【摘要】 以具有升华性质且易分解的乙酰丙酮铜为铜源,NH4Y分子筛为载体,采用蒸气浸渍法制备了CuY催化剂,考察了其对甲醇氧化羰基化合成碳酸二甲酯的催化性能,并采用XRD、H₂-TPR和NH3-TPD等表征手段研究了催化剂上铜物种的分散状态、催化活性中心的含量及催化剂的酸强度和浓度,发现铜物种在Y分子筛载体上高度分散,且Y分子筛载体的晶体结构保持完好。在N₂∶H₂=12∶1的气氛中,250℃还原得到的催化剂CuY/250催化活性中心含量最高,催化活性也达到了最佳,其甲醇转化率为11.1%,碳酸二甲酯的时空收率和选择性分别为200.5mg/（g·h）和60.3%。更多还原

【Abstract】 CuY catalysts were prepared by vapour impregnation with copper acetylacetonate as the copper source and NH₄Y zeolite as the support.The performance of the catalysts was evaluated by using direct vapor-phase oxidative carbonylation of methanol to dimethyl carbonate（DMC） as a model reaction.The surface dispersion,active component content,acid strength and concentration of the as-prepared catalysts were characterized by X-ray diffraction（XRD）,H₂-temperature programmed reduction（H₂-TPR） and NH₃-temperature programmed desorption（NH₃-TPD）,respectively.It was found that copper species were highly dispersed on the Y zeolite and the crystal structure of the Y zeolite remained intact.For the CuY/250 catalyst activated at 250℃ and in the atmosphere of N₂:H₂=12:1,the active component content was the highest and the catalytic activity was excellent.The obtained methanol conversion,space time yield and selectivity of dimethyl carbonate were 11.1%,200.5 mg/（g·h） and 60.3% respectively.更多还原