您当前的位置:首页 > TAG信息列表 > 乔波涛

Ionic Liquids 英超联赛直播液体

★ 版权申明

部分内容搜集自网络,如有侵权,敬请及时联系我们,我们将第一时间予以删除或作相应处理。

文件名称
作者
文件大小
下载地址

本发明公开了一种环境友好的担载金催化剂制备方法。该方法将载体铁盐溶液与金盐溶液混合均匀,在20~80℃、搅拌下用碳酸钠作为沉淀剂进行沉淀,调节最 终pH值为7~10,继续搅拌1.5~4小时,静置2.5~6小时,过滤,20~80℃干燥4~24小时。不需洗涤,不需焙烧。该方法的主要特点是催化剂 制备操作简单,节水节能,环境友好,催化剂抗Cl-毒害能力强。

邓友全,乔波涛,李雪礼. 环境友好的担载金催化剂制备方法. Cn1795985. 2007.

A novel Au&Pd/Fe(OH)x catalyst with separate Au and Pd active sites was designed and synthesized. It was found for the first time that total conversion of CO + H2 could be achieved at room temperature over this catalyst. The separate Au and Pd sites in Au&Pd/Fe(OH)x catalyst were confirmed by the XPS, XRD, 197Au MÖssbauer characterizations and the activity measurements, although a small amount of Au–Pd alloy formed after the catalyst was calcined at 500 ℃.

Keywords: Gold; Palladium; Bimetal; Separate active sites; Co-oxidation

★★★☆☆ Qiao BT,Wang AQ,Masashi Takahashi,et al. A Novel Au&pd/fe(oh)x Catalyst For Co + H2 Co-oxidations At Low Temperatures[J]. Journal Of Catalysis,2011,279:361-365.

Ferric hydroxide supported Pd catalyst prepared by a simple co-precipitation method without calcinations at elevated temperatures and only reduced at 50◦C possessed unexpectedly higher activity for CO oxidations even compared with that of supported Au catalysts. XRD and TEM results showed that the support was mixture of Fe(OH)x and Fe3 O4 and Pd was highly dispersed on it. XPS results showed that Pd existed as mixture of oxidation and metal state. The large amount of OH group on the supports may play an important role in O adsorption and activation.

Keywords: Gold; Palladium; CO oxidations; Ferric hydroxide; Low temperature

★★★☆☆ Qiao BT,Liu LQ,Zhang J,et al. Preparation Of Highly Effective Ferric Hydroxide Supported Noble Metal Catalysts For Co Oxidations: From Gold To Palladium[J]. Journal Of Catalysis,2009,261:241-244.

Ferric hydroxide supported Au catalysts prepared with co-precipitation method at room temperature without any heat treatment hereafter exhibited high catalytic activity and selectivity for CO oxidation in air and CO selective oxidation in the presence of H2. With calcination temperature rising, both activity and selectivity decreased. X-ray Photoelectron Spectra (XPS) indicated that Au existed as Au0 and Au+ in the catalyst without heat treatment and even after being calcined at 200 ℃, while after being calcined at 400 ℃, Au existed as Au0 completely. X-ray Diffraction (XRD) and High Resolution Transmission Electron Microscopic (HRTEM) investigations indicated that both the supports and Au species were highly dispersed as nano or sub-nano particles even after being calcined at 200 ℃, but after being calcined at 400 ℃ the supports transformed to crystal Fe2O3 with typical diameter of 30 nm and Au species aggregated to nano-particles with typical diameter of 2–4 nm. HRTEM investigations also suggested that the supports calcined at 200 ℃ were composed of amorphous ferric hydroxide and crystal ferric oxide. Results of computer simulation (CS) showed that O2 was adsorbed on Au crystal cell and then were activated, which should be the key factor for the subsequent reaction. It also suggested that O2 species were more easily adsorbed on Au+ than on Au0, indicating that higher positive charge of the Au species possessed the higher activity for CO oxidation.

Keywords: Gold catalyst; CO selective oxidation; Preparation; Uncalcined; Low-temperature

★★★☆☆ Qiao BT,Zhang J,Liu LQ,et al. Low-temperature Prepared Highly Effective Ferric Hydroxide Supported Gold Catalysts For Carbon Monoxide Selective Oxidation In The Presence Of Hydrogen[J]. Applied Catalysis A: General,2008,340:220-228.

Supported Au catalysts Au-Au+-Clx/Fe(OH)y (x<4, y≤3) and Au-Clx/Fe2O3 prepared with co-precipitation without any washing to remove Cl- and without calcining or calcined at 400 ℃ were studied. It was found that the presence of Cl had little impact on the activity over the unwashed and uncalcined catalysts; however, the activity for CO oxidation would be greatly reduced only after Au-Au+-Clx/Fe(OH)y was further calcined at elevated temperatures, such as 400 8C. XPS investigation showed that Au in catalyst without calcining was composed of Au and Au+, while after calcined at 400 8C it reduced to Au0 completely. It also showed that catalysts precipitated at 70 8C could form more Au+ species than that precipitated at room temperatures. Results of XRD and TEM characterizations indicated that without calcining not only the Au nano-particles but also the supports were highly dispersed, while calcined at 400 8C, the Au nano-particles aggregated and the supports changed to lump sinter. Results of UV–vis observation showed that the Fe(NO3)3 and HAuCl4 hydrolyzed partially to form Fe(OH)3 and [AuClx(OH)4 x] (x = 1–3), respectively, at 70 ℃, and such pre-partially hydrolyzed iron and gold species and the possible interaction between them during the hydrolysis may be favorable for the formation of more active precursor and to avoid the formation of Au–Cl bonds. Results of computer simulation showed that the reaction molecular of CO or O2 were more easily adsorbed on Au+ and Au0, but was very difficultly absorbed on Au . It also indicated that when Cl- was adsorbed on Au0, the Au atom would mostly take a negative electric charge, which would restrain the adsorption of the reaction molecular severely and restrain the subsequent reactions while when Cl was adsorbed on Au+ there only a little of the Au atom take negative electric charge, which resulting a little impact on the activity.

Keywords: Gold catalyst; CO oxidation; Green chemistry; Preparation; Uncalcined; Unwashed

★★★☆☆ Qiao BT,Deng YQ. Effective Au-au+-clx/fe(oh)y Catalysts Containing Cl- For Selective Co Oxidations At Lower Temperatures[J]. Applied Catalysis B: Environmental,2006,66:241-248.

Ferric hydroxide supported Au prepared with co-precipitation without heat treatment could be a very effective catalyst for selective CO oxidation in the presence of H2 at lower temperatures.

★★★★☆ Botao Qiao and Youquan Deng. CHEM. COMMUN. , 2003, 2192–2193.