Catalyst sintering problem hinders the development of effective supercritical water gasification (SCWG) at milder supercritical water (SCW) temperature for gas fuel production from wet biomass resources. Herein, we prepared a series of supported Ni catalysts by hydrothermal synthesis method particularly operated at the SCW region, and studied the activity and property stability of these newly developed catalysts for SCWG. Supporting materials studied for Ni include ZrO₂, Ce-promoted ZrO₂, Al₂O₃, Mg-promoted Al₂O₃, active carbon and carbon nanotube, and the supercritical water synthesis (SCWS) was conducted at 500 °C, 23 MPa in batch reactor using metallic nitrates as starting feed. SCWG results and catalyst characterization (XRD, SEM-EDS, N₂ adsorption/desorption and TGA) confirmed the high activity, superiorly stable crystalline structure and pore structure, and excellent regeneration ability of the SCWS-prepared catalysts (especially Ni/MgO-Al₂O₃) for SCWG reactions, showing that SCWS is a promising method to develop active and stable catalyst for SCWG process.

催化剂烧结问题阻碍了在较温和的超临界水（SCW）温度下有效的超临界水气化（SCWG）的发展，以利用湿生物质资源生产气体燃料。在这里，我们通过水热合成法制备了一系列负载的Ni催化剂，特别是在SCW区域操作，并研究了这些新开发的SCWG催化剂的活性和性能稳定性。Ni的支撑材料包括ZrO ₂，铈促进的ZrO ₂，Al ₂ O ₃，镁促进的Al ₂ O _3。，活性炭和碳纳米管，超临界水合成（SCWS）在500℃，23 MPa的间歇反应器中进行，使用金属硝酸盐作为起始原料。SCWG结果和催化剂表征（XRD，SEM-EDS，N ₂吸附/解吸和TGA）证实了SCWS制备的催化剂（特别是Ni / MgO-Al）具有高活性，优异的晶体结构和孔结构以及出色的再生能力。₂ O ₃）用于SCWG反应，表明SCWS是开发用于SCWG工艺的活性和稳定催化剂的有前途的方法。