Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1995-11-14
1999-03-16
Lewis, Michael
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502332, 502338, 502339, B01J 2340, B01J 2342, B01J 2344, B01J 2346
Patent
active
058830383
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to supported catalysts of the following formular (I) for producing ethylene which is used in basic reactions including polymerization, copolymerization and polycondensation reaction in the field of petrochemical industry and fine chemical industry, and preparation thereof.
Further, the present invention is to provide a new process for preparation of ethylene by converting directly methane or purified natural gas, in the presence of the above catalyst with nitrogen, at a temperature of about 670.degree. to 850.degree. C., preferably in the range of 710.degree. to 810.degree. C., which is distinctly lower reaction temperature relative to that of conventional synthesis of hydrocarbon(s) by dehydrogenation. By this process, ethylene is obtained in short time, with high yield, and without by-product such as CO, CO.sub.2, contrary to oxidative coupling reaction where oxygen is introduced.
In Ma'/S of above mentioned general formular (I), M is a compound selected from the group of RuCl.sub.2 (PPh.sub.3).sub.3, RuCl.sub.2 (CO).sub.2 (PPh.sub.3).sub.2, Ru.sub.3 (CO).sub.12, RhCl(CO)(PPh.sub.3).sub.2, IrCl(CO)(PPh.sub.3).sub.2, Pd(PPh.sub.3).sub.4, Pt(PPh.sub.3).sub.4, RuCl.sub.3 .multidot.xH.sub.2 O, RhCl.sub.3 .multidot.xH.sub.2 O, IrCl.sub.3 .multidot.xH.sub.2 O, PdCl.sub.2 .multidot.xH.sub.2 O, wherein x is 3-10, H.sub.2 PtCl.sub.6 .multidot.xH.sub.2 O, S is an inorganic carrier selected from .alpha.-Al.sub.2 O.sub.3, .gamma.-Al.sub.2 O.sub.3, SiO.sub.2, SiO.sub.2 --Al.sub.2 O.sub.3, Y-zeolite, MgO and TiO.sub.2, a' is weight percentage of metal in catalyst, ranging from 0.25 to 5 wt %.
BACKGROUND ART
Few of literatures and patents about the catalyst which can be used to produce ethylene by direct conversion of methane is disclosed; moreover, it is different in technical field from present invention. By conventional processes, large amounts of by-product such as carbon dioxide are produced, separation and removal thereof is difficult and environmental pollution is likely to be caused. Also, synthesis of hydrocarbon(s) by conventional dehydrogenation is conducted at relatively high temperature of about 1500.degree. to 1550.degree. C. through thermal or electric cracking reaction to cause some problems such as necessity of supply of high energy, expense of high temperature equipment (plan) as well as enormous loss of thermal energy expense, particulary severe corrosion of reactor.
As prior art describing synthesis of hydrocarbon by oxidative coupling or dehydrogenation reaction, there are U.S. Pat. Nos. 5,066,629, 5,068,486 and 5,118,654, Canadian patent no. 2016675 and Japanese patent nos. 04352730, 04368342.
SUMMARY OF THE INVENTION
Until now, new catalyst being able to conduct conversion reaction not at so (ultra) high temperature as that of process for synthesis of hydrocarbons by dehydrogenation but at distinctly lower (mid.cndot.low) temperature, and new process for producing said catalyst, and new process for conversion into ethylene using said catalyst have always been expected.
To meet the expectations above, as the result of study for years, the inventors completed development of a new catalyst, preparation thereof, and a simple process for obtaining ethylene in short time, with high yield and with trace amounts of impurities, by converting methane or purified natural gas in the presence of said catalyst at distinctly lower temperature compared to that of process for synthesis of hydrocarbon by dehydrogenation or oxidative coupling reaction; thus direct conversion of methane, being carried out at distinctly low temperature, causes to save enormous amount of thermal energy cost that was needed in synthesis reaction of hydrocarbon(s) by dehydrogenation or oxidative coupling reaction, and is sufficiently efficient to environmental pollution problems through reduced amounts of impurities, namely CO.sub.2.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in further detail with reference to Examples.
First, new desirabl
REFERENCES:
patent: 3981825 (1976-09-01), Reagan et al.
patent: 5077446 (1991-12-01), Kolts et al.
patent: 5105053 (1992-04-01), Jacobson et al.
Ahn Pyung Kwon
Park Dae Chul
Ghyka Alexander G.
Korea Research Institute of Chemical Technology
Lewis Michael
LandOfFree
Supported catalysts for converting methane or purified natural g does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Supported catalysts for converting methane or purified natural g, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supported catalysts for converting methane or purified natural g will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-817576