Direct synthesis of mesoporous aluminosilicate using natural clay from low-grade potash ores of a salt lake in Qinghai, China, and its use in octadecylamine adsorption

Sun, Chunyan; Zhang, Feng; Wang, Aili; Li, Shengfang; Cheng, Fangqin

doi:10.1016/j.clay.2015.02.007

Cited by 14 publications

(5 citation statements)

References 30 publications

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“…The FTIR spectrum of 30 %AMP/Al-MCM-41 is shown in Figure 2 (a). For comparison, the spectrum of blank Al-MCM-41, which was prepared under similar conditions to those for AMP/Al-MCM-41 without the addition of AMP, [30] is presented in Figure 2 [14a,14c,14d] and indirectly proves that there are interactions between the silicon species and the AMP in the framework. Consequently, the Keggin unit could only be characterized by the bands of stretching modes assigned to bridging bonds.…”

Section: Characterization Of the Samplesmentioning

confidence: 99%

Facile Preparation of Ammonium Molybdophosphate/Al‐MCM‐41 Composite Material from Natural Clay and Its Use in Cesium Ion Adsorption

et al. 2015

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Ordered hexagonal mesoporous aluminosilicate matrix (Al-MCM-41) with incorporated ammonium molybdophosphate (AMP) was successfully synthesized by a one-pot synthesis method with natural clay from low-grade potash ores of Qinghai salt lake as the silica and aluminum source. We introduced a modified "liquid-phase transport" step, which allowed the use of impure natural clay as a starting material to directly produce pure product without sedimentation pretreatment. The resultant product was characterized by X-ray fluorescence (XRF) spectroscopy, FTIR spectroscopy, XRD,

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Section: Characterization Of the Samplesmentioning

confidence: 99%

Facile Preparation of Ammonium Molybdophosphate/Al‐MCM‐41 Composite Material from Natural Clay and Its Use in Cesium Ion Adsorption

et al. 2015

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“…Recently, the direct synthesis of characteristic zeolites (including ZSM-5, USY, and TES-10) using traditional chemical Si/Al sources by the hydrothermal method has been reported. However, previously reported clays were destructively activated by strong acid, high temperature (>1073 K), or alkali melting to extract the Si and/or Al sources where the crystal of the clay is no longer present in the reported recipe. − In the work, the “direct synthesis” highlights that the clay (ATP) does not require deep activation before the crystallization process, which is directly used with its pristine crystal structure. Corresponding to direct synthesis, the “indirect synthesis” means that the clays were destructively activated before the crystallization process in order to obtain the effective ingredients.…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Zeolites from a Natural Clay, Attapulgite

Jiang

Liu

et al. 2017

ACS Sustainable Chem. Eng.

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Presently, chemical Si/Al sources are predominantly used as raw materials for the synthesis of zeolites in spite of their high cost. Here, we report for the first time the direct synthesis of a ZSM-5 zeolite by using a natural clay, attapulgite (ATP), as the lowcost and environmentally benign Si/Al source through a vaporinduced transformation (VIT) method, in which the vapor diffuses into ATP and interacts with the framework. In a crystallization recipe, ATP is well present with a pristine crystal structure, and the yield of zeolite reaches 96%. The resultant zeolite exhibits welldefined crystallinity and porosity, which are comparable to the counterpart synthesized from traditional chemical Si/Al sources. In the synthetic process, the formation of Si−F species plays an important role, which promotes the transformation of an ATP crystal to a zeolite crystal. Meanwhile, the metal elements (e.g., Al, Fe, and Mg) of ATP exist in the zeolite products, and at least part of them are located in the zeolite framework, which endows the zeolite with excellent catalytic activity. Direct synthesis of various zeolite crystals including TON, MOR, and *BEA from ATP is also realized via the VIT method. Our work provides a green and economic alternative for the synthesis of zeolites using natural clays instead of chemical raw materials.

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“…Therefore, mesoporous aluminosilicate which has high surface area, thermal stability and selectivity, and a large cation exchange capacity is frequently used for acetalization [3]. Generally, aluminosilicate synthesized from chemical reagents is relatively expensive and toxic like TMOS (tetramethyl orthosilicate), TEOS (tetraethyl orthosilicate), and sodium aluminate [4][5][6][7]. Recently, many researchers used natural mineral kaolinite which is naturally available as raw material/precursor in aluminosilicate synthesis [5,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis Strategy of Hierarchical Alumiosilicates from Low Grade Indonesian Kaolin with Adjusted Activity in Acetalization Reaction

Hartati

Tjahjandarie

Purwaningsih

et al. 2020

KEM

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Synthesis strategy of hierarchical aluminosilicates was carried out by varying the starting material, type of a basic solution, and the hydrothermal condition. Aluminosilicate was synthesized using pre-treated low-quality kaolin by three kinds of basic solution, such as sodium hydroxide, sodium fluoride, and tetrapropyl ammonium hydroxide. The hydrothermal condition was carried out by gradual temperature and constant temperature. The desired mole ratio of Si/Al achieved by dealumination or by addition of silica. Products were characterized by X-ray diffraction, FTIR spectrometry, and nitrogen physisorption. Cation exchange was carried out on the product to obtain an acid catalyst. The acidity test of the catalyst was carried out by FTIR-pyridine spectrometry. The catalyst activity test was carried out to the acetalization reaction of 3,4-dimethoxybenzaldehyde with propylene glycol. The results showed that the catalyst synthesized with the basic solution of tetrapropyl ammonium hydroxide had the highest acid site number and the highest conversion of 3,4-dimethoxybenzaldehyde to acetal.

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Direct synthesis of mesoporous aluminosilicate using natural clay from low-grade potash ores of a salt lake in Qinghai, China, and its use in octadecylamine adsorption

Cited by 14 publications

References 30 publications

Facile Preparation of Ammonium Molybdophosphate/Al‐MCM‐41 Composite Material from Natural Clay and Its Use in Cesium Ion Adsorption

Facile Preparation of Ammonium Molybdophosphate/Al‐MCM‐41 Composite Material from Natural Clay and Its Use in Cesium Ion Adsorption

Direct Synthesis of Zeolites from a Natural Clay, Attapulgite

Synthesis Strategy of Hierarchical Alumiosilicates from Low Grade Indonesian Kaolin with Adjusted Activity in Acetalization Reaction

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