Journal of Petrochemical Universities ›› 2024, Vol. 37 ›› Issue (3): 17-24.DOI: 10.12422/j.issn.1006-396X.2024.03.003
• Petrochemical Engineering • Previous Articles Next Articles
Weijian TANG(), Yujia WANG, Na SUN, Haiyan WANG()
Received:
2022-05-26
Revised:
2024-04-28
Published:
2024-06-25
Online:
2024-06-18
Contact:
Haiyan WANG
通讯作者:
王海彦
作者简介:
唐伟建(1996-),男,硕士研究生,从事清洁燃料生产新工艺方面的研究;E-mail:1358832485@qq.com。
基金资助:
CLC Number:
Weijian TANG, Yujia WANG, Na SUN, Haiyan WANG. Research Progress of Catalysts for Cyclohexylbenzene Synthesis Based on Different Routes[J]. Journal of Petrochemical Universities, 2024, 37(3): 17-24.
唐伟建, 王钰佳, 孙娜, 王海彦. 基于不同路线合成环己基苯的催化剂研究进展[J]. 石油化工高等学校学报, 2024, 37(3): 17-24.
分子筛 | SBET/(m2·g-1) | Smicro/(m2·g-1) | Smeso/(m2·g-1) | Vtotle/(cm3·g-1) | Vmicro/(cm3·g-1) | Vmeso/(cm3·g-1) |
---|---|---|---|---|---|---|
HZSM | 325 | 26 | 300 | 0.173 | 0.034 | 0.139 |
H-IM-5 | 286 | 56 | 229 | 0.286 | 0.180 | 0.106 |
H-RZM | 531 | 44 | 487 | 0.314 | 0.084 | 0.230 |
BETA | 529 | 104 | 425 | 0.458 | 0.262 | 0.196 |
HMCM-49 | 448 | 82 | 366 | 0.607 | 0.540 | 0.167 |
HY | 653 | 33 | 620 | 0.354 | 0.068 | 0.286 |
Table 1 Texture properties of different molecular sieves[48]
分子筛 | SBET/(m2·g-1) | Smicro/(m2·g-1) | Smeso/(m2·g-1) | Vtotle/(cm3·g-1) | Vmicro/(cm3·g-1) | Vmeso/(cm3·g-1) |
---|---|---|---|---|---|---|
HZSM | 325 | 26 | 300 | 0.173 | 0.034 | 0.139 |
H-IM-5 | 286 | 56 | 229 | 0.286 | 0.180 | 0.106 |
H-RZM | 531 | 44 | 487 | 0.314 | 0.084 | 0.230 |
BETA | 529 | 104 | 425 | 0.458 | 0.262 | 0.196 |
HMCM-49 | 448 | 82 | 366 | 0.607 | 0.540 | 0.167 |
HY | 653 | 33 | 620 | 0.354 | 0.068 | 0.286 |
分子筛 | 转化率/% | 选择性/% | |||||
---|---|---|---|---|---|---|---|
环己基苯 | 双环己基苯 | 环己烷 | 甲基环戊烷 | 甲基环戊基苯 | 其他 | ||
Pd/HZSM-5 | 15.40 | 43.49 | 9.39 | 46.55 | 0.21 | 0.31 | 0.05 |
Pd/H-IM-5 | 13.73 | 9.79 | 0.70 | 87.91 | 0.80 | 0.80 | 0.03 |
Pd/H-RZM | 12.45 | 16.47 | 2.01 | 81.20 | 0 | 0.16 | 0.16 |
Pd/HBETAAA | 36.61 | 62.85 | 28.27 | 5.76 | 0.04 | 1.37 | 1.71 |
Pd/HMCM-49 | 34.69 | 71.55 | 20.06 | 6.49 | 0.03 | 0.32 | 1.55 |
Pd/HY | 48.63 | 82.94 | 14.97 | 0.64 | 0.06 | 0.35 | 1.04 |
Table 2 Performance of benzene hydrogenation alkylation on different molecular sieve catalysts loaded with palladium[48]
分子筛 | 转化率/% | 选择性/% | |||||
---|---|---|---|---|---|---|---|
环己基苯 | 双环己基苯 | 环己烷 | 甲基环戊烷 | 甲基环戊基苯 | 其他 | ||
Pd/HZSM-5 | 15.40 | 43.49 | 9.39 | 46.55 | 0.21 | 0.31 | 0.05 |
Pd/H-IM-5 | 13.73 | 9.79 | 0.70 | 87.91 | 0.80 | 0.80 | 0.03 |
Pd/H-RZM | 12.45 | 16.47 | 2.01 | 81.20 | 0 | 0.16 | 0.16 |
Pd/HBETAAA | 36.61 | 62.85 | 28.27 | 5.76 | 0.04 | 1.37 | 1.71 |
Pd/HMCM-49 | 34.69 | 71.55 | 20.06 | 6.49 | 0.03 | 0.32 | 1.55 |
Pd/HY | 48.63 | 82.94 | 14.97 | 0.64 | 0.06 | 0.35 | 1.04 |
