Xiong Guoxing

Interaction of NiO with γ-Al 2 O 3 Supporter of NiO/γ-Al 2 O 3 Catalysts

利用溶胶－凝胶法制备了不同含量的ＮｉＯ／γ－Ａｌ２Ｏ３催化剂，通过ＸＲＤ，ＸＰＳ和ＴＰＲ等技术考察了制备方法，ＮｉＯ含量和焙烧温度对催化剂结构和Ｎｉ存在状态的影响，发现溶胶－凝胶法制备的催化剂活性组分ＮｉＯ与担体γ－Ａｌ２Ｏ３间具有强相互作用。

Investigation of the atomization mechanism of copper in a graphite furnace using X-ray photoelectron spectroscopy

Abstract The valences of the copper compounds formed during the atomization process in a graphite furnace were determined by using X-ray photoelectron spectroscopy (XPS) in order to study the atomization mechanism of the analyte. From the results, we conclude that copper compounds in the argon atmosphere exist in the most stable states at a given temperature, and that the Cu-C bond cannot be formed during atomization. Copper compounds converted to the oxides during thermal pretreatment are initially reduced to liquid copper and then atomized in the rate determining step. The XPS technique, combined with other methods, is helpful to gain an insight into the atomization mechanism of the analyte.

CO adsorption on tio-containing ni surfaces: a molecular orbital study by DV-Xα methods

Abstract ‘Charge transfer’ and ‘dual site’ models were investigated by Discrete-Variational-Xα (DV-Xα) calculations on model clusters, CO-Ni4TiO and , for their possible role as catalytically active sites. It was found that the strong bonding interaction between metal atoms and support Ti cations decreases the ability of metal atoms to donate electrons to 2π∗ orbitals of adsorbed CO molecules, and the charge transfer from lower-valent Ti cations to metal makes very little contribution to the electronic donation from metal atoms to the adsorbed CO molecules. The calculations show that the ‘dual site’ model, in which the lower-valent Ti cations residing at the interface between metal and Ti oxide interact directly with the adsorbed CO molecules, has large potential in weakening the C-O bond.

Hydrogen Permeation in a Thin Pd-Cu Alloy Membrane Reactor for Steam Reforming of Ethanol

Hydrogen permeation through a thin fcc-pd(0.9)cu(0.1) alloy composite membrane was investigated with h(2)-ar-c(2)h(5)oh- h(2)o mixtures for this modeling reaction over a range of temperature (250-500 degrees c) and pressure (160-310 kpa) the influence of temperature, feed pressure. feed flow rate, ratio of ethanol to steam, and hydrogen concentration of feed was examined under the operating conditions ethanol has inhibitive effect on hydrogen permeation performance through the membrane in comparison with that in pure hydrogen atmosphere. moreover, hydrogen flux increased with mereasing total mixture pressure and hydrogen concentration in the mixture feed but was not related to the ratio of ethanol to steam thus, the inhibitive influence of ethanol on hydrogen permeation was similar to that of steam under the same operating conditions although ethanol and steam can decrease hydrogen permeation, the hydrogen flux of membrane up to 11 3 m(3)/(m(2) h) and hydrogen recovery over 62.5% were obtained in h(2)-ar-c(2)h(5)oh-h(2)o (h(2) ar (c(2)h(5)oh h(2)o) volume ratio = 60 30 10) mixtures at 500 c and 310 kpa the membrane was stable without poisoning under ethanol-containing mixtures and would be suitable for the catalytic membrane reactor of steam reforming of ethanol to pure hydrogen production