Nickel based catalyst using hydrotalcite-like precursor and steam reforming reaction of LPG
The present invention relates to a nickel-based catalyst using hydrotalcite-like precursor and a steam reforming reaction by using the catalyst, and particularly to a nickel-based catalyst prepared by dispersing nickel uniformly onto the inner part and the surface of the support through a substitution between the magnesium and the active nickel metal and optimizing the molar ratios of nickel, magnesium and aluminum in order to utilize nickel as an active metal and a hydrotalcite-like precursor consisting of aluminum and magnesium, which shows an increased specific surface area of the catalyst and surface area of the active nickel, and thus enables the production of hydrogen-rich gas in high yield during the steam reforming reaction of LPG with superior maintenance of catalytic activity for a long period of time due to the inhibition of carbon deposition.
1. A nickel-based catalyst for steam reforming reaction of LPG prepared by impregnating a hydrotalcite precursor of Formula (I):
Ni x /Mg y Al (I)
wherein x and y are molar ratios of Ni and Mg, respectively, relative to Al; x is 0.25-1; y is 0.6-5.5; and x/y is 0.15-0.45, with 10-24 wt. % of active nickel, wherein the wt. % is relative to the nickel-based catalyst prepared.
2. The nickel-based catalyst of claim 1 , wherein the specific surface area of the catalyst is 100-300 m 2 /g and the surface area of the active ingredient, nickel, is 10-30 m 2 /g.
3. A process for steam reforming of LPG, which comprises the step of producing hydrogen-rich gas by performing steam reforming of LPG in the presence of a nickel-based catalyst of Formula (I) at a temperature of 700-950° C., a space velocity of 2,500-250,000 h −1 , and steam to carbon ratio of 1-4 to 1:
Ni x /Mg y Al (I)
wherein x and y are molar ratios of Ni and Mg, respectively, relative to Al; x is 0.25-1; y is 0.6-5.5; and x/y is 0.15-0.45.
4. The process of claim 3 , wherein the steam is used in an amount of 1-4 moles relative to one mole of carbon.
5. The process of claim 3 , wherein the LPG contains propane, butane and a mixture thereof.
6. The process of claim 5 , wherein propane and butane are contained in a volume ratio of 10-40:60-90.