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化工进展  2015 

C5/C6烷烃异构化Pt/Al2O3-Cl催化剂的性能

DOI: 10.16085/j.issn.1000-6613.2015.01.026, PP. 150-155

Keywords: 异构化,Pt/Al2O3-Cl,氯化,正己烷,粒子

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Abstract:

采用浸渍法制备了Pt/Al2O3,在300℃、CCl4氯化1h,制备出Pt/Al2O3-Cl催化剂。采用FT-IR、XRD、TEM、CO-IR、Py-IR和TPD等方法表征了催化剂,并与中温型RISO催化剂的催化性能进行比较。结果表明,在氯化处理过程中氯取代了氧化铝的表面羟基,导致3000~3800cm-1红外吸收峰强度大幅度减小,但催化剂的晶相不发生改变;氯化使Pt粒子的平均粒径增大,粒径分布变宽,金属分散度降低;氯化后金属Pt主要以+2价的PtCl2的形式出现,其中一部分生成了易升华的PtCl2·2AlCl3,从而导致Pt含量降低;氯化后的催化剂上只有L酸,评价后既有L酸,又有B酸;氯化后的催化剂热稳定不高,随着温度升高,3种类型的氯化物相继脱出;Pt/Al2O3-Cl相对于中温型RISO催化剂表现出较好的异构化性能,正己烷转化率达88.17%,2,2-二甲基丁烷选择性达29.68%,裂化和氢解几乎没有发生。

References

[1]  王海燕,刘志祥,毛宗强,等. SPE电解池催化剂载体的研究[J]. 化工新型材料,2009,37(1):32-33.
[2]  Yang S X,Li X,Zhu W P,et al. Catalytic activity,stability and structure of multi-walled carbon nanotubes in the wet air oxidation of phenol[J]. Carbon,2008,46:445-452.
[3]  Ducourty B,Szabo G,Dath J P,et al. Pt/Al2O3-Cl catalysts derived from ethylaluminumdichloride:Activity and stability in hydroisomerization of C6 alkanes[J]. Applied Catalysis A:General,2004,269(1):203-214.
[4]  Carmo M,Fritz D L,Mergel J,et al. A comprehensive review on PEM water electrolysis [J]. Int. J. Hydrogen Energy,2013,38(12):4901-4934.
[5]  Qu L T,Liu Y. Nitrogen-doped graphene as efficient metal-free electrocatalyst for oxygen reduction in fuel cells[J]. Acsnano,2010,4:1321-1326.
[6]  Bernard P M,Primet M. Influence of hydrogen chloride addition on the catalytic isomerization activity of chlorinated alumina and chlorinated platinum-alumina solids. Superacid behaviour[J]. J. Chem. Soc.,Faraday Trans.,1990,86(3):567-570.
[7]  Park S,Shao Y Y,Liu J,et al. Oxygen electrocatalysts for water electrolyzers and reversible fuel cells:Status and perspective [J]. Energy Environ. Sci.,2012,5(11):9331-9344.
[8]  任学佑. 质子交换膜燃料电池的进展与前景[J]. 电池,2003,33(6):395-397.
[9]  Yang,Z,Xia Y,Mokaya R. Aligned N-doped carbon nanotube bundles prepared via CVD using zeolite substrates[J]. Chem. Mater.,2005,17:4502-4508.
[10]  Sang H,Chu H Y,Lunsford J H. An NMR study of acid sites on chlorided alumina catalysts using trimethylphosphine as a probe[J]. Catalysis Letters,1994,26(3-4):235-246.
[11]  Wang X M,H J M,Zhang J Q. IrO2-SiO2 binary oxide films:Preparation,physiochemical characterization and their electrochemical properties [J]. Electrochim Acta,2010,55(15):4587-4593.
[12]  Kim S Y,Lee J,Na C W,et al. N-doped double-walled carbon nanotubes synthesized by chemical vapor deposition[J]. Chem. Phys. Lett.,2005,413:300-305.
[13]  Clet G,Goupil J M,Szabo G,et al. Chlorinated alumina as an alkylation catalyst:Influence of acidity moderators[J]. Applied Catalysis A:General,2000,202(1):37-47.
[14]  Maldonado S,Stevenson K J. Direct preparation of carbon nanofiber electrodes via pyrolysis of iron(II)Phthalo cyanine:Electro catalytic aspects for oxygen reduction[J]. Phys. Chem. B,2004,108:11375-11383.
[15]  Ye Z G,Meng H M,Chen D,et al. Structure and characteristics of Ti/IrO2(x) + MnO2(1-x) anode for oxygen evolution [J]. Solid State Sciences,2008,10(3):346-354.
[16]  Sharma S B,Meyers B L,Chen D T,et al. Characterization of catalyst acidity by microcalorimetry and temperature-programmed desorption[J]. Applied Catalysis A:General,1993,102(2):253-265.
[17]  张秋平,濮仲英,于春年,等. RISO型C5/C6烷烃异构化催化剂的工业生产及应用[J]. 石油炼制与化工,2006,36(8):1-4.
[18]  Ayala P,Gruneis A,Gemming T,et al. Tailoring N-doped single and double wall carbon nanotubes from a nondiluted carbon nitrogen feedstock.[J]. Phys. Chem. C,2007,111:2879-2884.

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