1 | SINGHAL S, AGARWAL S, ARORA S, et al. Solid acids: Potential catalysts for alkene-isoalkane alkylation[J]. Catalysis Science & Technology, 2017, 7(24): 5810-5819. |
2 | 夏玥穡, 温朗友, 纪刚, 等. 环己基苯氧化-分解联产苯酚和环己酮技术的研究进展Ⅱ. 环己基苯氧化-分解制备苯酚和环己酮[J]. 石油化工, 2016, 45(7): 769-775. |
XIA Y S,WEN L Y,JI G, et al.Progresses in synthesis of phenol and cyclohexanone by catalytic oxidation-decomposition of cyclohexylbenzene Ⅱ.Cyclohexylbenzene oxidation-decomposition to phenol and cyclohexanone[J].Petrochemical Tech-nology,2016,45(7):769-775. | |
3 | KANG K S, SEONG M J, OH S H, et al. Surface-modified Ni-rich layered oxide cathode via thermal treatment of poly (vinylidene fluoride) for lithium-ion batteries[J]. Bulletin of the Korean Chemical Society, 2020, 41(11): 1107-1113. |
4 | MENG F F, DONG L H, MENG W, et al. High efficiency catalyst of modified Y molecular sieve by rare earth La3+ catalyzed the synthesis of cyclohexylbenzene from benzene and cyclohexene[J]. Catalysis Letters, 2022, 152(3): 745-754. |
5 | 方云进, 郭欢欢. 离子液体催化苯与环己烯的烷基化合成环己基苯[J]. 精细化工, 2008, 25(4): 405-408. |
FANG Y J, GUO H H. Synthesis of cyclohexylbenzene by alkylation of benzene with cyclohexene catalyzed by ionic liquid[J]. Fine Chemicals, 2008, 25(4): 405-408. | |
6 | 吴盼盼, 金顶峰, 张明, 等. 傅克法合成二苯甲烷的研究进展[J]. 化学试剂, 2016, 38(7): 631-636. |
WU P P, JIN D F, ZHANG M, et al. Progress on synthesis of diphenymethane by friedel-crafts method[J]. Chemical Reagents, 2016, 38(7): 631-636. | |
7 | 刘晓林. 傅-克烷基化反应催化剂的研究及烷基化反应产物的应用[D]. 兰州: 兰州交通大学, 2017. |
8 | 先雪峰, 周刚. 苯基环己烷的制备方法: CN200510130526.2[P]. 2005-12-13. |
9 | 黄琴琴, 王德举, 刘仲能, 等. 环己基苯合成用催化剂: CN201410575137.X[P]. 2014-10-24. |
10 | 王高伟, 魏一伦, 方华, 等. 液相烷基化制环己基苯的方法: CN201510586153.3[P]. 2015-09-15. |
11 | 裘俊峰. 环己基苯液相氧化工艺优化及动力学研究[D]. 上海: 华东理工大学, 2016. |
12 | 周刚. 苯基环己烷的制备方法: CN200610063622.4[P]. 2006-12-31. |
13 | 王闻年, 王高伟, 高焕新, 等. 环己基苯的合成及其催化剂研究进展[J]. 化工进展, 2019, 38(1): 324-333. |
WANG W N, WANG G W, GAO H X, et al. Progress in synthesis of cyclohexylbenzene and the catalysts[J]. Chemical Industry and Engineering Progress, 2019, 38(1): 324-333. | |
14 | YANG Y F, MA J Y, Wu J Y, et al. Experimental and theoretical study on N-hydroxyphthalimide and its derivatives catalyzed aerobic oxidation of cyclohexylbenzene[J]. Chinese Journal of Chemical Eniginerring, 2022, 44: 124-130. |
15 | 段晶, 王文浩, 周集义, 等. Friedel-Crafts反应催化剂的研究进展[J]. 化学推进剂与高分子材料, 2009, 7(5): 15-21. |
DUAN J, WANG W H, ZHOU J Y, et al. Research progress of catalysts in friedel-crafts reaction[J]. Chemical Propellants & Polymeric Materials, 2009, 7(5): 15-21. | |
16 | GE G Y, ZHOU Y M, SHENG X L, et al. The study of industrializable ionic liquid catalysts for long‐chain alkenes friedel–crafts alkylation[J]. Applied Organometallic Chemistry, 2020, 34(10): e5878. |
