Preparation of magnetic zeolite/chitosan composite using silane as modifier for adsorption of Cr(VI) from aqueous solutions

This study aimed to prepare an efficient, cost-effective, and separable magnetic zeolite/chitosan composite (MZFA/CS) adsorbent from solid waste to deal with the water pollution of Cr(VI). The MZFA/CS was characterized by X-ray fluorescence (XRF), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and vibrating sample magnetometer (VSM) techniques. Then, the effect of pH, temperature, initial concentration of Cr(VI) ions, and contact time was considered in the study. For a sorbent dose of 0.1 g in 50 mL of a Cr(VI) solution, at a contact time of 30 min, temperature of 30°C, and a pH of 3, an adsorption capacity (q_e) of 16.96 mg g⁻¹ was achieved. Adsorption kinetics and isotherm data obtained for all adsorption systems were well-fitted by pseudo-second-order and Langmuir models, respectively. The thermodynamic study suggested that the adsorption process is spontaneous and endothermic in nature. In summary, the adsorbent with better separability (Ms = 16.83 emu g⁻¹) and adsorbability was successfully fabricated.     

不锈钢网负载Al-beta分子筛涂层的制备及其在油水分离中的应用

使用二次生长法在不锈钢网表面制备了Al-beta分子筛涂层，并通过扫描电镜、X射线衍射和接触角检测对其进行了表征。Al-beta分子筛晶粒以球形呈现在不锈钢网表面，并相互交联而构成微纳双级粗糙结构，Al-beta涂层表现出超亲水和水中超疏油性质。将不锈钢网负载Al-beta分子筛涂层用于分离一系列油水混合物，并考察了其耐久性和稳定性。实验结果表明，不锈钢网负载Al-beta分子筛涂层在重复使用100次后其正己烷/水分离效率仍保持在97.1%以上，酸、碱和超声等处理对其形貌和油水分离效率几乎没有影响，具备优异的耐久性、自清洁性和稳定性，在实际油水分离过程中有很大应用潜力。     

Fe/ZSM-5催化剂的酸性与孔隙特性对合成气直接制备芳烃的影响

以多级孔ZSM-5分子筛为载体，通过等体积浸渍法制备了一种双功能铁基催化剂，用于合成气直接制备芳烃。采用硅烷法合成不同硅铝比和介孔孔隙率的多级孔ZSM-5分子筛载体。催化剂的理化性质通过XRD、XRF、BET和HN₃-TPD进行表征。结果表明：具有较高酸性的分子筛有利于提高油相中芳烃的选择性，当载体的硅铝比为40时，在油相中芳烃选择性可达66.9%；通过调节硅烷剂3-氨丙基三甲氧基硅烷（3-APTMS）的加入量来控制分子筛的介孔孔隙率，可使碳氢产物中芳烃的收率大幅度提高。     

闲置加氢装置升级改造为C5/C6异构化装置技术及工业应用

采用中国石化石油化工科学研究院开发的中温异构化技术将中油东明石化集团闲置的0.25 Mt/a柴油加氢装置升级改造为C5/C6异构化装置，以连续重整装置的拔头油、戊烷油和抽余油为原料，根据“利旧最大化、投资最低以及异构化原料全部加工”的改造原则，采用脱C7+技术和“脱异戊烷 ＋ 一次通过”异构化工艺流程，可生产研究法辛烷值为79.7的C5/C6异构化汽油。标定结果表明：异构化催化剂的C5异构化率为63.2%，C6异构化率为81.1%，异构化产品的研究法辛烷值达到79.7，异构化产品收率为98.0%，各项数据均达到技术控制指标。     

ZSM-5沸石膜用于生物油的脱水分离及其再生过程研究

在水热条件下通过无模板剂法合成了连续的ZSM-5沸石膜，并将其用于生物油的渗透汽化以进行高效脱水分离。ZSM-5沸石膜在强酸性、多组分的生物油体系中保持了很好的化学稳定性和优异的分离选择性，但在分离过程中面临着较强的膜污染问题，导致了膜通量的大幅下降。ZSM-5沸石膜的再生研究表明，膜的渗透通量随着再生温度的升高而逐渐提高。当再生温度为220℃时，ZSM-5沸石膜的渗透通量可以恢复至初始的88%。再生的机理研究表明，ZSM-5沸石膜中大量的晶内孔在生物油体系中极易被污染，从而导致渗透通量迅速下降；而相对较大的晶间孔却难以被完全堵塞，水分子在被污染的ZSM-5沸石膜中主要通过晶间孔进行渗透。上述结果表明，通过合理调控ZSM-5沸石膜的晶间孔的数量和尺寸大小可有效提升ZSM-5沸石膜在生物油中的渗透汽化脱水分离性能。     

