摘要
研究以徐州地区煤系高岭土为原料、NaOH溶液为浸取液,先于550℃煅烧2h得到偏高岭土,再在全密封反应釜中通过偏高岭土和NaOH溶液(固液质量比1∶20)之间的水热反应制备4A沸石分子筛[Na12(Al12Si12O48)·27H2O]。并采用X射线衍射仪(XRD)、傅里叶转换红外光谱仪(FT-IR)、扫描电子显微镜(SEM)和N2吸附脱附等测试手段对4A沸石分子筛进行表征。结果表明,煤系高岭土经550℃煅烧2h后转变成无定形态的偏高岭土,碱浸取后变成4A沸石分子筛;合成4A沸石分子筛过程中NaOH溶液的最佳浓度是2mol/L;4A沸石分子筛具有狭缝状孔道,但孔的形状和分布不均匀。
The 4A zeolite molecular sieve [Na12（Al12Si12O48）·27H2O] was synthesized in a sealed Teflon lined autoclave by hydrothermal reaction of NaOH solution and metakaolinite （the mass ratio of solid/liquid is 1 ： 20） prepared by calcined coal-measure kaolin from Xuzhou at 550℃ for 2h. 4A zeolite molecular sieve was characterized by X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FT-IR）, scanning electron microscopy （SEM） and N2 adsorption and desorption isotherm plot methods. The results indicated that amorphous anhydrous metakaolinite was obtained by calcination of kaolin at 550℃ for 2h; it was transformed to 4A zeolite molecular sieve by alkali leaching; the best concentration of NaOH solution was 2mol/L; the pore channel of 4A zeolite molecular sieve was long and narrow, but its shape and size were not uniform.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2009年第1期130-134,共5页
Chemical Industry and Engineering Progress
基金
江苏省科技厅社会发展计划项目(BS2007038)。
关键词
煤系高岭土
4A沸石分子筛
水热合成
coal-measure kaolin
4A zeolite molecular sieve
hydrothermal synthesis
