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将纳米ZnO作为甲醇脱水制备二甲醚催化剂的组分,考察了纳米ZnO的含量对催化剂H4SiW12O40-La2O3/纳米ZnO∶γ-Al2O3催化活性的影响。采用TPD和BET等技术探讨分析了纳米ZnO的加入与催化剂结构和表面性质的关系。结果表明:纳米ZnO增大了催化剂的比表面,改善了催化剂的孔结构,提高了催化剂活性组分分散度,增大了中等强度的酸量,提高了甲醇的转化率;催化剂H4SiW12O40-La2O3/纳米ZnO∶γ-Al2O3(1∶3)有最佳催化活性。
The effect of nano-ZnO content on the catalytic activity of catalyst H4SiW12O40-La2O3 / nano-ZnO: γ-Al2O3 was investigated by dehydration of nano-ZnO as methanol to prepare dimethyl ether catalyst. The relationship between the addition of nano-ZnO and the structure and surface properties of the catalyst was analyzed by TPD and BET techniques. The results show that nano-ZnO increases the specific surface area of the catalyst, improves the pore structure of the catalyst, increases the dispersion of the active component of the catalyst, increases the acidity of the moderate intensity and increases the conversion of the methanol. The catalyst H4SiW12O40-La2O3 / The nano-ZnO: γ-Al2O3 (1: 3) has the best catalytic activity.