SAPO-11/HBeta composites for catalytic cracking of 2-butylene: effects of defect structure

Abstract

SAPO-11/HBeta composite was synthesized by using hydrothermal method (SB-H) and applied as catalyst for cracking of 2-butylene to C 2 -C 3 olefins. SB-H sample exhibited comparatively high selectivity and high yield of C 2 -C 3 olefins. XRD, IR, 27 Al and 31 P MAS NMR, Py-IR characterizations indicate that defect structure P(AlO 4 ) n (n < 4) really existed in SB-H sample. SAPO-11 and HBeta chemically bonded and the defect P(AlO 4 ) n (n < 4) formed during the hydrothermal synthesis of SB-H sample. P(AlO 4 ) n (n < 4) unit caused new B acidic sites, which increased B acidic amount and B acidic distribution on SB-H sample. The improvement of B acidity decreased apparent active energy of cracking of 2-butylene to C 2 -C 3 olefins on SB-H sample. Therefore, the high selectivity and high yield of C 2 -C 3 olefins were obtained on SB-H sample in catalytic cracking of 2-butylene.

Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

“…Up to now, different composite catalysts have been developed for various processes . Li et al synthesized HZSM‐5/MnAPO‐11 composite catalyst and concluded that the composite has a specific morphology with ZSM‐5 as core and MnAPO‐11 as shell .…”

“…Up to now, different composite catalysts have been developed for various processes. [31][32][33][34][35][36] Li et al synthesized HZSM-5/MnAPO-11 composite catalyst and concluded that the composite has a specific morphology with ZSM-5 as core and MnAPO-11 as shell. 36 In addition, results of the catalytic performance showed that HZSM-5/ MnAPO-11 composite catalyst has higher gasoline yield than ZSM-5.…”