17 | 沈江南, 阮慧敏, 吴东柱, 等. 离子液体支撑液膜的研究及应用进展[J]. 化工进展, 2009, 28(12): 2092-2098. |
SHEN J N, RUAN H M, WU D Z, et al. Progress of supported liquid membrane with ionic liquids[J]. Chemical Industry and Engineering Progress, 2009, 28(12): 2092-2098. | |
18 | 高岩. 盐酸三乙胺离子液体催化苯和环己烯合成环己基苯[D]. 郑州: 郑州大学, 2016. |
19 | 王迎宾, 李建伟, 淳宏, 等. 室温离子液体催化苯与环己烯的烷基化反应[J]. 精细石油化工进展, 2008, 9(10): 25-28. |
WANG Y B, LI J W, CHUN H, et al. Alkylation of benzene and cyclohexene catalyzed by room-temperature ionic liquid[J]. Advances in Fine Petrochemicals, 2008, 9(10): 25-28. | |
20 | 何建玲. 离子液体催化苯与环己烯的Friedel-Crafts烷基化反应[J]. 光谱实验室, 2011, 28(5): 2480-2483. |
HE J L. Friedel-crafts alkylation reaction of benzene with cyclohexene by ionic liquids[J]. Chinese Journal of Spectroscopy Laboratory, 2011, 28(5): 2480-2483. | |
21 | 方云进, 郭欢欢. 环己基苯的制备方法: CN200810032620.8[P]. 2008-01-14. |
22 | XU M Q, XING L D, LI W S, et al. Application of cyclohexyl benzene as electrolyte additive for overcharge protection of lithium ion battery[J]. Journal of Power Sources, 2008, 184(2): 427-431. |
23 | 曹鹏福,赵沪春,闫占冬,等.高温高压下离子液体对原油中沥青质沉淀的抑制效果评价[J].油田化学,2023,40(2):297-304. |
CAO P F,ZHAO H C,YAN Z D,et al.Inhibition effect evaluation of ionic liquid on asphaltene precipitation in crude oil under high temperature and pressure[J].Oilfield Chemistry,2023,40(2):297-304. | |
24 | 杜一萌, 刘明星, 杨艺, 等. 新型氨基酸型离子液体的制备及性能研究[J]. 当代化工, 2022, 51(4): 795-799. |
DU Y M, LIU M X, YANG Y, et al. Study on the preparation and performance of a new type of amino acid ionic liquid[J]. Contemporary Chemical Industry, 2022, 51(4): 795-799. | |
25 | CHERNOVA M M, MINAYEV P P, MARTYNENKO Y A, et al. An effect of a support nature and active phase morphology on catalytic properties of Ni-containing catalysts in hydrogenation of biphenyl[J]. Russian Journal of Applied Chemistry, 2018, 91(10): 1701-1710. |
26 | TANG G M, XI Y R, SUN W C, et al. Syntheses, crystal structures, luminescence, hirshfeld surface analyses and thermal properties of biphenyl carbazole derivatives[J]. Journal of Molecular Structure, 2021, 1245: 131018. |
27 | KALENCHUK A N, KOKLIN A E, BOGDAN V I, et al. Hydrogenation of naphthalene and anthracene on Pt/C catalysts[J]. Russian Chemical Bulletin, 2018, 67(8): 1406-1411. |
28 | 刘成运. 多环芳烃的选择性催化加氢研究[D]. 大连: 大连理工大学, 2013. |
29 | 袁履冰, 丁勇. 计算共振能的一个新的经验方法[J]. 化学研究与应用, 1991(4): 19-27. |
YUAN L B, DING Y. A new empirical method for calculation of resonance energy[J]. Chemical Research and Application, 1991(4): 19-27. | |
30 | 吕连海, 荣泽明, 胡爽, 等. 一种联苯高选择性催化加氢制备环己基苯的方法: CN200610045625.5[P]. 2006-01-06. |
31 | 荣泽明. 骤冷骨架Ni和纳米Pt/C催化芳环和硝基加氢的研究[D]. 大连: 大连理工大学, 2010. |
32 | 刘星. 骨架镍与负载镍催化愈创木酚加氢的研究[D]. 大连: 大连理工大学, 2018. |
33 | 孙亮. 对苯二酚和联苯选择性催化加氢的研究[D]. 大连: 大连理工大学, 2013. |
