Reactivity of Solids最新文献_第3页

Decomposition of Cd(CH3COO)2 · 2H2O and creation of reactive solid surfaces - a spectrothermal investigation Cd(CH3COO)2·2H2O的分解和反应性固体表面的生成-光谱热研究

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80020-K

Seham A.A. Mansour, Gamal A.M. Hussein, Mohamed I. Zaki

{"title":"Decomposition of Cd(CH3COO)2 · 2H2O and creation of reactive solid surfaces - a spectrothermal investigation","authors":"Seham A.A. Mansour, Gamal A.M. Hussein, Mohamed I. Zaki","doi":"10.1016/0168-7336(90)80020-K","DOIUrl":"10.1016/0168-7336(90)80020-K","url":null,"abstract":"<div>The thermal decomposition course of cadmium acetate dihydrate (CdAc) was examined, on heating to 773 K at various rates (5–30 K min−1) by thermogravimetric and differential thermal analyses, and temperature shifts experienced by the events encountered as a function of the heating rate were employed in determining corresponding non-isothermal kinetic parameters (k, A and ΔE). Gas- and solid-phase products were identified by infrared spectroscopy and X-ray diffractometry. The results obtained showed CdAc to dehydrate at 360–423 K, and then decompose at 508–560 K giving CdO, and (CH3)CO and CO2 into the gas phase, encompassing two melting processes at 345 and 500 K. Other gas-phase products of CH3COOH, CO, CH4 and (CH3)2CHCH2 were also detected, however in minor proportions, and ascribed to reactions occurring at the gas-solid interface at the expense of some of the initial products. These results were found in good agreement with the results of previous investigations of metal acetates.</div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"8 1","pages":"Pages 197-208"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(90)80020-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73674074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Tribochemical reaction between Na-FAU and AlPO4 · 3H2O Na-FAU与AlPO4·3H2O的摩擦化学反应

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80014-B

Jose Fernández-Bertran, Rolando Roque Malherbe

引用次数: 3

The application of variable atmosphere thermomagnetometry to the thermal decomposition of pyrite 变大气热磁法在黄铁矿热分解中的应用

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80016-D

H.J. Hurst, J.H. Levy, S.St.J. Warne

引用次数: 12

Tin recovery from liquid slag by reduction with pig iron 生铁还原法回收液渣中的锡

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80003-3

K.A. El Barawy, A. Warczok

引用次数: 0

Control of litharge-massicot transformation by doping and mechanical activation 掺杂和机械活化控制锂离子-马塞柯相变

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80005-5

Tetsuhiko Isobe, Mamoru Senna★

引用次数: 2

Kinetics and mechanism of the solid-state reaction between p-substituted anilines and p-benzoquinone 对取代苯胺与对苯醌固相反应动力学及机理

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80013-A

N.B. Singh, R.J. Singh

{"title":"Kinetics and mechanism of the solid-state reaction between p-substituted anilines and p-benzoquinone","authors":"N.B. Singh, R.J. Singh","doi":"10.1016/0168-7336(90)80013-A","DOIUrl":"10.1016/0168-7336(90)80013-A","url":null,"abstract":"<div>Reactions of the p-substituted anilines p-anisidine (I), p-bromoaniline (II) and p-chloroaniline (III) with p-benzoquinone have been studied in the solid state. The reaction products are 1:1 molecular complexes which may be polymeric or agglomeric in nature. DSC studies revealed that the products obtained from solution and by solid-state reactions are not identical in the systems of I and III, whereas in system II they are identical. However, when the reaction products of system I and III obtained from solution are heated at 150°C, the entrapped solvent molecules become liberated and the products obtained from solution and solid-state reactions become identical. Spectroscopic studies show that the reaction products are charge-transfer complexes stabilized by hydrogen bonding. ESR spectroscopic studies confirm the presence of unpaired electrons in the complexes. Electrical conductivity measurements of solid pellets proved that the reaction products have semiconducting properties.In the course of the reactions it was found that the p-benzoquinone molecules diffuse towards the p-substituted anilines, forming brown-coloured reaction products. Diffusion occurs through surface migration, which is related to the geometry of the molecules. The higher the dipole moment of the p-substituted anilines, the lower the rate of the reaction. Also, the higher the dissociation constants of the p-substituted anilines, the higher the rate of the reaction. The rate of the reactions have confirmed the validity of the Hammett equation. This equation has been verified for the first time for organic solid-state reactions.</div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"8 1","pages":"Pages 115-140"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(90)80013-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81647116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

