含Ni介孔分子筛的合成及其对苯加氢催化性能

Synthesis of Ni-containing mesoporous molecular sieves and its catalytic activity for benzene hydrogenation

采用水热法合成出不含镍和含镍的硅基介孔分子筛.利用XRD、FT-IR、TPR、TEM和比表面孔径测定等手段对样品进行了表征.结果表明:合成出有序性好的介孔分子筛(MCM-41),550℃焙烧可以将模板剂有效去除,所合成介孔分子筛负载Pt后介孔有序性降低,但是介孔结构仍然存在.苯催化加氢反应研究表明:不含Ni的介孔分子筛不具有加氢活性,当将其负载Pt后具有苯加氢催化活性;含Ni介孔分子筛本身具有苯加氢活性,含Ni介孔分子筛负载Pt后苯加氢催化活性有较大的提高,所有样品的环己烷选择性都接近100%,说明含Ni介孔分子筛可以直接作为苯加氢反应的催化剂或作为苯加氢催化剂良好的载体.

Silicon based mesoporous molecular sieves with hydrothermal method. The samples were characterized with or without nickel were synthesized by the XRD, FT-IR, TPR, TEM and BET. The results showed that the highly-ordered mesoporous molecular sieves were synthesized, and the template agent was efficiently removed after calcination at 550℃. After Pt-loading the ordering of mesoporous molecular sieves was decreased, however, the mesoporous structure was preserved. The results of benzene hydrogenation indicated that the mesoporous molecular sieve without Ni did not have any catalytic activity, but the Ptqoading mesoporous molecular sieves had catalytic activity. In addition, the Ni- containing mesoporous molecular sieve itself was catalytically active for benzene hydrogenation. After loading Pt on the Ni-containing mesoporous molecular sieve, the catalytic activity for benzene hydrogenation was enhanced. The selectivity of cyclohexane for all samples was nearly 100%. It can be concluded that the Ni containing mesoporous molecular sieves can be used as a catalyst or a good support for benzene hydrogenation.