Synthesis of Small-Sized SAPO-34 Crystals with Varying Template Combinations for the Conversion of Methanol to Olefins

Zhang, Yanjun; Ren, Zhibo; Wang, Yinuo; Deng, Yinjie; Li, Jianwei

doi:10.3390/catal8120570

Cited by 13 publications

(7 citation statements)

References 30 publications

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“…Marchese et al [41] reported that on average, 1.5 molecules of morpholine present within the chabazite channels of SAPO-34. Meanwhile, the molecular volume of cyclic morpholine is significantly lower than that of TEA, which contains three ethyl branches [42]. In the case of Mor/TEA/TEAOH mixture, because the material framework and TEAOH templating agent had the most potent force and easily linked with the aluminum atoms, silicon atoms, and phosphorus atoms at the precursor process of crystallization, adding TEAOH enhances the medium number of OSDAs in the material cage.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of SAPO-34 Using Different Combinations of Organic Structure-Directing Agents

Doan

Nguyen

Dam

et al. 2019

Journal of Chemistry

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The effects of different mixtures of organic structure-directing agents (OSDAs) on the formation of SAPO-34 structure have been investigated. Different OSDAs, namely, triethylamine (TEA), tetraethylammonium hydroxide (TEAOH), and morpholine (Mor) and their combinations were used to synthesize SAPO-34 by a hydrothermal method. The template concentration was optimized by eliminating the competing phases to obtain the purest form of SAPO-34 phase. The as-synthesized samples were analyzed by XRD, FE-SEM/EDS, FT-IR, surface area/pore volume measurements, NH3-TPD, TG/DTA, and 29Si NMR MAS. The selection of template notably impacts the crystal size and physicochemical characteristics of as-synthesized SAPO-34. The sample prepared with 3 Mor : 3 TEA : 1 TEAOH exhibited the highest total acidity, smallest crystal size below 3 µm, and high surface area up to 697 m2/g.

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Section: Resultsmentioning

confidence: 99%

Synthesis of SAPO-34 Using Different Combinations of Organic Structure-Directing Agents

Doan

Nguyen

Dam

et al. 2019

Journal of Chemistry

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“…The former has inspired many advances in SAPO synthesis, as many of the synthetic techniques discussed before, were explored with the notion that smaller particle size can extend the lifetime of SAPO-34. [85][86][89][90] Most recently this has resulted in hierarchical SAPOs, a notion inspired by work on zeolites. [245][246][247] The micropores in SAPOs are responsible for numerous catalytic benefits, including selectivity control and confined active sites.…”

Section: Sapo-34 In the Mto Processmentioning

confidence: 99%

“…The current research focuses on extending the catalyst lifetime and understanding the reaction mechanism, with emphasis on the formation of initial C–C bonds and coke precursors. The former has inspired many advances in SAPO synthesis, as many of the synthetic techniques discussed before were explored with the notion that smaller particle size can extend the lifetime of SAPO-34. ,,, Most recently, this has resulted in hierarchical SAPOs, a notion inspired by work on zeolites. − The micropores in SAPOs are responsible for numerous catalytic benefits, including selectivity control and confined active sites. However, small channels can hinder diffusion, preventing reactants to reach the active sites, hindering activity.…”

Section: Catalytic Case Studies Of Saposmentioning

confidence: 99%

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Down the Microporous Rabbit Hole of Silicoaluminophosphates: Recent Developments on Synthesis, Characterization, and Catalytic Applications

Potter

2020

ACS Catal.

