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|Title: ||Catalytic membrane reactors for synthesis gas production from natural gas via partial oxidation.|
|Authors: ||Olsen, Susanne Kelly|
|Supervisors: ||Gobina, Edward|
|Issue Date: ||May-2004|
|Publisher: ||Robert Gordon University|
|Abstract: ||Natural gas obtained during the extraction of liquid hydrocarbons is often undesired
due to the lack of infrastructure to transport the natural gas to an onshore location.
As a result the natural gas is often flared causing economic waste and environmental
concern. It would therefore be desirable to either convert the natural gas into some
other substance which can be transported easily, or transport the natural gas in a
liquid state. In that way, new field development will be more financially viable through
the use of the extensive infrastructure and technology already in place in the offshore
industry for transporting liquid hydrocarbons.
It is considered that one feasible way of utilising offshore produced natural gas, is to
convert it into synthetic gas (syngas) which can in turn be used to produce gases and
fluids such as methanol, ammonia or a synthetic crude oil that can be readily pumped
through the same pipelines as the produced oil.
For the production of synthetic gas, membrane technology presents an attractive
advantage improving conversion efficiency by operating as catalyst support, which
then also increases the catalyst dispersion, resulting in optimal catalyst load and
complete consumption of oxygen and methane in the partial oxidation.
In the present investigation, an enhanced catalyst-dispersed ceramic membrane for
low-cost synthesis gas production suitable for gas-to-liquids has been prepared,
characterised and tested in a self-designed membrane reactor. The effect of
temperature and feed flow rates has been studied and a kinetic model has been
In the novel membrane reactor, an active porous layer is located on both sides facing
the oxygen and methane containing gas, adjacent is a second active porous layer
and is supported by layers with increasing pore radii. Here the active porous layer on
the bore side enhances the reaction between permeated oxygen and fuel species.
In this study, it has also been demonstrated that the oxygen is activated prior to
contacting the methane inside the membrane. This often results in 100% oxygen
conversion, CO selectivity higher than 96% and syngas ratio (1-1/2 C O) of 2.2 to 1.8.
Another advantage of the developed membrane system is that it can be used in high
temperatures (> 1273.15K) and high pressure (80bars) processes with no variation
on the flow rates, due to the mechanical strength of the ceramic support used.|
|Appears in Collections:||Theses (Engineering)|
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