共查询到20条相似文献,搜索用时 62 毫秒
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采用溶胶-凝胶法在微波条件下制备Ti-MCM-41介孔分子筛,采用SEM、BET、XRD、TEM和FT-IR等对催化剂进行表征,对比MCM-41和水热合成的Ti-MCM-41介孔分子筛,并分析其制备机理,以合成的分子筛为催化剂进行柴油脱硫实验。结果表明,合成的Ti-MCM-41分子筛结构有序,晶形完整,平均孔径约4.5 nm。在每10 mL模型油Ti-MCM-41用量0.2 g、n(H2O2)∶n(苯并噻吩)=4和V(乙腈)∶V(模型油)=1条件下,苯并噻吩的催化氧化活性较高,动态氧化-萃取脱除率最高达93.5%。 相似文献
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本论文采用了一种“糖-尿素-盐”法制备了一系列Co-Mn复合氧化物催化剂,并将其应用于费托合成制烯烃,然后通过水热合成法得到了一批ZSM-5分子筛,用物理混合的方式制备了双功能催化剂,从而进一步提高α-烯烃选择性。通过一系列表征手段对所制备的材料进行表征,结合催化剂的反应性能表现等进行研究,对反应机理进行一定程度的探讨和解释,并整理总结了催化剂制备过程中的规律和结论。 相似文献
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综述了基于钛硅分子筛/过氧化氢体系的环己酮液相氨肟化绿色工艺中钛硅分子筛TS–1的研究进展,包括传统水热合成工艺的优化、新合成方法的开发和增强TS–1传质的新策略。总结了钛硅分子筛催化环己酮氨肟化的反应机理、反应路径和催化剂再生方法。并对今后钛硅分子筛催化材料的开发和研究做出展望。 相似文献
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依替米贝(Ezetimibe)是一种新型选择性胆固醇吸收抑制剂,在参考相关文献的基础上,以4-羟基苯甲醛、4-氟苯胺和氯化苄为原料一步合成得到N-(4-氟苯基)-4-苄氧基苯亚甲胺(化合物2),4-(4-氟苯甲酰基)丁酸与特戊酰氯反应成混酐后在氯化锂存在下直接和(S)-4-苯基-噁唑烷酮反应再经过CBS/BH3体系还原得到(4S)-3-[(5S)-5-(4-氟苯基)-5-羟基-1-氧代戊基]-4-苯基-2-噁唑烷酮(化合物4),经三甲基硅烷基保护羟基后直接和化合物2在TiCl2(OiPr)2催化下缩合后经三水合四丁基氟化铵催化环合和Pa/C催化氢化脱保护制得,总收率92.4%×91.6%×77.7%×85.3%=56%。最终产品和部分中间体经过熔点、MS和1H-NMR测定。该工艺路线不仅减少了关键原料的使用,提高了收率,同时也增强了有羟基保护基的中间体的稳定性,简化了反应操作,更加易于工业化。 相似文献
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GEORGE W. MOREY 《Journal of the American Ceramic Society》1953,36(9):279-285
The underlying theory of hydrothermal synthesis is presented and the apparatus used is described. By way of illustration the determination of the solubility of quartz in superheated steam at high pressures and the determination of the compositions of coexisting gas and liquid phases in the system H2 O–Na2 O–SiO2 at 400°C. are discussed. 相似文献
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Harold H. Kung 《Catalysis Reviews》2013,55(2):235-259
Abstract Methanol is a basic industrial chemical that is produced in the United States at an annual rate of over one billion gallons [1]. It is used as a solvent in many industrial processes, as a starting material for the production of other compounds, notably formaldehyde, and as a freezing point suppressing agent for gasoline lines and window washing liquids, as well as for many other purposes. Traditionally, methanol has been produced by catalytic hydrogenation of carbon monoxide. 相似文献
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Harold H. Kung 《Catalysis Reviews》1980,22(2):235-259
Methanol is a basic industrial chemical that is produced in the United States at an annual rate of over one billion gallons [1]. It is used as a solvent in many industrial processes, as a starting material for the production of other compounds, notably formaldehyde, and as a freezing point suppressing agent for gasoline lines and window washing liquids, as well as for many other purposes. Traditionally, methanol has been produced by catalytic hydrogenation of carbon monoxide. 相似文献
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(4R)-苯基恶唑烷酮乙酰氯,1,5-苯并硫氮杂zhuo、三乙胺在微波辐射下反应得标题化合物。实验表明微波辐射大大加快了反应速率和提高了反应产率。 相似文献