Open AccessCracking of the paraffins on catalysts from natural zeolite of Kazakhstan Shankanay field
Author(s) -
Lazat U. Krebayeva,
Zhannur D. Algabas,
Akerkem N. Еssenbayeva,
Alexandr R. Brodskyi,
Sapargali R. Konuspayev
Publication year - 2021
Publication title -
habaršy - a̋l-farabi atyndag̣y k̦azak̦ memlekettik ụlttyk̦ universiteti. himiâ seriâsy/chemical bulletin of kazakh national university
Language(s) - English
Resource type - Journals
eISSN - 2312-7554
pISSN - 1563-0331
DOI - 10.15328/cb1154
Subject(s) - zeolite , catalysis , fluid catalytic cracking , chemistry , cracking , clinoptilolite , hydrochloric acid , selectivity , nuclear chemistry , chemical engineering , inorganic chemistry , organic chemistry , engineering
Cracking of paraffins was held to obtain long chain α-olefins using the catalysts from natural zeolite of Shankanay field modified with 1N HCl at the temperature range of 500-570°С and atmospheric pressure on a fixed layer. Liquid and gaseous reaction products were analyzed by gas chromatography; regeneration of the catalyst was carried out with a steam-air mixture until total absence of CO2 in the contact gases. To evaluate the structure and texture of the obtained catalysts, the methods of Mössbauer spectroscopy, X-Ray diffractometry analysis, and elemental analysis using scanning electron microscopy were used. As results, zeolite modification allowed doubling the activity of the catalysts and increasing the selectivity by 23.8-44.8%. The group compositions of olefins, alkanes and gaseous products were detected. Iron form under α-Fe2O3, ε-FeOOH and γ-FeOOH was present. The modified and blank form of catalysts under 1N hydrochloric acid solution washing phase content was detected; partial destruction of the crystalline carcass of clinoptilolite was observed.