Process for conversion of sulfur trioxide and hydrogen production

Patent metadata

Field	Value
Publication number	US-2021221683-A1
Application number	US-201716096785-A
Country	US
Kind code	A1
Filing date	Apr 27, 2017
Priority date	Apr 28, 2016
Publication date	Jul 22, 2021
Grant date	—

Abstract

The present disclosure relates to a process for decomposition of sulfuric acid, particularly a process for catalytically decomposing sulfuric acid, to obtain sulfur dioxide therefrom. In the present process, catalysts play a major role for improving the dissociation efficiency by lowering the activation energy barrier for the reaction.

First claim

1 . A process for conversion of sulphur trioxide to sulphur dioxide and oxygen comprising, the process comprising;
placing a catalyst composition in a reactor, wherein the catalyst composition comprises an active material selected from the group consisting of transitional metal oxide, mixed transitional metal oxide, and combinations thereof; and a support material selected from the group consisting of silica, titania, zirconia, carbides, and combinations thereof, wherein the active material to the support material weight ratio is in the range of 0.1 to 25 wt %; passing a flow of sulphur trioxide in the presence of an optionally used carrier gas over the catalyst composition at a temperature of 700° C.-900° C.; and recovering stream comprising of sulphur trioxide, sulphur dioxide, oxygen, water, and the optionally used carrier gas.

2 . The process as claimed in claim 1 , wherein the transitional metal is selected from the group consisting of Cu, Cr, and Fe.

3 . The process as claimed in claim 1 , wherein the active material is transitional metal oxide selected from the group consisting oxides of Cu, Cr, and Fe.

4 . The process as claimed in claim 1 , wherein the active material is mixed transitional metal oxide selected from the group consisting of binary oxide, a ternary oxide, and a spinel.

5 . The process as claimed in claim 1 , wherein the active material is an oxide of Cu.

6 . The process as claimed in claim 1 , wherein the active material is an oxide of Cr.

7 . The process as claimed in claim 1 , wherein the active material is an oxide of Fe.

8 . The process as claimed in claim 1 , wherein the active material is a binary oxide of Cu, and Fe in the molar ratio of 1:2.

9 . The process as claimed in claim 1 , wherein the active material is an oxide of Cu, and Fe with a spinel structure.

10 . The process as claimed in claim 1 , wherein the active material is an oxide of Cu, and Cr with a spinel structure.

11 . The process as claimed in claim 1 , wherein the support material has a pore volume in the range of 0.05 to 0.9 cc/g.

12 . The process as claimed in claim 1 , wherein the support material has active surface area in the range of 5-35 m 2 /g, specific surface area as determined by BET multipoint nitrogen absorption method is in the range of 2 to 200 m 2 /g, preferably 5 to 100 m 2 /g, more preferably 10 to 60 m 2 /g, (transitional metal content in the catalyst composition is in the range of 0.1 to 20 wt %, preferably 3 to 15 wt %) (size of catalyst is in the range of 0.1 to 15 mm, preferably in the range of 0.5 to 5 mm.

13 . The process as claimed in claim 1 , wherein the support material is crystallized porous β-SiC.

14 . The process as claimed in claim 1 , wherein the catalyst composition is used for decomposition of sulphuric acid.

15 . The process as claimed in claim 1 , wherein the catalyst composition is used for hydrogen production.

16 . The process as claimed in claim 1 , wherein the process comprises hydrogen production by splitting water into hydrogen and oxygen.

17 . The process as claimed in claim 1 , wherein the process comprises hydrogen production by splitting water into hydrogen and oxygen by a process selected from the group consisting of S-I cycle process, a Westinghouse cycle process, an Ispra-Mark 13 cycle process, and a Los Alamos science laboratory cycle process.

18 . A process as claimed in claim 16 for hydrogen production comprising placing a catalyst composition in a reactor, wherein the catalyst composition comprises an active material selected from the group consisting of transitional metal oxide, mixed transitional metal oxide and combinations thereof; and a support material selected from the group consisting of silica, titania, zirconia, carbides, and combinations thereof, wherein the active material to the support material weight ratio is in the range of 0.1 to 25 wt %;
passing a flow of sulphur trioxide in the presence of an optionally used carrier gas over the catalyst composition at a temperature of 700° C.-900° C.; and
recovering stream comprising of sulphur trioxide, sulphur dioxide, oxygen, water, and the optionally used carrier gas and splitting water into hydrogen and oxygen, wherein the process further comprises decomposing sulfuric acid into water, sulphur dioxide and oxygen though a reaction represented by the following formula (R1) and elementary reactions represented by the following formulae (R1-1) and (R1-2).

H
2



SO
4

→

H
2


O

+

SO
3

+

1
2



O
2

R1

H 2 SO 4 → H 2 O + SO 3
R1-1

SO
3



→
k





SO
2

+

1
2



O
2

R1-2.

Assignees

• Indian Institute Tech Delhi
• Ongc Energy Centre

Inventors

• Upadhyayula Sreedevi
• Bhaskarwar Ashok Niwritti
• Kondamudi Kishore
• Damaraju Parvatalu
• Bhargava Bharat
• Banerjee Satinath

Classifications

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J35/51

  Spheres · CPC title

• B01J23/866

  Nickel and chromium · CPC title

• C01B17/502 Primary

  of sulfur trioxide · CPC title

• B01J23/755

  Nickel · CPC title