摘要
以六水合硝酸镍和碳酸氢氨为原料、氨水为调节剂,采用水热沉淀法,在不同老化温度下制备了多孔纳米NiO材料;采用XRD、SEM、TEM和N_2吸附-脱附等方法对催化剂进行了表征,并考察了催化剂在氨分解制氢反应中的性能。实验结果表明,在120℃老化温度下制备的NiO分散性良好,平均粒径10.8 nm、比表面积62.2 m^2/g、孔体积0.112 cm^3/g、孔径4.62 nm。在氨分解制氢反应中,120℃老化的NiO催化剂在700℃下的氢气产率为27.87 mmol/(g·min)、氨转化率为83.25%、计算得出的活化能为55.11kJ/mol,具有良好的催化活性。多孔纳米NiO的合成过程易于操作,无需加入表面活性剂,对环境无污染。
Nano porous NiO catalysts were prepared from nickel nitrate hexahydrate and ammonium bicarbonate through hydrothermal precipitation with ammonia as conditioning agent at different aging temperature. The catalysts were characterized by means of XRD, SEM, TEM and N2 adsorption- desorption. The ammonia decomposition on the catalysts was investigated. It was showed that, the nano porous NiO particles prepared at the aging temperature of 120℃ had a narrow particle size distribution with the average particle size of 10.8 nm, specific surface area of 62.2 m2/g, pore volume of 0.112 cm3/g and pore size of 4.62 nm. In the ammonia decomposition reaction over the NiO catalyst at 700℃, the ammonia conversion and the H2 generation rate reached 83.25% and 27.87 mmol/（g·min）, respectively. The calculated activation energy is 55.11 kJ/mol. This synthetic process is simple and environmentally friendly without the addition of surfactants.
出处
《石油化工》
CAS
CSCD
北大核心
2016年第10期1180-1185,共6页
Petrochemical Technology
关键词
水热沉淀法
纳米氧化镍催化剂
氨分解制氢
hydrothermal precipitation
nano NiO catalyst
ammonia decomposition to hydrogen
