Quantitative arrangement of Si/Al ratio of natural zeolite using acid treatment

Regulation of the Si/Al ratios and Al distributions of zeolites and their impact on properties

“…Because of the intrinsic affinity of proton to water and the non-negligible difference in the stability between Si-O and Al-O bonds, the concentration and distribution of Al atoms will affect the hydrophilicity/hydrophobicity and stability of zeolites. [15][16][17][18][19][20] Typically, Y zeolite (FAU-type) synthesized with a conventional template-free route usually has Si/Al ratios of < 3 and suffers from poor hydrothermal stability during the catalysis. 21,22 Therefore, high-silica Y zeolite was either synthesized via utilization of organic structure-directing agents (OSDAs) 23,24 or prepared by dealumination of low silica Y zeolite via steam treatment.…”

Study of the Hydrogen Pretreatment of Gallium and Platinum Promoted ZSM-5 for the Ethane Dehydroaromatization Reaction

“…17,[24][25][26]28,29 Zeolites can be categorized by what is known as the SiO 2 /Al 2 O 3 ratio (SAR), which can influence a zeolite's acidity, catalytic activity, hydrophobic/hydrophilic behavior, and polarization toward reactants and products. 30,31 The surface acidities of zeolites have been extensively researched to determine the type, strength, and number of acid sites, which can affect a zeolite support's potential catalytic performance. 25,32−36 Characterization of these sites is important, so a variety of physicochemical techniques have been developed over the years.…”

“…The MFI-type zeolites pores are large enough for the BTX to diffuse out but small enough to hinder the growth of polyaromatic species within the pores. These unique features make ZSM-5 an ideal support for the direct conversion of light alkanes to aromatics. ,− ,, Zeolites can be categorized by what is known as the SiO 2 /Al 2 O 3 ratio (SAR), which can influence a zeolite’s acidity, catalytic activity, hydrophobic/hydrophilic behavior, and polarization toward reactants and products. , …”

Pengaruh Variasi Konsentrasi NaOH Pada Zeolit Alam Lampung Terhadap Produk Silika

“…Konsentrasi asam, waktu dan suhu yang digunakan dapat secara efektif mengatur luasnya dealuminasi rasio SiO 2 atau Al 2 O 3 dari zeolit alam. Zeolit yang diolah dengan asam disiapkan dengan rasio SiO 2 atau Al 2 O 3 yang berbeda, diatur oleh konsentrasi asam yang memiliki luas permukaan spesifik yang lebih tinggi, volume mikropori, kandungan gugus silanol dan hidrofobisitas (Wang et al, 2019). Zeolit alam dengan komposisi yang berbeda dimodifikasi dengan larutan natrium hidroksida (NaOH).…”