Seo, G Kim, MW Kim, JH Ahn, BJ Hong, SB Uh, YS 2024-01-21T17:39:55Z 2024-01-21T17:39:55Z 2022-01-10 1998-01 1011-372X https://pubs.kist.re.kr/handle/201004/143401 A pure, highly crystalline clinoptilolite (CLI) zeolite with a Si/Al ratio of 5.8 has been synthesized using a small amount (1%) of seed crystals and tested as a catalyst for the skeletal isomerization of I-butene at 623-723 K at atmospheric pressure. The catalytic results are compared to those obtained from a ferrierite (FER) zeolite with a Si/Al ratio of 7.6. It is found that selectivity for isobutene is very high on CLI zeolite, but conversion was lower than for FER zeolite. The simulated distribution and calculated potential profile of I-butene molecules in CLI zeolite pore 10-ring channels show that the spatial constraints imposed by the pores are very severe. The exceptional selectivity and the low conversion of CLI zeolite results from the strict restriction of adsorption to very specific sites, inhibiting dimerization, as well as from the high potential barrier which reduces mass transfer. English BALTZER SCI PUBL BV TEMPERATURE-PROGRAMMED DESORPTION H-FERRIERITE CATALYST N-BUTENE SELECTIVE ISOMERIZATION ISOBUTENE ISOBUTYLENE ADSORPTION CONVERSION MECHANISM OLEFINS Skeletal isomerization of 1-butene on synthetic clinoptilolite zeolite Article 10.1023/A:1019070526033 1 CATALYSIS LETTERS, v.55, no.2, pp.105 - 112 CATALYSIS LETTERS 55 2 105 112 scie scopus 000076952800009 2-s2.0-0000308498 Chemistry, Physical Chemistry Article TEMPERATURE-PROGRAMMED DESORPTION H-FERRIERITE CATALYST N-BUTENE SELECTIVE ISOMERIZATION ISOBUTENE ISOBUTYLENE ADSORPTION CONVERSION MECHANISM OLEFINS 1-butene skeletal isomerization synthetic clinoptilolite carbonaceous deposits spatial constraints