Nanostructured titania catalyst with stabilized acidity and process thereof

Patent metadata

Field	Value
Publication number	US-10456773-B2
Application number	US-201414496424-A
Country	US
Kind code	B2
Filing date	Sep 25, 2014
Priority date	Sep 25, 2013
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

The present invention is directed to a process for obtaining a nanostructured titania catalyst with stabilized acidity through the sol-gel method and hydrotreatment and thermal activation; constituted basically by titanium oxide, specially characterized of being as nanostructures in its evolution nanocrystals-nanotubes-nanocrystals, that gives special physicochemical properties such as high specific area, purity and phases stability, acidity stability and different types of active acid sites, such as a capacity to disperse and stabilize metallic particles with high activity mainly in catalytic processes.

First claim

What is claimed is:

1. A nanostructured titania catalyst with stabilized acidity comprising titanium dioxide nanocrystals having crystalline/amorphous phase containing hydrogen titanate and a hydrogen titanate/anatase combination,
wherein said catalyst is obtained by a process including a sol-gel method step to obtain hydrogen titanate nanocrystals, a hydrotreatment step of the hydrogen titanate nanocrystals to obtain titanium dioxide nanotubes, and thermal activation step to convert at least a portion of the resulting titanium dioxide nanotubes to titanium dioxide nanocrystals,
wherein said thermal activation step is at a temperature of 100-350° C. and said catalyst comprises titanium dioxide nanocrystals having crystalline/amorphous phase containing 95-100 wt % of hydrogen titanate and further containing combination of 96 wt % of hydrogen titanate and 4 wt % of anatase; or
wherein said thermal activation step is at a temperature of 350-600° C. and said catalyst comprises titanium dioxide nanocrystals having crystalline/amorphous phase containing 20-33 wt % of hydrogen titanate and further containing combination of 22 wt % of hydrogen titanate and 78 wt % of anatase.

2. A nanostructured titania catalyst with stabilized acidity according to claim 1 , wherein said catalyst has internal, external and interlaminar diameter ranges as follows:

Dimensions of the external diameters (De), internal diameters

(D i ) and interlaminar diameters (E i ) of the TNT-IMP

nanostructured titania catalysts

Hydrogen titanates

Activation
(nm)

Temperature
General/(Preferable)

(° C.)
D e
D i
E i

100-350
 8-10
4-6
0.6-0.8

(8-9)
(5-6)
(0.6-0.7)

350-600
5-7
 2-17
0.1-0.2

(5-6)
(1.5-2)  
(0.06-01).  

3. A nanostructured titania catalyst with stabilized acidity according to claim 2 , wherein said catalyst has the following texture properties:

Surface
Average Pore

Activation
area
Diameter

Temperature
(m 2 /g)
(A)

(° C.)
General
Preferable
General
Preferable

100-350
320-350
330-340
20-55
30-40

350-600
200-280
260-270
20-30
 20-25.

4. A nanostructured titania catalyst with stabilized acidity according to claim 3 wherein said catalyst has the following properties of the bandgap energy (Eg):

Values of the bandgap energy (Eg) of the nanostructures

of the TNT-IMP semiconductor material

Activation
Bandgap energy (Eg)

Temperature
(eV)

(° C.)
General
Preferable

100-350
2.83-3.80
2.83-2.85

350-600
2.90-3.95
 2.90-2.93.

5. A nanostructured titania catalyst with stabilized acidity according to claim 4 , wherein said catalyst has the following hydroxylation grades:

Hydroxylation grade of catalyst at different

activation temperatures:

Activation
Hydroxylation

temperature (°)
grade*

300
9.133-12.011

600
4.933-5.669 

600
0.99779

*Deconvolutions determined at 300° C.

Assignees

• Mexicano Inst Petrol
• Inst Mexicano Del Peltroleo

Inventors

• Castillo Cervantes Salvador
• Mejia Centeno Isidro
• Marin Cruz Jesus
• Galicia Gómez Policarpo
• Camposeco Solis Roberto

Classifications

• B01J37/06

  Washing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J23/30

  Tungsten · CPC title

• B01J21/063 Primary

  Titanium; Oxides or hydroxides thereof · CPC title

• B01J37/036

  to form a gel or a cogel · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title