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As a fundamental investigation to develop catalytic coal gasification process, the quantitative evaluation was carried out on the catalytic activities of sea water and chemical compounds of Na, Ba, Fe and Ni, which were reported to be promising in many previous papers, added over porous pure carbon prepared by thermal decomposition of copolymer of PVDC (70%) and PVC (30%), and over the five kinds of chars prepared from lignite and sub-bituminous coals.<BR>Another subject was to examine the poisonous tolerance of these catalysts for low level (100-400ppm) H<SUB>2</SUB>S and COS, which were generally produced from sulfur compounds in coal matrix, mixed with gasifying agent of H<SUB>2</SUB>O (24%)-N<SUB>2</SUB>, H<SUB>2</SUB>O (24%)-H<SUB>2</SUB> (5-50%)-N<SUB>2</SUB> and CO<SUB>2</SUB> (24%)-N<SUB>2</SUB> mixtures.<BR>Thermogravimetry was applied for the gasification runs at 850°C and 900°C at an atmospheric pressure to give the fractional gasification (f [-])-time (θ [min]) curves; which were available for determination of parameters, a and b, in our modified volume reaction model equation, f=1-exp (-aθ<SUP>b</SUP>), to calculate the specific rate of gasification k=a<SUP> (1/b) </SUP>. b (-1n (1-f)) <SUP> (b-1) /b</SUP>, [g/g (daf) ·Emin] and an average rate constant, k=∫<SUP>1</SUP><SUB>0</SUB> kdf_??_∫<SUP>0.99</SUP><SUB>0.01</SUB>kdf_??_k (f=0.5), [1/min] useful as a numerical index of representative reactivity of the f-θ curve.<BR>Principal conclusions were as follows:<BR>1) Porous pure carbon and Taiheiyo coal char catalyzed with Fe and Ni: coexisting of H<SUB>2</SUB>S in gasifying agent had almost no effect on the rate of gasification with steam, but it lost the catalytic rate promotion effect on the gasification with steam-hydrogen mixture. The deactivation of catalyst with H<SUB>2</SUB>S were reversible, and owed to blocking of the catalytic reaction cycle between metal (Fe, Ni) and metal oxide (Fe<SUB>1-y</SUB>O, NiO) by sulfidation of the metal. The deactivation potential of COS was close to that of H<SUB>2</SUB>S.<BR>2) Porous pure carbon catalyzed with Ba and pretreated with sea water and NaC1 aq. solution: no significant influence was found on the rate of gasification with steam and steam-hydrogen mixture by coexisting of H<SUB>2</SUB>S in the gasifying agent.<BR>3) The rate promotion found in the gasification of coal char catalyzed with Ba with steam-hydrogen mixture depended on the parent coal. The rate depression by coexisting of H<SUB>2</SUB>S in this gasification system was also strongly dependent on the parent coal, and seemed to be related with total iron content of the sample char.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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