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首页> 外文期刊>Journal of power sources >Preparation of a Ni-MgO-Al_2O_3 catalyst with high activity and resistance to potassium poisoning during direct internal reforming of methane in molten carbonate fuel cells
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Preparation of a Ni-MgO-Al_2O_3 catalyst with high activity and resistance to potassium poisoning during direct internal reforming of methane in molten carbonate fuel cells

机译：具有高活性并且在熔融碳酸盐燃料电池中的甲烷直接内部重整过程中具有抗钾中毒性的Ni-MgO-Al_2O_3催化剂的制备

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Steam reforming of methane (SRM) is conducted using a series of Ni-MgO-Al2O3 catalysts for direct internal reforming (DIR) in molten carbonate fuel cells (MCFCs). Ni-MgO-Al2O3 catalysts are prepared by the homogeneous precipitation method with a variety of MgO loading amounts ranging from 3 to 15 wt%. In addition, each precursor concentrations are systemically changed (Ni: 1.2-4.8 mol L-1; Mg: 0.3-1.2 mol L-1; Al: 0.4-1.6 mol L-1) at the optimized composition (10 wt% MgO). The effects of MgO loading and precursor concentration on the catalytic performance and resistance against poisoning of the catalyst by potassium (K) are investigated. The Ni-MgO-Al2O3 catalyst with 10 wt% MgO and the original precursor concentration (Ni: 1.2 mol L-1; Mg: 0.3 mol L-1; Al: 0.4 mol L-1) exhibits the highest CH4 conversion and resistance against K poisoning even at the extremely high gas space velocity (GHSV) of 1,512,000 h(-1). Excellent SRM performance of the Ni-MgO-Al2O3 catalyst is attributed to strong metal (Ni) to alumina support interaction (SMSI) when magnesium oxide (MgO) is co-precipitated with the Ni-Al2O3. The enhanced interaction of the Ni with MgO-Al2O3 support is found to protect the active Ni species against K poisoning.
机译：使用一系列Ni-MgO-Al2O3催化剂进行甲烷的蒸汽重整（SRM），以在熔融碳酸盐燃料电池（MCFC）中进行直接内部重整（DIR）。 Ni-MgO-Al2O3催化剂是通过均相沉淀法制备的，其中MgO的负载量范围为3至15 wt％。另外，在优化的组成（10 wt％MgO）下，每种前体的浓度都会发生系统性变化（Ni：1.2-4.8 mol L-1； Mg：0.3-1.2 mol L-1； Al：0.4-1.6 mol L-1）。 。研究了MgO的负载量和前驱体浓度对催化剂性能和钾（K）的抗中毒性的影响。具有10 wt％MgO和原始前体浓度（Ni：1.2 mol L-1; Mg：0.3 mol L-1; Al：0.4 mol L-1）的Ni-MgO-Al2O3催化剂表现出最高的CH4转化率和耐化学性即使在1,512,000 h（-1）的极高气体空速（GHSV）下，K也会中毒。 Ni-MgO-Al2O3催化剂的出色SRM性能归因于当氧化镁（MgO）与Ni-Al2O3共沉淀时，强金属（Ni）与氧化铝载体相互作用（SMSI）。发现Ni与MgO-Al2O3载体的增强相互作用可保护活性Ni免受K中毒。

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