Service and regulatory announcements.

Contains Notices of quarantine and Plant quarantine decisions, formerly issued as separate publications only, now published in both forms.

FAS quarterly reference guide to world horticultural trade /

Title from cover.

Wood use : U.S. competitiveness and technology.

"OTA-M-224"--Vol. 2, p. [4] of cover.

JEFFI [microform] : a simplified, Lotus-based cash flow analysis program /

"July 1993"--P. [2] of cover.

Georgia forest resources and industries /

Mode of access: Internet.

Northern Idaho forest resources and industries /

Mode of access: Internet.

North Carolina forest resources and industries /

Contribution from Forest Service.

South Carolina forest resources and industries /

"November 1944."

List of chemical compounds authorized for use under USDA inspection and grading programs /

Description based on: 1981.

Focus on research : a look into wood utilization research activities of the Forest Service.

"Issued April 1964"--Cover, p. [2].

Export certification manual.

Includes index.

Electronic structure methods applied to gas-carbon reactions

A review is given on the fundamental studies of gas-carbon reactions using electronic structure methods in the last several decades. The three types of electronic structure methods including semi-empirical, ab initio and density functional theory, methods are briefly introduced first, followed by the studies on carbon reactions with hydrogen and oxygen-containing gases (non-catalysed and catalysed). The problems yet to solve and possible promising directions are discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.

Zr-Laponite pillared clay-based nickel catalysts for methane reforming with carbon dioxide

Zr-Laponite pillared clays were prepared and used as supports of nickel catalysts for the methane reforming reaction with carbon dioxide to synthesis gas. The structural and textural characteristics of supports and catalysts were systematically examined by N-2 adsorption/desorption and X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron spectroscopy (TEM) techniques. The catalytic performance and carbon deposition were investigated. It is found that Zr-Laponite pillared clays are promising catalyst supports for carbon dioxide reforming of methane. The pore structure and surface properties of such supports greatly affect the catalytic behaviors of catalysts derived. Carbon deposition on catalysts was also affected by the property and structure of supports. The sintering of nickel metal and zirconia was another factor responsible for catalyst deactivation. This new-type nickel supported catalyst Ni/Zr-Laponite(8), with well-developed porosity, gave a higher initial conversion and a relatively long-term stability, and is therefore a promising catalyst for potential application to carbon dioxide reforming of methane to synthesis gas. (C) 2002 Elsevier Science B.V All rights reserved.