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H. G. Zeuthen 《Mathematische Annalen》1874,8(1):1-30
Sans résuméDie diesen Aufsatz begleitende Figur findet man am Ende des Aufsatzes. 相似文献
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H. G. Zeuthen 《Mathematische Annalen》1916,77(2):308-312
Ohne Zusammenfassung 相似文献
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H. G. Zeuthen 《Mathematische Annalen》1869,1(3):432-454
Sans résumé 相似文献
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Vasina T. V. Masloboishchikova O. V. Khelkovskaya-Sergeeva E. G. Kustov L. M. Zeuthen P. 《Russian Chemical Bulletin》2002,51(2):255-258
The activity of monometallic Rh and Pt catalysts and bimetallic Pt—Rh catalysts on oxide supports in cyclohexane ring opening to form n-hexane was studied. The Rh-containing catalysts are highly active and selective in this reaction. Cyclohexane dehydrogenation predominates in the case of the Pt catalysts. The use of the bimetallic alumina-supported Pt—Rh catalysts allows one to minimize the contribution of cyclohexane cracking and to enhance the selectivity for n-hexane with the yield of the latter slightly depending on the metal ratio in the bimetallic system under the experimental conditions. 相似文献
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T. V. Vasina O. V. Masloboishchikova E. G. Khelkovskaya-Sergeeva L. M. Kustov P. Zeuthen 《Russian Chemical Bulletin》1999,48(7):1270-1273
Isomerization ofn-butane on various types of zeolites (ZVM, ZVK, mordenite, and Y) modified with transition metals and cationic and anionic
additives was investigated. Under the conditions studied, H-forms of zeolites are inactive. Pt-containing systems based on
the H-form of ZVM (HZVM) are the most efficient catalysts forn-butane isomerization, and the yield of isobutane reaches 20–26 wt.% at a selectivity of 40–45%. Modification of this catalyst
with Ga and Fe compounds or with an aqueous solution of HCl increases the selectivity with respect to isobutane up to 70–90%.
Introduction of Zn2+ cations or F− and SO4
2− anions into the Pt-containing HZVM system decreases the selectivity and yield of isobutane due to the formation of very strong
acidic centers on which disproportionation and hydrocracking ofn-butane mainly occur.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1281–1285, July, 1999. 相似文献
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