparation of activated carbon with two-stage pyrolysis with air from the vetch by zinc chloride activation. The experiments in this study vary the pre- and post-treatment procedures, the impregnation ratio of the activating agent, and the carbonization temperature. The pyrolysis was carried out at different low activation temperatures in the range of 30-80 and 240-400 degrees C. Adsorption capacity was demonstrated with BET and iodine number. The respective highest BET surface area and iodine number for the produced activated carbons was obtained as 1287 m(2)/g and 1004 mg/g. SEM evaluated the structural morphology of activated carbons. The surface chemical characteristics of activated carbons were determined by FTIR spectroscopic method. The use of low temperature chemical carbonization has the potential to further improve the economics of generating activated carbon. (C) 2013 Elsevier B.V. All rights reserved.
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    Preparation of High Surface Area Activated Carbon from Elaeagnus angustifolia Seeds by Chemical Activation with ZnCl2 in One-Step Treatment and its Iodine Adsorption
    (TAYLOR & FRANCIS INC, 2015) Sahin, Omer; Saka, Cafer; Ceyhan, Ayhan Abdullah; Baytar, Orhan
    The present study was conducted with the preparation of activated carbon through one-step chemical activation using zinc chloride (ZnCl2) as the activating agent from Elaeagnus angustifolia seeds (EAS). The effect of impregnation ratio, activation temperature, and activation time on activated carbon surface area was discussed. The properties of activated carbon were characterized by N-2 adsorption (BET), thermogravimetric analyses (TGA), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The best conditions for preparing activated carbon were identified to be temperature of 500 degrees C, impregnation ratio of 150%, impregnation time of 48 h, and activation time of 60 min with BET surface area of 1836 m(2)/g. The adsorption capacity was demonstrated by the iodine numbers.
  • Küçük Resim Yok
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    The pyrolysis process of biomass by two-stage chemical activation with different methodology and iodine adsorption
    (TAYLOR & FRANCIS INC, 2016) Sahin, Omer; Saka, Cafer; Ceyhan, Ayhan Abdullah; Baytar, Orhan
    Current concerns with the high energy/cost nature of activated carbon production have encouraged research into alternative activated carbon production methods to reduce the environmental impact. The purpose of this study is to produce the activated carbon from biomass (carob bean seed husk, CBSH) by chemical activation with a different methodology using zinc chloride. Two different activation temperature methodologies for the preparation of activated carbons were applied at the ranges of 30-80 and 200-350 degrees C. The effects of the pre-activation and activation temperatures, duration time, and the impregnation ratio on the surface and chemical properties of activated carbon were investigated. Studies were conducted on the adsorption of iodine from the prepared activated carbon. The highest iodine adsorption number was achieved as 874 mg/g. Langmuir surface area was 1544 m(2)/g. The structural morphology of activated carbons was evaluated with a scanning electron microscope. The surface chemical characteristics of activated carbons were determined by the Fourier transform infrared (FTIR) spectroscopic method.