Effect of preparation conditions on isomerization performance of Pt/SO42-/ZrO2-Al2O3 catalyst

doi:10.16085/j.issn.1000-6613.2015.02.019

Abstract

Abstract: Pt/SO₄^2-/ZrO₂-Al₂O₃ (PtSZA) catalyst was prepared by the precipitation method. The influences of preparation conditions,such as drying rate of Zr(OH)₄, hydrogel,zirconium concentration,platinum content and addition order of Al₂O₃/SO₄^2- on isomerization performance of PtSZA catalyst,especially low reaction temperature isomerization performance were investigated. The crystalline structure and sulfur content of PtSZA were characterized with XRD and TG,respectively. Increase of drying rate of Zr(OH)₄, hydrogel led to decrease of sulfur content and remarkable increase of monoclinic phase in PtSZA catalyst,and then to rapid deactivation of the catalyst at low reaction temperature and a lower catalytic activity at high reaction temperature. Too low or too high zirconium concentration was unfavorable to the low reaction temperature stability of PtSZA catalyst. The PtSZA sample prepared with 0.4-0.6mol/L zirconium concentration showed higher sulfur content,more tetragonal phase and higher catalytic activity than that prepared with other zirconium concentration. The effect of addition order of Al₂O₃ and SO₄^2- on isomerization performance was negligible.

Key words: preparation, drying, Pt/SO₄^2-/ZrO₂-Al₂O₃, alkane, hydro-isomerization

摘要： 采用沉淀法制备了Pt/SO₄^2-/ZrO₂-Al₂O₃ (PtSZA)催化剂,考察了氢氧化锆水凝胶干燥速率、锆盐浓度、铂含量、Al₂O₃和SO₄^2-添加顺序等制备条件对PtSZA异构化性能,尤其是低温异构化性能的影响,并用XRD和TG对催化剂进行了表征。结果表明,提高水凝胶的干燥速率降低了PtSZA催化剂中的硫含量,大大提高了催化剂中的单斜相,进而导致了催化剂低温失活加速以及高温活性下降。较低或较高的锆盐浓度劣化了PtSZA的低温异构化稳定性,以0.4~0.6mol/L硝酸氧锆制备的催化剂硫含量和四方相氧化锆含量较高,异构化活性相对较好,Al₂O₃和SO₄^2-添加顺序对PtSZA异构化性能没有明显影响。

关键词: 制备, 干燥, Pt/SO₄^2-/ZrO₂-Al₂O₃, 烷烃, 加氢异构

CLC Number:

TQ032.4

LE Xiaoguang, XU Jun, SONG Yueqin, ZHOU Xiaolong. Effect of preparation conditions on isomerization performance of Pt/SO₄^2-/ZrO₂-Al₂O₃ catalyst[J]. Chemical Industry and Engineering Progree, 2015, 34(02): 419-424.

乐晓光, 徐俊, 宋月芹, 周晓龙. 制备条件对Pt/SO₄^2-/ZrO₂-Al₂O₃异构化性能的影响[J]. 化工进展, 2015, 34(02): 419-424.

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Effect of preparation conditions on isomerization performance of Pt/SO₄^2-/ZrO₂-Al₂O₃ catalyst

制备条件对Pt/SO₄^2-/ZrO₂-Al₂O₃异构化性能的影响

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