共查询到20条相似文献,搜索用时 62 毫秒
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采用浸渍法以金属有机骨架Cu_3(BTC)_2负载锗钨酸(H_4GeW_(12)O_(40))制备H4Ge W_(12)O_(40)/Cu_3(BTC)_2催化剂,并用该催化剂催化芳醛、尿素和乙酰乙酸乙酯通过"一锅法"Biginelli缩合反应,以无水乙醇为溶剂,合成6种3,4-二氢嘧啶-2(1H)-酮衍生物;通过熔点的测定,IR,1H NMR和MS等对产物3,4-二氢嘧啶-2(1H)-酮衍生物进行表征。结果表明:在芳醛用量为0.04 mol,n(芳醛)∶n(乙酰乙酸乙酯)∶n(尿素)=1∶1.5∶1.5,催化剂的用量占反应物料总质量的4.0%,反应温度为90℃,反应时间为90 min的条件下,目标产物收率可达63.0%~76.3%。 相似文献
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以二苯基联苯二胺(DPB)和9-溴蒽为原料,在叔丁醇钠强碱环境下,以Pd(OAc)2/P(t-Bu)3为催化剂合成了新型空穴传输材料N,N’-二苯基-N,N’-二蒽基-1,1’-联苯-4,4’-二胺(APB)。得到优化的催化反应条件为:以二甲苯为溶剂在130~138℃回流反应3 h,Pd(OAc)2∶P(t-Bu)3=1∶1.2(摩尔比),P(t-Bu)3/9-溴蒽=0.24%;经元素分析、GC-MS、1H NMR等表征了结构;差示扫描量热仪(DSC)分析结果显示其熔点为324℃,具有良好的热稳定性。 相似文献
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负载纳米零价铁/钯(ZVI/Pd)双金属活性炭去除水中三氯乙烯(TCE)的研究 总被引:1,自引:0,他引:1
使用“初湿含浸法”将纳米级零价铁,钯(ZVI/Pd)颗粒负载于颗粒活性炭(GAC)上,考察制得的反应性活性炭(RAC)去除地下水中三氯乙烯(TCE)的有效性。研究发现,在制得的RAC中零价铁以纳米颗粒的形式负载其上,粒径范围在50~100nm之间,其负载量具有上限,一般低于30%。相比于GAC,RAC的BET比表面积有一定程度的下降。RAC上的铁成分主要以非晶态的形式存在,具有较高的分散度。通过批式试验发现,RAC能够快速有效降低水中TCE浓度,其去除动力学符合伪一级动力学模型。萃取试验和氯离子检测结果表明,RAC在吸附TCE的同时可以对其进行还原脱氯,在48h内不同RAC对于吸附其上的TCE的脱氯比例可达14.5%-30.4%。RAC对于水中TCE的去除能力短期内以吸附为主,铁含量的增加不利于其对于TCE的吸附但会有助于增加长期TCE的还原降解量。RAC在不同溶解氧环境下对TCE的去除性能优良,在短期内并没有太大区别;但若经过大量好氧(DO=6.9mg/L)的纯水浸泡,表面零价铁颗粒可能逐渐腐蚀。 相似文献
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《应用化工》2022,(3):474-477
以Pd(OAc)_2和Al(OTf)_3为催化剂,研究非氧化还原金属离子加速Pd(Ⅱ)催化丁香酚双键异构化的反应。对不同的非氧化还原金属离子进行筛选,确定选用Al(OTf)_3为非氧化还原金属离子催化剂,采用单因素结合正交实验的方法对丁香酚的双键异构化工艺进行优化。结果表明,最佳工艺条件为:反应温度50℃,反应时间6 h,n[Al(OTf)_3]∶n[Pd(OAc)_2]=2∶1,Pd(OAc)_2和Al(OTf)_3的总用量为3.45%(以丁香酚的质量分数计)。在此条件下,反应稳定性较好,产物得率可达96.3%,其中反式异丁香酚的选择性为89.5%,产品香气较为纯正。采用IR、GC-MS、和1H NMR等对产物进行了分析与表征。 相似文献
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以Pd(OAc)_2和Al(OTf)_3为催化剂,研究非氧化还原金属离子加速Pd(Ⅱ)催化丁香酚双键异构化的反应。对不同的非氧化还原金属离子进行筛选,确定选用Al(OTf)_3为非氧化还原金属离子催化剂,采用单因素结合正交实验的方法对丁香酚的双键异构化工艺进行优化。结果表明,最佳工艺条件为:反应温度50℃,反应时间6 h,n[Al(OTf)_3]∶n[Pd(OAc)_2]=2∶1,Pd(OAc)_2和Al(OTf)_3的总用量为3.45%(以丁香酚的质量分数计)。在此条件下,反应稳定性较好,产物得率可达96.3%,其中反式异丁香酚的选择性为89.5%,产品香气较为纯正。采用IR、GC-MS、和~1H NMR等对产物进行了分析与表征。 相似文献
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A.E. Alvarez 《Electrochimica acta》2010,55(11):3714-3720
The early stages of the palladium electrodeposition process onto a vitreous carbon (VC) substrate as well as the deposition of Cu on such Pd/VC modified surface were investigated using classical electrochemical techniques, atomic force microscopy (AFM) and scanning electron microscopy (SEM). Within the potential range considered the kinetics of the Pd electrodeposition from a PdCl2 acid solution can be described by a model involving progressive nucleation on active sites and diffusion-controlled 3D growth. The nucleation rate constant, A0, and the number of active sites of the substrate, N0, were determined from the analysis of potentiostatic current transients on the basis of an existing theoretical model. The AFM images corroborated the progressive nucleation mechanism showing irregular palladium crystals randomly distributed over the VC surface, with different sizes and 3D morphological characteristics. The electrodeposition of Cu was carried out onto the characterized Pd/VC modified surface from a Cu2+ containing solution using a well defined polarization routine. The SEM/EDX images confirmed the formation of Cu/Pd bimetallic crystals uniformly distributed on the VC surface and the in situ AFM images obtained during this process corroborated that Cu formed a core-shell structure with the Pd crystals. Nevertheless, the subsequent anodic stripping produced only a partial dissolution of the Cu deposits, and therefore, the formation of a Cu/Pd alloy could be inferred. 相似文献
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Daisuke Saio Toru Amaya Toshikazu Hirao 《Journal of Inorganic and Organometallic Polymers and Materials》2009,19(1):79-84
Polyaniline/Pd nanoparticles were synthesized via ligand exchange. Pre-prepared water soluble starch/Pd nanoparticles were
treated with polyaniline, and washed with water, leading to the small and well-dispersed polyaniline/Pd nanoparticles. The
redox state of polyaniline was preserved during the ligand exchange reaction.
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Toshikazu HiraoEmail: |