CAJ | 학술논문

采用沉淀法制备了Pt/SO42?/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 SO42?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SO42?添加顺序对PtSZA异构化性能没有明显影响。
채용침정법제비료Pt/SO42?/ZrO2-Al2O3(PtSZA)최화제，고찰료경양화고수응효간조속솔、고염농도、박함량、Al2O3화 SO42?첨가순서등제비조건대 PtSZA 이구화성능，우기시저온이구화성능적영향，병용 XRD 화TG대최화제진행료표정。결과표명，제고수응효적간조속솔강저료PtSZA최화제중적류함량，대대제고료최화제중적단사상，진이도치료최화제저온실활가속이급고온활성하강。교저혹교고적고염농도열화료 PtSZA 적저온이구화은정성，이0.4～0.6mol/L초산양고제비적최화제류함량화사방상양화고함량교고，이구화활성상대교호，Al2O3화SO42?첨가순서대PtSZA이구화성능몰유명현영향。
Pt/SO42?/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/SO42?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 SO42? on isomerization performance was negligible.