氮化MCM-22分子筛的程序升温制备

THE PREPERATION OF NITROGEN-INCORPORATED MCM-22 THROUGH TEMPERATURE-PROGRAMMED ROUTE

利用程序升温的方法分别在700、800、900℃对除去和未除去模板剂的MCM-22分子筛进行高温氮化。结果表明，以2℃／min的升温速率进行氮化后的分子筛的N含量高于以5℃／min进行氮化的分子筛的N含量，含模板剂的分子筛氮化后的N含量要高于不含模板剂的分子筛氮化后的N含量。通过对比氮化前后分子筛的骨架红外谱图，在-1400cm^-1处发现1个随着N含量变化而变化的新峰，将其归属为-NH4特征峰。将氮化后的分子筛用于甲苯甲醇烷基化制对二甲苯的反应，发现甲苯的转化率明显提高。

The nitrogen-incorporated MCM-22 molecular sieves were respectively synthesized at 700, 800, 900℃ through temperature-programmed route. The nitrogen contents of samples nitrided at 2;C/min were higher than those of the samples nitrided at 5℃/min, and the nitrogen contents of samples with template before nitridation were also higher than that of the samples without template. Compared with the pure MCM-22, a new peak at -1400 cm^-1 changed with the nitrogen content was found in the FT-IR spectrum of nitrogen-incorporated sample, which were attributed to the -NHx. The sample nitrided at 800℃ was used in the alkylation of toluene and methanol and the reactive activity was found to be obviously improved.