Effect of impregnation methods on nickel-tungsten catalysts and its performance on hydrocracking Fischer-Tropsch wax
-
摘要: 以Ni/W为加氢金属组分, HY/Al2O3为载体, 采用浸渍法制备三种金属-载体不同结合方式的加氢裂化催化剂, 研究了结合方式对催化剂酸性、加氢性能及FT合成蜡加氢裂化性能的影响。调整金属-载体的结合方式可明显调节催化剂加氢性能与裂解性能之间的平衡, Ni/W预先浸渍在HY分子筛上提高了催化剂的加氢性能, 降低了载体的酸性。结果表明, 高加氢性能-弱酸性的匹配有利于抑制F-T蜡的二次裂解, 提高柴油选择性。而Ni/W均匀浸渍在HY/Al2O3载体上可获得相对均衡的加氢/裂解性能匹配, 催化剂具有较高的反应活性及灵活的反应调控性。Abstract: Three hydrocracking catalysts were prepared by impregnation method with different incorporation manners of Ni/W metals on HY/Al2O3 support. The effect of combination methods on acidity, hydrogenation capability of the catalysts and its hydrocracking performance on FT wax was studied. The balance between hydrogenation performance and cracking performance could be modulated by adjusting the metal-support combination methods. Ni/W pre-impregnated on HY can increase the hydrogenation capability of the catalyst and simultaneously lower the acidity of the support. The results show that the coordination of high hydrogenation capability and low acidity of catalyst can inhibit the formation of secondary cracking on some extent, and increase the selectivity of diesel. While Ni/W metals supported on HY/Al2O3 can achieve a relative balance of hydrogenation and cracking, thus the catalysts have a higher activity and the more flexible ability to modulate reaction.
-
Key words:
- hydrocracking /
- catalyst /
- F-T wax /
- diesel /
- selectivity
-
ZHOU Z, ZHANG Y, TIERNEY J W, WENDER I. Hybrid zirconia catalysts for conversion of Fischer-Tropsch waxy products to transportation[J]. Fuel Process Technol, 2003, 83(1/3): 67-80. CHO K M, PARK S, SEO J G, YOUN M H, BAECK S H, JUN K W, CHUNG J S, SONG I K. Production of middle distillate in a dual-bed reactor from synthesis gas through wax cracking: Effect of acid property of Pd-loaded solid acid catalysts on the wax conversion and middle distillate selectivity[J]. Appl Catal B: Environ, 2008, 83: 195-201. 方向晨, 关明华, 廖士纲. 加氢裂化[M]. 北京: 中国石化出版社, 2008: 110-118. (FANG Xiang-chen, GUAN Ming-hua, LIAO Shi-gang. Hydrocracking[M]. Beijing: China Petrochemical Press, 2008: 110-118.) LECKEL D. Hydroprocessing euro 4-type diesel from high-temperature fischer-tropsch vacuum gas oils[J]. Energy Fuels, 2009, 23(1): 38-45. LEE J, HWANG S, SEO J G, HONG U G, JUNG J C, SONG I Y. Pd catalyst supported on SiO2-Al2O3 xerogel for hydrocracking of paraffin wax to middle distillate[J]. J Ind Eng Chem, 2011, 179(2): 310-315. GAMBA S, PELLEGRINI L A, CALEMMA V, GAMBARO C. Liquid fuels from Fischer-Tropsch wax hydrocracking: Isomer distribution[J]. Catal Today, 2010, 159(1/2): 58-64. TIAN R, SHEN B J, WANG F C, LU C X, XU C M. Ni/W-USY catalyst for high diesel yield and deep hydrodearomatization[J]. Energy Fuels, 2009, 23(1): 55-59. TORREA R D L I, DOMINGUEZ J M, MELO-BANDA J A, RAMOS G C E, SANDOVAL G. Synthesis of hybrid(Ni-Mo) carbides/carbon-coated mesoporous materials and their catalytic properties for hydrocracking of intermediate paraffins (n-C8)[J]. Catal Today, 2009, 148(1/2): 55-62. LEE J, HWANG S, SEO J G, LEE S B, JUNG J C, SONG I K. Production of middle distillate through hydrocracking of paraffin wax over Pd/SiO2-Al2O3 catalysts[J]. J Ind Eng Chem, 2010, 169(3/4): 790-794. CALEMMA V, PERATELLO S, PEREGO C. Hydroisomerization and hydrocracking of long chain n-alkanes on Pt/amorphous SiO2-Al2O3 catalyst[J]. Appl Catal, 2000, 190(1/2): 207-218. 李大东. 加氢处理工艺与工程[M]. 北京: 中国石化出版社, 2004: 170-200. (LI Da-dong. Hydrotreating technology and engineering[M]. Beijing: China Petrochemical Press, 2004: 170-200.) 万学兵, 丁连杰. 共胶法系列加氢裂化催化剂生产工艺的开发及工业应用[J]. 工业催化, 2002, 10(1): 10-16. (WAN Xue-bing, DING Lian-jie. Development and industrial application of a hydrocracking catalysts preparation technology via co-gelling method[J]. Industrial Catalysis, 2002, 10(1): 10-16) 杨军, 卢冠忠. 润滑油异构脱蜡催化剂研究[J]. 工业催化, 2002, 10(3): 1-7. (YANG Jun, LU Guan-zhong. Studies on lube oil isodewaxing catalyst[J]. Industrial Catalysis, 2002, 10(3): 1-7.) CUI G Q, WANG G F, FAN H F, SUN X Y, JIANG Y, WANG S J, LIU D, GUI J Z. Towards understanding the microstructures and hydrocracking performance of sulfide Ni-W catalysts: Effect of metal loading[J]. Fuel Process Technol, 2011, 92(12): 2320-2327. KELLY S D, YANG N, MICKELSON G E, GREENLAY N, KARAPETROVA E, SINKLER W, BARE S R.Structural characterization of Ni-W hydrocracking catalysts using in situ EXAFS and HRTEM[J]. J Catal, 2009, 263(1): 16-33. HAAN D R, JOORST G, MOKOENA E, NICOLAIDES C P. Non-sulfided nickel supported on silicate alumina as catalyst for the hydrocracking of n-hexadecane and of iron-based Fischer-Tropsch wax[J]. Appl Catal, 2007, 327(2): 247-254. PARK Y C, OH E S, RHEE H K. Characterization and catalytic activity of WNiMo/Al2O3 catalysts for hydrodenitrogenation of pyridine[J]. Ind Eng Chem Res, 1997, 36(12): 5083-5089. 郑云弟, 蒋彩兰, 康宏敏, 彭蓉, 王书峰, 钱颖. 加氢脱氮催化剂载体的研究[J]. 工业催化, 2010, 18(16): 1-7. (ZHENG Yun-di, JIANG Cai-lan, KANG Hong-min, PENG Rong, WANG Shu-feng, QIAN Ying. Researches on catalyst supports for hydrodenitrogenation[J]. Industrial Catalysis, 2010, 18(16): 1-7.) ELANGOVAN S P, MARTIN H. Evaluation of Pt/MCM-41//MgAPO-n composite catalysts for isomerization and hydrocracking of n-decane[J]. J Catal, 2003, 217(2): 388-395. MARTENS J A, TIELEN M, JACOBS P A, WEITKAMP J. Estimation of the void structure and pore dimensions of molecular sieve zeolites using the hydroconversion of n-decane[J]. Zeolites, 1984, 4(2): 98-107.
点击查看大图
计量
- 文章访问数: 1503
- HTML全文浏览量: 14
- PDF下载量: 628
- 被引次数: 0