《Table 3Thermal properties of the samples.》

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《"以N,N’-二甲基乙二胺为模板剂合成磷酸硅铝分子筛DNL-6及其在催化中的应用（英文）"》

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The catalytic performance of DNL-6 samples was evaluated in the methanol amination reaction at reaction temperatures of260 and 300°C，methanol WHSV of 0.813 h-1，and n（ammonia）:n（methanol）=2:1.The steady-state catalytic results are illustrated in Table 4.The main products are MMA and DMA with all DNL-6 catalysts.Increasing the reaction temperature from 260 to 300°C could greatly improve the catalytic activity.However，the selectivity for MMA decreased obviously accompanied by an increase in DMA and TMA，due to an enhanced methylation reaction at elevated temperatures.H-DNL-6，with its ultrahigh silica content，induces the highest methanol conversion and selectivity for MMA plus DMA.Fig.8illustrates the changes in methanol conversion and product selectivity with time on stream for H-DNL-6 at 300°C.It is clear that the reaction is stable during the investigated period；further，methanol conversion is higher than 88%and selectivity for MMA plus DMA is greater than 85%.