%L scholars7107
%I Elsevier
%A M. Sedighi
%A M. Ghasemi
%A M. Sadeqzadeh
%A M. Hadi
%P 131-139
%X SAPO-34 and MeAPSO-34s (Me = Fe, Co, Ni, La and Ce) molecular sieves were synthesized and used as catalysts for conversion of methanol to light olefins. X-ray diffraction, scanning electron microscopy, nitrogen adsorption-desorption inductively coupled plasma mass spectrometry, Fourier transform infrared spectroscopy and temperature programmed desorption techniques were used to characterize the synthesized catalysts. Thermogravimetric analysis was used to investigate the amount of coke deposited on the spent catalysts during the reaction. The synthesized MeAPSO-34s had the same chabazite topology structure, while metal incorporation gave rise to the different micropore area and acidity. All the SAPO-34 and MeAPSO-34 molecular sieves were very active and selective catalyst for light olefins production. Metal incorporation improved the catalyst lifetime and favored the ethylene and propylene product. Concerning the yield of light olefins at 425 °C and 1 bar, NiAPSO-34 favored ethylene production and CeAPSO-34 and LaAPSO-34 were helpful for propylene production. Light olefins yield decreased with time on stream for all the samples; although, this decrease rate is lower for MeAPSO-34 than for the parent SAPO-34. The catalyst lifetime increased in an order as follows: Ce- > La- > Co- > Ni- > Fe- > SAPO-34. The rare earth modified catalysts exhibited lower methanation than parent SAPO-34 and transition metal modified catalysts. © 2015 Elsevier B.V.
%J Powder Technology
%K Characterization; Desorption; Ethylene; Fourier transform infrared spectroscopy; Gas adsorption; Mass spectrometry; Metals; Molecular sieves; Nickel; Nitrogen plasma; Olefins; Propylene; Scanning electron microscopy; Sieves; Temperature programmed desorption; Thermogravimetric analysis; Transition metals; X ray diffraction, Catalytic performance; Lifetime; Light olefins; Meapso-34; Nitrogen adsorption desorption; Propylene production; SAPO-34; SAPO-34 molecular sieves, Catalysts, alkene; cesium alumino phosphate silico 34; chemical compound; cobalt alumino phosphate silico 34; ethylene; iron alumino phosphate silico 34; lanthanum alumino phosphate silico 34; methanol; nickel alumino phosphate silico 34; propylene; silico alumino phosphate 34; unclassified drug; zeolite, acidity; adsorption kinetics; Article; catalyst; chemical reaction; controlled study; crystal structure; infrared spectroscopy; mass spectrometry; methanol to olefin process; molecular biology; molecular model; molecular sieve; phase transition; reaction analysis; scanning electron microscopy; structure analysis; temperature measurement; thermogravimetry; X ray diffraction
%D 2016
%V 291
%T Thorough study of the effect of metal-incorporated SAPO-34 molecular sieves on catalytic performances in MTO process
%O cited By 56
%R 10.1016/j.powtec.2015.11.066