P. Papaiacovou, H.J. Grabke, M. Danielewski, H.P. Schmidt
{"title":"锰铬尖晶石在H2-H2O-H2S气氛下转化为硫化物","authors":"P. Papaiacovou, H.J. Grabke, M. Danielewski, H.P. Schmidt","doi":"10.1016/0168-7336(90)80015-C","DOIUrl":null,"url":null,"abstract":"<div><p>The conversion of MnCr<sub>2</sub>O<sub>4</sub> to sulphides was investigated at 1073 K, 1173 K and 1273 K in H<sub>2</sub>-H<sub>2</sub>O-H<sub>2</sub>S mixtures. From thermogravimetric studies on the sulphidation of the bulk spinel, the stability limit of MnCr<sub>2</sub>O<sub>4</sub> was determined. When a certain sulphur pressure is exceeded corresponding to the reaction MnCr<sub>2</sub>O<sub>4</sub> + 3/2S<sub>2</sub> = MnS + 2CrS + 2O<sub>2</sub>, the spinel is converted to a porous layer of mixed sulphides (Mn,Cr)S and (Cr,Mn)S. The partial pressure dependences indicate that the reaction rate is controlled by a surface reaction, i.e. the sulphur transfer from H<sub>2</sub>S at the interface sulphide-spinel which is easily accessible through the large pores in the sulphide layer. Similar kinetics and morphology of the reaction products were observed when MnCr<sub>2</sub>O<sub>4</sub> layers obtained by preoxidation of Fe-Cr-Mn alloys were sulphidized. The results provide information on the stability of oxide layers formed on Mn-containing high temperature alloys in oxidizing-sulphidizing atmospheres.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"8 1","pages":"Pages 147-158"},"PeriodicalIF":0.0000,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(90)80015-C","citationCount":"2","resultStr":"{\"title\":\"Conversion of manganese-chromium spinel to sulphides in H2-H2O-H2S atmospheres\",\"authors\":\"P. Papaiacovou, H.J. Grabke, M. Danielewski, H.P. Schmidt\",\"doi\":\"10.1016/0168-7336(90)80015-C\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The conversion of MnCr<sub>2</sub>O<sub>4</sub> to sulphides was investigated at 1073 K, 1173 K and 1273 K in H<sub>2</sub>-H<sub>2</sub>O-H<sub>2</sub>S mixtures. From thermogravimetric studies on the sulphidation of the bulk spinel, the stability limit of MnCr<sub>2</sub>O<sub>4</sub> was determined. When a certain sulphur pressure is exceeded corresponding to the reaction MnCr<sub>2</sub>O<sub>4</sub> + 3/2S<sub>2</sub> = MnS + 2CrS + 2O<sub>2</sub>, the spinel is converted to a porous layer of mixed sulphides (Mn,Cr)S and (Cr,Mn)S. The partial pressure dependences indicate that the reaction rate is controlled by a surface reaction, i.e. the sulphur transfer from H<sub>2</sub>S at the interface sulphide-spinel which is easily accessible through the large pores in the sulphide layer. Similar kinetics and morphology of the reaction products were observed when MnCr<sub>2</sub>O<sub>4</sub> layers obtained by preoxidation of Fe-Cr-Mn alloys were sulphidized. The results provide information on the stability of oxide layers formed on Mn-containing high temperature alloys in oxidizing-sulphidizing atmospheres.</p></div>\",\"PeriodicalId\":101061,\"journal\":{\"name\":\"Reactivity of Solids\",\"volume\":\"8 1\",\"pages\":\"Pages 147-158\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1990-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0168-7336(90)80015-C\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Reactivity of Solids\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/016873369080015C\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reactivity of Solids","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/016873369080015C","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Conversion of manganese-chromium spinel to sulphides in H2-H2O-H2S atmospheres
The conversion of MnCr2O4 to sulphides was investigated at 1073 K, 1173 K and 1273 K in H2-H2O-H2S mixtures. From thermogravimetric studies on the sulphidation of the bulk spinel, the stability limit of MnCr2O4 was determined. When a certain sulphur pressure is exceeded corresponding to the reaction MnCr2O4 + 3/2S2 = MnS + 2CrS + 2O2, the spinel is converted to a porous layer of mixed sulphides (Mn,Cr)S and (Cr,Mn)S. The partial pressure dependences indicate that the reaction rate is controlled by a surface reaction, i.e. the sulphur transfer from H2S at the interface sulphide-spinel which is easily accessible through the large pores in the sulphide layer. Similar kinetics and morphology of the reaction products were observed when MnCr2O4 layers obtained by preoxidation of Fe-Cr-Mn alloys were sulphidized. The results provide information on the stability of oxide layers formed on Mn-containing high temperature alloys in oxidizing-sulphidizing atmospheres.
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