摘要
使用白炭黑和水玻璃作为硅源、Silicate-1纳米微晶作为晶核、四丙基溴化铵(TPABr)作为结构导向剂,合成了具有多元孔道的纳米ZSM-5聚集体,其中晶体和颗粒尺寸的可调范围分别为30~300nm和400nm~1.2µm。根据表征结果推测得出纳米ZSM-5团聚体形成过程中Silicate-1和TPABr之间存在协同效应,碱性环境下晶种表面具有丰富的负电荷,部分TPA+会吸附在晶种表面以补偿表面负电荷。由此,TPABr诱导形成的晶体可以围绕晶种表面迅速生长,从而形成纳米团聚体。在此过程中,晶体和颗粒的尺寸可以分别通过控制TPABr和晶种含量来灵活调节。该合成纳米ZSM-5聚集体的方法具有灵活、方便的特点,适用于大规模工业化生产。
Nanosized ZSM-5 aggregates with multiple channels were synthesized using silica and water glass as silicon sources,silicate-1 nanocrystals as crystal nuclei,and tetrapropylammonium bromide(TPABr)as structural directing agents.The adjustable ranges of crystal and particle sizes were 30~300 nm and 400 nm~1.2μm,respectively.Based on the characterization results,it was speculated that there was a synergistic effect between Silicate-1 and TPABr during the formation of nanoscale ZSM-5 aggregates.Under alkaline conditions,the surface of the crystal seeds had abundant negative charges,and some TPA+would adsorb on the surface of the crystal seeds to compensate for surface negative charges.Therefore,crystals induced by TPABr could rapidly grow around the surface of the seed,resulting in the formation of nano aggregates.During this process,the size of crystals and particles could be flexibly adjusted by controlling TPABr and seed content separately.This method of synthesizing nanoscale ZSM-5 aggregates had the characteristics of flexibility and convenience,and was suitable for largescale industrial production.
作者
米晓彤
李孝国
常洋
张永坤
李永恒
曹辉
侯章贵
MI Xiaotong;LI Xiaoguo;CHANG Yang;ZHANG Yongkun;LI Yongheng;CAO Hui;HOU Zhanggui(CNOOC Institute of Chemical&Advanced Materials(Beijing)Co.,Ltd.,Beijing 102200)
出处
《无机盐工业》
CAS
CSCD
北大核心
2023年第6期130-135,共6页
Inorganic Chemicals Industry
关键词
晶种
ZSM-5
协同作用
多元孔道
纳米团聚体
seed
ZSM-5
synergistic effect
multivariate channels
nanosized aggregates
