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Effect of precipitants on Ni-CeO_2 catalysts prepared by a co-precipitation method for the reverse water-gas shift reaction

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Journal of Rare Earths 2013年第10期31卷 969-974页

作者：王路辉刘辉刘源陈英杨淑清 Department of Chemical Engineering School of Petrochemical Technology and Energy Engineering Zhejiang Ocean University School of Food and Pharmaceutical Zhejiang Ocean University Department of Catalysis Sciences and Technology School of Chemical Engineering Tianjin University

A series of Ni-CeO2 catalysts were prepared by co-precipitation method with Na2CO3, NaOH, and mixed precipitant （Na2CO3：NaOH; 1：1 ratio） as precipitant, respectively. The effect of the precipitants on the catalytic performance, physical and chemical properties of Ni-CeO2 catalysts was investigated with the aid of X-ray diffraction （XRD）, Bmmaner-Emmett-Teller method （BET）, Fou- rier-transform infrared spectroscopy （FT-IR）, thermogravimetry （TG）, and H2-TPR characterizations. The Ni-CeO2 catalysts were exam- ined with respect to their catalytic performance for the reverse water-gas shift reaction, and their catalytic activities were ranked as： Ni-CeO2-CP （Na2CO3：NaOH=I：I）〉Ni-CeO2-CP（Na2CO3）〉Ni-CeO2-CP（NaOH）- Correlating to the characteristic results, it was found that the catalyst prepared by co-precipitation with mixed precipitant （Na2CO3：NaOH; 1：1 ratio） as precipitant hadthe most amount of oxygen vacancies accompanied with highly dispersed Ni particles, which made the corresponding Ni-CeO2-CP（Na2CO3：NaOH=I： 1） catalyst exhibit the highest catalytic activity. While the precipitant of Na2CO3 or NaOH resulted in less or no oxygen vacancies in Ni-CeO2 catalysts. As a result, Ni-CeO2-CP（Na2CO3） and Ni-CeO2-CP（NaOH） catalysts presented poor catalytic performance.

关键词： reverse water-gas shift reaction Ni-CeO2 catalyst co-precipitation oxygen vacancy precipitant rare earths

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Pattern, precipitants and Short Term Outcome of Heart Failure Patients Managed at Federal Medical Centre Nguru, a Tertiary Health Centre in Yobe State Northeastern Nigeria

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International Journal of Clinical Medicine 2018年第5期9卷 432-444页

作者： Musa Mohammed Baba Faruk Buba Mohammed Abdullahi Talle Habu Abdul Department of Internal Medicine Federal Medical Centre Nguru Nguru Nigeria Department of Medicine College of Medical Sciences University of Maiduguri Maiduguri Nigeria

Heart Failure (HF) is a syndrome characterized by typical symptoms (e.g. breathlessness, ankle swelling and fatigue) that may be accompanied by signs (e.g. elevated jugular venous pressure, pulmonary crackles and peripheral oedema) caused by a structural and/or functional cardiac abnormality, resulting in a reduced cardiac output and/or elevated intracardiac pressures at rest or during stress. Clinical studies investigating the aetiological patterns of heart failure in Sub-Saharan Africa (SSA) revealed that hypertension, cardiomyopathy and rheumatic heart disease account for more than two-thirds of cardiac disease cases. The objective of this study therefore is to assess the pattern, precipitating factors and short term outcome of heart failure among patients admitted into our hospital. Method: The study was a prospective cross-sectional type conducted among in patients with heart failure in the medical ward of the hospital. Results: A total of three and fifty four (354) subjects were recruited into the study, comprising one hundred and twenty nine males (36.4%) and two hundred and twenty five (63.4%) females. Majority of the patients were admitted in NYHA functional class IV. This however improved to class II at discharge though few were discharged in NYHA class III. Heart failure secondary to progressive hypertensive heart disease was the most common (39.0%) followed by peripartum cardiomyopathy (22.6%) while idiopathic dilated cardiomyopathy (11.0%) and rheumatic heart disease (7.3%) were the third and fourth causes of heart failure respectively. The most common precipitating factor for heart failure in this study was chest infection (44.9%). In conclusion, the study revealed that progressive hypertensive heart disease was the leading cause of heart failure, followed by peripartum cardiomyopathy while idiopathic dilated cardiomyopathy and rheumatic heart disease were ranked third and fourth causes of heart failure respectively. Though myocardial infarction is on

关键词： Patterns precipitant Short Term Outcome Heart Failure

Investigation on the short-term outcome and prognostic impact of predisposition,and precipitants in inpatients with chronic liver disease from Chinese AcuTe on CHronic LIver FailurE(CATCH-LIFE)cohorts

