Conversion of wastewater containing organic compoundes to hydrogen and methane by the hydrothermal gasification using novel Ni/Carbon catalyst

使用新型镍/碳催化剂通过水热气化将含有机化合物的废水转化为氢气和甲烷

• 批准号: 14205116
• 负责人: MIURA Kouichi
• 金额: $ 26.62万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205116/
• 关键词: wastewater treatment; Ni-loaded carbon catalyst; hydrothermal gasification; energy recovery; ion exchange resin

A novel Ni/carbon catalyst could be prepared through the carbonization of methacrylic ion exchange resin, which was treated in an aqueous solution of nickel sulfate using NH3 to keep pH at near neutral. The properties of this catalyst are as follows ; Ni content 47 wt%, Particle size of Ni 2〜4 nm, BET surface area 180 m2/g. This catalyst was used for the gasification of water-soluble organic compounds under hydrothermal conditions at 200〜350℃. Acetic acid and sucrose were completely gasified at 300℃, producing methane, hydrogen and carbon dioxide. Aromatic compounds such as benzene are also gasified at 350℃, yielding large amount of hydrogen. The yield of hydrogen surprisingly reached 2.8 mol/mol-C for toluene.Two real wastewaters were used in this study. One is a wastewater from dewatering process of brown coal through hydrothermal treatment. The other is an industrial wastewater from electronic factory. Organic compounds containing in the both wastewaters were completely converted to gaseous product at 300℃. It was found that this catalyst can be used for treating real wastewaters. The product gas contained fairly large amount of combustible gas (CH4 and H2) especially for industrial wastewater. This industrial wastewater was also used for the long-run experiment to examine the life of the catalyst. This catalyst kept complete gasification for 2000 hours when no substances promoting the sintering of Ni particles contained in the wastewater. This result indicates that this catalyst has enough durability for practical use. The energy balance of this proposed process was examined. It was found that 52 % of energy can be recovered as fuel gas from the organic compounds in the wastewater when the heat of exit stream of the reactor was recovered by the heat exchange with the feed steam. This result clearly indicates that this proposed process is promising not only for the wastewater treatment but also for the recovery of energy from wastewater.

将甲基丙烯酸型离子交换树脂在硫酸镍水溶液中用NH3处理，使pH值保持在近中性，通过碳化反应制备了一种新型的Ni/C催化剂。该催化剂的性能如下：Ni含量47wt%，Ni颗粒尺寸2 ~ 4 nm，BET表面积180 m2/g。该催化剂用于水溶性有机物在200 ~ 350℃水热条件下的气化。醋酸和蔗糖在300℃下完全气化，产生甲烷、氢气和二氧化碳。苯等芳香族化合物在350℃时也会气化，产生大量的氢气。对于甲苯，氢气的产率令人惊讶地达到2.8mol/mol-C。一种是褐煤水热脱水废水。另一种是电子厂的工业废水。两种废水中的有机物在300℃时均完全转化为气态产物。结果表明，该催化剂可用于处理真实的废水。产物气中含有大量的可燃气体（CH 4和H2），特别是对于工业废水。该工业废水还用于长期运行实验以检查催化剂的寿命。该催化剂在没有促进废水中所含Ni粒子烧结的物质的情况下保持完全气化2000小时。该结果表明该催化剂具有足够的耐久性以用于实际应用。对该工艺的能量平衡进行了研究。结果表明，当反应器出口流的热量通过与进料蒸汽的热交换回收时，可以从废水中的有机化合物中回收52%的能量作为燃料气体。这一结果清楚地表明，该方法不仅适用于废水处理，而且适用于从废水中回收能量。

项目成果

Hydrothermal treatment of brown coal for upgrading and the treatment of its wastewater using catalytic hydrothermal gasification to recover fuel gas

褐煤水热处理提质及其催化水热气化废水处理回收燃气

• 发表时间: 2004
• 期刊: Fuel 83
• 作者: Nakagawa H;Namba A;Boehlmann M;Miura K
• 通讯作者: Miura K

Nakagawa H, Namba A, Beohlmann M, Miura K: "Hydrothermal treatment of brown coal for upgrading and the treatment of its wastewater using catalytic hydrothermal gasification to recover fuel gas"Fuel. 83(6). 713-725 (2004)

Nakakawa H、Namba A、Beohlmann M、Miura K：“对褐煤进行水热处理以进行升级，并使用催化水热气化来回收燃气来处理其废水”燃料。

A novel nickel/carbon catalyst for CH4 and H2 production from organic compounds dissolved in wastewater by catalytic hydrothermal gasification

• DOI: 10.1016/j.fuel.2005.04.035
• 发表时间: 2006
• 期刊: Fuel
• 影响因子: 7.4
• 作者: A. Sharma;H. Nakagawa;K. Miura