Studies on the Thermochemical Cycle for Heat/Chemical Energy Conversion by a hybrid use of Natural Gas/Unutilized Heat

天然气/余热混合利用热/化学能转换的热化学循环研究

基本信息

批准号：
10558072
负责人：
KODAMA Tatsuya
金额：
$ 4.35万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10558072/
关键词：
Concentrated Solar heat Natural Gas Solar Fuel Methane Reforming Methane Coupling Energy Conversion Water Decomposition Catalyst エネルギー転換率金属酸化物熱化学サイクル

项目摘要

Thermochemical redox Cycles for converting methane to calorie-upgraded chemical fuels of H_2, CO and C_2-hydrocarbon were investigated for the purpose of efficiently converting unutilized heat, such as concentrated solar heat, to chemical fuels below 1273 K.The following thermochemical cycles using a metal-oxide redox system were examined.1. Methane reforming/Water Decomposition CycleCH_4+M_xO_y→M_xO_<y-m-n-1>+(1-n)CO+nCO_2+(2-m)H_2+mH_2OM_xO_<y-m-n-1>+(m+n+1)H_2O→M_xO_y+(m+n+1)H_2The reactive working materials of WO_3/ZrO_2 and Ni_<0.39>Fe_<2.61>O_4/ZrO_2 were prepared for this redox cycle. Especially, the cycle using Ni_<0.39>Fe_<2.61>O_4/ZrO_2 could be repeated below 1173K, yielding 40-60% methane conversion. The syngas produced in the first reaction step has a H_2/CO molar ratio of about two, which is suitable for methanol production. Also almost pure hydrogen was obtained in a separate second step.2. Methane Coupling/Water Decomposition Cycle2CH_4+M_xO_y→M_xO_<y-2>+C_2H_4+2H_2OM_xO_<y-2>+2H_2O→M_xO_y+2H_2The reactive working material of SnO_2/Fe_3O_4/SiO_2 was prepared for this cycle. methane was also highly selectively converted to C_2-hydrocargon and H_2 by a single-step reaction mode of co-feeding methane and steam over SnO_2/Fe_3O_4/SiO_2 at 1173K.In comparison with earlier studies on methane coupling using steam as an oxidant, our experimental data gave the higher C_2-formation rate with a high C_2-selectivity.

研究了将甲烷转化为 H_2、CO 和 C_2-碳氢化合物的热量升级化学燃料的热化学氧化还原循环，目的是将未利用的热量（例如集中的太阳热）有效地转化为低于 1273 K 的化学燃料。以下热化学循环使用对金属氧化物氧化还原体系进行了研究。 1．循环CH_4+M_xO_y→M_xO_<y-m-n-1>+(1-n)CO+nCO_2+(2-m)H_2+mH_2OM_xO_<y-m-n-1>+(m+n+1)H_2O→M_xO_y+(m+n+1) H_2WO_3/ZrO_2和的反应工质为该氧化还原循环制备了Ni_<0.39>Fe_<2.61>O_4/ZrO_2，特别是，使用Ni_<0.39>Fe_<2.61>O_4/ZrO_2的循环可以在1173K以下重复，产生40-60%的甲烷转化率。第一步反应生成的H_2/CO摩尔比约为2，适合甲醇在单独的第二步中也获得了几乎纯的氢气。2CH_4+M_xO_y→M_xO_<y-2>+C_2H_4+2H_2OM_xO_<y-2>+2H_2O→M_xO_y+2H_2的反应工质。为此制备了SnO_2/Fe_3O_4/SiO_2通过在SnO_2/Fe_3O_4/SiO_2上于1173K共进甲烷和水蒸气的单步反应模式，甲烷也被高选择性地转化为C_2-烃和H_2。，我们的实验数据给出了更高的 C_2 形成率和高 C_2 选择性。