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Portal Hypertension & Cirrhosis 2023年第3期2卷 115-126页

作者： Yan Zhang Wenting Tan Xiaobo Wang Xin Zheng Yan Huang Beiling Li Zhongji Meng Yanhang Gao Zhiping Qian Feng Liu Xiaobo Lu Jia Shang Yubao Zheng Weituo Zhang Shan Yin Wenyi Gu Tongyu Wang Jianyi Wei Zixuan Shen Guohong Deng Yi Zhou Yixin Hou Qun Zhang Shue Xiong Jing Liu Liyuan Long Ruochan Chen Jinjun Chen Xiuhua Jiang Sen Luo Yuanyuan Chen Chang Jiang Jinming Zhao Liujuan Ji Xue Mei Jing Li Tao Li Rongjiong Zheng Xinyi Zhou Haotang Ren Yu Shi Hai Li for the CATCH‐LIFE Study Investigators of Chinese(Acute‐on)Chronic Liver Failure(CLIF)Consortium(Ch‐CLIFC) Department of Gastroenterology Ren Ji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Shanghai Institute of Digestive Disease NHC Key Laboratory of Digestive DiseasesShanghaiChina Department of Infectious Diseases Southwest HospitalThird Military Medical University(Army Medical University)ChongqingChina Center of Integrative Medicine Beijing Ditan HospitalCapital Medical UniversityBeijingChina Department of Infectious Diseases Institute of Infection and ImmunologyUnion HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubeiChina Hunan Key Laboratory of Viral Hepatitis Department of Infectious DiseasesXiangya HospitalCentral South UniversityChangshaHunanChina Department of Infectious Diseases Hepatology UnitNanfang HospitalSouthern Medical UniversityGuangzhouGuangdongChina Department of Infectious Disease Taihe HospitalHubei University of MedicineShiyanHubeiChina Department of Hepatology The First Hospital of Jilin UniversityJilinChangchunChina Department of Liver Intensive Care Unit Shanghai Public Health Clinical CentreFudan UniversityShanghaiChina Tianjin Institute of Hepatology Nankai University Second People's HospitalTianjinChina Department of Infectious Diseases and Hepatology The Second Hospital of Shandong UniversityJinanShandongChina Infectious Disease Center The First Affiliated Hospital of Xinjiang Medical UniversityUrumqiXinjiangChina Department of Infectious Diseases Henan Provincial People's HospitalZhengzhouHenanChina Deparment of Infectious Diseases The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou CityGuangdongChina Clinical Research Center Shanghai Jiao Tong University School of MedicineShanghaiChina The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases The First Affiliated Hospital of School of MedicineZhejiang UniversityHangzhouZhejiangChina Collaborative Innovation Center for Diagnosis and Treatment of Infectious Disease HangzhouZhejiangChina Nati

Aim:The study aimed to investigate the short-term outcomes of hospitalized patients with chronic liver disease(CLDs)and assess the prognostic impact of predisposition and precipitants,which currently remains ***:The study included 3970 hospitalized patients with CLDs from two prospective longitudinal multicenter studies(NCT02457637 and NCT03641872)conducted in highly endemic hepatitis B virus(HBV)*** risk analysis was used to evaluate the effect of predispositions,including the etiology and severity of CLDs and precipitants;on sequential 28,90,and 365-day liver transplantation(LT)-free ***:Among all enrolled patients,76.8%of adverse outcomes(including death and LT)within one year occurred within 90 *** with alcoholic etiology,the association of HBV etiology with poorer outcomes was remarkably on the 28th day(hazard ratio[HR],1.81;95%confidence interval[CI],1.07-3.06;p=0.026);however,and dimin-ished or became insignificant at 90 days and 365 *** increased the adjusted risk for 365-day(HR,1.50;CI,1.13-1.99;p=0.004)LT-free mortality when compared with *** patients with cirrhosis,prior decompensation(PD)independently increased the adjusted risk of 365-day LT-free mortality by 1.25-fold(p=0.021);however,it did not increase the risk for 90-day *** the category nor the number of precipitants influenced the adjusted risk of 28 or 90-day LT-free ***:The 90-day outcome should be considered a significant endpoint for evaluating the short-term prognosis of hospitalized patients with *** factors,other than etiology,mainly affected the delayed(365-day)*** effective therapy for CLD etiology,especially antiviral treatments for HBV,and post-discharge long-term surveillance monitoring in cirrhotic patients undergoing PD are suggested to enhance disease management and reduce mortality.

