Methane rich city gas has been synthesized by means of steam retorming of naphtha; however, the produced gas always contains significant concentration of CO and CO2. Therefore, development of a methane production process containing no CO and CO2 removal processes is strongly requested. Authors reported in the previous paper that C3H8→2CH4+C(1) took place over Ni/SiO2 with 90% selectivity. In this paper, the catalyst supports were studied and found that neutral SiO2 and α-Al2O3 are suitable but the activity was much reduced over Ni supported on acidic SiO2-Al2O3. Catalyst was diluted by various materials to avoid blocking-up by the deposited carbon. Several diluted materials affected the conversion, α-Al2O3 and basic MgO accelerated the reaction which may be due to interaction between Ni and dilution materials with direct contact. Over Ni/SiO2, reaction (1) took place with 90% selectivity, so that the produced gas always contained H2 formed by the C3H8→3C+4H2(2). It has confirmed that H2 in a high concentration of CH4 can be reacted with C3H8 to produce CH4. From these results, a following simple synthesis process can be constituted; the first step is CH4, H2, and solid C formation from C3H8, and the second step is succeeding H2 consumption process of the produced gas in the first step.
|ジャーナル||Nippon Kagaku Kaishi / Chemical Society of Japan - Chemistry and Industrial Chemistry Journal|
|出版ステータス||出版済み - 1999|
!!!All Science Journal Classification (ASJC) codes
- 化学 (全般)