Muhammad Arif Ab Aziz , Nur Hidayatul Nazirah Kamarudin , Herma Dina Setiabudi , Halimaton Hamdan , Aishah Abdul Jalil , Sugeng Triwahyono
{"title":"IR和ESR研究证实了Ni对正戊烷异构化过程中PtHY的负面影响","authors":"Muhammad Arif Ab Aziz , Nur Hidayatul Nazirah Kamarudin , Herma Dina Setiabudi , Halimaton Hamdan , Aishah Abdul Jalil , Sugeng Triwahyono","doi":"10.1016/S1003-9953(11)60329-0","DOIUrl":null,"url":null,"abstract":"<div><p>Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni<sup>2+</sup>/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740–3500 cm<sup>−1</sup>. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm<sup>−1</sup> and the sharp band at 3740 cm<sup>−1</sup> with simultaneous development of new absorbance band at 3700 cm<sup>−1</sup> that was attributed to (–OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of <em>n</em>-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.</p></div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 1","pages":"Pages 29-36"},"PeriodicalIF":0.0000,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60329-0","citationCount":"21","resultStr":"{\"title\":\"Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies\",\"authors\":\"Muhammad Arif Ab Aziz , Nur Hidayatul Nazirah Kamarudin , Herma Dina Setiabudi , Halimaton Hamdan , Aishah Abdul Jalil , Sugeng Triwahyono\",\"doi\":\"10.1016/S1003-9953(11)60329-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni<sup>2+</sup>/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740–3500 cm<sup>−1</sup>. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm<sup>−1</sup> and the sharp band at 3740 cm<sup>−1</sup> with simultaneous development of new absorbance band at 3700 cm<sup>−1</sup> that was attributed to (–OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of <em>n</em>-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.</p></div>\",\"PeriodicalId\":56116,\"journal\":{\"name\":\"Journal of Natural Gas Chemistry\",\"volume\":\"21 1\",\"pages\":\"Pages 29-36\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2012-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60329-0\",\"citationCount\":\"21\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Natural Gas Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1003995311603290\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Natural Gas Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1003995311603290","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies
Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2+/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740–3500 cm−1. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm−1 and the sharp band at 3740 cm−1 with simultaneous development of new absorbance band at 3700 cm−1 that was attributed to (–OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.