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A highly efficient solar-driven CO2 reforming of methane on Ni/MgAlOx-LDH loaded Ni foam reactors with heat recovery: Experimental measurements and numerical simulations
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2022-06-09 , DOI: 10.1016/j.cej.2022.137437
Zekai Mu, Xianglei Liu, Hang Shi, Chao Song, Chunzhuo Dang, Ke Gao, Nan Sun, Cheng Tian, Hangbin Zheng, Xinrui Wang, Yimin Xuan

By converting two greenhouse gases into fuels, CO2 reforming of CH4 via free and clean solar energy is a promising solution to the energy shortage and global warming problems simultaneously. However, serious challenges such as limited light-to-fuel efficiency, severe catalyst aggregation, and deactivation still exist for reactors employing traditional catalyst powders. Here, Ni/MgAlOx-LDH catalysts loaded Ni foam reactor with heat recovery is proposed for highly efficient and stable CO2 reforming under direct concentrated solar irradiation. The temperature nonuniformity is reduced by 84.3% compared to powdered systems, which benefits from the high thermal conductivity of nickel foams. Overheating is also prevented, which leads to much less carbon deposition and relieved active sites aggregation. Ultrahigh light-to-fuel efficiency of 36.51% is achieved, which is much higher than that of traditional powdered systems (23.87%). Numerical simulation results have an excellent agreement with experiments and demonstrate that heat recovery can greatly improve CRM rates by 23.8%. This work opens new routes to achieve highly efficient, stable, and scalable solar-driven CO2 reforming via Ni/MgAlOx-LDH catalysts loaded Ni foam reactors with heat recovery.



中文翻译:

在 Ni/MgAlOx-LDH 负载 Ni 泡沫反应器上高效太阳能驱动 CO2 重整甲烷并进行热回收:实验测量和数值模拟

通过将两种温室气体转化为燃料,通过免费和清洁的太阳能对 CH 4进行 CO 2重整是同时解决能源短缺和全球变暖问题的有希望的解决方案。然而,对于采用传统催化剂粉末的反应器来说,仍然存在诸如有限的光燃料效率、严重的催化剂聚集和失活等严峻挑战。在此,提出了负载 Ni/MgAlO x -LDH 催化剂并具有热回收功能的泡沫镍反应器,以实现高效和稳定的 CO 2在直接集中的太阳辐照下重整。与粉末系统相比,温度不均匀性降低了 84.3%,这得益于泡沫镍的高导热性。还可以防止过热,从而减少碳沉积并减轻活性位点聚集。实现了36.51%的超高光燃效率,远高于传统粉末系统(23.87%)。数值模拟结果与实验有很好的一致性,表明热回收可以大大提高 CRM 率 23.8%。这项工作为通过负载 Ni/MgAlO x -LDH 催化剂并具有热回收功能的泡沫镍反应器实现高效、稳定和可扩展的太阳能驱动 CO 2重整开辟了新途径。

更新日期:2022-06-10
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