本文選題：分級(jí)結(jié)構(gòu) + 多孔碳材料�。� 參考：《浙江理工大學(xué)》2015年碩士論文

【摘要】：近些年來，由于環(huán)境問題越來越受到人們的重視，發(fā)達(dá)國家的法律法規(guī)已經(jīng)對(duì)燃料中的含硫量開始制定相關(guān)政策，并要求燃料中的含硫量低到一定程度。所以，針對(duì)如何對(duì)燃料中的含硫物進(jìn)行脫硫處理的研究顯得日益重要。傳統(tǒng)的加氫脫硫法由于存在能耗大，并存在對(duì)燃料中噻吩及噻吩的衍生物脫除效果較差等缺點(diǎn)。而吸附脫硫法通過使用不同的吸附劑，或者通過對(duì)吸附劑進(jìn)行改性等方面的研究來提高吸附劑的吸附性能。因此設(shè)計(jì)合成具有高比表面積、優(yōu)越的多孔性等吸附劑成為研究的重點(diǎn)。對(duì)于體積較大的多孔固體，一般來說，在小孔徑孔中的擴(kuò)散是吸附過程的主要限速步驟。因此將多孔吸附劑設(shè)計(jì)成分級(jí)結(jié)構(gòu)，如多孔碳納米球、大孔-介孔復(fù)合的多孔碳等，可有效縮短吸附質(zhì)在小孔中的擴(kuò)散程，從而提高吸附速率，這是非常有意義的。本論文主要以分級(jí)結(jié)構(gòu)多孔碳吸附劑為研究對(duì)象，采用不同的方法制備合成了一系列具有高比表面積，分級(jí)結(jié)構(gòu)的多孔碳材料吸附劑。同時(shí)，運(yùn)用了SEM，TEM，N2吸附-脫附等技術(shù)對(duì)分級(jí)結(jié)構(gòu)多孔碳材料的結(jié)構(gòu)進(jìn)行表征，并研究了其吸附燃料中二苯并噻吩的吸附性能。具體的研究?jī)?nèi)容如下： 1.以MgO小球?yàn)槟０�，酚醛樹脂為碳源制備多孔碳材料，在�?jīng)KOH/C質(zhì)量比為4:1活化后獲得大孔-介孔復(fù)合孔結(jié)構(gòu)碳材料，擁有最大的比表面積（1502.7m2g-1）和孔道體積（1.05cm3g-1），該材料在吸附DBT的實(shí)驗(yàn)中可以在10分鐘內(nèi)達(dá)到吸附平衡，吸附動(dòng)力學(xué)擬合遵循準(zhǔn)二階動(dòng)力學(xué)模型，且最大吸附量可以達(dá)到153.6mg g-1。 2.利用水熱法制備的葡萄糖納米微球在經(jīng)過ZnCl2/C的質(zhì)量比為4:1活化后的分級(jí)結(jié)構(gòu)葡萄糖碳球擁有最高的比表面積（3050.8m2g-1）和孔道體積，其在吸附DBT的實(shí)驗(yàn)中可以在30分鐘左右達(dá)到吸附平衡，吸附動(dòng)力學(xué)遵循偽二級(jí)動(dòng)力學(xué)模型，吸附等溫線擬合為Freundlich擬合且最大吸附量可以達(dá)到121mg g-1。 3.以甲醛、間苯二酚等為原料制備酚醛樹脂球，在經(jīng)ZnCl2/C質(zhì)量比為4:1活化的分級(jí)結(jié)構(gòu)酚醛樹脂碳球擁有最高的比表面積（2839.7m2g-1）和孔道體積，其在吸附DBT的實(shí)驗(yàn)中可以在10分鐘左右達(dá)到吸附平衡，吸附動(dòng)力學(xué)遵循準(zhǔn)二階動(dòng)力學(xué)模型，，吸附等溫線擬合為L(zhǎng)angmuir擬合且吸附量可以達(dá)到220mg g-1。
[Abstract]:In recent years, due to more and more attention to environmental problems, the laws and regulations of developed countries have begun to formulate relevant policies on sulphur content in fuel, and require the sulphur content in fuel to be as low as a certain degree. Therefore, it is increasingly important to study how to desulphurize sulfur in fuel. The traditional hydrodesulfurization method has the disadvantages of high energy consumption and poor removal efficiency of thiophene and thiophene derivatives in fuel. By using different adsorbents or modifying the adsorbents, the adsorption properties of adsorbents can be improved by adsorption desulfurization. Therefore, the design and synthesis of adsorbents with high specific surface area and excellent porosity have become the focus of research. For large porous solids, diffusion in small pore pores is the main speed limiting step in the adsorption process. Therefore, it is very meaningful to design porous adsorbents into hierarchical structures, such as porous carbon nanospheres, macroporous mesoporous composite porous carbon and so on, which can effectively shorten the diffusion process of adsorbents in micropores and thus increase the adsorption rate. In this paper, a series of porous carbon adsorbents with high specific surface area and graded structure were synthesized by different methods. At the same time, the adsorption and desorption of dibenzothiophene in fuel were studied by means of SEM-TEMN _ 2 adsorption and desorption techniques. The specific contents of the study are as follows: 1. Porous carbon materials were prepared by using MgO microspheres as template and phenolic resin as carbon source. The macroporous mesoporous composite carbon materials were obtained by activation at 4:1 of KOH/C mass ratio. The material has the largest specific surface area of 1502.7m2g-1) and the pore volume of 1.05cm3g-1.The adsorption equilibrium of the material can be achieved in 10 minutes in the experiment of adsorption of DBT. The adsorption kinetic fitting follows the quasi-second-order kinetic model, and the maximum adsorption amount can reach 153.6mg g-1. 2. The glucose nanospheres prepared by hydrothermal method have the highest specific surface area (3050.8m2g-1) and pore volume after ZnCl2/C activation at 4:1. In the experiment of adsorption of DBT, the adsorption equilibrium can be achieved in about 30 minutes, the adsorption kinetics follows pseudo-second-order kinetic model, the adsorption isotherm is fitted by Freundlich and the maximum adsorption amount can reach 121mg g-1. 3. Phenolic resin spheres were prepared from formaldehyde, resorcinol and other raw materials. The graded phenolic resin carbon spheres, activated at 4:1 by mass ratio of ZnCl2/C, had the highest specific surface area of 2839.7 m2g-1) and pore volume. In the experiment of adsorption of DBT, the adsorption equilibrium can be achieved in about 10 minutes, the adsorption kinetics follows the quasi-second-order kinetic model, the adsorption isotherm is fitted by Langmuir and the adsorption amount can reach 220mg g-1.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ424;TQ127.11

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本文編號(hào)：1943846