34 | LI W, ZHAO Z P, LI J P, et al. Effects of Ni-loading on the performance of Ni/SiO2 catalysts for the highly selective hydrogenation of biphenyl to cyclohexylbenzene[J]. ChemistrySelect, 2021, 6(16): 3897-3902. |
35 | ZHANG Y J, YANG Y S, HOU Q D, et al. Metal–acid bifunctional catalysts toward tandem reaction: One-step hydroalkylation of benzene to cyclohexylbenzene[J]. ACS Applied Materials & Interfaces, 2022, 14(28): 31998-32008. |
36 | FAHY J, TRIMM D L, COOKSON D J. Four component catalysis for the hydroalkylation of benzene to cyclohexyl benzene[J]. Applied Catalysis A: General, 2001, 211(2): 259-268. |
37 | MENG F F, DING Y S, MENG W, et al. Modification of molecular sieves USY and their application in the alkylation reaction of benzene with cyclohexene[J]. ChemistrySelect, 2020, 5(29): 8935-8941. |
38 | KRALIK M, VALLUSOVA Z, LALUCH J, et al. Comparsion of ruthenium catalysis supported on beta and mordenite in the hydrocycloalkylation of benzene[J]. Petroleum & Coal, 2008, 50(1): 44-51. |
39 | SLAUGH L H, LEONARD J A. Hydrodimerization of benzene to phenylcyclohexane over supported transition metal catalysts[J]. Journal of Catalysis, 1969, 13(4): 385-396. |
40 | YANG Y F, YOU Y, WU J Y, et al. Phosphotungstic acid encapsulated in USY zeolite as catalysts for the synthesis of cyclohexylbenzene[J]. Journal of the Iranian Chemical Society, 2021, 18(3): 573-580. |
41 | IVANOVA I I, BORODINA I B, PONOMAREVA O A, et al. Hydroalkylation of benzene and ethylbenzene over Ru- and Ni- containing zeolite catalysts – novel catalytic route for ethylcyclobenzene synthesis[J]. Studies in Surface Science & Catalysis, 2007, 170: 1228-1235. |
42 | HUANG J Y, LI Z Q, YANG J Y, et al. Identification of metal/acid matching balance over bifunctional Pd/Hβ toward benzene hydroalkylation[J]. Industrial & Engineering Chemistry Research, 2021, 60(5): 2326-2336. |
43 | 董帅帅, 单玉华, 徐文杰, 等. 苯加氢烷基化合成环己基苯催化剂研究[J]. 现代化工, 2013, 33(8): 73-77. |
DONG S S, SHAN Y H, XU W J, et al. Study on catalysts for synthesis of cyclohexylbenzene by hydroalkylation of benzene[J]. Modern Chemical Industry, 2013, 33(8): 73-77. | |
44 | 曹鹰, 单玉华, 司坤坤, 等. 苯加氢烷基化制环己基苯催化剂的制备与工艺条件的考察[J]. 石油化工, 2015, 44(2): 175-180. |
CAO Y, SHAN Y H, SI K K, et al. Catalyst and process of benzene hydroalkylation to cyclohexylbenzene[J]. Petrochemical Technology, 2015, 44(2): 175-180. | |
45 | 郑一天, 单玉华, 冯洋洋, 等. 苯加氢烷基化制备环己基苯催化剂的研制及其应用[J]. 精细化工, 2017, 34(10): 1161-1168. |
ZHENG Y T, SHAN Y H, FENG Y Y, et al. Preparation and application of catalysts for hydroalkylation of benzene to cyclohexylbenzene[J]. Fine Chemicals, 2017, 34(10): 1161-1168. | |
46 | 石文路, 乔庆东. 苯与烯烃烷基化催化剂的研究进展[J]. 现代化工, 2017, 37(12): 54-58. |
SHI W L, QIAO Q D. Study progress of catalysts for alkylation reactions of benzene and olefins[J]. Modern Chemical Industry, 2017, 37(12): 54-58. | |
