Nano BEA zeolite catalysts for the selective catalytic cracking of n-dodecane to light olefins

Abstract

Nano BEA zeolite catalysts were synthesized and modified by desilication and then ion-exchanged with Co. The desilication was carried out using 0.1 M of NaOH.

Acidity modifications of nanozeolite-Y for enhanced selectivity to olefins from the steam catalytic cracking of dodecane

“…80% with 50% total olefins yield, slightly higher than BEA zeolites. 32 The produced olefins included ca. 22% ethylene, 17% propylene and 11% butylene.…”

Steam Catalytic Cracking of n-Dodecane to Light Olefins over Phosphorous- and Metal-Modified Nanozeolite Y

“…The increasing olefin yield in the P-modified zeolite was also obtained in several reports. , In terms of olefin distribution, the catalysts showed different behaviors at different temperatures. In general, the olefin distribution (Figure b) at all temperatures was ethylene> propene> butenes, implying that nanozeolite Y preferred ethylene as indicated by the propene/ethylene (P/E) ratio, unlike BEA zeolites, which favored butenes . Increasing temperature also increased the ethylene selectivity and reached an optimum value of ca.…”

Mesoporogen-free synthesis of single-crystalline hierarchical beta zeolites for efficient catalytic reactions

“…[1][2][3][4][5][6][7][8] In particular, Beta (*BEA) zeolites with three-dimensional intersecting 12-ring channels have been widely used in various important industrial catalytic processes, such as cracking, alkylation, isomerization reactions, and biomass conversions. [9][10][11][12][13][14][15][16] However, the sole microporosity of conventional zeolites may cause severe mass-transfer limitations especially when bulky molecules are involved in the reactions, thus increasing the coke formation, lowering the target product selectivity, and decreasing the catalyst lifetime. To address the poor masstransfer issue in microporous systems, the synthesis of hierarchical zeolites has proven to be an efficient strategy to alleviate mass-transfer limitations and consequently improve their catalytic performance.…”

“…1–8 In particular, Beta ( *BEA ) zeolites with three-dimensional intersecting 12-ring channels have been widely used in various important industrial catalytic processes, such as cracking, alkylation, isomerization reactions, and biomass conversions. 9–16…”