Hu Yong, Xu Qian, Sheng Yao, Wang Xueguang, Cheng Hongwei, Zou Xingli, Lu Xionggang
State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, BaoShan District, Shanghai 200444, China.
Materials (Basel). 2023 Aug 2;16(15):5430. doi: 10.3390/ma16155430.
Ni/CaO, a low-cost dual-functional material (DFM), has been widely studied for integrated CO capture and hydrogenation. The core of this dual-functional material should possess both good CO capture-conversion performance and structural stability. Here, we synthesized Ni/CaO DFMs modified with alkali metals (Na, K, and Li) through a combination of precipitation and combustion methods. It was found that Na-modified Ni/CaO (Na-Ni/CaO) DFM offered stable CO capture-conversion activity over 20 cycles, with a high CO capture capacity of 10.8 mmol/g and a high CO conversion rate of 60.5% at the same temperature of 650 °C. The enhanced CO capture capacity was attributed to the improved surface basicity of Na-Ni/CaO. In addition, the incorporation of Na into DFMs had a favorable effect on the formation of double salts, which shorten the CO capture and release process and promoted DFM stability by hindering their aggregation and the sintering of DFMs.
镍/氧化钙是一种低成本双功能材料（DFM），已被广泛研究用于集成式二氧化碳捕集与加氢过程。这种双功能材料的核心应兼具良好的二氧化碳捕集转化性能和结构稳定性。在此，我们通过沉淀法和燃烧法相结合的方式合成了用碱金属（钠、钾和锂）改性的镍/氧化钙双功能材料。研究发现，钠改性的镍/氧化钙（Na-Ni/CaO）双功能材料在20个循环中具有稳定的二氧化碳捕集转化活性，在650℃的相同温度下，其二氧化碳捕集容量高达10.8 mmol/g，二氧化碳转化率高达60.5%。二氧化碳捕集容量的提高归因于Na-Ni/CaO表面碱性的改善。此外，将钠引入双功能材料对复盐的形成具有有利影响，这缩短了二氧化碳的捕集和释放过程，并通过阻碍双功能材料的聚集和烧结促进了双功能材料的稳定性。
