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Preparation Of Meso-Hangjin 2~# Clay Supported Ni O_x、CuO_x And Studies On Their Photo-catalytic Performance For Hydroxylation Of Benzene To Phenol

Posted on:2016-02-08Degree:MasterType:Thesis
Country:ChinaCandidate:X WangFull Text:PDF
GTID:2271330464466339Subject:Physical chemistry
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Human used phenol at the beginning of 20 th century. Before this, human extract phenol from coal tar. Later the researchers developed methods of isopropyl benzene, toluene benzoic acid method, sulfonated method, hydrolysis of chlorobenzene to produce phenol, along with the progress of science and technology and the deepening of the research. Currently 90% of phenol in the world is through the production of isopropyl benzene method, but this method has many disadvantages, including it has a lot of reaction steps, it is hard to control the cost and it consumes a lot of strategic scarce resources propylene at the same time, it does create the market demand is very small-acetone and it is not conform to the thought of sustainable development. Phenol can be through the direct hydroxylation of benzene to manufacturing. It has many advantages, including it has a high atom economy, its byproduct is water, so there are more and more researchers pay attention to it. Photocatalysts have many advantages, for example, its catalytic performance is good at room temperature and maybe can make use of the sun. Photocatalysis hydroxylation of benzene to phenol has attracted researchers attention, it becomes a research focus in recent years.In this paper, firstly we used an abundant hangjin 2# clay in Inner Mongolia as raw material and prepared mesoporous hangjin 2# clay by organic modification treatment used as catalyst carrier. We used the deposition-precipitation method, load nickel oxide onto mesoporous hanggin 2# clay and preparation of NiOx/ mesoporous hanggin 2# clay catalyst, and used hydroxylation of benzene to phenol of the probe reaction, under the effect of 300 W mercury vapor lamp,under the optimized conditions,the 60% of benzene conversion and 93% of phenol selectivity were obtained.Secondly, we chose copper oxide as active component, used the deposition-precipitation method, load copper oxide onto mesoporous hanggin 2# clay. We used CuOx/ mesoporous hanggin 2# clay as catalyst and used 500 W halogen lamp as light source, reached for light absorption in the visible area. Under the optimized conditions,the 62.9% of benzene conversion and 96.2% of phenol selectivity were obtained. But we couldn’t reuse the catalyst, because the loss of catalyst active component is more serious. In order to solve this problem, we use one-step method to prepare CuOx/mesoporous hanggin 2# clay, under the optimized conditions, the 27.9% of benzene conversion and 91.9% of phenol selectivity were obtained. Catalyst is still active after the repeat three times. The catalysts were characterized by XRD, TEM, UV-Vis, XPS, N2 adsorption-desorption etc..
Keywords/Search Tags:benzene, hydroxylation, phenol, visible catalyst
PDF Full Text Request
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