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Title: Crystalline mesoporous zirconia catalysts having stable tetragonal pore wall structure

Abstract

Methods are disclosed for the preparation of new sulfated mesoporous zirconia materials/catalysts with crystalline pore walls of predominantly tetragonal crystal structure, characterized by nitrogen physical sorption measurement, X-ray diffraction, transmission electron microscopy and catalytic tests using n-butane isomerization to iso-butane and alkylation of 1-naphthol with 4-tert-butylstyrene as probe reactions. Sulfate deposition is preferred for the transformation of a mesoporous precursor with amorphous pore walls into a material with crystalline pore walls maintaining the mesoporous characteristics. 17 figs.

Inventors:
;
Publication Date:
Research Org.:
Northwestern University
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
672485
Patent Number(s):
US 5,786,294/A/
Application Number:
PAN: 8-644,359
Assignee:
Northwestern Univ., Evanston, IL (United States) PTO; SCA: 400201; 020400; PA: EDB-98:120403; SN: 98002024805
DOE Contract Number:
FG02-87ER13654
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 28 Jul 1998
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 02 PETROLEUM; ZIRCONIUM OXIDES; CATALYSTS; CHEMICAL PREPARATION; PORE STRUCTURE; BUTANE; ISOMERIZATION; NAPHTHOLS; ALKYLATION; CATALYTIC EFFECTS

Citation Formats

Sachtler, W.M.H., and Huang, Y.Y. Crystalline mesoporous zirconia catalysts having stable tetragonal pore wall structure. United States: N. p., 1998. Web.
Sachtler, W.M.H., & Huang, Y.Y. Crystalline mesoporous zirconia catalysts having stable tetragonal pore wall structure. United States.
Sachtler, W.M.H., and Huang, Y.Y. 1998. "Crystalline mesoporous zirconia catalysts having stable tetragonal pore wall structure". United States. doi:.
@article{osti_672485,
title = {Crystalline mesoporous zirconia catalysts having stable tetragonal pore wall structure},
author = {Sachtler, W.M.H. and Huang, Y.Y.},
abstractNote = {Methods are disclosed for the preparation of new sulfated mesoporous zirconia materials/catalysts with crystalline pore walls of predominantly tetragonal crystal structure, characterized by nitrogen physical sorption measurement, X-ray diffraction, transmission electron microscopy and catalytic tests using n-butane isomerization to iso-butane and alkylation of 1-naphthol with 4-tert-butylstyrene as probe reactions. Sulfate deposition is preferred for the transformation of a mesoporous precursor with amorphous pore walls into a material with crystalline pore walls maintaining the mesoporous characteristics. 17 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1998,
month = 7
}
  • Methods for the preparation of new sulfated mesoporous zirconia materials/catalysts with crystalline pore walls of predominantly tetragonal crystal structure, characterized by nitrogen physisorption measurement, X-ray diffraction, transmission electron microscopy and catalytic tests using n-butane isomerization to iso-butane and alkylation of 1-naphthol with 4-tert-butylstyrene as probe reactions. Sulfate deposition is preferred for the transformation of a mesoporous precursor with amorphous pore walls into a material with crystalline pore walls maintaining the mesoporous characteristics.
  • Highly crystalline metal oxide-carbon composites, as precursors to thermally stable mesoporous metal oxides, are coated with a layer of amorphous carbon. Using a `one-pot` method, highly crystalline metal oxide-carbon composites are converted to thermally stable mesoporous metal oxides, having highly crystalline mesopore walls, without causing the concomitant collapse of the mesostructure. The `one-pot` method uses block copolymers with an sp or sp 2 hybridized carbon containing hydrophobic block as structure directing agents which converts to a sturdy, amorphous carbon material under appropriate heating conditions, providing an in-situ rigid support which maintains the pores of the oxides intact while crystallizing atmore » temperatures as high as 1000 deg C. A highly crystalline metal oxide-carbon composite can be heated to produce a thermally stable mesoporous metal oxide consisting of a single polymorph.« less
  • This patent describes a process for treating automotive exhaust gases with a washcoated ceramic or metal monolith automotive exhaust catalyst. The washcoat on the catalyst has a thickness in the range of 30-80 microns, a total pore volume in the range of 0.60-1.80 cm/sup 3//g washcoat, a micropore volume in the range of 0.35-0.60 cm/sup 3//g washcoat, a micropore radium below 60 Angstrom units, and a surface area between 125-250 m/sup 2//g washcoat.
  • Hydrotreating catalysts are made on supports having a core of alumina having predominantly micropore structure, surrounded by a rind of different alumina having at least 25% of total pore volume in macropores. The catalyst support material is impregnated with catalytic metals, e.g. molybdenum with cobalt or nickel or both. The rind captures metals removed from the oils being treated to prevent deactivation of the core by such metals.
  • This patent describes a catalyst support having a bidisperse micropore size distribution where the micropores have an average pore diameter of less than 600 Angstrom units and being adapted for use as a hydrotreating catalyst support for treating heavy feeds containing large metal bearing molecules comprising a refractory oxide formed particle made of two different micropore size materials having: (a) one small pore material being characterized as having a small micropore region having an average pore diameter of less than 100 Angstrom units; and (b) another material being characterized as having a large micropore region having an average pore diametermore » (i) which is less than 600 Angstrom units, (ii) which is equal to or larger than 100 Angstrom units, and (iii) which is much larger than the average diameter of the metal bearing molecules in a heavy feed to be processed; the pore volume of the large micropore region comprising 10 to 90% of the total pore volume; and the pore volume of the small micropore region comprising 10 to 90% of the total pore volume.« less