The Influence of the Preparation of Zr(OH)4 Precursor on the Catalytic Performances of ZrO2/SO42- in the Isomerization of n-butane

2008 ◽  
Vol 59 (3) ◽  
pp. 292-296
Author(s):  
Mihaiela Ropot ◽  
Emilian Angelescu ◽  
Rodica Zavoianu ◽  
Rodica Birjega
Keyword(s):  
Catalytic Activity ◽  
Sulfated Zirconia ◽  
Sulfated Zirconia Catalysts ◽  
Catalytic Performances

In the preparation of sulfated zirconia catalysts, the properties of products, including catalytic activity, are influenced by the precursor from which Zr(OH)4 is obtained, by agents of precipitation and solvents. The most active catalysts for the isomerization of n-butane to izobutane was obtained from ZrCl4 precipitated with N2H4 . H2O and maturated, but a better selectivity was obtained when ZrOCl2�8H2O was using.

Surface features and catalytic activity of sulfated zirconia catalysts from hydrothermal precursors

2002 ◽  
Vol 4 (13) ◽  
pp. 3136-3145 ◽  
Author(s):  
C. Morterra ◽  
G. Cerrato ◽  
S. Ardizzone ◽  
C. L. Bianchi ◽  
M. Signoretto ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Sulfated Zirconia ◽  
Surface Features ◽  
Sulfated Zirconia Catalysts

Production of Nanocrystalline Sulfated Zirconia Catalysts via a Flow-Through Hydrothermal Process

1998 ◽  
Vol 520 ◽  
Author(s):  
D.W. Matson ◽  
J.G. Darab ◽  
T.D. Brewer ◽  
P.D. Kaviratna
Keyword(s):  
Catalytic Activity ◽  
Sulfated Zirconia ◽  
Hydrothermal Process ◽  
Gel Formation ◽  
Hydrothermal Conditions ◽  
Sulfate Content ◽  
Powder Formation ◽  
Flow Through ◽  
Sulfated Zirconia Catalysts ◽  
Zirconia Powders

ABSTRACTNanocrystalline sulfated zirconia catalysts were prepared using the rapid thermal decomposition of precursors in solution (RTDS) powder formation process. Zirconia gel formation, initial crystallization, and sulfate incorporation occurred during a brief exposure to hydrothermal conditions in the RTDS reactor. The partially crystalline zirconia solid was collected as a suspension, separated by centrifugation, and subjected to calcination to achieve full catalytic activity. Crystallinity, sulfate content, and catalytic activity of the calcined powders toward butane isomerization varied according to the hydrothermal conditions at which the zirconia powders were originally precipitated. The powders were characterized using powder XRD, FTIR, and XAS.

scholarly journals Content of sulfates and their stability: Key factors determining the catalytic activity of sulfated zirconia catalysts

2007 ◽  
Vol 72 (7) ◽  
pp. 679-686 ◽  
Author(s):  
Aleksandra Zarubica ◽  
Paula Putanov ◽  
Goran Boskovic
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Sulfated Zirconia ◽  
Preparation Method ◽  
Morphological Properties ◽  
Isomerization Reaction ◽  
Catalyst Precursor ◽  
Key Factors ◽  
Short Life ◽  
Sulfated Zirconia Catalysts

Two series of sulfated zirconia catalysts were synthesized from various precursors using mono- or multi-step sequence preparations under laboratory conditions. Their activities/selectivities in the isomerization reaction of n-hexane were correlated to their textural, structural and morphological properties. The slightly higher activity of a commercially sulfated Zr(OH)4-based catalyst is in agreement with the differences in the content of SO24 - ions and their thermal stability, textural and structural properties, i.e., crystallite size and possible imperfection of the incorporation of sulfate groups in the multi-step synthesis of the catalyst having a nitrate origin. The employment of H2 as the carrier gas resulted in no catalytic activity, regardless of the catalyst precursor, preparation method and calcination temperature. When the isomerization reaction was performed under He, the relatively short life-times of all catalyst samples were caused by fast deactivation due to coking in the absence of H2. .

The promotion of supported sulfated zirconia catalysts by iron and manganese sulfates

2021 ◽  
Vol 21 (3) ◽  
pp. 163-169
Author(s):  
M. D. Smolikov ◽  
L. I. Bikmetova ◽  
K. V. Kazantsev ◽  
I. V. Muromtsev ◽  
A. S. Belyi
Keyword(s):  
Catalytic Activity ◽  
Phase Composition ◽  
Aluminum Hydroxide ◽  
Distinctive Feature ◽  
Sulfated Zirconia ◽  
Acid Sites ◽  
Alumina Matrix ◽  
Sulfated Zirconia Catalysts ◽  
Iron And Manganese ◽  
High Octane

The study considers the effect of iron and manganese introduction on the textural characteristics and phase composition of the alumina matrix used as a support for sulfated zirconia catalysts in hexane isomerization. The additives introduced during plasticization of aluminum hydroxide essentially enhance the catalytic activity, which is expressed in terms of hexane conversion, and the selectivity of isomerization toward the formation of hexane isomers. The distinctive feature of the doped catalysts is the formation of acid sites with LAS/BAS ≥ 2, which promote an increase in the yield of isomers and particularly the yield of high-octane 2,2-dimethylbutane.

Isomerization ofn-butane on sulfated zirconia: Evidence for the dominant role of Lewis acidity on the catalytic activity

1994 ◽  
Vol 26 (3-4) ◽  
pp. 339-344 ◽  
Author(s):  
F. Pinna ◽  
M. Signoretto ◽  
G. Strukul ◽  
G. Cerrato ◽  
C. Morterra
Keyword(s):  
Catalytic Activity ◽  
Sulfated Zirconia ◽  
Dominant Role ◽  
Lewis Acidity
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