关键词： cirrhosis precipitant prior decompensation short‐term mortality

Characteristics of Subaerial Karstification and Late Reconstruction in the Dengying Formation,Sichuan Basin,Southwestern China

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Journal of Earth Science 2010年第3期21卷 290-302页

作者：王国芝刘树根马永生徐国盛蔡勋育 School of Earth Science Chengdu University of Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Southern Exploration and Development Division Company SINOPEC

Tectonic uplift at the end of Sinian resulted in the denudation of the Dengying （灯影） Formation on a different scale and the development of a great number of secondary dissolution vugs beneath the unconformity between Sinian and *** and geochemical characteristics such as the development of caves,sinkholes,karst tubes and weathering crust,abrupt depletion and negative deflection of δ13C and δ18O in country rock and vug filling toward unconformity surface suggest that subaerial karstification is responsible for the development of secondary karst vugs within 150 m or so beneath the unconformity *** kind of secondary dissolution vug was partially or completely filled by different stage dolomite,calcite,quartz and bitumen during the later deep burial and *** such as the obvious difference in δ13C and δ18O of the filling in the subaerial karst vug from the country rock and the value of δ13C and δ18O of the filling increasing or decreasing with that of the country rocks,suggest that the hydrothermal fluid charged in vugs is allogenic *** karstification vug acted as a conduit for allogenic corrosive fluid which can create new secondary vugs and enlarge previous karst *** dissolution,precipitant and recrystallization produced by allogenic corrosive fluid introduction and petroleum thermal cracking,caused contraction or enlargement of the subaerial karstification vugs and the development of new secondary vugs during the deep burial and *** ultimate vug of deep burial dolomitite is determined not only by fluid charge,dissolution,mineral precipitant,and petroleum thermal cracking during the deep burial and tectonic uplift,but also by the amount of initial secondary dissolution vugs created by subaerial karstification.

关键词： dolomitite subaerial karstification dissolution precipitant vug

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STUDIES ON PRECIPITATED Cu-BASED CATALYST FOR METHANOL SYNTHESIS IL CATALYST COMPOSITION AND PREPARATION PROCESS

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Journal of Energy Chemistry 1995年第4期 449-458页

作者： GUO Xian-Ji WANG Wen-Xiang LI FanDepartment of Chemistry, Zhengzhou University Zhengzhou. Henan 450052

Several series Cll-based catalysts prepared by one-step parallelflow coprecipitation or tow-step coprecipitation methods were investigated. The results mainly indicate that the optimum Cu/Zn ratio changes withpreparation method. Both the optimum Cu/Zn ratio and the activity of thecatalyst prepared by the former are higher than those of tbe catalyst preparedby the latter. which can be explained by their XRD patterns. When calcinedat high temperature. the catalyst shows very poor activitv. which is discussedin detail. Adding MnOto the catalyst Cu-ZnO-AlO. the thermal stability is improved greatly. while adding CdO, the activity declines.

关键词： Cu-based catalyst methanol synthesis coprecipitation method.Cu/Zn ratio calcining temperature additive precipitant

Fischer-Tropsch Synthesis over Alumina- Supported Cobalt-Based Catalysts: Effect of Support Variables

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Journal of Materials Science and Chemical Engineering 2014年第12期2卷 19-27页

作者： Yan Liu Heqin Guo Litao Jia Zhancheng Ma Yong Xiao Congbiao Chen Ming Xia Bo Hou Debao Li Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan China

Different kinds of aluminum precursors were obtained from precipitating ammonium bicarbonate, ammonium carbonate, and saturated ammonium bicarbonate, then, boehmite (AlO(OH)), ammonium alumina carbonate hydroxide (AACH) and their mixture were obtained, and then, different kinds of alumina were obtained after calcination. Three catalysts supported on the different alumina were obtained via impregnating cobalt and ruthenium by incipient wetness. The effects of different precipitants on composition of precursors were?studied by XRD, FTIR, and TGA. The property and structure of alumina were studied by XRD and BET. The supported catalysts were studied by characterizations of XRD and H2-TPR, and the catalytic performance for Fischer-Tropsch synthesis (FTS) were evaluated at a fix-bed reactor. The relations among the composition of precursors, the property of alumina and the catalytic performance of supported catalysts were researched thoroughly.

关键词： Cobalt-Based Catalysts Fischer-Tropsch Synthesis Alumina precipitant

Application of Supramolecular Strategy to the Removal of Coordinated Metal From Wastewater

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Application of Supramolecular Strategy to the Removal of Coo...