结晶
苯
石墨烯
成核
ZSM-5型
沸石
烷基化
化学工程
拉曼光谱
氧化物
催化作用
材料科学
选择性
甲苯
Crystal(编程语言)
热液循环
X射线光电子能谱
化学
纳米技术
有机化学
程序设计语言
工程类
物理
光学
计算机科学
作者
Xiangyou Kong,Pengfei Nie,Lei Shi,Maocong Hu,Pingping Zhang,Xia Li,Zhiyi Wang,Xuguang Liu
标识
DOI:10.1016/j.cej.2021.131598
摘要
Fast synthesis of zeolite with hydrothermal method is a challengeable topic. In this work, we reduced the crystallization time to ~1/3 of conventional method by adding a small amount of graphene oxide (GO) into ZSM-11 synthesis gel. The embedment of GO into ZSM-11 crystal was confirmed by XPS, TG, and Raman spectra, while it modified morphology, porosities, component, and surface acidity of ZSM-11 as characterized by SEM, TEM, XRF, N2-physisorbtion, NH3-TPD, and Py-IR. The non-classical nucleation, which governed the required crystallization time, was further proposed and evidenced by both experimental observations and molecular dynamic modeling. It clearly illustrated the positive role of GO on promoting the formation of meta-stable phase during non-classic nucleation, resulting into much shorter crystallization time. GO embedded ZSM-11 demonstrated high activity (reaction rate and TOF), improved selectivity, and superior stability for benzene alkylation with ethanol, which can be attributed to the regulated surface acidity and diffusion properties. This work opens up a new perspective to synthesize ZSM-11 zeolite with superior catalytic performance in a highly efficient and environmental manner.
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