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高纯(纳米型)聚合铝及其系列絮凝剂产业化制备与应用技术
高纯 纳米型 聚合铝 絮凝剂
2023/8/19
适用范围 用于城镇饮水、工业用水,以及各种工业废水,城市污水处理与回用工程等预处理环节,以及油田水回注工程和污泥处置过程。 主要技术指标和参数 一、基本原理 聚合氯化铝絮凝剂实际是在人工控制条件下,铝盐水解聚合－凝胶沉淀化学反应过程的动力学中间产物。其形态结构特征取决于铝水解聚合动力学与制备条件。在高碱度聚合铝溶液中,除Al2(OH)24+外,存在纳米Keggin结构[Al13O4(OH)24]7...
中国科学院生态环境研究中心的贺泓研究组在开发新型NH3-SCR催化剂体系方面开展了大量的研究工作。目前,他们成功开发出了包括Ce/TiO2和铁钛复合氧化物(FeTiOx)在内的两种新型无钒NH3-SCR催化剂体系,在中低温范围内(150-400℃)具有优异的NOx去除效率、N2生成选择性以及抗H2O/SO2中毒性能。 主要指标： 20%的Ce/TiO2催化剂和FeTiOx催化剂分别在250-400...
主要进行异丙醇铝水解制备高纯拟薄水铝石和高纯多孔γ-Al2O3的研究.合成路线以异丙醇铝为原料,改变反应过程中水化液组成、水化温度和水化时间,制备一系列拟薄水铝石及其焙烧产物多孔γ-Al2 O3.结果表明,水化液中异丙醇的存在会抑制无定型氢氧化铝的晶化,但也有助于形成大孔径、高比表面和大孔容的氧化铝;纯水体系下,60℃以下水化会出现三水铝石,60℃以上水化的产物则为拟薄水铝石;γ-Al2 O3孔结...
Computer-Aided Polymer Design: Integrating Group Contribution and Molecular Dynamics
Polymer Design Integrating Group Contribution Molecular Dynamics
2023/6/19
Polymers are widely used to manufacture many chemical products. Often, polymers are designed by trial-and-error, which is expensive and time-consuming. In this work, a new optimization-based computer-...
Optimization of shale gas sweetening process coupling with claus process based on energy synthesis
gas sweetening claus process energy synthesis
2023/6/19
As a sort of emerging unconventional energy, shale gas has extensive market outlook by virtue of its enormous reserves, and concerns for shale gas exploitation and processing have been raised nowadays...
将可见光催化、不对称合成、分子氧氧化和连续化集成,创新性地用玻璃微通道反应器实现可见光活化分子氧氧化的β-酮酸酯类化合物的不对称α-羟基化反应的连续工艺.用金鸡纳碱衍生的相转移有机催化剂在气-液-液多相体系内实现可见光催化,分子氧不对称氧化连续反应.在心形微通道反应器内,1-茚酮-2-甲酸金刚酯底物完全氧化为(S)-2-羟基-1-茚酮-2-甲酸金刚酯,产物收率95%,对映选择性87.0%.与间歇反...
Highly selective production of renewable p-xylene from bio-based2,5-dimethylfuran and ethylene over Al-modified H-Beta zeolites
p-xylene ethylene Al-modified H-Beta zeolites
2023/6/19
Highly selective synthesis of renewable p-xylene (PX) from bio-based 2,5-dimethylfuran (DMF) and ethylene was successfully realized on H-Beta zeolite catalysts with further Al-modifications. The influ...
Post-modification of desilicated MFI zeolites by phosphorous promoter
Desilicated zeolites Acidity tailoring Phosphorous modification Glycerol dehydration
2023/6/19
Developments in microporous zeolites-base catalysts have evidenced the necessity of acidity tailoring in order to meet the exact requirements of specific reactions, which can be achieved by the post-m...
Pyrolysis behaviors of coal-related model compounds catalyzed by pyrite
Pyrite Catalytic pyrolysis Coal-related model compounds Tetrahydronaphthalene
2023/6/19
The pyrolysis behaviors of coal-related model compounds (bibenzyl and benzyloxybenzene) were investigated on a fixed-bed reactor catalyzed by pyrite (main component is FeS2). The pyrolysis products we...
草酸溶液处理对SAPO-34分子筛物性和催化性能的影响
SAPO-34 分子筛 草酸溶液 MTO反应
2023/6/19
用XRD、SEM、N2物理吸附、XRF、ICP-AES以及NH3-TPD、FT-IR、固体NMR和固定床甲醇制烯烃技术(MTO)反应评价等表征手段,研究了草酸溶液处理对SAPO-34分子筛的改性作用.结果表明,用草酸溶液对SAPO-34分子筛进行后处理可以通过刻蚀骨架在晶体中产生大孔,调变孔道结构,改善微孔扩散性能;选择性地降低分子筛的骨架硅含量,从而降低分子筛的酸强度和酸中心密度.将改性前后的分...
Desulfurization of 2-phenylcyclohexanethiol over transition-metal phosphides
2-Phenylcyclohexanethiol Cycloalkyl C-S bond Desulfurization Ni2P MoP WP Transition-metal phosphosulfide Piperidine
2023/6/19
The desulfurization of 2-phenylcyclohexanethiol (2-PCHT) was studied over Ni2P, MoP, and WP under 4.0 MPa H-2 or Ar at 240 degrees C. The hydrodesulfurization of 2-PCHT proceeded through three paralle...
KOH改性活性炭及其对微量乙烷的吸附性能
活性炭 KOH改性 乙烷 穿透吸附量
2023/6/19
采用KOH改性椰壳活性炭(AC)作为吸附剂,调变KOH和AC的质量比(KOH/AC,以下简称碱碳比)和活化温度制备一系列改性吸附剂,通过动态吸附法评价其脱除微量乙烷的性能,并与AC进行对比研究.评价结果表明,最佳制备条件为:KOH和吸附剂的最佳碱碳比为0.5,最佳活化温度为800℃.在该条件下制备的KOH改性AC吸附剂的乙烷穿透吸附量达到482.1 μg/g,高于AC的169.6 μg/g.表征结...
华中科技大学龚跃法教授课题组研究方向：不对称催化及合成（图）
龚跃法 课题组 不对称催化
2023/4/12
蛋白质与氨基酸是自然界最普遍存在的手性化合物，也是合成化学中最重要的手性源。从廉价的天然氨基酸出发，通过结构改造制备手性催化剂并用于不对称催化和活性分子的合成，是龚跃法教授课题组过去几年中重要的研究的方向之一。
为优化尿素水解制氨工艺中水解反应的反应速率，本文针对几种常用的尿素水解催化剂，在间歇反应系统和中试试验台上进行对比试验。结果表明：添加磷酸氢二铵或氧化铝均比无催化剂时的尿素分解率高，水解反应活化能依次为：73.6 kJ/mol、65.3 kJ/mol、52.9 kJ/mol，添加催化剂有效降低了水解反应活化能，提高了尿素的分解速率，且催化水解气相产物的各组分体积浓度与无催化时的结果一致；在140℃...
郭新闻论文成果：The template-assisted zinc ion incorporation in SAPO-34 and the enhanced ethylene selectivity in MTO reaction
SAPO-34 Metal modification MTO Product selectivity Ethylene
2023/3/6
The SAPO-34 catalyst was fine-tuned with zinc cations through a straightforward template-assisted ion incorporation (TII) process, without the necessary template pre-removal and the preparation of NH4...