Porous catalytic object for decomposing hydrocarbon and process for producing same, process for producing hydrogen-containing mixed reformed gas from hydrocarbon, and fuel cell system

Abstract

Disclosed is a porous catalytic object for decomposing hydrocarbons which comprises a porous composite oxide and nickel metal having a particle diameter of 1-25 nm, the porous composite oxide at least containing magnesium and / or calcium and further containing aluminum, the porous catalytic object being characterized by having an average compressive strength of 5 kgf or higher and having a displacement length of 0.05 mm or longer when compressed at a load of 5 kgf. The porous catalytic object is less expensive as a porous catalytic object for decomposing hydrocarbons, has excellent catalytic activity with respect to the decomposition and removal of hydrocarbons, has excellent resistance to poisoning by sulfur, has high resistance to caulking even under low-steam conditions, has a compressive strength and a displacement length which render the object optimal for DSS operations, and has excellent durability.

Description

technical field [0001] The object of the present invention is to provide a catalyst which is cheaper as a porous catalytic body for decomposing hydrocarbons, exhibits excellent catalytic activity for the decomposition and removal of hydrocarbons, is excellent in resistance to sulfur poisoning, and has high resistance even under low steam. Gap filling (resistance to caulking), has the most suitable compressive strength and deformation length for DSS operation, and has excellent durability. [0002] Another object of the present invention is to efficiently decompose and remove hydrocarbons and produce hydrogen by using the catalyst described above. Background technique [0003] In recent years, due to the problems of the global environment, the early practical technology of new energy has attracted attention. As one of its methods, fuel cells are attracting attention. Depending on the type of electrolyte used in the fuel cell, phosphoric acid type (PEFC), molten carbonate ty...

AI Technical Summary

Problems solved by technology

[0013] Among precious metal elements such as Ru, although it is difficult to cause carbon precipitation even under the condition of low S / C (steam / carbon ratio), the sulfur component contained in the raw material is easy to poison the catalyst due to sulfuration, and the catalytic activity is between 1 and 2. short-term deterioration

Carbon precipitation is very easy to occur on the sulfur poisoned catalyst, and has the disadvantage that sulfur poisoning becomes the cause of carbon precipitation

In addition, because precious metals are expensive, the price of fuel cell systems using them is very high, which will become a major factor hindering the further popularization of fuel cell systems

[0014] In addition, because Ni, a non-precious metal element, is more likely to cause carbon precipitation, it needs to be used under the condition of a higher water vapor / carbon ratio than the theoretical composition with excess water vapor added. In addition to complicated operation, the steam gas consumption rate also increases. Uneconomical

In addition, the conditions under which the system can operate continuously are narrowed, and for continuous operation, not only an expensive control system is required, but also the entire system becomes very complicated, which is uneconomical in terms of manufacturing cost and maintenance

[0015] In the fuel cell system, due to the DSS operation (Daily Start-up and Shutdown: Daily Start-up and Shutdown), the stretching and expansion of the reactor caused by external heating, and the catalytic body is gradually densely filled, and the catalytic body is caused by these repetitions. the rupture

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