HPWA/SBA-15催化合成2-叔丁基对甲酚

以SBA-15负栽磷钨酸(HPWA)为催化剂,甲基叔丁基醚(MTBE)和对甲酚为原料,在小型固定床反应器上进行了合成2-叔丁基对甲酚的试验研究,试验考察了HPWA负载量、反应温度、反应空速及原料配比对反应转化率、选择性的影响.试验结果表明,经HPWA改性后SBA-15的酸性增强,对甲酚转化率增大.适宜的反应条件为,反应温度160 ℃,HPWA负载量40%,空速3.0 h-1,原料MTBE和甲酚摩尔比为1.5.在适宜的条件下,对甲酚的转化率65.87%,2-叔丁基对甲酚的选择性97.81%.     

Green Synthesis for MCM-41 and SBA-15 Silica Using the Waste Mother Liquor

Silicon - In an attempt to synthesize silicas with respect to green chemistry, the synthesis of MCM-41 and SBA-15 silicas by a low-cost approach through the recycling of waste mother liquors was...     

苯并咪唑衍生物的合成及表征

氧气作为氧化剂,邻苯二胺与芳醛为原料,甲醇为溶剂,反应合成了2种苯并咪唑类衍生物：2-（4-甲基苯基）苯并咪唑,2-（4-溴苯基）苯并咪唑,应用傅里叶红外光谱仪、核磁共振仪和元素分析仪分析和表征了目标化合物的结构。     

氯苯基类苯并咪唑衍生物的合成

在多聚磷酸与磷酸混合酸的催化条件下 ,利用 2 ,4 二氯苯氧乙酸和邻氯苯甲酸与邻苯二胺的缩合反应 ,合成了 2 (2 ,4 二氯苯氧甲基 )苯并咪唑和 2 (o 氯苯基 )苯并咪唑两种化合物 ,反应物质的量比n(有机酸 )∶n(邻苯二胺 ) =1∶1,反应时间为 6h ,收率分别为 73 7%和 6 2 0 % ,产品质量分数分别为 98 0 %和 98 6 %。最适宜的条件是 :催化剂中多聚磷酸与磷酸的体积比为 1∶4 ,反应温度为 190～ 2 0 0℃     

P/SBA-15催化合成十六烷基苯

采用负载磷酸的SBA-15分子筛作为催化剂,以苯和十六碳烯为原料,经烷基化反应合成十六烷基苯。在微型液相固定床反应器上考察了反应温度、空速、体系压力、磷酸负载量以及苯烯摩尔比等反应条件对催化剂性能的影响。研究结果表明,磷酸的适宜负载量约为7%(质量分数),适宜反应条件为反应温度180℃、空速为2.0 h-1、体系压力为2.0 MPa和苯、烯摩尔比为10。在此条件下,十六碳烯的转化率可达到94.5%,十六烷基苯选择性可达93%。催化剂单程寿命达到120 h以上。负载磷酸的SBA-15催化剂呈现较好的催化活性和稳定性。     

SBA-15 Supported Dendritic ILs as a Green Catalysts for Synthesis of 2-Imidazolidinone from Ethylenediamine and Carbon Dioxide

Catalysis Letters - In this work, a simple and facile approach is conducted for preparing many new SBA-15 supported dendritic imidazolium ILs heterogeneous catalysts SBA-15/IL(1–3) having...     

N-吡唑酰基苯并咪唑衍生物的合成研究

设计合成了5个未见文献报道的N-吡唑酰基苯并咪唑类化合物,其结构经元素分析、1HNMR、IR确证.     

SBA-15负载杂多化合物在苹果酯合成中的催化性能

用浸渍法制备了一系列中孔二氧化硅分子筛SBA-15负载的磷钨酸(PW)及其铯盐和钾盐催化剂,考察了其在乙酰乙酸乙酯与乙二醇缩合制苹果酯反应中的催化性能, 并以N2吸附,Hammett指示剂和FT-IR等手段表征了催化剂的物化性质, 在水处理试验中考察了催化剂的稳定性,溶脱到水中的杂多化合物浓度用紫外可见分光光度仪测定.结果表明,在合成苹果酯的反应中,当PW的负载量低于30%,杂多酸盐负载量低于20%时,固体催化剂无活性;催化剂在反复使用过程中活性下降的量与活性组分在极性体系中的溶脱量成对应关系,说明催化剂活性下降的主要原因是杂多酸(盐)活性组分的流失造成的,而负载磷钨酸铯盐良好的催化稳定性来源于磷钨酸铯盐的难溶脱性.     

