Isomerization of n-butene over pre-coked HZSM-5 and HFER
To elucidate the role of carbonaceous deposits for enhancing the selectivity of zeolite catalysts during n-butene skeletal isomerization, HFER and HZSM-5 were modified by precoking and silanization. After surface modification, the samples have been characterized by nitrogen and xenon sorption measurements as well as 129Xe NMR spectroscopy. The nature of carbonaceous deposits formed during the pre-coking treatment was investigated by MALDITOF mass spectrometry. For mechanistic studies, 14C-labeled olefins were added to the n-butene feed. The formation of an olefinic pool is proposed, i.e., isobutene selectivity is controlled by zeolite properties as well as thermodynamic conditions.
F. Bauer E. Bilz W. H. Chen A. Freyer V. Sauerland S. B. Liu
Leibniz-Institut fur Oberflachenmodifizierung, Permoserstr. 15, D-04318 Leipzig, Germany Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei, 106 Bruker Daltonik GmbH, Fahrenheitstr. 4, D-28359 Bremen, Germany
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）