Research output: Contribution to journal › Article › peer-review
Effects of Alkali Element Doping and Synthesis Conditions on the Genesis of the Phase Composition of Alumina–Chromium Catalysts. / Chesnokov, V. V.; Boldyreva, N. N.; Dovlitova, L. S. et al.
In: Kinetics and Catalysis, Vol. 60, No. 1, 01.01.2019, p. 96-105.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Effects of Alkali Element Doping and Synthesis Conditions on the Genesis of the Phase Composition of Alumina–Chromium Catalysts
AU - Chesnokov, V. V.
AU - Boldyreva, N. N.
AU - Dovlitova, L. S.
AU - Zyuzin, D. A.
AU - Parmon, V. N.
N1 - Publisher Copyright: © 2019, Pleiades Publishing, Ltd.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - The influence of modifying additives and synthesis conditions on the genesis of the phase composition of alumina–chromium catalysts was studied by differential dissolution (DD) and X-ray diffraction (XRD) analysis. The salts of potassium (KNO 3 ) and lithium (LiCl) were added as additives. It was found that the individual nature of the additives affected the formation of phases. Although potassium and lithium cations occur in the same group of the periodic system, they differently react with a phase of γ-Al 2 O 3 in the support: lithium forms a Li x Al 1 solid solution with the crystallized finely dispersed γ-Al 2 O 3 species, whereas potassium mainly remains on the surface of the finely dispersed Al 2 O 3 species and partially forms potassium aluminate. The interaction of lithium cations with the active component Cr(VI) of the catalyst leads to the formation of lithium chromate analogously to the reaction of the potassium cation with CrO 4 2- However, a portion of lithium cations is introduced into the structure of the substitution solid solution of Cr(III) in γ‑Al 2 O 3 to form addition solid solutions (Al 1 Cr x1 – x2 Li y1 – y2 ).
AB - The influence of modifying additives and synthesis conditions on the genesis of the phase composition of alumina–chromium catalysts was studied by differential dissolution (DD) and X-ray diffraction (XRD) analysis. The salts of potassium (KNO 3 ) and lithium (LiCl) were added as additives. It was found that the individual nature of the additives affected the formation of phases. Although potassium and lithium cations occur in the same group of the periodic system, they differently react with a phase of γ-Al 2 O 3 in the support: lithium forms a Li x Al 1 solid solution with the crystallized finely dispersed γ-Al 2 O 3 species, whereas potassium mainly remains on the surface of the finely dispersed Al 2 O 3 species and partially forms potassium aluminate. The interaction of lithium cations with the active component Cr(VI) of the catalyst leads to the formation of lithium chromate analogously to the reaction of the potassium cation with CrO 4 2- However, a portion of lithium cations is introduced into the structure of the substitution solid solution of Cr(III) in γ‑Al 2 O 3 to form addition solid solutions (Al 1 Cr x1 – x2 Li y1 – y2 ).
KW - alumina–chromium catalyst
KW - differential dissolution method
KW - modifying additives
KW - stoichiograms
KW - DEHYDROGENATION
KW - REACTOR
KW - CENTRIFUGAL THERMAL-ACTIVATION
KW - STOICHIOGRAPHIC ANALYSIS
KW - alumina-chromium catalyst
UR - http://www.scopus.com/inward/record.url?scp=85066009263&partnerID=8YFLogxK
U2 - 10.1134/S0023158419010026
DO - 10.1134/S0023158419010026
M3 - Article
AN - SCOPUS:85066009263
VL - 60
SP - 96
EP - 105
JO - Kinetics and Catalysis
JF - Kinetics and Catalysis
SN - 0023-1584
IS - 1
ER -
ID: 20162162