5A和ZSM-5分子筛吸附分离石脑油中烷烃组分的研究

为了提高石脑油生产乙烯和芳烃的利用效率，采用5A分子筛和ZSM-5分子筛对石脑油进行连续吸附分离研究，分别得到脱正构烷烃吸余油（简称脱正构油）和脱单甲基异构吸余油（简称脱烷烃油）；采用氮气对分子筛进行脱附得到富含烷烃组分油（简称脱附油）。试验结果表明：脱烷烃油中正构烷烃质量分数为0.1%，单甲基异构烷烃质量分数为3.8%，芳烃潜含量为53.4%，可作为优质的催化重整原料；脱附油的烷烃质量分数可达到84%以上，可作为裂解制乙烯的优质原料。     

酸性及孔结构调变对IM-5分子筛催化MTP反应稳定性的影响

分别采用复合酸(氟硅酸、硫酸)、四乙基氢氧化铵(TEAOH)溶液后处理方法对母体IM 5分子筛进行酸性和孔结构调变。通过XRD、N2吸附-脱附、NH3-TPD和 29Si、27Al MAS NMR等手段表征改性IM-5分子筛的物化性能。结果发现，复合酸处理可以增加分子筛硅/铝摩尔比，且增加程度随氟硅酸质量的增加而增加；随着TEAOH处理时间的增加，分子筛的相对结晶度和孔结构参数均有一定程度提升。在反应温度480 ℃、反应压力0.1 MPa、甲醇与水质量比1/1、甲醇质量空速1.5 h-1的条件下，考察了酸性及孔结构调变IM-5分子筛的甲醇制丙烯(MTP)催化性能。结果表明，酸性调变可以将母体IM-5分子筛的寿命由3 h提高到19 h，且随着硅/铝摩尔比增加，丙烯收率不断增加，乙烯收率不断降低。而TEAOH后处理又可以继续将分子筛寿命提高至102 h，随着TEAOH处理时间增加，丙烯收率变化不明显，而乙烯收率不断增加。     

Novel core-shell-like Ni-supported hierarchical beta zeolite catalysts on bioethanol steam reforming

Hierarchical-Beta zeolites have been hydrothermally synthesized by adding a new gemini organic surfactant. The used gemini surfactant play the role of a “pore-forming agents” on the mesoscale, on the same time, providing alkaline environment for the system. With this hierarchical Beta zeolite as the core support, we successfully prepared a shell layer of Ni-containing (22 wt%) petal-like core-shell-like catalyst and applied it to bioethanol steam reforming. At the reaction temperature of 350 °C–550 °C, the conversion rate of ethanol and the selectivity of hydrogen were always above 85% and 70%. After reaction of 100 h on stream at 400 °C, there were not obvious inactivation could be observed on NiNPs/OH-MBeta catalyst.     

SBA-15固载磷钨酸催化剂的制备及催化合成叔丁基苯酚

以不同硅烷偶联剂改性的介孔分子筛SBA-15为载体、PW_(12)为催化剂,通过对SBA-15表面共价及非共价修饰制备磷钨酸@介孔分子筛/硅烷偶联剂复合催化剂PW_(12)@SBA-15/YSiX_3(YSiX_3=Apts、Atapts、Papts);并利用FT-IR、XRD、TEM、N_2吸附-脱附对其组成、结构及形貌进行表征。以改性SBA-15分子筛固载磷钨酸催化剂催化合成叔丁基苯酚为研究对象,考察不同硅烷偶联剂、反应温度、苯酚与叔丁醇物质的量比对催化合成叔丁基苯酚的影响,并获得合成叔丁基苯酚的最佳工艺条件,即反应温度145℃、n(苯酚)∶n(叔丁醇)=1∶2.5、重时空速2.2 h~(-1),该最佳反应条件下,PW_(12)@SBA-15/Apts催化剂催化合成叔丁基苯酚的催化活性最高,苯酚转化率为98.3%,2,4-二叔丁基苯酚选择性为57.3%.     

Enhanced compactness of oriented MFI zeolite films by heat treatment of seed layer

The achievement of compact and defect-free film structure is crucial for the application of b-oriented MFI zeolite film. In this work, a novel heat treatment technique was used to treat zeolite seeded substrates prior to secondary growth. The influence of the heat treatment parameters such as treat temperature and time on the final film morphology were systematically investigated. The relationship between film compactness and the parameters was established. Under the optimized treat temperature of 120?°C and treat time of 1?h, compact and uniform b-oriented MFI zeolite film was achieved. The applicability of the optimum heat treatment condition was validated by employing various film substrates.