Preparation of dicalcium ferrite and its catalytic properties for methane
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摘要: 以九水合硝酸铁和四水合硝酸钙为原料，去离子水为溶剂，柠檬酸为络合剂,氨水调节溶液pH值,以空白堇青石蜂窝为负载体，制备铁酸二钙堇青石蜂窝负载型催化剂。结果表明，柠檬酸用量为钙铁离子总摩尔量的2.5倍，700 ℃条件下煅烧2 h可制备得到物相单一、结晶度高、孔隙度发达的纳米级铁酸二钙堇青石负载型催化剂。制备得到的纳米级铁酸二钙的比表面积为174.29 m2/g、孔容为0.31423 cm3/g、孔径为7.31 nm、平均孔径为1.89 nm，是一种对甲烷气体（典型烧结烟气VOCs）具有良好催化脱除和矿化性能的非贵金属催化剂。Abstract: Using Iron(Ⅲ) nitrate nonahydrate and calcium nitrate tetrahydrate as raw materials, deionized water as solvent, citric acid as complexing agent, ammonia water to adjust pH value of solution, blank cordierite honeycomb as support, dicalcium ferrite cordierite honeycomb support type catalyst was prepared. The results show that nanoscale dicalcium ferrite/cordierite honeycomb-supported catalyst with single phase, high crystallinity and developed porosity can be obtained when the molar amount of citric acid is 2.5 times the total amount of calcium and iron ions, and calcinated at 700 ℃ for 2 h. The as-prepared nanosized dicalcium ferrite has a specific surface area of 174.29 m2/g, pore volume of 0.31423 cm3/g, pore size of 7.31 nm, and average pore size of 1.89 nm. It is a kind of non-noble metal catalysts for methane gas (VOCs of typical sintering flue gas) with good catalytic removal and mineralization performance.
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图 1 不同柠檬酸用量制备的铁酸二钙XRD谱
Figure 1. XRD patterns of dicalcium ferrite prepared with different amounts of citric acid
图 2 不同柠檬酸用量700 ℃下制备的铁酸二钙BET结果
Figure 2. BET patterns of dicalcium ferrite prepared with different amounts of citric acid at 700 ℃
图 3 不同柠檬酸用量700 ℃煅烧后孔径分布
Figure 3. Pore size distribution with different citric acid amounts when calculated at 700 ℃
图 4 不同煅烧温度下制备的铁酸二钙XRD谱
Figure 4. XRD patterns of dicalcium ferrite prepared at different calcination temperatures
图 5 不同煅烧温度下制备的铁酸二钙BET分析结果
Figure 5. BET patterns of dicalcium ferrite prepared at different calcination temperatures
图 6 不同煅烧温度条件下制备铁酸二钙的孔径分布
Figure 6. Pore size distribution of dicalcium ferrite prepared with the amount of citric acid of 2.5 times and different calcination temperatures
图 7 柠檬酸用量2.5倍、煅烧温度700 ℃铁酸二钙SEM及EDS谱
Figure 7. SEM and EDS-mapping of dicalcium ferrite with the amount of citric acid of 2.5 times and calcination temperature 700 ℃
图 8 四种铁酸二钙催化剂和空白对照组对甲烷催化氧化燃烧性能测试
Figure 8. Methane catalytic oxidation combustion performance test on four kinds of dicalcium ferrite catalysts and blank control group
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