Ni/La2O3 and Ni/MgO-La2O3 catalysts for the decomposition of NH3 into hydrogen
Ni/La2O3 and Ni/MgO-La2O3 catalysts for the decomposition of NH3 into hydrogen
复制标题
Ni/La2O3 和 Ni/MgO-La2O3 催化剂用于将 NH3 分解为氢气
DOI：
10.1016/j.ijhydene.2020.04.127
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发表时间：
2020
影响因子：
7.2
通讯作者：
Feng Gang
中科院分区：
文献类型：
--
作者：
Yu Yingzhi;Gan Yu-Meng;Huang Chuanqing;Lu Zhang-Hui;Wang Zuewen;Zhang Rongbin;Feng Gang
采用表面模板法制备了不同组成和温度的Ni/La 2 O3催化剂，考察了催化剂活性金属含量、载体组成和焙烧温度对催化剂氨分解制氢活性的影响。所有样品的催化性能在大气压力下在300 ° C和600 °C之间进行了研究。样品的催化活性依次为：10 Ni/La 2 O3 -450 > 10 Ni/La 2 O3 -550 > 10 Ni/La 2 O3 -650 ≈ 10 Ni/La 2 O3 -750 ≈ 10 Ni/La 2 O3 -850。通过BET、CO2-TPD和XPS分析，10 Ni/La_2 O_3 -450催化剂具有较高的比表面积、碱性强度和表面氧物种浓度，因此具有较高的活性（100%）。此外，为了调节催化剂载体的活性，改变Mg和La的摩尔比（1：1、3：1、5：1、7：1和9：1）。发现5 Ni/5 MgLa（5：1 M比率）相对于其它Ni/MgLa制剂是最具活性的（100%）。此外，将Ni/5 MgLa样品中的Ni含量调节在10和40重量%之间。增加催化剂的Ni含量增加了NH3转化率，其中40wt%Ni制剂在600 °C和高气体时空速度（GHSV）（30，000 mL·h-1·gcat-1）下表现出完全的NH3转化率。
The decomposition of NH3for hydrogen production was studied using Ni/La2O3catalysts at varying compositions and temperatures prepared via surfactant-templated synthesis to elucidate the influence of catalyst active metal content, support composition and calcination temperature on the catalytic activity. The catalytic performance of all samples was studied between 300 and 600 °C under atmospheric pressure. The catalytic activity of the sample were as follows: 10Ni/La2O3-450 > 10Ni/La2O3-550 > 10Ni/La2O3-650 ≈ 10Ni/La2O3-750 ≈ 10Ni/La2O3-850. The excellent activity (100%) of 10Ni/La2O3-450 could be due to the high surface area, basicity strength and concentration of surface oxygen species of the catalyst as evidenced by BET, CO2-TPD and XPS. In addition, to adjust the activity of the catalyst support, the molar ratios of Mg and La were varied (1:1, 3:1, 5:1, 7:1 and 9:1). The 5Ni/5MgLa (5:1 M ratio) was found to be the most active (100%) relative to other Ni/MgLa formulations. Furthermore, the Ni content in the Ni/5MgLa sample was adjusted between 10 and 40 wt%. Increasing the Ni content of the catalysts increased NH3conversion with the 40 wt% Ni formulation demonstrating complete NH3conversion at 600 °C and a high gas hourly space velocities (GHSV) (30,000 mL∙h−1∙gcat−1).