乙醇-盐酸辅助脱模制备Ni/Al-KIT-6介孔催化剂及其正庚烷异构性能

采用乙醇-盐酸萃取辅助高温焙烧法(萃取 焙烧两步法)脱除模板剂(聚环氧乙烷(PEO) 聚环氧丙烷(PPO) 聚环氧乙烷聚合物,P123),经金属Al原位掺杂改性,水热晶化法合成了一种具有蠕虫状形貌的Al/KIT-6介孔分子筛,使用浸渍法制备了不同镍负载量的Ni/Al-KIT-6金属-酸双功能催化剂。采用XRD、N₂吸附-脱附、NH₃-TPD、IR、SEM和TEM等表征手段对Al-KIT-6分子筛及催化剂样品进行物化性能分析,并以正庚烷为反应原料,对Ni/Al-KIT-6催化剂样品进行正庚烷异构化反应性能评价。结果表明：采用萃取 焙烧两步法可以有效脱除模板剂,相比于常规焙烧法和萃取法脱除模板剂制备的分子筛样品,萃取-焙烧两步法脱除模板剂制备的KIT-6分子筛样品具有更大的比表面积、孔体积,同时孔径分布更加均一;分子筛骨架中掺杂Al原子增加了分子筛的酸性;在氢气流速30 mL/min、重时空速7.6 h^-1、反应温度190 ℃、反应时间3 h,常压的条件下,镍负载质量分数为5%的Ni/Al-KIT-6催化剂作用下进行庚烷异构化反应,正庚烷转化率最高为26.8%,异庚烷选择性高于99.5%。     

改性硅藻土及PDMS对环氧涂层的阻垢耐蚀性能的影响

利用氨基硅油改性的硅藻土(Si-ASO),结合聚二甲基硅氧烷(PDMS)设计了一种有机硅环氧树脂基(EP)复合功能涂层(EP/Si-ASO/PDMS)用于金属表面的防垢和防腐。采用扫描电镜、电化学测试、摩擦测试等对涂层性能进行表征。结果表明,EP/Si-ASO/PDMS复合涂层具有独特的防垢性能,涂层表面的CaCO₃沉积量与EP/Si涂层相比减少了45%。耐腐蚀试验证明EP/Si-ASO/PDMS复合涂层具有优异的耐蚀性,制备的EP/Si-ASO/PDMS复合涂层在3.5% NaCl溶液中浸泡34 d后仍然保持着较高的阻抗模量(10¹⁰ Ω/cm²左右)。摩擦实验表明EP/Si-ASO/PDMS复合涂层具有良好的耐摩擦性,经过5000转摩擦后,质量损失仅为EP/Si涂层的26.47%。     

Production of aryl oxygen-containing compounds by catalytic pyrolysis of bagasse lignin over LaTi_(0.2)Fe_(0.8)O_3 prepared by different methods

To realize the resource and high-value utilization,a new approach,named bagasse lignin(BL) used to produce aryl oxygen-containing compounds by catalytic pyrolysis over perovskite,was proposed,LaTi_(0.2)Fe_(0.8)O_3(LTF) samples prepared by the sol-gel method(SG) and the solid-state reaction method(SS)were characterized.The catalytic action on BL pyrolysis was performed by the test of TG-DTG and the evaluation of the fixed bed micro-reactor,the components and contents of the products were determined.The results show that LTF samples have cubic perovskite phase,LTF prepared by SG(LTF-SG) is porous with larger specific surface area than LTF prepared by SS(LTF-SS).During the pyrolysis of BL,the addition of LTF lowers the pyrolysis temperature and the activation energy,the contents of CO_2 and CO in gaseous products reduce by 4.6%-8.0% and 30.7%-34.3%,respectively,the total content of aryl oxygencontaining compounds(including phenolics,guaiacols,syringols and phenylates) in liquid products increases from 62 wt% to more than 72 wt%,and LTF-SG shows better catalytic performance.LTF samples have nice phase and catalytic stabilities for BL pyrolysis after five successive redox cycles.     

新型碳纳米材料用于有机防腐涂层的研究进展

综述了碳纳米材料用于腐蚀防护中的研究进展,重点介绍了几种碳纳米材料,包括富勒烯、碳纳米管、碳纳米纤维、石墨烯、石墨炔以及碳点.碳纳米材料具有优异润滑性能、导电导热性能和屏蔽性能等,在涂层防护领域具有广阔应用前景.具有二维片层结构的碳纳米材料,可在涂层内部构建多重高效屏障,有效提升涂层的屏蔽性能.碳纳米材料的表面存在负电荷,可有效地抑制氯离子和氢氧根离子的渗透过程,降低涂层与金属界面间的阴离子浓度,减缓涂层与金属界面发生腐蚀的几率.碳纳米材料本身具有润滑性能,可实现减摩,提升涂层的耐磨性能.此外,对碳纳米材料涂层的制备、性能及防腐机理等进行了详细阐述,对碳纳米材料在有机防腐涂层中的发展前景进行了展望.     

Effect of surfactant on the co-electrodeposition of the nano-sized ceria particle in the nickel matrix

The nickel–ceria (Ni–CeO₂) nanocomposite coatings have been pulse electrodeposited from a Watts-type electrolyte containing nano-sized CeO₂ particles produced by high-energy ball milling technique (HEBM). Sodium Lauryl Sulphate (SLS) has been added in the electrolyte as a cationic surfactant. The effects of the surfactant on the zeta potential, co-deposition and distribution of ceria particles in the nickel matrix and hardness of composite coatings have been investigated. Experimental results show that the addition of SLS up to 0.10 g/l increases the amount of co-deposited ceria particles in the nickel matrix and microhardness of the nanocomposite. However, when the amount of SLS in the electrolyte is more than 0.1 g/l, there is a tendency to form agglomerates of ceria particles in the nickel matrix resulting no further increase in hardness of the Ni–CeO₂ nanocomposite coatings.     

改性氧化铈/钨酸镍环氧防腐涂层的制备及性能

采用水热法制备出不同质量比的氧化铈/钨酸镍(CeO₂/NiWO₄)的复合粒子,再选用硅烷偶联剂KH560对其进行改性,利用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）表征了复合粒子的结构与形貌。将改性的复合粒子分散于环氧树脂（EP）中,然后喷涂在碳钢基体上制备CeO₂/NiWO₄/EP复合涂层,利用电化学交流阻抗（EIS）、加速浸泡实验和摩擦磨损试验（Taber）测试涂层的防腐与摩擦性能。结果表明：添加CeO₂/NiWO₄复合粒子的环氧树脂涂层的防腐耐磨性能大幅度提高,而且当复合粒子中CeO₂与NiWO₄的质量比为4∶3时,涂层防腐耐磨性能最好,该复合环氧涂层在3.5%NaCl水溶液中浸泡后期(45天)仍保持较高的阻抗模量(7.36×10⁸ Ω/cm²),比纯环氧树脂涂层高一个数量级。同时,经过10000转摩擦磨损后,此复合涂层的质量损失较纯环氧涂层减少56%,厚度损失量仅为CeO₂/EP的50%,表现出最优异的防腐耐磨性能。