Facile Synthesis of Proton‐Type ZSM‐5 by Using Quasi‐Solid‐Phase (QSP) Method

Abstract

Herein, as imple and green quasi-solid-phase (QSP) method forf acile synthesis of proton-type ZSM-5 avoiding use of excessive water,d ry gel, Na + cation and fluoridei sr eported. Crystallization by using the stoichiometric amounto fT PAOH (tetrapropylammonium hydroxide) at 180 8Cf or only 12 hg ave well-structured HZSM-5 crystalsw ith high specific surface area of 429 m 2 g À1 and high thermals tability. 5MRs was observed to closely relate the formation of MFI structurea nd QSP method exhibits shorteri nduction period (t 0), higher nucleation rate (V n), and faster growth rate (V g). Moreover,H Z-12-180 showed extremely better and rather stable catalytic activityf or methanol-to-propylene reaction by comparison with com-mercialH ZSM-5. Zeolite usually has uniform crystal structures, unique pore systems, controllable acid sites, and high thermal/hydrothermal stability, [1-3] enabling them to be used as excellent catalysts, [4-9] adsorbents, [10, 11] and ion exchange materials. [12] They have been widely applied in the fields of petroleum and fine chemical preparation. [13-17] Proton-type ZSM-5 (HZSM-5), either as as olid acid catalyst or as upport, has been used widely in shape-selective catalysis. [18-22] Generally,Z SM-5 is synthesizedv ia ah ydrothermal method using liquid silica sourcesand large amount of water.

Synthesis of Sn‐Beta Zeolite via Quasi‐Solid‐Phase Route with Low Amount of Organic Template

“…The organic template is demonstrated to be essential, although only small amount of organic template is required. [25] Consideration of the simple operating procedures and environment-friendly way, the synthesis route is expected to be used in the synthesis of stannosilicate zeolite. Due to the large size of Sn atom, the introduction of Sn atom into framework is difficult.…”

“…Different from the typical SAC method using dry gel, Xiao and co-workers proposed a simple solvent-free method by directly grinding and heating the solid materials, which is attractive for reducing template consumption and waste liquid production. [20][21][22][23] In this route, Ti-containing zeolite (TS-1, Ti-Beta) [24] and proton-type ZSM-5 [25] was prepared. The organic template is demonstrated to be essential, although only small amount of organic template is required.…”

“…In this route, Ti‐containing zeolite (TS‐1, Ti‐Beta) [24] and proton‐type ZSM‐5 [25] was prepared. The organic template is demonstrated to be essential, although only small amount of organic template is required [25] . Consideration of the simple operating procedures and environment‐friendly way, the synthesis route is expected to be used in the synthesis of stannosilicate zeolite.…”