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Determining number of sites on ceria stabilizing single atoms via metal nanoparticle redispersion

Chinese Journal of Catalysis 2020年第6期41卷 998-1005页

作者： aisulu aitbekova Cody JWrasman Andrew RRiscoe Larissa YKunz Matteo Cargnello Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis Stanford UniversityStanfordCalifornia 94305United States

Single atom catalysts have recently attracted interest due to their maximization of the utilization of expensive noble metals as well as their unique catalytic properties. Based on its surface atomic properties, CeO2 is one of the most common supports for stabilizing single metal atoms. Many single atom catalysts are limited in their metal contents by the formation of metal nanoparticles once the catalyst support capacity for single atoms has been exceeded. Currently, there are no direct measurements to determine the capacity of a support to stabilize single atoms. In this work we develop a nanoparticle-based technique that allows for quantification of that capacity by redispersing Ru nanoparticles into single atoms and taking advantage of the different catalytic properties of Ru single atoms and nanoparticles in the CO2 hydrogenation reaction. This method avoids complications in metal loading caused by counterions in incipient wetness impregnation and can eventually be applied to a variety of different metals. Results using this technique follow trends in oxygen vacancy concentration and surface oxygen content and show promise as a new method for quantifying support single atom stabilization capacity.

关键词： Ceria Single-atom catalyst Oxygen vacancies CO2 hydrogenation Redispersion

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An Assessment of Awareness of Specialists in Adequate Diagnostics of Chronic Pancreatitis in Kazakhstan

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Open Journal of Epidemiology 2020年第4期10卷 446-462页

作者： Jamilya Kaibullayeva Alexander Nersesov Almagul Jumabayeva Zhanna Romanova Aliya Ualiyeva Nurailym Abu aisulu Gainutdin Department of Gastroenterology and Hepatology Kazakh National Medical University Almaty Kazakhstan Department of Epidemiology Biomedstatistics and Evidence-Based Medicine Al-Farabi Kazakh National University of Almaty Almaty Kazakhstan

Our national center of gastroenterology provides highly specialized care, including chronic pancreatitis. Another area of our activities is educational programs, including postgraduate and fellows’ courses. Thereby, we have noted significant gaps in the knowledge of the specialists that involved in the chronic pancreatitis management. The most critical downsides are related to insufficient attention to etiology and risk factors, using outdated classifications, the lack of knowledge in arsenal of diagnostic techniques, polypharmacy or application of low level of evidence treatment methods. Finally, we have made amendments in the National Clinical Protocol in Chronic Pancreatitis [1], updated the State Educational Standard for residents of the gastroenterological profile [2]. The aim of the study was the analysis of the basic knowledge among different specialists in the management of chronic pancreatitis (CP) around the country. This qualitative study consists of two parts, including focus group interviews followed by interviews with the specialists across the country, which was conducted during the period 2015-2018. In this paper, we present results of diagnostic approaches at the different levels of medical care. The general practitioners have noted the absence of modern methods of laboratory and visual diagnostics in their routine practice, therefore explaining the plenty of the complicated forms. Another issue is the low specialist’s adherence to clinical guidelines, poor knowledge of the risk factors and overestimation of the clinical presentation value except malnutrition symptoms. On the other hand, surgeons and other specialists are not ready to implement modern diagnostic tools and methods in their practice. Obviously, in accordance with the results of our study, our educational center should conduct a number of training activities, as well as develop new algorithms for medical care specialists.

关键词： Non-Interventional Diagnostic Methods Chronic Pancreatitis Symptoms Clinical Guidelines Specialist’s Awareness

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An Assessment of Awareness of Specialists in Adequate Diagnostics of Chronic Pancreatitis in Kazakhstan

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Open Journal of Epidemiology（流行病学期刊） 2020年第4期

作者： Jamilya Kaibullayeva Alexander Nersesov Almagul Jumabayeva Zhanna Romanova Aliya Ualiyeva Nurailym Abu aisulu Gainutdin

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