Surface Modification of Nickel Sulfide Nanoparticles: Towards Stable Ultra-Dispersed Nanocatalysts for Residue Hydrocracking
Surface Modification of Nickel Sulfide Nanoparticles: Towards Stable Ultra-Dispersed Nanocatalysts for Residue Hydrocracking
复制标题
硫化镍纳米颗粒的表面改性：用于渣油加氢裂化的稳定超分散纳米催化剂
DOI：
10.1002/cctc.201600092
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发表时间：
2016
期刊：
影响因子：
4.5
通讯作者：
Liu Hualong
中科院分区：
文献类型：
--
作者：
Du Hui;Liu Dong;Wu Hao;Xia Wei;Zhang Xiaodong;Chen Zhaojun;Liu Yongjiu;Liu Hualong
采用反相微乳液法制备了粒径为5-8 nm的超细硫化镍纳米粒子（NSNPs），并通过油酸和正十二烷醇取代表面活性剂对其进行改性。实验结果表明，在修饰过程中，NSNPs的粒径和晶体结构没有发生明显变化。与表面活性剂与NSNPs之间的静电吸引吸附不同，油酸和1-十二烷硫醇通过化学吸附牢固地吸附在NSNPs上。催化加氢裂化试验表明，表面改性提高了NSNP的加氢裂化活性。表面活性剂涂覆的NSNP以20-30 nm的团聚体分散在甲苯不溶性产物中，而改性的NSNP主要以其原始尺寸分散。 结果表明，油酸和1-十二烷硫醇在NSNPs上的化学吸附保持稳定，并在高温高压下保持NSNPs的稳定分散。
Ultra‐small nickel sulfide nanoparticles (NSNPs) of 5–8 nm are prepared by a reverse microemulsion route and then modified by oleic acid and 1‐dodecanethiol to replace the adsorbed surfactant. Experimental results reveal that the particle size and crystal structure of the NSNPs did not change significantly during the modification process. Different from the adsorption by the electrostatic attraction between the surfactant and NSNPs, oleic acid and 1‐dodecanethiol are adsorbed firmly on the NSNPs through chemisorption. Catalytic hydrocracking tests demonstrate that the surface modification enhances the hydrocracking activity of the NSNPs. The surfactant‐coated NSNPs disperse in toluene‐insoluble products in as agglomerates of 20–30 nm, whereas the modified NSNPs mainly disperse as their original size. The results prove that the chemisorption of oleic acid and 1‐dodecanethiol on NSNPs remains steady and maintains the stable dispersion of NSNPs under high temperature and pressure.