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Word 2010, single-column, double-spaced (2013)This template is a guide to be used to prepare manuscripts for submission. Please consult the Instructions to Authors or a recent issue of the journal for detailed guidelines and procedures for submission. This template is intended to benefit to the author in that the entire manuscript (text, tables, and graphics) may be submitted in one file. Inserting graphics and tables close to the point at which they are discussed in the text of the manuscript can also be a benefit for the reviewer.When you submit a manuscript using this template, you will not actually see the page formatting that appears in the printed journal. This will occur as part of the editorial production process. Abbreviated instructions for using the template follow. Consult the documentation for your specific application and version for more information. Additional instructions can be found in the readme file at the web page where you downloaded this template. Using the templateIn ACS publications there are many different components of a manuscript (i.e., title, abstract, main text, figure captions, etc.) that are represented in the template. See the Guide, Notes, Notice, or Instructions for Authors on the journal's homepage to determine which parts should be included for the manuscript that you are preparing 1. If typing your manuscript directly into the template, select (highlight) the text of the template that you want to replace and begin typing your manuscript (i.e., select the Title section for typing in your title).2. If you have already prepared your document in a Word file, you will need to attach the template to your working document in order to apply the Word Style tags. Further instructions can be found in the readme file at the web page where you downloaded this template.a. Go to the Add-Ins tab and you will see all the Word Styles from the template that has now been imported into the current document. A Styles toolbar has been generated that will display the different Styles for you to choose from. If this is not present, type in the following command (Alt+Ctrl+Shift+S) and it should appear. You can close this at any time and then reopen it when needed.b. Click in the sentence or paragraph and then go to the Add-Ins tab and select the relevant Word Style. This will apply the Word Style to the entire text (sentence or paragraph). Do this for all sections of the manuscript.3. To insert graphics within the text or as a figure, chart, scheme, or table, create a new line and insert the graphic where desired. If your graphic is not visible, ensure that the Word Style is "Normal" with an automatic height adjustment. If the size of the artwork needs to be adjusted, re-size the artwork in your graphics program and re-paste the artwork into the template (maximum width for single-column artwork, 3.3 in. (8.5 cm); maximum width for double-column artwork, 7 in. (17.8 cm)). NOTE: If you are submitting a Table of Contents graphic, please insert the graphic at the end of the file.4. Ensure that page numb...

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“…SAPO-34 zeolite plays a pivotal role in the chemical industry [1]. One of its important applications is in a methanol-to-olefins (MTO) process [2][3][4][5]. Recently, the Chinese government has passed an agreement to scale up MTO processes in tons per year and many operational units are expected in the coming years [6].…”

Section: Introductionmentioning

confidence: 99%

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

et al. 2019

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Propene is an important synthetic industrial product predominantly formed by a methanol-to-olefins (MTO) catalytic process. Propene is known to form oligomers on zeolite catalysts, and paramters to separate it from mixtures and its diffusion properties are difficult to measure. Herein, we explored the adsorption–chemisorption behavior of propene by choosing SAPO-34 zeolites with three different degrees of acidity at various adsorption temperatures in an ultra-high-vacuum adsorption system. H-SAPO-34 zeolites were prepared by a hydrothermal method, and their structural, morphological, and acidic properties were investigated by XRD, SEM, EDX, and temperature-programmed desorption of ammonia (NH3-TPD) analysis techniques. The XRD analysis revealed the highly crystalline structure which posses cubic morphology as confirmed by SEM images. The analysis of adsorption of propene on SAPO-34 revealed that a chemical reaction (chemisorption) was observed between zeolite and propene at room temperature (RT) when the concentration of acidic sites was high (0.158 mmol/g). The reaction was negligible when the concentration of the acidic sites was low (0.1 mmol/g) at RT. However, the propene showed no reactivity with the highly acidic SAPO-34 at low temperatures, i.e., −56 °C (using octane + dry ice), −20 °C (using NaCl + ice), and 0 °C (using ice + water). In general, low-temperature conditions were found to be helpful in inhibiting the chemisorption of propene on the highly acidic H-SAPO-34 catalysts, which can facilitate propene separation and allow for reliable monitoring of kinetic parameters.

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Synthesis of Small-Sized SAPO-34 Crystals with Varying Template Combinations for the Conversion of Methanol to Olefins

Cited by 13 publications

References 30 publications

Synthesis of SAPO-34 Using Different Combinations of Organic Structure-Directing Agents

Synthesis of SAPO-34 Using Different Combinations of Organic Structure-Directing Agents

Down the Microporous Rabbit Hole of Silicoaluminophosphates: Recent Developments on Synthesis, Characterization, and Catalytic Applications

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

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