CAJ | 학술논문

通过浸渍法制备了 Ni/ SAPO-11催化剂,并进一步通过分步浸渍法制备了 Ni-Ce / SAPO-11双金属催化剂,对其晶相结构和表面酸性进行了表征.实验结果表明, Ce 的引入导致比表面积和孔容增大,总酸量升高而酸强度降低,金属 Ni 在载体 SAPO-11表面的分散度提高.通过对正庚烷的临氢异构化反应研究发现,引入 Ce 可以显著提高异庚烷的选择性.在 n(H2)/ n(n-C7 H16)=12, MHSV=3.52 h-1,催化剂量0.3 g,反应温度300℃条件下, Ni-2% Ce/ SAPO-11催化剂的正庚烷转化率可达25.4%,异庚烷的选择性可达90.4%.
통과침지법제비료 Ni/ SAPO-11최화제,병진일보통과분보침지법제비료 Ni-Ce / SAPO-11쌍금속최화제,대기정상결구화표면산성진행료표정.실험결과표명, Ce 적인입도치비표면적화공용증대,총산량승고이산강도강저,금속 Ni 재재체 SAPO-11표면적분산도제고.통과대정경완적림경이구화반응연구발현,인입 Ce 가이현저제고이경완적선택성.재 n(H2)/ n(n-C7 H16)=12, MHSV=3.52 h-1,최화제량0.3 g,반응온도300℃조건하, Ni-2% Ce/ SAPO-11최화제적정경완전화솔가체25.4%,이경완적선택성가체90.4%.
The monometallic catalyst Ni/ SAPO-11 was prepared via the impregnation method. Then, the bi-metallic catalyst Ni-Ce / SAPO-11 was prepared via the sequential impregnation method. The crystal structure and acidity of these two catalysts were determined by X-ray powder diffraction, Brunauer-Emmett-Teller (BET) methods and temperature-programmed desorption of ammonia. With addition of Ce, the BET surface areas and porous volume of Ni/ SAPO-11 and total acidity were increased, and the acid strength was de-creased. Introduction of Ce improved the dispersion of Ni on the surface of SAPO-11. Addition of Ce could improve the selectivity of the hydroisomerization of n-heptane considerably. Under the conditions of n(H2 ) /n(n-C7 H16 )= 12, weight hourly space velocity =3. 52 h-1 , catalyst weight=0. 3 g, and the reaction tempera-ture of 300 ℃, the conversion of n-heptane could reach 25. 4% and the isomerization selectivity to i-heptane could reach 90. 4% .