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FTIR Spectroscopic and Computational Studies on Hydrogen Adsorption on the Zeolite Li–FER

Author: P. Nachtigall
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2008 Volume: 4 Issue: 2 Pages: 21-27
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The interaction, at a low temperature, between molecular hydrogen and the zeolite Li–FER was studied by means of variable temperature infrared spectroscopy and theoretical calculations using a periodic DFT model. The adsorbed dihydrogen molecule becomes infrared active, giving a characteristic IR absorption band (H–H stretching) at 4090cm–1. Three different Li+ site types with respect to H2 adsorption were found in the zeolite, two of which adsorb H2. Calculations showed a similar interaction energy for these two sites, which was found to agree with the experimentally determined value of standard adsorption enthalpy of H0=–4.1(±0.8)kJ.mol–1. The results are discussed in the broader context of previously reported data for H2 adsorption on Na–FER and K–FER.


Article
EFFECTS OF ACETIC ACID AND HYDROGEN PEROXIDE ON THE MICROBIOLOGICAL QUALITY AND SKIN APPEARANCE OF POULTRY CARCASSES
تأثير حامض الخليك وبيروكسيد الهيدروجين على المحتوى الميكروبي ومظهر الجلد لذبائح الدواجن

Author: AlaaT.Abdul Wahid آلاء طارق عبد الواحد
Journal: Basrah Journal of Veterinary Research. مجلة البصرة للابحاث البيطرية ISSN: 18138497 Year: 2008 Volume: 7 Issue: 2 Pages: 97-100
Publisher: Basrah University جامعة البصرة

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Abstract

The microbiological quality and skin appearance of poultry carcasses were determined after acetic acid and hydrogen peroxide spray. Acetic acid at 1% concentrations showed a significant effect(P<0.05)in reducing total mesophilic bacteria count, total coli form count, Escherichia coli count and Staphylococcus aureus count when compared with a sample without treatment,10.50x103,1.03x103,7.5x101,1.05 x102 and 27.47x103, 2.71x103, 4.41x102, 2.74x102 cfu/cm2 respectively. No differences were observed in skin appearance due to 1% acetic acid treatment. Hydrogen perioxide at 1% concentrations did not significantly(P>0.05) effect the microbial load when compared with asample without treatment,26.33x103, 2.61x103,3.70x102,2.63x102and 27.47x103 ,2.71x103,4.41x102,2.74x102 cfu/cm2 respectively. The skin of carcasses treated with H2O2 ,was bleached and bloated.

تم استقصاء تاثير المعامله الكيميائيه باستخدام حامض الخليك وبيروكسيد الهيدروجين على النوعيه الميكروبيه ومظهر الجلد لذيائح الدواجن،وقد اظهرت النتائج تاثير معنويا في معدلات العد البكتير ي الكلي، عد بكتريا القولون ، بكتريا الاشيريشيا القولونيه والمكورات العنقوديه الذهبيه المعامله بحامض الخليك بالمقارنه مع العينه الغبر معامله 10.5X 10 3 ، 1.03X 310، 7.5X 110 ، 1.05 X 210 و 27.47X 310، 2.71X 310 ،4.41X 210 ، 2.74X210 و.ت.م /سم2 على التوالي ، لم يلحظ اختلاف على مظهر الجلد للعينه المعامله بحامض الخليك. كما اوضحت النتائج ان اضافه بيروكسيد الهيدروجي الى ماء لم يوثر على النوعيه الميكروبيه للذبيحه بالمقارنه مع العينه الغبر معامله 26.33X 10 3،2.61 X 10 3،3.70X 10 2 ،2.63X 10 2 و 27.47X 310 ، 2.71X 310،4.41X 210 ، 2.74X210و.ت.م /سم2 على التوالي . جلد الذبيحة المعامله ببيروكسيد الهيدروجين اصبح مبيض ومنتفخ المظهر.

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