本文選題：碳納米管 + 金屬鎳��； 參考：《湖北工業(yè)大學(xué)》2017年碩士論文

【摘要】：碳納米管(CNTs)因具有一系列優(yōu)異的物理、化學(xué)特性已被廣泛的應(yīng)用在場發(fā)射、能源電池等領(lǐng)域,其同時也是一種性能優(yōu)異的催化劑載體材料;甲烷化反應(yīng)是將合成氣轉(zhuǎn)化成甲烷的重要過程,過程中采用的催化劑對甲烷化反應(yīng)的進行非常重要;鎳是一種資源豐富的金屬元素,同時也是一種性能優(yōu)異的甲烷化反應(yīng)催化劑。因此本文擬以碳納米管作為載體來負載金屬鎳,并對通過不同工藝制備的Ni/CNTs催化劑的結(jié)構(gòu)及催化性能進行系統(tǒng)的研究,主要結(jié)論如下:(1)采用化學(xué)鍍法、水熱法、沉淀法以及浸漬法制備了Ni/CNTs催化劑,通過對制備過程的放大可行性以及所制備碳納米管負載金屬鎳催化劑中金屬鎳顆粒的分散情況以及平均粒徑進行綜合考慮,認為采用浸漬法來制備Ni/CNTs更具有實際使用意義。(2)對采用浸漬法制備Ni/CNTs的過程進行系統(tǒng)的考察探索,發(fā)現(xiàn)CNTs的預(yù)處理過程、鎳前驅(qū)體的選擇、浸漬工藝以及熱處理工藝對Ni/CNTs的催化性能影響較大,制備Ni/CNTs的最佳工藝條件為:碳納米管預(yù)處理采用50 wt.%的硝酸進行回流處理、鎳前驅(qū)體選擇醋酸鎳或者乙酰丙酮鎳、浸漬時間選擇為24小時至36小時、干燥過程選擇40℃、60℃及紅外光處理的三段干燥流程、焙燒溫度為300℃,還原溫度為500℃。(3)對在最佳制備過程下制備的Ni/CNTs的活性組分最佳負載量以及催化工藝條件進行了優(yōu)化研究,其催化CO甲烷化的最佳鎳負載量為14 wt.%,催化反應(yīng)的最佳工藝為:原料氣中n(H2)/n(CO)為3,反應(yīng)溫度為550℃、反應(yīng)壓力為4 MPa,反應(yīng)空速為8000 h-1時,其催化活性最好,催化反應(yīng)的CO2選擇性較低,較好的抑制了CO甲烷化中的水煤氣變換反應(yīng)。
[Abstract]:Because of its excellent physical and chemical properties, CNTshas been widely used in field emission, energy battery and other fields. CNTsis also a kind of excellent catalyst carrier material. The methanation reaction is an important process of converting syngas to methane. The catalyst used in the process is very important for the methanation reaction; nickel is a resource-rich metal element. It is also an excellent catalyst for methanation. Therefore, carbon nanotubes (CNTs) are used as carriers to support nickel metal, and the structure and catalytic properties of Ni/CNTs catalysts prepared by different processes are systematically studied. The main conclusions are as follows: electroless plating method, hydrothermal method. Ni/CNTs catalysts were prepared by precipitation method and impregnation method. The feasibility of the preparation process and the dispersion and average particle size of nickel particles in the prepared carbon nanotube supported metal nickel catalyst were considered. It is considered that it is of practical significance to prepare Ni/CNTs by impregnation. (2) the process of preparing Ni/CNTs by impregnation is investigated systematically. It is found that the pretreatment process of CNTs and the selection of nickel precursor. The impregnation process and heat treatment process have great influence on the catalytic performance of Ni/CNTs. The optimum conditions for the preparation of Ni/CNTs are as follows: pretreatment of carbon nanotubes with 50 wt.% nitric acid refluxing, nickel precursor selection of nickel acetate or acetylacetone nickel, The impregnation time is 24 hours to 36 hours, the drying process is 40 鈩，

本文編號：1863989