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双氧水-氨水氧化浸出废Mo-Ni/Al_(2)O_(3)型加氢催化剂中的钼
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作者 赵歌 张广积 +4 位作者 梁杰 沈蔡龙 吕岳奋 陈彦臻 杨超 《稀有金属与硬质合金》 CAS CSCD 北大核心 2023年第6期16-22,共7页
针对废镍钼加氢催化剂提出了一种双氧水结合氨水氧化浸出工艺,选择性浸出其中的钼。通过实验研究了双氧水用量、浸出温度、浸出时间对钼浸出率的影响,并对浸出渣进行了SEM、EDS、XRD表征。结果表明:在滴加氨水维持反应体系pH为8~9、双... 针对废镍钼加氢催化剂提出了一种双氧水结合氨水氧化浸出工艺,选择性浸出其中的钼。通过实验研究了双氧水用量、浸出温度、浸出时间对钼浸出率的影响,并对浸出渣进行了SEM、EDS、XRD表征。结果表明:在滴加氨水维持反应体系pH为8~9、双氧水用量为2.0倍理论量、浸出温度为80℃、浸出时间为120min、搅拌速度为250r/min条件下,Mo浸出率可达到97%以上,同时Al和Ni的溶解率维持在较低水平。 展开更多
关键词 废加氢催化剂 双氧水 氨水 氧化浸出
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Heterogeneous interfacial engineering of Pd/TiO2 with controllable carbon content for improved direct synthesis efficiency of H2O2 被引量:3
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作者 Wei Yan Rui Sun +5 位作者 Meng Li Licheng Li Zhuhong Yang Zelin Hua Xiaohua Lu Chang Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第2期312-321,共10页
Series of heterogeneous interfacial engineered TiO2(C-TiO2) with controllable carbon content were facilely synthesized by incipient-wet impregnation using glucose and subsequent thermal carbonization. The obtained C-T... Series of heterogeneous interfacial engineered TiO2(C-TiO2) with controllable carbon content were facilely synthesized by incipient-wet impregnation using glucose and subsequent thermal carbonization. The obtained C-TiO2 were used as catalytic supports to load Pd nanoparticles for H2 O2 direct synthesis from H2 and O2. The as-prepared samples were systematically studied by transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), air isothermal microcalorimeter, temperature-programmed reduction of H2(H2-TPR), and so on. The catalytic results showed that H2 O2 productivity and H2O2 selectivity of Pd/C-TiO2 firstly rose with increasing carbon content and then declined. Pd/C-TiO2 catalyst with 1.89 wt% of carbon content showed the best catalytic performance that had 61.2% of selectivity and 2192 mmol H2O2/g Pd/h of productivity, which were significantly better than those of pristine Pd/TiO2(45.2% and 1827 mmol H2O2/g Pd/h). Various characterization results displayed that the carbon species were heterogeneously dispersed on TiO2 surface. Moreover, no obvious geometric transformation in supports and Pd nanoparticles were observed among different catalysts. The superficial hydrophobicity of Pd/C-TiO2 was gradually promoted with increasing carbon content, which led to the corresponding decrease in adsorption energy of H2O2 with catalysts. According to structure-performance relationship analyses, the heterogeneous interfacial engineering of carbon could maintain the interaction of Pd nanoparticles with TiO2 and simultaneously accelerate the H2O2 desorption. Both factors further determined the excellent H2O2 direct synthesis performance of Pd/C-TiO2. 展开更多
关键词 Direct synthesis of H2O2 TiO2 CARBON Heterogeneous interfacial engineering PD
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