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《中国化学快报》1992,(9)
The composite ZSM—5 zeolite/vermiculite catalyst,in which tiny ZSM—5 zeolite parti-cles embedded in the vermiculite substrate,has been synthesized by hydrothermal method with vermiculite assilicon source.The catalytic behavior of resulting catalyst for xylene isomerization,propylene aromatizationand toluene disproportionation is better than that of HZSM—5 zeolite. 相似文献
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Introductionltistvellknox`nthath}'drothcrmalcn'stallizationisaconventionaltechniqueforzeoliteandmolccularsicvcs}nthcsls.Watcrassolvcntplaystheroleofminerali.ation[ll.Inl985,BibbyandDalcrcportedfirstl}'thes}'nthcsisofsilica-sodaliteinethyleneglycolsol.e.tl2l.Sincetllcn,man}'kindsofzeolitcst"ercpreparedinnon-aqueoussystemsHott'ever,noinformationonthcinfluenccofsolvcntonzcolitcsynthesishasbecnreported.Inthispapcr,t"crcportanintcrcstingcxamplc.Incascsofnosolventandusingx`atcr,cth}'lcneglycolandc… 相似文献
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In this paper, we investigated the selective cleavage of acyclic acetals with the reagent system, ZrCl_4-LiAlH_4. The results indicate that this system is very useful for the cleavage of acyclic acetals to the corresponding asymmetric ethers. 相似文献
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《中国化学快报》1992,(1)
A new kind of catalyst WOBr_4,which can be used in the polymerization ofphenylacetylene(PhA),has been synthesized.The obtained polyphenyl(?)cetylene(PPhA)using WOBr_4 as catalyst is soluble、fusible、with brown-red colour and has 1831(Mn).The analysis of the stucture of PPhA shows that the polymer has cis-transoidalstructure,therefore,the reaction mechanism is via complex catalysis. 相似文献
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