Nanosized Composite Pt‐Ru Catalysts for Production of Modern Modified Fuels

A Pt‐Ru/2 % Ce/(θ+α)‐Al₂O₃ nanosized catalyst was developed for selective catalytic oxidation of CH₄ to synthesis gas. The process was carried out entirely with the formation of synthesis gas at high selectivity by H₂ and CO with H₂:CO = 2.0 ratio only at Pt:Ru = 2:1 or 1:1 atomic ratio and short contact time on Pt‐, Ru‐, and Pt‐Ru low‐percentage catalysts. Samples, which were reduced by H₂ at high temperature, presented a mixture of Pt‐, Ru‐, and Pt‐Ru nanosized particles, its alloy in the mixed catalysts. The correlation between experimental results and data of physicochemical research was established. The activity together with physicochemical properties and quantum chemical calculations for the developed low‐percentage Pt‐Ru catalysts was investigated.     

基于最小合成单元的维吾尔音库设计

为了实现容量小、可懂度和自然度较好的波形拼接式维吾尔语语音合成系统,结合维吾尔语的特点,完成了文本设计、录音、语音标注、以及音库建设过程。其中,把音节作为基本的合成单元建立了音节语音库;为了弥补音库中不存在音节的合成问题,又建立了音素作为合成单元的音素语音库。实验结果表明,以音节和音素为最小合成单元的波形拼接式维吾尔语语音合成系统除了音库容量相对少等特点之外,还具有良好的可懂度。     

Gas solid techniques for preparation of pure lanthanum hexaboride

The processes reported for the preparation of lanthanum hexaboride (LaB6) from lanthanum oxide involve the use of carbon either elemental or in the form of boron carbide or elemental boron itself as reducing agents, fused salts at high temperatures or reactions which require the product boride to be leached out. Each of these techniques either increases the process costs and/or increases chances of contamination in fi-nal product. Pure LaB6 can best be prepared by a reaction which produces a gaseous byproduct. In the present study, such a reaction was successfully used to yield pure lanthanum hexaboride. The process involved mixing of anhydrous lanthanum chloride with aluminium and boron and heating the charges under dynamic argon flow. Lanthanum chloride is known to be highly hygroscopic; hence the process using improperly dehydrated LaCl3 led to the formation of lanthanum oxychloride which does not convert to LaB6 under conditions wherein LaCl3 converts. Not only the formation of AlCl3 but also its continuous removal from the reaction zone is necessary for the success of the process.     

Results of acidizing injection wells on the Zhetybai field (Kazakhstan)

The article discusses the results of local acid treatment of key wells situated in the selected area of the deposit. This technique allows not only to recover well injection capacity, but also to increase the area sweep efficiency both according to the formation thickness and its strike, which helps to increase oil recovery.The method for effectiveness evaluation of the deposit stimulation technique has been proposed. It is based on calculation of formation system hydrodynamic characteristics with the account of well interference. Based on the geophysical well logging data (GWL), the area sweep efficiency is determined in accordance with the formation area and thickness.The proposed method has been implemented on the basis of the data of the Zhetybai (Kazakhstan) deposit.