Catalyst for oxygen-free direct conversion of methane and method of converting methane using the same

Patent metadata

Field	Value
Publication number	US-11364487-B2
Application number	US-201816642774-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Jan 23, 2018
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

The present invention relates to a catalyst for oxygen-free direct conversion of methane and a method of converting methane using the same, and more particularly to a catalyst for oxygen-free direct conversion of methane, in which the properties of the catalyst are optimized by adjusting the free space between catalyst particles packed in a reactor, thereby maximizing the catalytic reaction rate without precise control of reaction conditions for oxygen-free direct conversion of methane, minimizing coke formation and exhibiting stable catalytic performance even upon long-term operation, and to a method of converting methane using the same.

First claim

What is claimed is:

1. A catalyst for oxygen-free direct conversion of methane, which is granulated and packed in a shaped catalyst body form in a reactor for oxygen-free direct conversion of methane,
wherein the catalyst satisfies Mathematical Formula 1 below:
( V inter /V void )≤0.4  [Mathematical Formula 1]

in Mathematical Formula 1, V void is V R −V A , V R is a volume of a catalyst-packed portion in the reactor, and V A is an apparent volume of the shaped catalyst body packed in the catalyst-packed portion, and V inter is an interparticle space volume of the shaped catalyst body packed in the catalyst-packed portion, and
wherein the catalyst comprises:
a catalyst carrier comprising silicon oxide; and
iron dispersed in a monoatomic form on the catalyst carrier.

2. The catalyst of claim 1 , wherein a ratio [(V void +V inter )/V R ] of V void and V inter to V R of the catalyst is 0.7 or less.

3. The catalyst of claim 1 , wherein a sum of V void and V inter of the catalyst is 0.7 ml/g cata. or less.

4. The catalyst of claim 1 , wherein the V inter of the catalyst is 0.2 ml/g cata. or less.

5. The catalyst of claim 1 , wherein an amount of iron that is supported is 0.1 wt % to 10.0 wt % based on a total weight of the catalyst.

6. The catalyst of claim 1 , wherein the catalyst carrier is in a crystalline molten state.

7. The catalyst of claim 1 , wherein the is decreased through repeated fusing and solidification.

8. A method of converting methane, comprising:
reacting methane in an anaerobic or oxygen-free atmosphere using the catalyst of claim 1 .

9. The method of claim 8 , wherein the reacting is carried out at a temperature of 950° C. to 1100° C.

Assignees

• Korea Res Inst Chemical Tech

Inventors

• Kim Yong Tae
• Kim Seok Ki
• Kim Hyun Woo
• Lee Sung Woo
• Han Seung Ju

Classifications

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• B01J35/40

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

• B01J35/50

  characterised by their shape or configuration · CPC title

• B01J37/04

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

• B01J23/745 Primary

  Iron · CPC title