【摘要】 研究了ＣｕＹ，Ｃｕ－ＺＳＭ－５分子筛制备条件对ＮＯ直接分解活性的影响．结果表明，在不同酸碱度下交换的ＣｕＹ分子筛，在ｐＨ＝９时活性较好，而Ｃｕ－ＺＳＭ－５型在ｐＨ＝７时较好．随交换度提高，Ｃｕ－ＺＳＭ－５活性上升，而ＣｕＹ交换度达４５％后活性趋于平稳：用ＤＴＡ，ＴＰＤ，ＸＰＳ及ＩＲ等技术，对活性中心进行了研究，表明钢是以水合离子形式与分子筛中Ｎａ＋进行交换．Ｃｕ－ＺＳＭ－５的活性位单一，ＣｕＹ上则有两种ＮＯ吸附位．经４００℃焙烧后，铜优先占据Ｙ的β笼，此即活性位．未经焙烧的样品中铜主要以Ｃｕ２＋存在．４００℃抽空处理产生Ｃｕ＋．讨论了ＮＯ在含铜样品表面的反应过程．更多还原

【Abstract】 he effect of catalyst preparation condition on the catalytic activity for NO direct decomposition over CuY, CuZSM-5 was studied by use of quadrupole MS as means of activity measurement in a recycling low pressure reaction system. It was showed that the activity of catalysts prepared at different PH is best at pH=9 for CuY and at pH=7 for CuZSM-5 respectively. With the increase of exchange level of copperon, the activity of CuZSM-5 and CuY increases, but the activity of CuY dose not increase any longer after the exchange level reaches 45%.The characteristic of active sites was studied by using DTA, TPD, XPS and IR techniques. It was supposed that the copper as hydrated ionexchanges with Na+ of zeolites; only one kind of copper ion site locates in CuZSM-5 and two kinds locate in CuY; the copper ions firstly occupy the 3 cage of Y zeolite and the activity is provided by the copper ions in 3 cage; copper exists as cupric ions in fresh sample and cuprous ions appear through pretreatment at hightemperature in vacuum. Five kinds of NO adsorbed species were detected by in-situ IR at 20-350℃. Amongthe species, the NO+/Cu2+ was one of the active species.更多还原