Effective Coke Removal in Methane to Benzene (MTB) Reaction on Mo/HZSM-5 Catalyst by H2 and H2O Co-addition to Methane

The catalytic dehydro-aromatization reaction over Mo/HZSM-5 catalyst was drastically stabilized by the co-addition of 5.4% H₂ and 1.8% H₂O to methane feed at 750 °C, 0.3 MPa and methane space velocity of 3000 mL g⁻¹ h⁻¹, suppressing the coke formation effectively, compared with single hydrogen or steam addition.     

水中热媒含量测试方法探讨

本文通过对聚酯装置水体中热媒含量分析 ,提出一种快速、简便的新的测试方法 ,,用色谱定性分析 ,用重量法定量测其浓度 ,对准确掌握装置设备运行情况 ,防止热媒泄漏 ,具有较强的指导意义     

十二烷基－二甲基（2－羟基）乙基氯化铵系列季铵盐的缓蚀性能

通过失重法和极化曲线、线性极化两种电化学方法，研究了十二烷基二甲基（２－羟基）乙基氯化铵（１２２）、十四烷基二甲基（２－羟基）乙基氯化铵（１４２）和十六烷基二甲基（２－羟基）乙基氯化铵（１６２）对２０＃碳钢在５％盐酸中的缓蚀作用。并与新洁尔灭（十二烷基二甲基苄基溴化铵）进行了比较。结果表明，它们在酸性介质中具有很好的缓蚀作用。     

Cell-free synthetic biology in the new era of enzyme engineering

With the gradual rise of enzyme engineering, it has played an essential role in synthetic biology, medicine, and biomanufacturing. However, due to the limitation of the cell membrane, the complexity of cellular metabolism, the difficulty of controlling the reaction environment, and the toxicity of some metabolic products in traditional in vivo enzyme engineering, it is usually problematic to express functional enzymes and produce a high yield of synthesized compounds. Recently, cell-free synthetic biology methods for enzyme engineering have been proposed as alternative strategies. This cell-free method has no limitation of the cell membrane and no need to maintain cell viability, and each biosynthetic pathway is highly flexible. This property makes cell-free approaches suitable for the production of valuable products such as functional enzymes and chemicals that are difficult to synthesize. This article aims to discuss the latest advances in cell-free enzyme engineering, assess the trend of this developing topical filed, and analyze its prospects.     

Mechanisms of non-toxic anticorrosive pigments in organic waterborne coatings

Investigations have been carried out concerning the mechanism of the behaviour of non-toxic anticorrosive pigments belonging to the group of phosphates, ferrites and ion exchange pigments in waterborne systems. The mechanism controlling the protective effectiveness of organic coatings is complex and results from simultaneous activity of various agents, from among which the kind of the corrosion inhibitor and the structure of the coating are of fundamental importance. The effect of pigments on the protective properties of coatings was tested by means of electrochemical impedance spectroscopy (EIS), scanning vibrating electrode technique (SVET) as well as the salt spray and Prohesion tests. For the investigation of the structure of coatings the porosymetric method and modulated-force thermomechanical analysis (mf TMA) were applied. The results of these investigations have shown that calcium zinc phosphate and zinc ferrite are the most effective. These pigments take part in the passivation of steel, which has been proved by the results of electrochemical investigations and by the presence of the passive layers as has been found out by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDXA) and scanning electron microscopy (SEM). Calcium zinc phosphate and zinc ferrite affect the structure of the coatings, increasing the glass transition temperature (Tg) of the coatings. Zinc phosphate and calcium-exchanged silica do not act in compliance with electrochemical mechanism neither do they improve the barrier properties of the binder.     

开拓创新 打造精品——纪念《中国涂料》创刊20周年

祝贺《中国涂料》创刊20周年!我在去年庆祝中国涂料工业协会成立20周年的纪念文章中,曾以《中国涂料》创办和成长的过程为例,说明中国涂料工业协会在20年中开拓进取、发展壮大,为国家、涂料行业和企业的前进做出的努力和辉煌的业绩。今年又迎来了《中国涂料》创刊20周年。20年来,《中国涂料》的成就是有目共睹的。积极探索、传播和交流涂料行业内外相关的经济、技术和管理各方面信息和经验,为促进行业发展做了大量扎实有效的工作。现在已办成在国内外涂料界具有特色和声誉的专业刊物。《中国涂料》坚持为行业、为企业服务的宗旨。作为中国涂…     

力化学法制备金属－NR硫化粘合用CSM－NR接枝聚合物

用开炼机，通过力化学方法，将ＮＲ／ＣＳＭ（质量比为１０／９０）制成４５￣＃钢－ＮＲ硫化粘合剂用接枝聚合物。当橡胶本体１００％破坏时，１８０°剥离强度为２３．６～２４．６ｋＮ／ｍ。     

Template synthesis of novel porous carbons using various types of zeolites

As previously reported, high surface area microporous carbons with long-range order can be synthesized by using zeolite Y as a template. In this work, an attempt is made to synthesize porous carbon using several other types of zeolites (zeolite β, ZSM-5, mordenite and zeolite L). Special attention is paid to whether the structural regularity of each zeolite can be transferred to the carbon structure as well as with the case of zeolite Y. The carbon filling method was then examined to see which gives the highest regularity to the carbon structure. It has been found that the optimum carbon filling method for zeolite Y is not an optimum one for the other zeolites and the degree of the regularity of long-range ordering in the carbons strongly depends on zeolite type. The order of the regularity in the resultant carbons is zeolite β>>zeolite L>mordenite>ZSM-5. The effect of zeolite type on the regularity is discussed in relation to the size and the shape of the zeolite channels.     

反式 -1,4-聚异戊二烯相对分子质量的调节

采用负载钛本体沉淀聚合法,以氢气作链转移剂,制备了不同相对分子质量的反式-1,4-聚异戊二烯(TPI),讨论了老化、氢气调节及塑炼对其相对分子质量的影响,以及不同相对分子质量TPI的结构与性能。结果表明,本体系合成TPI的数均相对分子质量为(5～15)×104,相对分子质量分布为2.00～3.00;门尼粘度为20～120时,随着TPI相对分子质量的降低,其结晶速度提高,结晶度无明显变化,拉伸强度明显降低,扯断伸长率、屈服强度和邵尔A型硬度无明显变化。     

短纤维直径对橡胶复合材料性能的影响

制备了 3种具有不同直径、相同长径比及其分布的涤纶短纤维增强氯丁橡胶基复合材料。对屈服强度及伸长率、断裂强度及伸长率以及撕裂强度等力学性能的研究发现 :在相同长径比及其分布情况下 ,与传统混合法则不同的是屈服强度和伸长率不相等 ,也不是只取决于短纤维的直径 ,而是受直径和长度的共同作用 ;在相同的纤维体积分数时 ,复合材料的断裂强度基本相同 ,而断裂形变和撕裂强度随纤维直径的减小而增大