In-situ transition of amorphous gels to Na-P1 zeolite in geopolymer: Mechanical and adsorption properties

Zheng, Zhao; Xue, Ming; Zhang, Zuhua; Li, Yuxiang

doi:10.1016/j.conbuildmat.2019.01.067

Cited by 56 publications

(33 citation statements)

References 33 publications

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“…Similarly, an increased concentration of these alkalis may reduce the formation of this zeolite typology, promoting the formation of other zeolites, such as the faujasite which was identified here. 53,54 Likewise, one can conclude that the increase in P-type zeolite in T75.M8.H15 results mainly from lower sodium concentration. Otherwise, in samples prepared with 10 mol/L solutions, the higher sodium concentration favored the formation of faujasite-type zeolite, as previously discussed.…”

Section: Influence Of the Activator Molaritymentioning

confidence: 91%

“…According to the theoretical compositions of the cards used in this work (XRD, Figure 3), faujasite zeolite has a theoretical composition of Na 17 These results are in line with other studies reported in the literature using coal fly ashes for P-type zeolite formation. 53,54 Zheng et al 53 report that the Na 2 O/Al 2 O 3 ratio and alkaline concentration are the main factors that influence the formation of P-type zeolite, with the ratios close to 1.00 being the most appropriate. 53 In fact, when evaluating the Na 2 O/Al 2 O 3 ratios of the samples, an increase from T75.M8.H15 (1.34) to T75.M12.H15 (1.69) is observed.…”

Section: Influence Of the Activator Molaritymentioning

confidence: 99%

“…53,54 Zheng et al 53 report that the Na 2 O/Al 2 O 3 ratio and alkaline concentration are the main factors that influence the formation of P-type zeolite, with the ratios close to 1.00 being the most appropriate. 53 In fact, when evaluating the Na 2 O/Al 2 O 3 ratios of the samples, an increase from T75.M8.H15 (1.34) to T75.M12.H15 (1.69) is observed. Similarly, an increased concentration of these alkalis may reduce the formation of this zeolite typology, promoting the formation of other zeolites, such as the faujasite which was identified here.…”

Section: Influence Of the Activator Molaritymentioning

confidence: 99%

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Zeolites‐containing geopolymers obtained from biomass fly ash: Influence of temperature, composition, and porosity

et al. 2020

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In this research, compositional and processing parameters were varied to obtain zeolites-containing geopolymers using mainly biomass fly ash wastes. In addition to curing temperatures, another primary factor affecting the typologies of the resulting zeolites was composition. The mixture composition used in the synthesis crucially affects the nature of the zeolitic crystalline phases in the geopolymeric matrix. Using 10 mol/L NaOH solution, faujasite-type zeolites produced in geopolymers show a surface area of ~100 m 2 /g (BET), while those prepared by 8 mol/L NaOH solution have a much lower surface area of ~19 m 2 /g.

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Section: Influence Of the Activator Molaritymentioning

confidence: 91%

Section: Influence Of the Activator Molaritymentioning

confidence: 99%

Section: Influence Of the Activator Molaritymentioning

confidence: 99%

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Zeolites‐containing geopolymers obtained from biomass fly ash: Influence of temperature, composition, and porosity

et al. 2020

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“…The Langmuir adsorption model is a monolayer adsorption model. Since the isotherm of coal adsorption methane conforms to the first type of isotherm classified by the International Union of Pure and Applied Chemistry (IUPAC) adsorption isotherm, researchers use the Langmuir adsorption model to calculate the amount of coal methane adsorption [34][35][36]. The expression is:…”

Section: Langmuir Model Fitting Analysismentioning

confidence: 99%

Evaluating Methane Adsorption Characteristics of Coal-Like Materials

Zhao

Liu

et al. 2020

Materials

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In order to investigate the methane adsorption characteristics of coal seam materials in a “solid–gas” coupling physical simulation experiment, activated alumina, silica gel, the 3Å molecular sieve, 4Å molecular sieve and 5Å molecular sieve were selected as adsorption materials. According to the pore structure and adsorption characteristics, coal samples at the Aiweiergou #1890 working face were prepared as compared materials. The WY-98A methane adsorption coefficient measuring instrument was used to carry out this adsorption experiment under different temperatures, particle sizes and moisture contents. The results suggested that the adsorption principles of three kinds of molecular sieves under multiple factors do not fully fit a Langmuir adsorption model, and cannot be used as adsorption materials. The changing trend of the adsorption increment of activated alumina and silica gel are similar to that of coal samples, so they can be used as a coal-like materials. The methane adsorption coefficient a value changing trends of activated alumina and silica gel appear to be the same as the Aiweiergou #1890 coal samples, but the results from silica gel are closer to that of coal samples. Thus, silica gel is preferred as the adsorption material. The result provides an experimental basis for the selection of methane-adsorbing materials and carrying out “solid–gas” coupling physical simulation experiments in a physically similar testing model.

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“…Low-calcium AABs mainly consist of cross-linked zeolite-like aluminosilicate gel (N-A-S-H gel) [30] and have been used for various applications, including membranes and catalysts [31][32][33]. In various publications, transformations of AABs into zeolites have been investigated [34][35][36]. For example, adsorption properties of CO 2 on AAB materials were studied by Minelli et al [36].…”

Section: Introductionmentioning

confidence: 99%

Alkali-Activated Metakaolin as a Zeolite-Like Binder for the Production of Adsorbents

et al. 2019

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This work reports and describes a novel alkali-activated metakaolin as a potential binder material for the granulation of zeolites, which are widely used as CO2 adsorbents. The alkali-activated binders are zeolite-like materials, resulting in good material compatibility with zeolite-based adsorbents. A major problem during the granulation of zeolites is that their adsorption capacities decrease by about 15–20%, because typical binder materials (for example bentonite or kaolin clay) are inactive towards CO2 adsorption. A possible pathway to solve this problem is to introduce a novel binder that is also able to sorb CO2. In such a case, a binder plays a dual role, acting both as a binding material and as a sorbent. However, it is important that, alongside the adsorptive properties, a novel binder material must fulfil mechanical and morphological requirements. Thus, in this work, physical and mechanical properties of this novel binder for zeolite granulation for CO2 adsorption are studied. Alkali-activated metakaolin was found to be efficient and competitive as a binder material, when mechanical and physical properties were concerned. The compressive strengths of most of the obtained binders reported in this work are above the compressive strength threshold of 10 MPa. The future work on this novel binder will be conducted, which includes granulation-related details and the CO2 adsorptive properties of the novel binder material. Metakaolin was used as a precursor for alkali-activated binders. Binders were synthesized using varying molarity of a NaOH solution and at varying curing conditions. The final products were characterized using density measurements, compressive strength tests, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) analysis, and scanning electron microscopy (SEM).

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In-situ transition of amorphous gels to Na-P1 zeolite in geopolymer: Mechanical and adsorption properties

Cited by 56 publications

References 33 publications

Zeolites‐containing geopolymers obtained from biomass fly ash: Influence of temperature, composition, and porosity

Zeolites‐containing geopolymers obtained from biomass fly ash: Influence of temperature, composition, and porosity

Evaluating Methane Adsorption Characteristics of Coal-Like Materials

Alkali-Activated Metakaolin as a Zeolite-Like Binder for the Production of Adsorbents

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