本文選題：苯酚 + 加氫��； 參考：《昆明理工大學》2016年碩士論文

【摘要】：隨著經(jīng)濟社會的不斷發(fā)展進步,能源的地位也日益重要。其中,化石能源在能源的使用中占據(jù)著主導地位。但是伴隨著化石能源的使用還將產(chǎn)生大量的污染物,對環(huán)境造成不良的影響。隨著化石燃料對環(huán)境的影響日益加劇,人們的注意力逐步集中在尋找一種合適的、環(huán)境友好的、可再生的能源,以取代化石能源在經(jīng)濟社會發(fā)展中的作用在生物質(zhì)能源是研究中面臨的主要問題是生物柴油含氧量高、H/C比低,造成這個現(xiàn)象最主要的原因是芳香族化合物的存在以及其難以降解的特性。本研究在實驗室之前研究的基礎上,選取了苯酚作為模型化合物,探究其了在高溫熱水(high-temperature water,HTW)系統(tǒng)中苯酚催化加氫。實驗過程中對催化劑進行了BET、XRD、XPS、TEM和STEM-ED S表征。表征結(jié)果表明制備的磷鎢酸改性的Pd/Ce-AlOx催化劑(Pd/W-Ce-AlOx)不僅能夠提高主要元素的結(jié)合能來提高催化劑的吸電子能力,還能提高苯酚在HTW系統(tǒng)中的加氫效率和選擇性。在HTW系統(tǒng)中使用Pd/W-Ce-AlOx催化苯酚加氫反應,當溫度較低(180℃)時,反應過程中苯酚的降解率和對環(huán)己酮的選擇性都很高,環(huán)己酮為主要產(chǎn)物且選擇性超過95%。然而,當反應溫度升高并超過260℃時,水的傳質(zhì)特性的變化使環(huán)己酮從催化劑的酸性位點上離開,導致環(huán)己酮發(fā)生進一步加氫反應生成環(huán)己醇甚至是環(huán)己烷。根據(jù)實驗結(jié)果,還建立了苯酚在Pd/W-Ce-AlOx催化下發(fā)生加氫反應的動力學模型。
[Abstract]:With the development of economy and society, the status of energy is becoming more and more important. Among them, fossil energy plays a leading role in the use of energy. However, the use of fossil energy will also produce a large number of pollutants, which has a negative impact on the environment. With the increasing impact of fossil fuels on the environment, attention is gradually being focused on finding a suitable, environmentally friendly, renewable energy source. In order to replace the role of fossil energy in the economic and social development of biomass energy is the main problem in the study is the high oxygen content of biodiesel low H / C ratio. The main cause of this phenomenon is the presence of aromatic compounds and their difficult to degrade. Based on the pre-laboratory study, phenol was selected as a model compound to investigate the catalytic hydrogenation of phenol in the high-temperature hot water system. The catalyst was characterized by TEM and STEM-ED. The characterization results show that the modified PD / W-Ce-AlOx catalyst (PD / W-Ce-AlOx) can not only increase the binding energy of the main elements to improve the electron absorption ability of the catalyst, but also improve the hydrogenation efficiency and selectivity of phenol in the HTW system. In the HTW system, PD / W-Ce-AlOx was used to catalyze the hydrogenation of phenol. When the temperature was low (180 鈩，

本文編號：2074706