On the application of the crackling core model to the reduction of magnetite to wustite 裂纹核模型在磁铁矿还原为浮士体中的应用

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80012-9

J. Janowski, A. Barański, M. Łagan, J. Nedoma, A. Sadowski

引用次数: 3

Thermal and spectroscopic characterization of reaction products of Al-nitrate-Cr-carbonate interaction at different temperatures 硝酸铝-碳酸铬反应产物在不同温度下的热光谱表征

Reactivity of Solids Pub Date : 1990-06-01 DOI: 10.1016/0168-7336(90)80004-4

M.F.R. Fouda★ , R.S. Amin , M.M. Selim

{"title":"Thermal and spectroscopic characterization of reaction products of Al-nitrate-Cr-carbonate interaction at different temperatures","authors":"M.F.R. Fouda★ , R.S. Amin , M.M. Selim","doi":"10.1016/0168-7336(90)80004-4","DOIUrl":"10.1016/0168-7336(90)80004-4","url":null,"abstract":"<div>The chemical interaction at 250 to 1000°C of aluminium nitrate with chromium carbonate was investigated. The decomposition products of these compounds, and their mixtures with molar ratios of <math><mtext>3</mtext><mtext>1</mtext></math>, <math><mtext>2</mtext><mtext>1</mtext></math>, <math><mtext>1</mtext><mtext>1</mtext></math>,<math><mtext>1</mtext><mtext>2</mtext></math>and <math><mtext>1</mtext><mtext>3</mtext></math>, were characterized by means of chemical analysis, diffuse reflectance and X-ray diffraction.At temperatures higher than 215°C mixtures with a chromium carbonate/aluminium nitrate ratio greater than one yielded an amorphous aluminium chromate dichromate with an empirical formula Al2−x-CrxO3Al2(CrO4)2Cr2O7together with crystalline Cr2O3. Mixtures with a ratio equal to or less than one yielded an amorphous aluminium hydroxy chromate (empirically, AlCrO3Al(OH)CrO4) with Cr2O3 and γ-alumina.Both types of chromates were converted into solid solutions of (Al0.17Cr0.83)2O3, (Al0.25Cr0.75)2O3, (Al0.33Cr0.67)2O3 and (Al0.5Cr0.5)2O3 at temperatures higher than 480°C. Characteristic phenomena of (Al1−xCrx)2O3 solid solutions were observed, such as their d spacings and shifts of 4A2g → 4T2g and 4T2g → 4T1g absorption bands towards shorter wavelengths.</div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"8 1","pages":"Pages 21-28"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(90)80004-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85272422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A model study of carbiding of polycrystalline iron films by carbon monoxide 一氧化碳对多晶铁膜碳化的模型研究

Reactivity of Solids Pub Date : 1989-11-01 DOI: 10.1016/0168-7336(89)80055-5

R. Dziembaj, W. Makowski, G. Wedler, A. Schmidt, H. Landes

引用次数: 2

The role of water in the low-temperature hydrogen reduction of hematite into iron, and the role of the surface oxygen chemical potential in double reactions 水在低温氢还原赤铁矿成铁中的作用，以及表面氧化学势在双重反应中的作用

Reactivity of Solids Pub Date : 1989-11-01 DOI: 10.1016/0168-7336(89)80059-2

F. Adam, B. Dupré, C. Gleitzer

{"title":"The role of water in the low-temperature hydrogen reduction of hematite into iron, and the role of the surface oxygen chemical potential in double reactions","authors":"F. Adam, B. Dupré, C. Gleitzer","doi":"10.1016/0168-7336(89)80059-2","DOIUrl":"10.1016/0168-7336(89)80059-2","url":null,"abstract":"<div>The striking role played by water vapour during the low temperature reduction of hematite into magnetite by carbon monoxide has been reported but the possibility that this effect was not due to hydrogen produced from the H2O+CO shift reaction had to be eliminated.A very similar effect by water vapour during the reaction of hematite with hydrogen is reported, the nucleation of magnetite is more regularly distributed and the magnetite layer is much more regular, but the rate of reaction is lower.As the reduction proceeds to give more iron, another striking effect is observed: in the presence of water, there is no overlap of the steps hematite → magnetite and magnetite → iron; the reduction of magnetite starts once the hematite has disappeared. It is shown that rather than being a problem of transfer through a stagnant film, the clearly different steps may be attributed to the fact that when adsorption-desorption is not fast enough, the surface oxygen chemical potential differs from that of the gas.</div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 383-397"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80059-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73633759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4