Zeolitic germanosilicate analogue to pharmacosiderite crystallized in an acidic medium

作     者：Guangying Fu Qiaolin Lang Xiaolong Liu Haonuan Zhao Yiqing Sun Lei Zhao Ahmed Omran Peng Lu Xiaobo Yang Bing Yu Valentin Valtchev 

作者机构：The ZeoMat GroupQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of ScienceLaoshan District266101 QingdaoChina College of Chemistry and Chemical EngineeringQingdao University266071 QingdaoChina Normandie UniversityENSICAENUNICAENCNRSLaboratoire Catalyse et SpectrochimieF-14000 CaenFrance 

出 版 物：《Green Carbon》 (绿碳（英文）)

年 卷 期：2023年第1卷第2期

页      面：185-192页

学科分类：0401[教育学-教育学] 04[教育学] 

基　　金：support provided by the Shandong Energy Institute(SEI S202107) Nature Science Foundation of Shandong Province(ZR2022MB053 and ZR2022QB216) 

主　　题：Zeolite synthesis in acidic medium New germanosilicate zeolite 4-connected analogue of pharmacosiderite Structure analysis Structure-directing agents 

摘      要：Zeolites are typically synthesized in alkaline or fluoride-containing near-neutral *** organic structure-directing agents have been investigated for such systems with the aim of discovering materials with unprecedented structures and properties for novel technical *** contrast,zeolite crystallization in strongly acidic media has yet to be *** study demonstrates that a zeolitic silicate phase crystallizes from acidic gels using trimethylamine as an organic additive with the composition 1 SiO_(2):0.3 TMA:0.3 HCl:0.15 HF:55 H_(2)O:(0.1-0.4)GeO_(2).This phase has an interrupted four-connected framework analog to the octahedron/tetrahedron-mixed framework of the mineral family *** comparison to the pharmacosiderite-type HK_(3)(Ge_(7)O_(16))(H_(2)O)_(4),the four GeO_(6)-octahedra forming the central[HGe_(4)O_(4)O_(12)]-cluster are replaced by four SiO_(4)-tetrahedra in a[Si_(4)O_(6)(OH)2.89]-unit in the new ***,the structure is distorted and may contain connectivity and point defects;thus,healing by the occasional incorporation of GeO_(6)-units is *** refined unit cell has a cubic symmetry,space group P-43m(#215),with a=7.7005(1)Å.Acidic-medium synthesis is a useful way to find new zeolites that move in a fundamentally different direction from sophisticated organic structure-directing agents.