Hydrogen energy is the most promising source of sustainable energy under development. The decomposition of cellulose suspension for hydrogen production by using a 27.12 MHz in-liquid plasma was carried out at atmospheric pressure. Various types of reagents, such as 1 mol/dm 3 H2SO4, 1 mol/dm 3 NaOH and 0.333 mol/dm 3 Na2SO4, were used and compared as to the rate of gas production. Cellulose dispersed in acid liquids is decomposed indirectly by active radicals by the plasma. The highest hydrogen

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... production rate was obtained by employing 1 mol/dm 3 NaOH. The gasification rate of cellulose suspension was determined from the increase of C atoms in the product gas. When 1 mol/dm 3 NaOH was used, the rate was 7 times greater than that for pure water. It was found that carbon atoms in the product gas is indicative of the decomposition rate of the cellulose suspension. 水素エネルギーは,最も有望で持続可能な発展途中のエネルギーである。27.12 MHz の液中プラズマを用いたセルロース懸濁液 の分解が大気圧下で行われた。1 mol/dm 3 H2SO4,1 mol/dm 3 NaOH,0.333 mol/dm 3 Na2SO4 が溶媒として使用され,気体