Effect of multi-step desilication and dealumination treatments on the performance of hierarchical EU-1 zeolite for converting methanol to olefins

Organic‐Free, ZnO‐Assisted Synthesis of Zeolite FAU with Tunable SiO2/Al2O3 Molar Ratio

“…Simultaneously,ahigher SiO 2 /Al 2 O 3 molar ratio is beneficial to the hydrothermals tability of the zeolite framework since water molecules can attack the hydrophilic Al sites. [25,26] Alternatively, some metal species (including salts, oxides, and hydroxides) such as zinc nitrate, [27] sodium chloride, [28] lithi- [a] Y. [6] However, the rationalized designo fz eolite FAUw ith controllable SiO 2 /Al 2 O 3 molarr atio remains challenging.…”

“…[15][16][17][18] Unfortunately,t he product SiO 2 /Al 2 O 3 molar ratios are limited to an arrow range, [19] or the precise control of synthesis parameters concerning both seeds (either solid seed crystalso r seed gels) and reactant mixtures is sophisticated thus leading to poor reproducibility of the processes. [25,26] Alternatively, some metal species (including salts, oxides, and hydroxides) such as zinc nitrate, [27] sodium chloride, [28] lithi- [a] Y. [25,26] Alternatively, some metal species (including salts, oxides, and hydroxides) such as zinc nitrate, [27] sodium chloride, [28] lithi- [a] Y.…”

“…[15][16][17][18] Unfortunately,t he product SiO 2 /Al 2 O 3 molar ratios are limited to an arrow range, [19] or the precise control of synthesis parameters concerning both seeds (either solid seed crystalso r seed gels) and reactant mixtures is sophisticated thus leading to poor reproducibility of the processes. [25,26] Alternatively, some metal species (including salts, oxides, and hydroxides) such as zinc nitrate, [27] sodium chloride, [28] lithi-um hydroxide, [16] magnesium chloride, [29] and [N(CH 2 CH 3 ) 4 ] 2 [NiCl 4 ] [30] have been introduced in the synthesis of zeolite.T hereinto, they act as morphologym odifying agents or charge compensating agents (if at all). [25,26] Alternatively, some metal species (including salts, oxides, and hydroxides) such as zinc nitrate, [27] sodium chloride, [28] lithi-um hydroxide, [16] magnesium chloride, [29] and [N(CH 2 CH 3 ) 4 ] 2 [NiCl 4 ] [30] have been introduced in the synthesis of zeolite.T hereinto, they act as morphologym odifying agents or charge compensating agents (if at all).…”

“…[20][21][22][23][24] Also, the tailor of SiO 2 /Al 2 O 3 molar ratio can be achieved through post synthesis modification (dealumination), however,i tw ill give rise to the appearanceo fm esoporosity and ar eduction of crystallinity, which is detrimental to the separation performance. [25,26] Alternatively, some metal species (including salts, oxides, and hydroxides) such as zinc nitrate, [27] sodium chloride, [28]…”

“…[20][21][22][23][24] Also, the tailor of SiO 2 /Al 2 O 3 molar ratio can be achieved through post synthesis modification (dealumination), however,i tw ill give rise to the appearanceo fm esoporosity and ar eduction of crystallinity, which is detrimental to the separation performance. [25,26] Alternatively, some metal species (including salts, oxides, and hydroxides) such as zinc nitrate, [27] sodium chloride, [28] lithi-um hydroxide, [16] magnesium chloride, [29] and [N(CH 2 CH 3 ) 4 ] 2 [NiCl 4 ] [30] have been introduced in the synthesis of zeolite.T hereinto, they act as morphologym odifying agents or charge compensating agents (if at all). Also, some alkali ions such as potassium and sodium have been utilized for selective growth of zeolite with low SiO 2 /Al 2 O 3 molar ratio.…”