title: Synthesis of Silicate Zeolite Analogues Using Organic Sulfonium Compounds as Structure-Directing Agents.
abstract: A microporous crystalline silica zeolite of the MEL structure type and three other zeolite analogues composed of germanosilicate frameworks were synthesized using tributylsulfonium, triphenylsulfonium, or tri(para-tolyl)sulfonium as the structure-directing agent. The germanosilicates thus obtained had ISV, ITT, or a new zeolite structure depending on the synthesis conditions. The structure of the new germanosilicate was solved using X-ray powder diffraction data with the aid of a charge-flipping method. The solution indicated a crystal structure belonging to the P63/mmc space group with cell parameters of a=16.2003 Å and c=21.8579 Å. After calcination, the new germanosilicate material exhibited two types of accessible micropores with diameters of 0.61 and 0.78 nm.
authors: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701 (Korea).
authors: Changbum
authors: C
authors: Jo
authors: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701 (Korea).|Department of Chemistry, KAIST, Daejeon 305-701 (Korea).
authors: Sungjune
authors: S
authors: Lee
authors: Department of Applied Chemical Engineering, Chonnam National University, Gwangju 500-207 (Korea).
authors: Sung June
authors: SJ
authors: Cho
authors: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701 (Korea). rryoo@kaist.ac.kr.|Department of Chemistry, KAIST, Daejeon 305-701 (Korea). rryoo@kaist.ac.kr.
authors: Ryong
authors: R
authors: Ryoo
keywords: germanium; porosity; structure-directing agents; zeolite analogues; zeolites