Catalytic decomposition of lower hydrocarbons to produce carbon oxides free hydrogen and bamboo shaped carbon nanotubes

Patent metadata

Field	Value
Publication number	US-10010874-B2
Application number	US-201314893643-A
Country	US
Kind code	B2
Filing date	Jul 23, 2013
Priority date	May 24, 2013
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

In accordance with the present subject matter there is provided a process for catalytic decomposition of lower hydrocarbons to produce carbon oxides free hydrogen and bamboo shaped carbon nanotubes over a catalyst composition. The process for catalytic decomposition of lower hydrocarbons comprises contacting lower hydrocarbon over a catalyst composition, where the catalyst composition comprising, a catalyst, at least one modifying agent and a support material.

First claim

We claim:

1. A catalyst composition comprising:
a catalyst in an amount in a range of 60% to 70% w/w of a total weight of the composition, the catalyst being selected from the group consisting of Ni, Co, and Fe;
at least one first modifying agent in an amount in a range of 3% to 7% w/w of the total weight of the composition, the first modifying agent being selected from the group consisting of Cu, oxides of Cu, and mixtures thereof;
at least one second modifying agent in an amount in a range of 3% to 7% w/w of the total weight of the composition, the second modifying agent being selected from the group consisting of Zn, oxides of Zn, and mixtures thereof; and
a support material in an amount in a range of 20% to 40% w/w of the total weight of the composition.

2. The catalyst composition as claimed in claim 1 , wherein the support material is selected from the group consisting of alumina, zirconia, titania, silica, niobia, zeolites, MCM-22, mesoporous oxides and microporous oxides.

3. The catalyst composition as claimed in claim 1 , wherein the catalyst composition is 60% w/w Ni, 5% w/w Cu, 5% w/w Zn, and 30% w/w Al 2 O 3 .

4. The catalyst composition as claimed in claim 1 , wherein the support material is selected from the group consisting of Al 2 O 3 , SiO 2 , and MCM-22.

5. The catalyst composition as claimed in claim 1 , wherein the catalyst composition is capable of catalyzing decomposition of lower hydrocarbons to produce carbon oxides-free hydrogen and carbon nanotubes.

6. The catalyst composition as claimed in claim 5 , wherein the lower hydrocarbons are selected from the group consisting of methane, ethane, and mixtures thereof.

7. A catalyst composition comprising:
a catalyst in an amount in a range of 50% to 70% w/w of a total weight of the composition;
at least one first modifying agent in an amount in a range of 3% to 7% w/w of the total weight of the composition, the first modifying agent being selected from the group consisting of Cu, oxides of Cu, and mixtures thereof;
at least one second modifying agent in an amount in a range of 3% to 7% w/w of the total weight of the composition, the second modifying agent being selected from the group consisting of Zn, oxides of Zn, and mixtures thereof; and
a γ-alumina support material in an amount in a range of 20% to 40% w/w of the total weight of the composition.

8. The catalyst composition as claimed in claim 7 , wherein:
the catalyst is selected from the group consisting of Ni, Co, and Fe.

9. The catalyst composition as claimed in claim 7 , wherein the catalyst composition is 60% w/w Ni, 5% w/w Cu, 5% w/w Zn, and 30% w/w γ-alumina.

10. A process for producing a catalyst composition comprising a catalyst in an amount in a range of 10% to 70% w/w of a total weight of the composition, at least one modifying agent in an amount in a range of 1% to 14% w/w of the total weight of the composition, and a support material in an amount in a range of 20% to 70% w/w of the total weight of the composition, the process comprising:
dissolving at least two salts selected from the group consisting of Ni, Co, Fe, Cu, and Zn in water to obtain a solution;
adding a support material to the solution to obtain a paste;
drying the paste at a temperature of 120° C. for a period of 1 h to 48 h to obtain a dried paste;
calcining the dried paste at a temperature range of 400° C.-600° C. for a period of 1 h to 6 h to obtain a precursor catalyst; and
reducing the precursor catalyst by hydrogen and in the presence of nitrogen in a temperature range of 380° C.-450° C. for a period of 1 h to 6 h to obtain a catalyst composition.

11. The process as claimed in claim 10 , wherein salts of Ni are selected from the group consisting of nickel nitrate, nickel chloride, nickel formate, nickel acetate, and nickel carbonate.

12. The process as claimed in claim 10 , wherein salts of Co are selected from the group consisting of cobalt nitrate, cobalt chloride, cobalt formate, cobalt acetate, and cobalt carbonate.

13. The process as claimed in claim 10 , wherein salts of Fe are selected from the group consisting of iron nitrate, iron chloride, iron formate, iron acetate, and iron carbonate.

14. The process as claimed in claim 10 , wherein salts of Cu are selected from the group consisting of copper nitrate, copper hydroxide, copper carbonate, and copper acetate.

15. The process as claimed in claim 10 , wherein salts of Zn are selected from the group consisting of zinc acetate, zinc hydroxide, zinc formate, zinc carbonate, and zinc nitrate.

16. The process as claimed in claim 10 , wherein the support material is selected from the group consisting of alumina, zirconia, titania, silica, niobia, zeolites, MCM-22, mesoporous oxides and microporous oxides.

17. The process as claimed in claim 10 , wherein the catalyst composition is a mixed oxide with meso or micro pores with nano or microsize of metal (NiO) particles.

18. The process as claimed in claim 10 , wherein the catalyst composition is 60% w/w Ni, 5% w/w Cu, 5% w/w Zn, and 30% w/w Al 2 O 3 .

19. The process as claimed in claim 10 , wherein the support material is selected from the group consisting of Al 2 O 3 , SiO 2 , and MCM-22.

Assignees

• Hindustan Petroleum Corp Ltd
• Indian Institute Tech Delhi
• Centre For High Tech Cht
• Indian Institute Of Tech Iit Delhi

Inventors

• Pant Kamal Kishore
• Saraswat Sushil Kumar
• Tompala Annaji Rajiv Kumar
• Ramesh Kanaparthi
• Peddy Venkata Chalapathi Rao
• Nettem Venkateswarlu Choudary
• Gandham Sri Ganesh

Classifications

• C01B3/26

  using catalysts · CPC title

• B01J21/04

  Alumina · CPC title

• B01J37/18

  with gases containing free hydrogen · CPC title

• C01B2202/34

  Length · CPC title

• C01B32/17

  Purification · CPC title