Burn coal to make it, catalytic decomposition of methane, you get the hydrogen, where does the carbon go?

通过烧煤得到，催化分解甲烷，可以得到氢，碳去哪儿了？

麻省理工公开课 - 固态化学导论课程节选

Electrolysis of water, catalytic decomposition of hydrocarbons?

电解水，催化分解碳氢化合物？

麻省理工公开课 - 固态化学导论课程节选