Kinetics for carbon deposit on nickel catalyst in CH{sub 4} reforming with CO{sub 2}
- Taiyuan Univ. of Technology (China). Lab. of Coal Conversion Science
The reaction of carbon deposition is a structure sensitivity reaction. In this paper, kinetics for carbon deposition on nickel catalyst in CH{sub 4} reforming with CO{sub 2} is studied by DTA technique. 15 nickel catalysts are selected as samples. Results show that there are three kinds of carbon deposited on the surface of nickel catalysts without rare-earth oxides as additive after reforming. By oxidation of nickel catalysts after reaction in air at 10K/min three different endothermic and exothermic peaks appeared at 700--900K, 873--950K and 950--1,200K accordingly. The authors defined the endothermic peak at 700--900K as C{sub {alpha}} oxidation, the endothermic peak at 873--950K as C{sub {beta}} oxidation and the exothermic peak at 950--1,023K as C{sub {gamma}} oxidation. The order of oxidation reaction of C{sub {alpha}}, C{sub {beta}} and C{sub {gamma}} is 1, 2 and 1. C{sub {alpha}} is made by the adsorption of CO{sub 2} on nickel catalyst and has higher reactivity. C{sub {beta}} and C{sub {gamma}} are mainly made by the dissociation of CH{sub 4} and C{sub {alpha}} is easily oxidized at lower temperature.
- OSTI ID:
- 324770
- Report Number(s):
- CONF-970931--
- Country of Publication:
- United States
- Language:
- English
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