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Characterization and catalytic activity of soft-templated Ni0-ceO_(2) mixed oxides for CO and CO_(2) co-methanation

Frontiers of Chemical Science and Engineering 2021年第2期15卷 251-268页

作者： Luciano Atzori Maria Giorgia Cutrufello Daniela Meloni Barbara Onida delia Gazzoli Andrea Ardu Roberto Monaci Maria Franca Sini Elisabetta Rombi Department of Chemical and Geological Sciences University of Cagliari09042 Monserrato(CA)Italy Department of Materials Science and Chemical Engineering CR-INSTM for Materials with Controlled PorosityPolytechnic of Turin10129 TurinItaly Department of Chemistry University of Rome“La Sapienza”00185 RomeItaly

Nanosized NiO,ceO_(2) and NiO-ceO_(2) mixed oxides with different Ni/ce molar ratios were prepared by the soft template *** the samples were characterized by different techniques as to their chemical composition,structure,morphology and *** the catalysts submitted to the same reduction pretreatment adopted for the activity tests the surface basic properties and specific metal surface area were also *** and ceO_(2) nanocrystals of about 4 nm in size were obtained,regardless of the Ni/ce molar *** Raman and X-ray photoelectron spectroscopy results proved the formation of defective sites at the NiO-ceO_(2) interface,where Ni species are in strong interaction with the *** microcalorimetric and Fourier transform infrared analyses of the reduced samples highlighted that,unlike metallic nickel,ceO_(2) is able to effectively adsorb CO_(2),forming carbonates and hydrogen *** reduction in H2 at 400°C for 1 h,the catalytic performance was studied in the CO and CO_(2) co-methanation *** tests were performed at atmospheric pressure and 300°C,using CO/CO_(2)/H_(2) molar compositions of 1/1/7 or 1/1/5,and space velocities equal to 72000 or 450000 cm^(3)∙h^(-1)∙gcat^(-1).Whereas CO was almost completely hydrogenated in any investigated experimental conditions,CO_(2) conversion was strongly affected by both the CO/CO_(2)/H_(2) ratio and the space *** faster and definitely preferred CO hydrogenation was explained in the light of the different mechanisms of CO and CO_(2) *** a selected sample,the influence of the reaction temperature and of a higher number of space velocity values,as well as the stability,were also *** that the Ni content is optimized,the Nice system investigated was very promising,being highly active for the CO_(x) co-methanation reaction in a wide range of operating conditions and stable(up to 50 h)also when submitted to thermal stress.

关键词： soft template method Ni0-ceO_(2)catalystss CO and CO_(2)co-mtharation synthetic natural gas production

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Ten Rules of Foot Care—The Development of a Short Questionnaire for Patients with Diabetes

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Journal of Diabetes Mellitus 2021年第3期11卷 83-96页

作者： Ileana Antohe Alina delia Popa Nursing Department Faculty of Medicine “Gr. T. Popa” University of Medicine and Pharmacy Ia&#351 i Romania

Objective: The aim of this study was to develop and validate a questionnaire for patients with diabetes to assess the foot self-care. Methods: A validation study was carried out in a sample of 200 patients with diabetes. Item analyses included the assessment of difficulty index, discrimination capacity and the correlation of items with the total score of the questionnaire. Factor analysis was used to test construct validity. Test-retest reliability was assessed with a sample of 31 patients. Criterion validity was determined by comparing the scores of patients with a history of foot ulcers with the scores of patients without this complication. Results: The internal consistency assessed by the Cronbach’s alpha (0.731) and test-retest reliability (r = 0.714, p = 0.001) for all sections were acceptable. Factor analysis revealed three factors: foot care, footwear and foot-damaging behavior, which explained 54.34% of the variance. All items had factor loading of greater than 0.4. Patients with diabetic neuropathy had a lower score after completing the foot care education questionnaire (Mann-Whitney U, p Conclusion: This questionnaire meets the reliability and validity conditions necessary for its application in our patients with diabetes.

关键词： Diabetes Mellitus Foot Care Validation Study Diabetic Foot Ulcers

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