Affecting the Formation of the Micro‐structure and Meso/macro‐structure of SAPO‐34 zeolite by Amphipathic Molecules

Abstract

SAPO-34 is an important member in the family of zeolites, which shows excellent catalytic activity in MTO reaction, but suffers from the diffusion bottleneck. To overcome the diffusion problem, porogen was added to generate meso/macro pores in SAPO-34 zeolite. In this work, amphipathic molecules were designed as CSDA to synthesize a tri-level hierarchically porous SAPO-34, and the introduction of CSDA could promote the Si atoms incorporating into the AlPO 4 framework, change the morphology of particles and decrease the acidity of prepared SAPO-34 zeolite. The prepared SAPO-34 catalyst exhibits higher selectivity of C 2 H 4 and C 3 H 6 in the MTO reaction than the conventional SAPO-34 zeolite. The morphology and the microstructure of the prepared samples vary with the carbon chain of the amphipathic molecules due to the matching between amphipathic molecules and topological structure of CHA.

Enhanced CO2 Capture through SAPO-34 Impregnated with Ionic Liquid

“…To evaluate the effect of IL loading on the crystal structure of the molecular sieves, XRD was performed on the samples before and after loading, as shown in Figure 3 c. The diffraction peaks indicated that the loaded IL maintained the crystal structure of the pristine SAPO-34, with diffraction peaks at 2θ of 9.56, 12.98, 16.16, 20.76, 26.08, and 31.22° attached to (101), (110), (021), (121), (220), and (401) planes of SAPO-34, respectively. 33 , 34 The peaks are of high intensity, indicating that the loaded IL remains well crystalline and suggesting that the IL deposit does not alter the crystal structure of original SAPO-34.…”