SBA-15 Supported Silver Catalyst for the Efficient Aerobic Oxidation of Toluene Under Solvent-Free Conditions

The efficient SBA-15 supported silver catalysts(Ag/SBA-15) were prepared and characterized by ICP-OES, XRD, TEM, SEM, XPS and N₂ adsorption–desorption techniques. The catalysts exhibited an excellent catalytic activity for the aerobic oxidation of toluene to benzaldehyde under solvent-free conditions. Conversion of toluene and selectivity of benzaldehyde were 50% and 89% respectively over catalyst with 9.1 wt% Ag loading (10Ag/SBA-15). A wide range of substrates were tolerated under the selected reaction conditions. The kinetic study shows that the oxidation of toluene over 10Ag/SBA-15 is pseudo-first-order reaction and the activation energy E_a is 45.1 kJ/mol. A plausible mechanism involving oxygen free radicals was proposed for the aerobic oxidation reaction. Compared with the traditional method, the newly designed heterogeneous catalytic system shows better economic applicability, environmental friendliness and broader application prospects.

Graphical abstract

     

苯并咪唑衍生物的合成研究

以邻苯二胺与醛为原料,采用盐酸作催化剂,空气为氧化剂,乙醇作溶剂,合成苯并咪唑衍生物,发现芳醛上带有吸电子基时则能够较好地得到目标产物,而芳醛上带有供电子取代基时,反应产物大多为双Schiff碱副产物。其中5个化合物为新化合物,产物结构经1H NMR确证。     

Oxidation of Carbon Monoxide Over SBA-15-Confined Copper,Palladium and Iridium Nanocatalysts

Abstract  

Copper, palladium and iridium nanoparticles were synthesised within the pore channels of selectively grafted mesoporous silica SBA-15. The support and catalysts were characterised by different techniques. The synthesized catalyst were able to catalyse oxidation of carbon monoxide with activity values as high as 7.0 × 10⁻³ mmol g⁻¹ cat s⁻¹ at 353 K. Carbon monoxide conversion was found to increase with decreasing nano particle size.     

Fe、Cu共掺杂SBA-15介孔氧化硅的绿色合成及其表征

利用紫外光引发过硫酸钠产生的羟基自由基替代无机强酸,在中性条件下水解正硅酸四乙酯,一步绿色合成了铜、铁共掺杂的SBA-15有序介孔二氧化硅材料。采用XRD、SEM、TEM、EDS能谱以及物理吸附（N2）等表征手段对所得介孔二氧化硅材料进行了系统表征分析。结果表明：成功合成了纤维状的Fe、Cu共掺杂SBA-15介孔氧化硅材料,该材料呈现出有序的介孔结构,其中Fe∶Cu∶Si原子比约为1∶3∶58;随着Fe、Cu掺杂量增加,Fe-Cu-SBA-15介孔氧化硅材料的比表面积先增大后减小,介孔孔径逐渐减小。     

含氟、硝基苯并咪唑衍生物的合成及抗病毒活性

在碱性条件下由2-(4’-羟苯基)-5-取代苯并咪唑与氯乙酸作用得到5个新化合物取代苯并咪唑基苯氧乙酸。使其在4-二甲氨基吡啶催化下与溴代乙酰糖酯化合成了3个新化合物-含氟、硝基苯并咪唑苯氧乙酸糖酯。经IR、MS、^1HNMR确认了这8个新化合物的结构及酯类化合物的构型。试验结果表明，含氟、硝基苯并咪唑苯氧乙酸糖酯较取代苯并咪唑基苯氧乙酸具有更高的抗炯草花叶病毒(TMV)的活性。     

Mesoporous Silica SBA-15 Supported Co3O4 Nanorods as Efficient Liquid Phase Oxidative Catalysts

Mesoporous silica SBA-15 supported cobalt oxide composites prepared via the ??double-solvent??, impregnation and adsorption techniques were characterized by diffuse reflectance UV?CVis (DR UV?CVis), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The potential of these cobalt modified composites to oxidize norbornene, benzyl alcohol and 1-phenylethanol was determined by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). SEM images indicated that, irrespective of cobalt content (Co-content), the integrity of the mesoporous channels remained intact for all methods. DR UV?CVis exhibited a red-shift which increased with Co-content for catalysts prepared by the double-solvent technique and is attributed to more extensive crystal growth. The morphology of the cobalt oxide species had a direct impact on the pore volume (Pv) and surface area (SA) of the composites and this, in turn affected the catalytic activity. For catalysts prepared by the double-solvent technique, the activity was in reverse proportion to the Co-content. This is attributed to reduced Pv which limits the active SA available.     

苯并咪唑衍生物的微波合成、表征及其抑菌活性

在微波辐射下分别用对甲氧基苯甲醛、对羟基苯甲醛和邻苯二胺反应直接关环合成了1-(对甲氧基苄基)-2-(对甲氧基苯基)-苯并咪唑、1-(对羟基苄基)-2-(对羟基苯基)-苯并咪唑化合物.通过数字熔点仪、元素分析、红外光谱分析、核磁分析对产品进行了表征,并对这两种苯并咪唑衍生物的抑菌活性进行了研究。