47 | 王闻年, 王高伟, 高焕新, 等. Y分子筛介微孔结构与酸性对苯加氢烷基化反应的影响[J]. 化学反应工程与工艺, 2018, 34(3): 243-253. |
WANG W N, WANG G W, GAO H X, et al. Effect of meso-micro-pore structure and acidity of zeolite Y on hydroalkylation of benzene[J]. Chemical Reaction Engineering and Technology, 2018, 34(3): 243-253. | |
48 | 纪刚, 温朗友, 郜亮, 等. 不同分子筛负载Pd催化剂催化苯加氢烷基化制备环己基苯[J]. 石油学报(石油加工), 2020, 36(1): 70-77. |
JI G, WEN L Y, GAO L, et al. Benzene hydroalkylation to cyclohexylbenzene over different zeolites supported Pd catalysts[J]. Acta Petrolei Sinica(Petroleum Processing Section), 2020, 36(1): 70-77. | |
49 | 杨洋, 孙娜, 王雪, 等. 梯度孔Hβ的制备及其催化苯加氢烷基化性能[J]. 辽宁石油化工大学学报, 2022, 42(1): 7-12. |
YANG Y, SUN N, WANG X, et al. Preparation of hierarchical porous Hβ and its catalytic performance in benzene hydroalkylation[J]. Journal of Liaoning Petroleumchemical University, 2022, 42(1): 7-12. | |
50 | 王维, 单玉华, 刘平, 等. 硅铝源对Ni-Pd-La/Hβ催化苯制环己基苯的影响[J]. 精细化工, 2021, 38(9): 1853-1859. |
WANG W, SHAN Y H, LIU P, et al. Effection of Si and Al sources on hydroalkylation of benzene to cyclohexylbenzene over Ni-Pd-La/Hβ[J]. Fine Chemicals, 2021, 38(9): 1853-1859. | |
51 | SHI J, WANG Y D, YANG W M, et al. Recent advances of pore system construction in zeolite-catalyzed chemical industry processes[J]. Chemical Society Reviews, 2015, 44(24): 8877-8903. |
52 | 惠宇, 刘金玲, 秦玉才, 等. 柠檬酸改性Hβ分子筛酸性中心的调变与解析[J]. 石油化工高等学校学报, 2020, 33(3): 14-20. |
HUI Y, LIU J L, QIN Y C, et al. Discrimination and regulation of the acidic sites of Hβ zeolite with citric acid treatment[J]. Journal of Petrochemical Universities, 2020, 33(3): 14-20. | |
53 | 王园园, 宋华, 孙兴龙, 等. Hβ分子筛的磷改性及其催化甲苯和叔丁醇烷基化反应性能[J]. 东北石油大学学报, 2020, 44(4): 85-90. |
WANG Y Y, SONG H, SUN X L, et al. Phosphprus modified Hβ zeolites and the catalytic perpormance for alkylation of toluene with tert-butylalcohol[J]. Journal of Northeast Petroleum University, 2020, 44(4): 85-90. | |
54 | 王京, 刘中勋, 周震寰, 等. 苯与合成气烃化催化剂的改进研究[J]. 石油炼制与化工, 2022, 53(4): 24-29. |
WANG J, LIU Z X, ZHOU Z H, et al. Study on modified catalyst of benzene alkylation reaction with syngas[J]. Petroleum Processing and Petrochemicals, 2022, 53(4): 24-29. | |
55 | 高杭, 秦波, 杜艳泽, 等. Y-Beta复合分子筛的甲苯甲醇烷基化性能研究[J]. 当代化工, 2018, 47(3): 494-497. |
GAO H, QIN B, DU Y Z, et al. Catalytic activity of composite zeolites Y-Beta for alkylation of toluene with methanol[J]. Contemporary Chemical Industry, 2018, 47(3): 494-497. |
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[2] | Ning Jianmei,Peng Kun,Yang Lixia,et al. Synthesis of HeteroplyacidInioc Liquids and Their Application in Clean Oxidation [J]. Journal of Petrochemical Universities, 2015, 28(6): 14-19. |
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