Synthesis and application prospect of small-pore zeolites in vehicle exhaust purification

Zhang, Jie; Li, Zhenguo; Yi, Honghong; Tang, Xiaolong; Cheng, Haodan; Yu, Qingjun

doi:10.1016/j.fuel.2023.128577

Cited by 14 publications

(8 citation statements)

References 109 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 Therefore, several measures have been taken to eliminate the problem of vehicle exhausts, such as implementing traffic running, opening the subway, and walking instead of using cars. [6][7][8] Nevertheless, with the growth of the national economy, the increase in demand for automobiles has made traditional methods of eliminating the negative effects from vehicle emissions incompetent. 9 Therefore, how to reduce vehicle exhaust efficiently is an important topic of exploration.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and forming conditions optimization of SiC ceramics using Camellia oleifera shell as carbon source

Li,

Chen,

Lin

et al. 2024

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Using Camellia oleifera shell as raw materials to preparative SiC ceramics by warm‐press forming and sintering is proposed in this paper. Warm‐press forming before preparing for the C. oleifera shell‐based SiC ceramics is beneficial to obtain the internal uniform and suitable pore structure of the cylindrical sample. Thermogravimetric analysis with differential scanning calorimetry was applied to analyze the pyrolysis behavior of C. oleiefra shell and phenolic resin. The scanning electron microscope and X‐ray diffraction were used to investigate the properties of C. oleifera shell‐based SiC ceramics. Then, the response surface method was applied to establish a multivariate prediction model based on the process parameters of warm‐press forming. And the regression equations of porosity and bending strength of COS‐SiC are obtained. The result demonstrated that the predicted and experimental values can be in good agreement for the model. By comparing the F‐value, it is found that the forming temperature and pressure during the process of warm‐press forming have a more significant influence on the porosity and bending strength of SiC ceramics. The optimization process parameters were obtained as follows: forming temperature 153°C, pressure 35 MPa, and holding time 30 min.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical properties and forming conditions optimization of SiC ceramics using Camellia oleifera shell as carbon source

Li,

Chen,

Lin

et al. 2024

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…16,17 This favorable combination of small pores connected with a large cage, along with their relatively low-cost production, tunable acidity, and hydrothermal stability explains that both the aluminosilicate (SSZ-13) and the silicoaluminophosphate (SAPO-34) version of the CHA framework have been intensively studied and commercially applied for SCR of NO X and the MTO reaction. 2,5,7,9,10,16,18 The CHA framework exhibits similarities with the ALPO 4 -18 framework (AEI), as both frameworks share identical building blocks but differ in the connection mode of the double 6-rings (D6R). 4 As illustrated in Figure 1, in AEI, the adjacent D6Rs display mirror symmetry, while in CHA, they align in parallel, resulting in distinct cage shapes.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Each framework offers a combination of cages and/or pores channels. This distinctive combination of molecular-sized structures makes zeolites widely applied in adsorptive separations, catalytic conversion processes, and ion-exchange applications. − Zeolite frameworks can be categorized based on their smallest accessible pore opening. − Small-pore zeolites have an eight-membered ring (8MR) as largest opening, which is the smallest pore size (∼4.0 Å 4 ) through which hydrocarbons can diffuse.…”

Section: Introductionmentioning

confidence: 99%

“…Small-pore zeolites serve as attractive catalysts for both the selective catalytic reduction (SCR) of nitrogen oxide (NO X ) gases and the methanol-to-olefins (MTO) reaction. ,− They are also increasingly used in catalytic reactions facilitating the renewable carbon transition such as the direct conversion of CO 2 to olefins. − As depicted in Figure c, the chabazite framework (CHA) features a large cylindrical cage interconnected by narrow 8MR pore windows (3.8 Å 4 ). This arrangement creates discrete catalytic sites within the zeolite, allowing only small molecules to diffuse in and out. , This favorable combination of small pores connected with a large cage, along with their relatively low-cost production, tunable acidity, and hydrothermal stability explains that both the aluminosilicate (SSZ-13) and the silicoaluminophosphate (SAPO-34) version of the CHA framework have been intensively studied and commercially applied for SCR of NO X and the MTO reaction. ,,,,,, …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploring Cage Effects of Alkane Adsorption on SSZ-39 (AEI) and SSZ-13 (CHA) Zeolites: A Comparative Study

