摘要
以粉煤灰基地质聚合物为基本骨架,通过水热合成法将其原位转化为自支撑FAU型沸石分子筛。研究水热过程中NaOH浓度、NaOH体积、水热温度和水热时间对FAU型沸石分子筛结晶程度的影响,得到粉煤灰基地质聚合物原位转化FAU型沸石分子筛型体的适宜条件:水热温度100℃,NaOH浓度2.0 mol/L,NaOH体积50 m L,水热时间18 h。XRD、SEM和FTIR分析表明,所得FAU型分子筛结晶纯度高,具有致密又规则的八面体形貌,基本继承了地质聚合物的主要骨架结构,其抗压强度为18.8 MPa,BET比表面积为175.31 m^2/g。该法工艺简单,环境友好。在此方法的基础上通过改变原料配比和反应条件,可以合成其他类型的沸石分子筛型体。
Self-supporting zeolite FAU was synthesized from fly ash-based geopolymer via in-situ hydrothermal method. The effects of various factors, such as hydrothermal temperature, crystallization time, concentration and volume of sodium hydroxide （NaOH） on the crystallinity of zeolite FAU were investigated. Optimal conditions for the synthesis zeolite FAU from fly ash based geopolymer were determined to be： temperature 100 ℃, curing time, 18 h in the 50 mL of 2.0 mol/L NaOH solution. The optimum zeolite FAU block show an octahedral shape with good crystaUinity and basically inherited the main skeletal structure of geopolymer through XRD, SEM and FYIR analysis. The compress strength of zeolite FAU is 18.8 MPa with specific surface area of 175.31 m2/g. The in-situ hydrothermal method is a facile, environment-friendly method for the preparation of self-supporting zeolite. Moreover, different type of zeolites can be synthesized by controlling the raw material compositions and reaction conditions.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2018年第2期411-417,共7页
Journal of Synthetic Crystals
基金
湖北省地质局2017年科技项目(KJ2017-23)
