摘要
采用水解-沉积法,选择(NH2)2CO、NH3·H2O、NH2(CH2)2OH、NH4HCO3、NaOH和Na2CO3为沉淀剂,制备了6种负载型NiO/γ-Al2O3催化剂,并对其进行了BET、EDS、XRD与H2-TPR表征分析,在相同条件下评价了其在CH4/CO2重整反应中的催化性能。结果表明,以NH2(CH2)2OH为沉淀剂最佳,其可使78.66%的镍沉积在载体上,该沉淀剂利于NiO的分散,还原后获得的晶粒Ni尺寸仅为5.3nm。制备的催化剂都存在游离态NiO、结晶态NiO和尖晶石NiAl10O16三种镍物种,但该沉淀剂所制备催化剂的NiO还原峰面积占总还原峰面积的84%,表明其具有良好的还原性。该催化剂具有较好的稳定性和抗积炭性能,CH4、CO2转化率和H2收率分别可达85.5%、63%和65.2%。
A series of NiO/γ-Al2O3 catalysts were prepared by hydrolysis-deposition method with （NH2）2CO, NH3·H2O, NH2（CH2）2OH, NH4HCO3, NaOH and Na2CO3 as precipitants, respectively, and characterized by BET, EDS, XRD and H2-TPR. The catalytic performances of the catalysts for CH4/CO2 reforming were evaluated under the same conditions. The results showed that NH2（CH2）2OH was the best precipitant, and it could make 78.66%of the calculated nickel deposited on the support, improve the dis-persion of NiO and obtain the Ni particles with the size of only 5.3 nm after reduction. There were three kinds of nickel species, free NiO, crystallite NiO and spinel NiAl10O16, for all the catalysts, but the catalyst prepared by NH2 （CH2）2OH had the highest ratio of the reduction peak area of NiO to the total reduction peak area in H2-TPR, which reached 84%, indicating that it could be better reduced. The catalyst prepared by NH2（CH2）2OH had good stability and resistance to carbon deposition, and the conversions of CH4 and CO2 and the yield of H2 could reach 85.5%, 63%and 65.2%, respectively, for it.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2014年第3期42-47,共6页
Natural Gas Chemical Industry
基金
新疆维吾尔自治区科技支撑计划项目(201232122)
新疆大学博士研究生创新项目(XJUBSCX-2013008)
