Catalytic hydrocarbon dehydrogenation

Patent metadata

Field	Value
Publication number	US-11097257-B2
Application number	US-201916566801-A
Country	US
Kind code	B2
Filing date	Sep 10, 2019
Priority date	Sep 10, 2019
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A catalyst for dehydrogenation of hydrocarbons includes a support including zirconium oxide and Linde type L zeolite (L-zeolite). A concentration of the zirconium oxide in the catalyst is in a range of from 0.1 weight percent (wt. %) to 20 wt. %. The catalyst includes from 5 wt. % to 15 wt. % of an alkali metal or alkaline earth metal. The catalyst includes from 0.1 wt. % to 10 wt. % of tin. The catalyst includes from 0.1 wt. % to 8 wt. % of a platinum group metal. The alkali metal or alkaline earth metal, tin, and platinum group metal are disposed on the support.

First claim

What is claimed is:

1. A method of dehydrogenating hydrocarbons, the method comprising:
forming a catalyst comprising:
a support comprising zirconium oxide and L-zeolite, wherein a concentration of the zirconium oxide in the catalyst is in a range of from 0.1 weight percent (wt. %) to 20 wt. %;
from 5 wt. % to 15 wt. % of an alkali metal or alkaline earth metal in the catalyst, the alkali metal or alkaline earth metal disposed on the support;
from 0.1 wt. % to 10 wt. % of tin in the catalyst, the tin disposed on the support; and
from 0.1 wt. % to 8 wt. % of a platinum group metal in the catalyst, the platinum group metal disposed on the support;

applying pressure to the catalyst to form catalyst grains of about 200 micrometers (μm) to about 500 μm in size;
disposing the catalyst grains in a reactor;
subjecting hydrocarbons to be dehydrogenated to an operating temperature in a range of from about 500 degrees Celsius (° C.) to about 800° C. within the reactor, wherein the hydrocarbons to be dehydrogenated comprise n-pentane;
subjecting the hydrocarbons to be dehydrogenated to an operating pressure in a range of from about 0.01 bar to about 10 bar within the reactor; and
while subjecting the hydrocarbons to be dehydrogenated to the operating temperature and operating pressure within the reactor,
introducing a diluent gas to the hydrocarbons to be dehydrogenated, the diluent gas comprising hydrogen and inert gas.

2. The method of claim 1 , wherein the alkali metal or alkaline earth metal is selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, and barium.

3. The method of claim 2 , wherein the alkali metal is potassium or cesium.

4. The method of claim 2 , wherein a volume ratio of hydrogen to inert gas in the diluent gas is in a range of from 11:70 to 71:10.

5. The method of claim 2 , further comprising, before using the catalyst to dehydrogenate the hydrocarbons to be dehydrogenated, activating the catalyst, wherein activating the catalyst comprises:
placing the catalyst grains within the reactor;
flowing a stream comprising oxygen to the catalyst grains within the reactor; while flowing the stream comprising oxygen to the catalyst grains, increasing a temperature within the reactor to 450° C.;
after the temperature within the reactor reaches 450° C., flowing a stream comprising an inert gas to the catalyst grains within the reactor;
while flowing the stream comprising the inert gas to the catalyst grains, decreasing the temperature within the reactor to 400° C.;
after the temperature within the reactor reaches 400° C., flowing a stream comprising hydrogen to the catalyst grains within the reactor; and
adjusting the temperature within the reactor to the operating temperature.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Daous Mohammed Abdulmajeed
• Bahlouli Hussam A

Classifications

• B01J2229/42

  Addition of matrix or binder particles · CPC title

• B01J29/06 Primary

  Crystalline aluminosilicate zeolites; Isomorphous compounds thereof · CPC title

• C07C2521/06

  Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• B01J29/60

  of the type L, as exemplified by patent document US3216789 · CPC title

• B01J21/066

  Zirconium or hafnium; Oxides or hydroxides thereof · CPC title