Catalytic conversion of methanol to olefins over rare earth (La, Y) modified SAPO-34

Abstract

SAPO-34 modified with lanthanum and yttrium exhibited higher selectivity to light olefins, lower methane formation, and longer lifetime (prolonged by 20%) than the parent SAPO-34 in the process of methanol conversion to olefins. The modified catalytic performance could be ascribed to the incorporation of La 3? and Y 3? into the framework of SAPO-34.

Experimental and Kinetic Modeling Studies of Methanol Transformation to Hydrocarbons Using Zeolite-Based Catalysts: A Review

“…Yttrium and lanthanum modified SAPO-34 catalyst was used for the MTO process at T = 723 K, P = 1 atm, and WHSV = 2.1 h –1 . 3 wt % La-SAPO-34 showed 89.7% selectivity toward olefins, while the 3 wt % Y-SAPO-34 catalyst gave the highest selectivity of lighter olefins 92.2% and increased the catalytic lifetime . Zn doped ZSM-11 catalyst was used during the MTO reaction at T = 723 K, P = 1 atm, and WSHV = 5.53 h –1 in a fixed bed reactor.…”

“…The effect of WHSV on methanol to hydrocarbon conversion using catalysts was investigated. The transformation of methanol or DME to hydrocarbon is slow initially at low WHSV while increasing the WHSV; there is a rapid increase in the conversion. ,− Increasing the WHSV may deteriorate the product selectivity and also reduce the transformation of the reactant. Mn/HZSM-5 was impregnated with Ce for the MTO reaction with varying WHSV from 2.51, 4.18, and 8.37 h –1 and temperature from 673 to 773 K. The Ce-Mn/HZSM-5 catalyst showed a higher selectivity of 51% toward propylene at 743 K and 2.5 h –1 .…”

Physicochemical characterization to assess Ni and Zn incorporation into zeotype SAPO-34 nanoparticles synthesized with different mixing methods through ultrasound-promoted crystallization

“…The absorption band in the short-wavelengths (<350 nm), which is inherent in different types of zeolites and zeotype materials, originates from the Al-O charge transfer transitions. 45,61…”

Computational fluid dynamics simulation of system hydrodynamics in a riser of stage circulating fluidized bed reactor

“…However, the MTO process is profitable only when the price of petroleum is high. To maximize the chemical reaction conversion, several industrial catalysts have been investigated …”

“…To maximize the chemical reaction conversion, several industrial catalysts have been investigated. [6][7][8][9][10][11][12][13][14] Besides catalyst development, the use of an appropriate chemical reactor can also improve the conversion efficiency of the chemical reaction. The MTO chemical reaction has been extensively studied in fixed bed reactor [15][16][17] and circulating fluidized bed (CFB) reactor (CFBR) 18,19 by experiment and computational fluid dynamics (CFD) simulations.…”