A method for separating a carbon material from catalyst in a carbon generation process, such as a CARGEN process, is provided. The method includes preparing a solution, mixing the solution with both carbon and the catalyst to form a supernatant mixture and a precipitate, and filtering the supernatant mixture from the precipitate.

A method of preparing synthetic oil, the method including producing synthetic gas by introducing the feed into a synthetic gas production reaction in the presence of a catalyst, producing synthetic oil and an FT tail gas by introducing the synthetic gas into a Fischer-Tropsch (FT) reaction, regenerating the catalyst used in the producing of the synthetic gas in a catalyst regenerator, and supplying the FT tail gas to a catalyst regenerator.