合成邻苯基苯酚的催化剂的制备及性能研究
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摘要
以环己酮为原料,制备出环己酮二聚物(环己烯基环己酮)。以贵金属Pd、和Pt为活性组分,选择了HZSM-5,γ-Al_2O_3及覆炭γ-Al_2O_3(CCA)为载体,制备出脱氢催化剂用于环己烯基环己酮为原料的脱氢,合成邻苯基苯酚(OPP),对影响催化剂性能的诸多因素进行了较为系统的研究。
     以离子交换方式制备的Pd/HZSM-5催化剂,经过还原后,Pd有较好的分散度,w(Pd)=0.9%的Pd/HZSM-5催化剂对环己酮二聚物的脱氢活性为95%,OPP的选择性为90%。采用浸渍法制备出Pt/γ-Al_2O_3催化剂,通过添加助催化剂K_2SO_4和K_2O对其进行改性,使催化剂的性能得到了提高。当w(Pt)=0.3%~0.5%时,Pt/γ-Al_2O_3对环己酮二聚物的脱氢活性达到95%以上,OPP的选择性也大于90%。催化剂的组成为[w(Pt)=0.3%,w(K_2SO_4)=2%]的Pt/γ-Al_2O_3催化剂,在温度350℃、控制氢气流速为50mL/min,二聚物的滴料速度为7mL/h,催化剂的起始脱氢活性可达到96.4%,OPP的收率超过90%。
     以环己烯作裂解原料,制备出新型的覆炭载体CCA。在温度一定的情况下,γ-Al_2O_3上覆炭量与时间呈线性关系。在400℃~650℃范围内,随反应温度的升高,覆炭量呈指数增高,覆炭量随时间而增加。通过表面结构分析,CCA载体比表面积有所增加,微孔孔径分布趋于均匀。[w(Pt)=0.5%、w(K_2O)=1%]的Pt/CCA催化剂,连续使用100h后对环己酮二聚物的脱氢活性仍可达到95%,OPP的选择性保持相对稳定。以m(CS_2):m(Pt)=1∶100对催化剂预中毒后,连续使用200h,OPP的收率仍在90%以上。XPS的分析结果表明,在催化剂表面上的S的2P_3电子的结合能由165ev升高至169ev,S可能参与抑制了脱氢过程中的H的转移,降低了氢解反应,提高了OPP的选择性。
     采用精馏、重结晶工艺精制OPP,OPP的质量纯度为99.8%以上。采用一锅合成法,将OPP与过量的PCl_3反应,合成9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO)and 2’-hydroxydiphenyl-2-phosphinic acid(HPPA)混合物,产品收率为96.9%(以OPP为基准)。不需真空精馏等操作,无需分离中间产物。
Cyclohexenylcyclohexanone was prepared from cyclohexanone. o-Phenylphenol was made from cyclohexenyl cyclohexanone by dehydrogenation reaction. The noble metal (Pd or Pt) supported on HZSM-5 and r -Al2O3 or CCA respectively using as dehydrogenation catalysts were prepared. The factors that could influence catalysts' properties were studied by the numbers.
    Pd/HZSM-5 was prepared by method of iron-exchanged reaction, Pd could be dispersed better on the catalyst after deoxidizing. The cyclohexenylcyclohexanone conversion rate and the selectivity of OPP were more 95% and 90% respectively, while Pd/HZSM-5 catalyst in an amount of w(Pd) = 0.9%. K2SO4 or K2O as assistant agent were used for Pt supported by Y -Al2O3 catalyst. The results showed that: catalyst consist as [w(Pt)=0.3% w(K.2SO4)=2%], the initiative conversion rate of cyclohexenylcyclohexanone is more 96% and the yield of OPP is as high as 90% in a certain reaction condition ,which temperature is 350 C and flux of H2 is 50mL/min,adding rate is 7mL/h.
    CCA carrier was prepared by cyclohexene cracked to carbon compound over the r -Al2O3 under higher temperature 400C-650C. The amount of carbon-covered has linear relation with time when temperature is determined. With temperature rising, the total amounts of carbon-covered has exponential relation with temperature. Through BET surface structure analysis ,CCA has more SSA than that of Y -AI2O3 and it's pore diameter distributing is tend to equality. When the catalyst Pt/CCA [w(Pt)=0.5% w(K2O)=l%] was lasted used 100h,the dehydrogenation convert of rate for cyclohexenylcyclohexanone is 95%,and the selectivity of OPP keep stabilization. When the catalyst was pre-poisoned by CS2 which amount of CS2 be controlled under [m(CS2): m(Pt)=1:10] the yield of OPP is more 90% after lasted using 200h. The results of XPS analysis showed that the S 2P3 electron bring energy rose to 169ev from normal 165ev, it is possible that S has play participate to restrain H transfer in the process of dehydrogenation so as to reduce
     hydrogenolysis and promote
    selectivity of OPP.
    OPP was refined by rectify and recrystal technology and purity add to 99.8%. DOPO and HPPA are synthesized with phosphorous trichloride and o-phenylphenol by an "one-pot" method without isolating intermediate products and avoiding a distillation step.
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