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Characterization of the Effects of Vanadium Traps in Cracking Catalysts by Imaging Secondary Ion Mass Spectrometry and Microactivity Test
Author(s) -
Lin LongHui,
Chao KueiJung,
Ling YongChien,
Hwang JanFu,
Hou LiangYuan
Publication year - 1997
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199700085
Subject(s) - vanadium , chemistry , catalysis , fluid catalytic cracking , coke , spinel , secondary ion mass spectrometry , cracking , mass spectrometry , zeolite , inorganic chemistry , analytical chemistry (journal) , chemical engineering , metallurgy , chromatography , organic chemistry , materials science , engineering
The vanadium trapping effect of Mg and La containing additives in cracking catalyst contaminated with 2300 ppm Ni and 4700 ppm V has been analyzed by microactivity test (MAT) and imaging secondary ion mass spectrometry (SIMS). The results of SIMS imaging are consistent with cracking activity data and show that the La/spinel is a superior vanadium trap for the fluid catalytic cracking of hydrocarbons (FCC) operation. La/spinel serves as a dual function additive for both vanadium trap and SO x removal. The optimum amount of La/spinel added to the cracking catalyst is about 15% by weight. This results in an increased catalytic activity, an increase in gasoline yield, and a decrease in coke and gas factors. The MgAl 2 O 4 phase of Mg/Al 2 O 3 additive is found capable of trapping vanadium while its MgO of Mg/Al 2 O 3 phase can migrate to zeolite particles (the active component of the FCC catalyst) that, in turn, causes a decline in the activity of that catalyst.