Synthesis of CHA-type titanosilicate zeolites using titanium oxide as Ti source and evaluation of their physicochemical properties

On the key role of aluminium and other heteroatoms during interzeolite conversion synthesis

“…Sn or Ti), post-synthetically produced catalysts also suffer from reduced hydrophobicity due to the difficultly of healing the Si nests formed. [176][177][178][179][180][181][182][183][184] Many hydrothermal synthesis routes involve the use of uoride to obtain hydrophobic zeotypes. 169,170 Fluoride is environmentally unfriendly and hazardous, but oen essential to obtain certain zeotypes.…”

“…Furthermore, synthesis time (maturation) was found to be crucial for heteroatom incorporation in certain zeotypes (Zr or Sn-BEA). Combined with other successful zeotype synthesis methods, such as seeding 184,186,187,191 IZC is predicted to further prosper the development of superior zeotype materials, a constantly evolving eld with emerging applications.…”

Chabazite Synthesis and Its Exchange with Ti, Zn, Cu, Ag and Au for Efficient Photocatalytic Degradation of Methylene Blue Dye

“…In TiCHA, there was a slight shift of the peak at 960 cm −1 from the CHA at 969 cm −1 , attributable to the Si-O-Ti bond. A certain amount of Ti could be incorporated into the cha structure during exchange treatment [51].…”

Ultrasonic-pretreated hydrothermal synthesis of less dense zeolite CHA from the transformation of zeolite T

“…Its structure is made of a double 6-ring (D6R) as the basic building and its large CHA cavity is accessed by six eight-ring windows measuring around 0.38 nm × 0.38 nm [16] , [17] . Due to its 3-dimensional interconnected pore system with 8-ring windows (0.38 nm × 0.38 nm), zeolite CHA has received particular attention as a versatile catalyst and adsorbent in many processes such as conversion of methanol or ethanol into light olefins (MTO), selective catalytic reduction (SCR) of NOx, separation membrane for the dehydration of aqueous organic solutions and gas separations [17] , [18] , [19] , [20] , [21] , [22] . Zeolite CHA has been synthesized through interzeolite transformation using LEV [23] , FAU [24] , [25] and MFI [26] zeolites as the original crystals.…”