Gasification of wet municipal solid waste (MSW) coupled with in-situ CO₂ capture is an attractive option for MSW disposal, allowing chemical and energy recovery. In this study, the Ni-CaO based catalysts were prepared with waste marble powder (WMP) as an alternative to CaO and promoted by different transition metals (i.e., Fe, Cu, Co and Zn). The bimetallic catalysts were prepared by the impregnation method and characterized by different analytical techniques. The catalyst performance for wet MSW gasification was evaluated in a fixed-bed reactor at optimized conditions (850 °C and 50% moisture content of MSW). The results revealed that the addition of Ni-WMP catalyst greatly enhanced the dry gas yield (DGY), H₂ yield, carbon conversion efficiency (CCE) and reduced the tar content from 0.73 to 1.16 N.m³/kg, 212 to 509 mL/g, 61.70% to 76.40% and 9.11 to 3.9 wt%, respectively, compared to without catalyst. In contrast to the Ni-WMP catalyst, the transition metal promoted catalysts showed higher catalytic activity towards H₂ yield (549–629 mL/g), DGY (1.19–1.30 N.m³/kg), and lower tar content (3.45–2.93 wt%). The results revealed that Co promoted bimetallic catalyst performed better than Fe, Cu and Zn promoted catalysts. The tar content produced was also analyzed via GC–MS (gas chromatography-mass spectrometry) to understand the effect of different catalysts on tar composition. According to experimental results, the bimetallic promoted catalysts can be ranked as Ni-Co-WMP > Ni-Cu-WMP > Ni-Fe-WMP > Ni-Zn-WMP based on H₂ yield and tar removal.

湿城市固体废物 (MSW) 的气化结合原位 CO ₂捕获是 MSW 处理的一个有吸引力的选择，允许化学和能源回收。在这项研究中，Ni-CaO 基催化剂是用废大理石粉 (WMP) 作为 CaO 的替代品制备的，并由不同的过渡金属（即 Fe、Cu、Co 和 Zn）促进。双金属催化剂是通过浸渍法制备的，并通过不同的分析技术进行表征。在优化条件（850 °C 和 50% 的 MSW 水分含量）下，在固定床反应器中评估湿式 MSW 气化的催化剂性能。结果表明，Ni-WMP催化剂的加入大大提高了干气产率（DGY）、H ₂与没有催化剂的情况相比，产率、碳转化效率 (CCE) 和焦油含量分别从 0.73 到 1.16 Nm ³ /kg、212 到 509 mL/g、61.70% 到 76.40% 和 9.11 到 3.9 wt%。与 Ni-WMP 催化剂相比，过渡金属促进的催化剂对 H ₂产率 (549–629 mL/g)、DGY (1.19–1.30 Nm ³/kg) 和较低的焦油含量 (3.45–2.93 wt%)。结果表明，Co 促进的双金属催化剂的性能优于 Fe、Cu 和 Zn 促进的催化剂。还通过 GC-MS（气相色谱-质谱法）分析了产生的焦油含量，以了解不同催化剂对焦油组成的影响。根据实验结果，基于H ₂产率和焦油去除率，双金属促进的催化剂可以排序为Ni-Co-WMP > Ni-Cu-WMP > Ni-Fe-WMP > Ni-Zn-WMP 。