De Witte,

Van,

Robijns

et al. 2024

J. Phys. Chem. C

View full text Add to dashboard Cite

Despite the recognized importance of the unique basket shape of the AEI zeolite cage in catalytic and separative applications, fundamental research on the adsorption properties of SSZ-39 (AEItype) is still missing. Here, the adsorption properties of n-alkanes on a Na-SSZ-39 zeolite up to 320 °C were investigated by using inverse gas chromatography (IGC). Our findings reveal an unusual nonmonotonic increase of the Henry constant with increasing carbon number, marked by local minimum, signifying the presence of so-called cage effects. These cage effects are a direct result of the combination of small pores connected by larger cages found in the AEI framework and have only been experimentally reported for the CHA topology. A coiled-chain adsorption mechanism has been proposed using thermodynamic analysis, where long n-alkanes undergo a transition from one-to two-cage adsorption. A comparison with Na-SSZ-13 (CHAtype), a zeolite with a comparable cage-window structure and silica−alumina ratio, revealed that the local minimum of Henry constant occurs at n-octane for Na-SSZ-39 and n-nonane for Na-SSZ-13, even though both samples have comparable cage dimensions. Additionally, our results were compared to all available experimental data in the existing literature on cage effects in small-pore zeolites. Comparison of low-, medium-, and high silica CHA-type zeolites highlighted that Si/Al-ratios and cations impact the adsorption mechanism and the magnitude of cage effects for n-alkanes. Our findings open the door to synthetic attempts to actively influence and design adsorbents with tailored local minima.

show abstract

“…Zeolites are widely used as ion exchangers for water purification (Jedla et al., 2022; Khadem et al., 2022), catalysts (Clemente et al., 2019; Gao et al., 2023; Gonzalez Martinez, 2020), detergents formulation (Koohsaryan et al., 2020; Yusriadi et al., 2020), nuclear waste entrapment (Escamilla‐Pérez et al., 2023; Li et al., 2022; Murukutti & Jena, 2022), building materials (Kaplan et al., 2021; Lehner & Hrabová, 2023; Molinari et al., 2019), gas separation and purification (Cho et al., 2023; Qi et al., 2023; Zhang et al., 2023), among others. These materials can be found in nature or be synthesized by aluminium and silicon sources by alkaline activation.…”

Section: Introductionmentioning

confidence: 99%

Zeolites synthesized from agro‐industrial residues applied in agriculture: A review and future prospects

de Carvalho Izidoro,

Fungaro,

Cataldo

2023

Soil Use and Management

View full text Add to dashboard Cite

Zeolites have been widely applied as catalysts, wastewater treatment agents, gas adsorbents and fertilizers, among others. However, the use of natural zeolites or those synthesized from oversaturated commercial solutions are more explored commercially than the zeolites synthesized from residues. Therefore, the aim of this review is to highlight the importance of zeolites synthesized from agro‐industrial residues and their use in agriculture. This review has been divided into three different sections, that is, zeolites, agriculture applications, synthesis of zeolites from residues and their application in plant growth. In the first section, the definition, types and the critical properties of zeolites are explained. The second section gives a brief review of the application of zeolites in agriculture. Finally, the synthesis of zeolites from residues, such as coal ash, rice husk ash and sugarcane ash, with special attention to renewable sources is presented. The optimization of the synthesis of zeolites from residues with the incorporation of specific nutrients necessary for the cultivation of soybeans, corn and sugarcane (considered the most significant crops in Brazilian agriculture in terms of the planted area) can significantly contribute to the concept of circular economy at the industries and the fulfilment of sustainable development objectives, especially, the number 12 (SDO—12—Responsible consumption and production).

show abstract

Synthesis and application prospect of small-pore zeolites in vehicle exhaust purification

Cited by 14 publications

References 109 publications

Mechanical properties and forming conditions optimization of SiC ceramics using Camellia oleifera shell as carbon source

Mechanical properties and forming conditions optimization of SiC ceramics using Camellia oleifera shell as carbon source

Exploring Cage Effects of Alkane Adsorption on SSZ-39 (AEI) and SSZ-13 (CHA) Zeolites: A Comparative Study

Zeolites synthesized from agro‐industrial residues applied in agriculture: A review and future prospects

Contact Info

Product

Resources

About