Simple and rapid synthesis of zeolite W from K-feldspar via the improved hydrothermal method

IF 1.4 4区 工程技术 Q3 ENGINEERING, CHEMICAL Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-04-22 DOI:10.1002/apj.3078
Zixuan Zhao, Kai Yang, Yun Li, Jilin Cao
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Abstract

An improved hydrothermal method was proposed to rapidly synthesize zeolite W from alkali fusion-activated K-feldspar. The effects of m (KOH)/m (K-feldspar), n (SiO2)/n (Al2O3), n (H2O)/n (SiO2), crystallization time, and crystallization temperature on the synthesis of the zeolite W were investigated. The optimal synthesis conditions were m (KOH)/m (K-feldspar) ratio of 1.5:1, the activation time of 2 h, and the activation temperature of 500°C, n (H2O)/n (SiO2) ratios of 42, n (K2O)/n (SiO2) of 0.90, n (SiO2)/n (Al2O3) of 5, crystallization time of 6 h, and crystallization temperature of 150°C. The mechanism for rapid synthesis of zeolite W was illustrated. In this process, Na2SiO3·9H2O and Al2(SO4)3·18H2O were first dissolved rapidly in the synthesis system to form an amorphous gel, which contributes to the accelerated crystallization process. Compared with the state-of-the-art synthesis method, this method remarkably decreases the water content to be added in the synthesis process and crystallization time, avoids the pre-preparation process of the xerogel, and enhances the utilization rate of K-feldspar. This work provides an industrial-friendly synthesis process of zeolite W and could realize the highly efficient utilization of K-feldspar.

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通过改进的水热法从 K 长石中简单快速地合成沸石 W
提出了一种改进的水热法,可利用碱熔活化的 K 长石快速合成沸石 W。研究了m(KOH)/m(K-长石)、n(SiO2)/n(Al2O3)、n(H2O)/n(SiO2)、结晶时间和结晶温度对沸石W合成的影响。最佳合成条件为m(KOH)/m(K-长石)比为1.5:1,活化时间为2 h,活化温度为500℃,n(H2O)/n(SiO2)比为42,n(K2O)/n(SiO2)比为0.90,n(SiO2)/n(Al2O3)比为5,结晶时间为6 h,结晶温度为150℃。说明了快速合成沸石 W 的机理。在这一过程中,Na2SiO3-9H2O 和 Al2(SO4)3-18H2O 首先在合成体系中快速溶解,形成无定形凝胶,这有助于加速结晶过程。与最先进的合成方法相比,该方法大大减少了合成过程中的加水量和结晶时间,避免了异凝胶的预制备过程,提高了钾长石的利用率。这项工作提供了一种工业友好型沸石 W 合成工艺,可实现钾长石的高效利用。
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来源期刊
自引率
11.10%
发文量
111
期刊介绍: Asia-Pacific Journal of Chemical Engineering is aimed at capturing current developments and initiatives in chemical engineering related and specialised areas. Publishing six issues each year, the journal showcases innovative technological developments, providing an opportunity for technology transfer and collaboration. Asia-Pacific Journal of Chemical Engineering will focus particular attention on the key areas of: Process Application (separation, polymer, catalysis, nanotechnology, electrochemistry, nuclear technology); Energy and Environmental Technology (materials for energy storage and conversion, coal gasification, gas liquefaction, air pollution control, water treatment, waste utilization and management, nuclear waste remediation); and Biochemical Engineering (including targeted drug delivery applications).
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