Sustainable Route for Synthesis of All-Silica SOD Zeolite

Zhai, Hang-Ling; Bian, Chaoqun; Yu, Yuxia; Zhu, Longfeng; Guo, Lingfeng; Wang, Xiao; Yu, Qinqin; Zhu, Jin; Cao, Xuebo

doi:10.3390/cryst9070338

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…The starting material, Si-SOD, was prepared according to a previously reported solvent-free synthesis method with a molar composition of SiO 2 /Na 2 SiO 3 •9H 2 O/ EG= 1.00:0.07:1.66. 47 The solid silica gel and sodium metasilicate nonahydrate were homogeneously mixed by grinding under dry room temperature, and then ethylene glycol was added and continuously ground for 10 min until a viscous solid was formed. Subsequently, the viscous solid was transferred to the autoclave and sealed well.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Fluoride- and Seed-Free Synthesis of Pure-Silica Zeolite Adsorbent and Matrix Using OSDA-Mismatch Approach

Ma,

Liu,

Hong

et al. 2023

J. Am. Chem. Soc.

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The pure-silica zeolite plays a crucially important role in the gas separation of alkane/alkene, the low-k dielectric material, and the robust matrix for confining metal species during catalysis. However, the environmentally friendly synthesis of puresilica zeolites is still challenging since (1) the toxic fluoride or dealuminum seeds are inevitably utilized through the hydrothermal synthesis and (2) it will also take a longer crystallization time. Herein, we present an efficient method called the OSDA-mismatch approach for the fluoride-and seed-free synthesis of pure-silica zeolites using Si-SOD (enriched 4-rings) as the sole silica source. This approach allows for the rapid and green synthesis of 15 puresilica zeolites (CHA, *BEA, EUO, SFF, STF, -SVR, *-SVY, DOH, MTN, NON, *MRE, MEL, MFI, MTW, and *STO). Furthermore, distinct crystallization mechanisms of two significant pure-silica CHA-and *BEA-type zeolites (denoted as Si-CHA and Si-BEA) are investigated in detail by advanced characterization techniques such as FIB, 3D ED, 4D-STEM, HRTEM, Raman, and 29 Si MAS NMR. More importantly, Si-CHA displays promising propane/propylene separation performance even better than the one synthesized in the presence of toxic HF. In addition, the incorporation of Zn species within Si-BEA fabricated by this approach also renders superior performance on propane dehydrogenation.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Fluoride- and Seed-Free Synthesis of Pure-Silica Zeolite Adsorbent and Matrix Using OSDA-Mismatch Approach

Ma,

Liu,

Hong

et al. 2023

J. Am. Chem. Soc.

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“…[22][23][24] Consequently, many novel processes and materials are claimed as more sustainable, but, as selected examples demonstrate, often without scientific verification. [25][26][27][28][29][30][31][32][33][34] For instance, wet chemistry processes are considered advantageous compared to solid state processes due to the lower processing temperature in a recent study. 35 Data ensued proof for this sustainability statement is lacking, e.g., the additional presence of process chemicals and emissions is briefly mentioned but not further evaluated.…”

Section: Introductionmentioning

confidence: 99%

Recycling process development with integrated life cycle assessment – a case study on oxygen transport membrane material

et al. 2023

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“…4C-c). 41 Upon further increasing the crystallization time to 3.5 days, the intensity of the peak with a chemical shift of about −116.7 ppm could be increased rapidly, and the content of the Si(3Si) species was reduced (Fig. 4C-e).…”

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confidence: 95%