无机化学综合标准-分析测试百科网

本标准规定了纳米合成水滑石中Mg与Al摩尔比（MgO 与 AlO摩尔比）、 Zn 与 Al 摩尔比（ZnO 与 AlO 摩尔比）、氧化镁、氧化铝、氧化锌、重金属（以 Pb 计）、铁（Fe）、pH值、白度、干燥减量（105 ℃）、激光粒径（D）、电镜平均粒径、团聚指数、比表面积和堆积密度的分析方法。本标准适用于纳米合成水滑石中上述理化数据的测定。

Methods of test for Nano-synthetic hydrotalcite

ICS: 71.060.01
CCS: G10
发布: 2006-07-26
实施: 2007-03-01

DL/T 582-2004 火力发电厂水处理用活性炭使用导则

Guide for operation of activated carbon for water treatment in thermal power plant

ICS: 71.060.01
CCS: G77
发布: 2004-10-20
实施: 2005-04-01

ASTM D3906-03(2008) 测定八面沸石型含沸石材料的相对X射线衍射强度的试验方法

Zeolites Y and X, particularly for catalyst and adsorbent applications, are a major article of manufacture and commerce. Catalysts and adsorbents comprising these zeolites in various forms plus binder and other components have likewise become important. Y-based catalysts are used for fluid catalytic cracking (FCC) and hydrocracking of petroleum, while X-based adsorbents are used for desiccation, sulfur compound removal, and air separation. This X-ray procedure is designed to monitor these Y and X zeolites and catalysts and adsorbents, providing a number more or less closely related to percent zeolite in the sample. This number has proven useful in technology, research, and specifications. Drastic changes in intensity of individual peaks in the XRD patterns of Y and X can result from changes of distribution of electron density within the unit cell of the zeolite. The electron density distribution is dependent upon the extent of filling of pores in the zeolite with guest molecules, and on the nature of the guest molecules. In this XRD method, the guest molecule H2O completely fills the pores. Intensity changes may also result if some or all of the cations in Y and X are exchanged by other cations. Because of the factors mentioned in 4.3 that could vary the intensities of the XRD peaks, this XRD method will provide the best determination of relative crystallinity when the reference and sample have a similar history of preparation and composition. Corrections are possible that can make this XRD method accurate for measuring percent zeolite in many specific situations. These corrections are well known to those skilled in X-ray diffraction. It is not practical to specify those corrections here.1.1 This test method covers the determination of relative X-ray diffraction intensities of zeolites having the faujasite crystal structure, including synthetic Y and X zeolites, their modifications such as the various cation exchange forms, and the dealuminized, decationated, and ultrastable forms of Y. These zeolites have cubic symmetry with a unit cell parameter usually within the limits of 24.2 and 25.0˚ ?/span> (2.42 and 2.50 nm). 1.2 The samples include zeolite preparations in the various forms, and catalysts and adsorbents containing these zeolites. 1.3 The term “intensity of an X-ray powder diffraction (XRD) peak” is the “integral intensity,” either the area of counts under the peak or the product of the peak height and the peak width. 1.4 This test method provides a number that is the ratio of intensity of portions of the XRD pattern of the sample to intensity of the corresponding portion of the pattern of a reference zeolite, NaY. (Laboratories may use a modified Y or X, for example, REY as a secondary standard.) The intensity ratio, expressed as a percentage, is then labeled “% XRD intensity/NaY.” 1.5 Under certain conditions such a ratio is the percent zeolite in the sample. These conditions include: 1.5.1 The zeolite in the sample is the same as the reference zeolite. 1.5.2 The ab......

Standard Test Method for Determination of Relative X-ray Diffraction Intensities of Faujasite-Type Zeolite-Containing Materials