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中文摘要：
在氧气气氛中，对氧化钨改性的不同分子筛催化剂上二甲醚（DME）转化反应进行了评价。结果表明，WO3／HZSM-5催化剂上DME可以高选择性转化为甲苯，对其反应工艺条件进行了优化，常压、290℃、DME／O，比为2：l时，二甲醚几乎完全转化，转化率为98．97％，甲苯的选择性达到39．7l％。对催化剂结构和酸性进行表征，结果表明，ZSM-5分子筛的孔道结构最有利于甲苯的生成，WO3的介入调整了HZSM-5分子筛表面的酸性活性位点分布，在氧气气氛中有效地抑制了副产物的生成，使产物中甲苯的选择性提高。
英文摘要：
The catalytic performance of various zeolites modified with tungsten oxide in the conversion of dimethyl ether （DME） to toluene in the presence of oxygen was investigated in a continuous flow fixed-bed reactor. The results indicated that WO3/HZSM-5 as a catalyst is highly selective in the conversion of DME to toluene; under the optimized conditions, i.e. atmospheric pressure, 290℃, and with a DME/O2 mol ratio of 2 ： 1, the conversion of DME is 98.97 %, with the selectivity of 39.71% to toluene. The characterization results about the catalyst structure and acidity illustrate that the porous structure of ZSM-5 is suitable for the formation of toluene from DME. The doping of WO3 adjusts the distribution of the surface acid sites and then inhibits the formation of side-products in the presence of oxygen, which is able to enhance the selectivity to toluene.
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